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1.
This paper presents an analysis of seismically isolated buildings using fiber-reinforced elastomeric structures that are subject
to excitations caused by earthquakes. In analyzing the vibrations, the buildings are modeled by lumped mass systems. The fundamental
equations of motion are derived for base isolated structures, and the hysteretic and nonlinear- elastic characteristics are
included in the numerical calculations. The earthquake waves used as the excitation forces are those that have been recorded
during strong earthquake motions in order to examine the dynamic stability of building structures. The seismic (nonlinear)
responses of the building are compared for each restoring force type and, as a result, it is shown that the building’s motions
are not so large from a seismic design standpoint. Isolating structures are shown to reduce the responses sufficiently allowing
the building’s motions to be controlled to within a practical range. By increasing the acceleration of the earthquake, the
yielding forces in the concrete and steel frames can be determined, which shows the advantages of performing nonlinear dynamic
analysis in such applications.
This paper was recommended for publication in revised form by Associate Editor Dae-Eun Kim
Gyung-Ju Kang received a B.S., M.S. and Ph.D degrees in Aerospace Engineering from Pusan National Univer-sity, Korea, in 1997, 1999 and
2005, respectively. Dr. Kang’s research interests are in the area of seismic bearing design, base isolation, cold forging,
and steel structure.
Beom-Soo Kang received a B.S. degree in Mechanical Engineering from Pusan National University, Busan, Korea in 1981. He then went on to
receive his M.S. degree in Aerospace Engineering from KAIST (Korea Advanced Institute of Science and Technology) Seoul, Korea,
in 1983 and Ph.D. degree in Mechanical Engineering from University of California at Berkeley in 1990. Dr. Kang is currently
a Professor at Department of Aero-space Engineering at Pusan National University. He is currently serving as the Director
of ILIC (Industrial Liaison Innovation Cluster). Dr. Kang’s re-search interests include flexible forming, unmanned system
design, multi-stage deep drawing, and cold forging. 相似文献
2.
Taewoo Kim Kwanjung Yee Sejong Oh Hee Jung Kang 《Journal of Mechanical Science and Technology》2009,23(1):269-280
A user-friendly, Windows-based Graphic User Interface (GUI) program that automates the generation of the aerodynamic performance
tables for comprehensive helicopter load analysis codes was developed. With this program, computational grids are automatically
created for the given airfoil surface coordinates, and users can verify the grids immediately. In addition, the program’s
post-processing feature can enable the real-time inspection of the interim results of the computation. The aerodynamic performance
tables can be generated by performing automated aerodynamic analysis of the airfoil in various angles of attack and Mach numbers
by using validated CFD code. The Mixed-Language technique was employed to combine the FORTRAN-based CFD codes to the C++-based
GUI program without needing any transformation between these two languages. The MS Access was used to construct the data base
of the aerodynamic tables. The real-time inputs of the analysis results of the ODBC Access data base make it easy to retrieve
the aerodynamic tables. Of the entire range of the angle of attack (−180° to 180°), the CFD analysis is only performed in
the significant angles depending on the Mach number. The aerodynamic data for the other angles were obtained by using an interpolation
method; therefore, the tables could be generated quickly. Various aerodynamic information such as drag divergence Mach number
and stall angle can be extracted from the computed results stored in the database.
This paper was recommended for publication in revised form by Associate Editor Yang Na
Taewoo Kim received a B.S. degree in Aerospace Engineering from Pusan National University in 2007. He is currently a M.S. candidate
at the graduate school of Aerospace Engineering at Pusan National University in Pusan, Korea. His research interests are in
the area of aerodynamics, optimization design, and helicopter aerodynamics.
Kwanjung Yee received a B.S. degree in Aerospace Engineering from Seoul National University in 1992. He then went on to receive his M.S.
and Ph.D. degrees from Seoul National University in 1992 and 1998, respectively. Dr. Yee is currently an Assistant Professor
at the Department of Aerospace Engineering in Pusan National University, Korea. His major research area covers unsteady aerodynamics,
rotorcraft flight dynamics and multidisciplinary design optimization.
Sejong Oh received his B.S. and M.S. degrees in Aerospace Engineering from Seoul National University in 1979 and 1982 respectively.
He finished his Ph.D. degrees from Stanford University in 1988. Prof. Oh is currently a Professor at Department of Aerospace
at Pusan National University in Busan, Korea. He is currently a Board Member of Korean Society of Aeronautical and Space Sciences.
Prof. Oh’s research interests are in the area of Vortex flow and Rotorcraft aerodynamics.
Hee Jung Kang received a B.S. degree in Aerospace Engineering from KAIST in 1994. He then went on to receive his M.S. and Ph.D. degrees
from KAIST in 1996 and 2001, respectively. Dr. Kang is currently a senior research engineer at Rotor Department in KARI (Korea
Aerospace Research Institute). Dr. Kang’s research interests are in the area of helicopter rotor aerodynamics, CFD (Computational
Fluid Dynamics) and simulation of fluid-structure interaction. 相似文献
3.
Dongji Xuan Zhenzhe Li Jinwan Kim Youngbae Kim 《Journal of Mechanical Science and Technology》2009,23(3):717-728
The output power efficiency of the fuel cell system mainly depends on the required current, stack temperature, air excess
ratio, hydrogen excess ratio, and inlet air humidity. Therefore, the operating conditions should be optimized to get maximum
output power efficiency. In this paper, a dynamic model for the fuel cell stack was developed, which is comprised of a mass
flow model, a gas diffusion layer model, a membrane hydration, and a stack voltage model. Experiments have been performed
to calibrate the dynamic Polymer Electrolyte Membrane Fuel Cell (PEMFC) stack model. To achieve the maximum output power and
the minimum use of hydrogen in a certain power condition, optimization was carried out using Response Surface Methodology
(RSM) based on the proposed PEMFC stack model. Using the developed method, optimal operating conditions can be effectively
selected in order to obtain minimum hydrogen consumption.
This paper was recommended for publication in revised form by Associate Editor Tong Seop Kim
Dong-Ji Xuan received his B.S. degree in Mechanical Engineering from Harbin Engineering University, China in 2000. He then received his
M.S. degree in Mechanical Engineering from Chonnam National University, South Korea in 2006. Currently, he is a Ph.D. candidate
of the Department of Mechanical Engineering, Chonnam National University, South Korea. His research interests include control
and optimization of PEM fuel cell system, dynamics and control, and mechatronics.
Zhen-Zhe Li received his B.S. degree in Mechanical Engineering from Yanbian University, China in 2002. He then received his M.S. degree
in Aerospace Engineering from Konkuk University, South Korea in 2005 and his Ph.D. degree in Mechanical Engineering from Chonnam
National University, South Korea in 2009. Dr. Li is currently a Researcher of the Department of Mechanical Engineering in
Chonnam National University, South Korea. Dr. Li’s research interests include applied heat transfer, fluid mechanics, and
optimal design of thermal and fluid systems.
Jin-Wan Kim received his B.S. degree in Aerospace Engineering from Chosun University, South Korea in 1990. He then received his M.S.
degree in Aerospace and Mechanical Engineering from Korea Aerospace University, South Korea in 2003 and his Ph.D degree in
Mechanical Engineering from Chonnam National University, South Korea in 2008. He is currently a Post Doctor of the Department
of Mechanical Engineering in Chonnam National University, South Korea. His research interests include control of hydraulic
systems, dynamics and control, and mechatronics.
Young-Bae Kim received his B.S. degree in Mechanical Design from Seoul National University, South Korea in 1980. He then received his M.S.
degree in Mechanical Engineering from the Korean Advanced Institute of Science and Technology (KAIST), South Korea in 1982
and his Ph.D. degree in Mechanical Engineering from Texas A&M University, USA in 1990. Dr. Kim is currently a Professor of
the School of Mechanical and Systems Engineering in Chonnam National University, South Korea. Dr. Kim’s research interests
include mechatronics, dynamics and control, and fuel cell hybrid electric vehicle (FCHEV) systems. 相似文献
4.
M. S. Choi D. J. Yeo J. H. Byun J. J. Suh J. K. Yang 《Journal of Mechanical Science and Technology》2009,23(2):389-400
The authors developed the transfer mass coefficient method (TMCM) in order to compute effectively the dynamic response of
a beam structure. In this paper, the algorithm for the dynamic response analysis of a three-dimensional beam structure is
formulated. Through the computation results of numerical models, which are plane and space beam structures, obtained by the
transfer mass coefficient method and the direct integration method, we verify that the transfer mass coefficient method can
remarkably decrease the computation time of the direct integration method without the loss of accuracy in spite of using small
computer storage.
This paper was recommended for publication in revised form by Associate Editor Hong Hee Yoo
Myung-Soo Choi received his B.S. and M.S. degrees from National Fisheries University of Pusan, Korea, in 1992 and 1994, respectively. He
then received his Ph.D. degree from Pukyong National University in 1999. Dr. Choi is currently an Assistant Professor at the
Department of Maritime Police Science at Chonnam National University in Yeosu, Korea. His research interests include mechanical
vibration, structural dynamics, and optimum design.
Jung-Joo Suh received his B.S., M.S. and Ph.D. degrees from National Fisheries Uni-versity of Pusan, Korea, in 1972, 1985 and 1995, respec-tively.
Dr. Suh is currently a Professor at the Faculty of Marine Technology at Chonnam National University in Yeosu, Korea. His research
interests include internal combustion engines and numerical analysis.
Dong-Jun Yeo received his B.S., M.S. and Ph.D. degrees from National Fisheries University of Pusan, Korea, in 1981, 1985 and 1996, respectively.
Dr. Yeo is currently a Professor at the Faculty of Marine Technology at Chonnam National University in Yeosu, Korea. He serves
as an Academic Director of the Korean Society for Power System Engineering. His research interests include structural dynamics,
vibration, and analytic techniques.
Jung-Kyu Yang received his B.S. degree from Pusan Fisherise College, Korea, in 1973. He then received his M.S. and Ph.D. degrees from Chungnam
National University in 1985 and 1996, respectively. Dr. Yang is currently a Professor at the Faculty of Marine Technology
at Chonnam University in Yeosu, Korea. His research interests include combustion engineering, air flow characteristics, and
numerical analysis.
Jung-Hwan Byun received his B.S. and M.S. degrees from National Fisheries University of Pusan, Korea, in 1992 and 1995, respectively. He
then received his Ph.D. degree from Pukyong National University in 1997. Dr. Byun is currently an Associate Professor at the
Faculty of Marine Technology at Chonnam National University in Yeosu, Korea. His research interests include numerical analysis
and synchronous control. 相似文献
5.
Seung-Keon Lee Kyoung-Ho Sohn Seung-Woo Byun Joon-Young Kim 《Journal of Mechanical Science and Technology》2009,23(4):987-990
This paper describes the mathematical model and controller design for Manta-type unmanned underwater test vehicle (MUUTV)
with 6 DOF nonlinear dynamic equations. The mathematical model contains hydrodynamic forces and moments expressed in terms
of a set of hydrodynamic coefficients which were obtained through the PMM (planar motion mechanism) test. Based on the 6 DOF
dynamic equations, numerical simulations have been performed to analyze the dynamic performance of the MUUTV. In addition,
using the mathematical model PID and sliding mode controller are constructed for the diving and steering maneuver. Simulation
results show that the control performance of the MUUTV compared with that of NPS (Naval Postgraduate School) AUV II.
This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008.
Seung-Keon Lee received the B.S. and M.S. degrees from Pusan National University, in 1982 and 1984, respectively, and the Ph.D. degree from
University of Tokyo in 1988. He is currently a Professor in the Department of Naval Architecture and Ocean Engineering, Pusan
National University, Busan, Korea. His research interests are about the hydrodynamic force and mathematical model for the
motion of surface and underwater vehicles.
Joon-Young Kim received the B.S. and M.S. degrees from Inha University, in 1989 and 1993, respectively, and the Ph.D. degree from Hanyang
University in 1999. He is currently a Professor in the Department of Ocean System Engineering, Jeju National University, Jeju,
Korea. His current research interests are in unmanned underwater vehicle design and control. 相似文献
6.
Experimental analysis for reducing refrigerant-induced noise of 4-way cassette type air conditioner 总被引:1,自引:0,他引:1
Hyung Suk Han Weui Bong Jeong Shigeo Aoyama Jin Yong Mo 《Journal of Mechanical Science and Technology》2009,23(5):1456-1467
Various refrigerant flow patterns can produce a range of noise types according to their cycle conditions. Consequently, the
identification of flow patterns in a tube is crucial to reducing refrigerant-induced noise. Because of the obstacles involved
in identifying them accurately by experiment, in this paper, these flow patterns are estimated from the flow pattern map.
Working from the assumption that the refrigerant-induced noise for an air conditioner in the heating mode comes from slug
flow in the condenser-outlet pipe, the reduction of refrigerant-induced noise by avoiding slug flow in a tube is examined.
To fully understand the conditions under which the refrigerant-induced noise occurs, cycle simulator equipment for an outdoor
unit is developed. With this cycle simulator, noise tests of 4-way cassette type indoor units are performed under the conditions
that the refrigerant-induced noise occurs. Increasing the mass flux in a tube by reducing the diameter of the condenser-outlet
pipe can avoid slug flow, and the refrigerant-induced noise can therefore be reduced. The results of the cycle simulator can
be verified with an outdoor unit 5HP system multi air conditioner and the results are well in line with simulator results.
This paper was recommended for publication in revised form by Associate Editor Yeon June Kang
Hyung-Suk Han received a B.S. degree in Production and Mechanical Engineering from Pusan National University in 1996. He then went on to
receive his M.S. and Ph.D. degrees from Pusan National University in 1998 and 2007, respectively. Dr. Han is currently a Senior
Researcher at Defense Agency of Technology and Quality, Pusan, Korea. He is currently serving as a Co-Researcher of Noise
and Vibration Analysis Laboratory in Pusan National University. Dr. Han’s research interests are in the area of the mechanical
applications of noise and vibration including refrigerant-induced noise.
Wei-Bong Jeong received a B.S. degree in Mechanical Engineering from Seoul National University in 1978. He then went on to receive his M.S.
and Ph.D. degrees from KAIST in 1980 and from Tokyo Institute of Technology in 1990, respectively. Dr. Jeong is currently
a Professor at the Mechanical Engineering at Pusan National University in Busan, Korea. He is currently serving as an Academic
Director of the Korean Society for Noise and Vibration Engineering. Dr. Jeong’s research interests are in the area of the
measurement and signal processing of noise and vibration, finite/boundary element programming of noise and vibration, fluid-structure
interactions and acoustic-structure interactions. 相似文献
7.
Friction-induced ignition modeling of energetic materials 总被引:1,自引:0,他引:1
Min-cheol Gwak Tae-yong Jung Jack Jai-ick Yoh 《Journal of Mechanical Science and Technology》2009,23(7):1779-1787
The heat released during the external frictional motion is a factor responsible for initiating energetic materials under all
types of mechanical stimuli including impact, drop, or penetration. We model the friction-induced ignition of cyclotrimethylenetrinitramine
(RDX), cyclotetramethylene-tetranitramine (HMX), and ammonium-perchlorate/ hydroxylterminated-polybutadiene (AP/HTPB) propellant
using the BAM friction apparatus and one-dimensional time to explosion (ODTX) apparatus whose results are used to validate
the friction ignition mechanism and the deflagration kinetics of energetic materials, respectively. A procedure to obtain
the time-to-ignition for each energetic sample due to friction is outlined.
This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008.
Min-cheol Gwak received his B.S. degree in Mechanical Engineering from Korea Aerospace University, Korea, in 2007. Now he is a graduate
student of Mechanical and Aerospace Engineering at Seoul National University in Seoul, Korea. His research interests are ignition
of high energy material and combustion phenomena.
Tae-yong Jung received his B.S. degree in Mechanical and Aerospace Engineering from Seoul National University, Korea, in 2007. Now he is
a graduate student of Mechanical and Aerospace Engineering at Seoul National University in Seoul, Korea. His research interests
are solid propellant combustion and phase transformation.
Professor J. Yoh received his BSME from UC Berkeley in 1992 and MSME from UCLA in 1995. His doctoral degree is in Theoretical & Applied Mechanics
from the University of Illinois at Urbana-Champaign, 2001. His research interest is in high energy system design using high
power lasers and condensed energetic materials. 相似文献
8.
The hybrid Cartesian/immersed boundary method is applied to fluid-structure interaction of a moving flexible foil. A new algorithm
is suggested to classify immersed boundary nodes based on edges crossing a boundary. Velocity vectors are reconstructed at
the immersed boundary nodes by using the interpolation along a local normal line to the boundary. For eliminating pressure
reconstruction, the hybrid staggered/non-staggered grid method is adapted. The deformation of an elastic body is modeled based
on dynamic thin-plate theory. To validate the developed code first, free rotation of a foil in a channel flow is simulated
and the computed angular motion is compared with other computational results. The code is then applied to the fluid-structure
interaction of a moving flexible foil which undergoes large deformation due to the fluid loading caused by horizontal sinusoidal
motion. It has been shown that the moving flexible foil can generate much larger vertical force than the corresponding rigid
foil and the vertical force can be attributed to the downward fluid jet due to the alternating tail deflection.
This paper was recommended for publication in revised form by Associate Editor Haecheon Choi
Sangmook Shin received his B.S. and M.S. degrees in Naval Architecture from Seoul National University, Korea in 1989 and 1991, respectively.
He received his Ph.D. degree in Aerospace Engineering from Virginia Tech, USA in 2001. He is currently an Assistant Professor
at Department of Naval Architecture and Marine Systems Engineering at Pukyong National University in Busan, Korea. His research
interests include fluid-structure interaction, unstructured grid method, internal wave, and two-phase flow.
Hyoung Tae Kim received the B.S. and M.S. degrees in Naval Architecture from Seoul National University in 1979 and 1981, respectively and
the Ph.D. degree in Mechanical Engineering from University of Iowa, U.S.A. in 1989. Dr. Kim is currently a Professor at the
Department of Naval Architecture & Ocean Engineering at Chungnam National University, Korea. His research interests are in
the area of Ship Hydrodynamics, CFD calculations of turbulent flows around ships and propellers, and human-powered and solar
boat design. 相似文献
9.
Jeonghyun Sohn Seokcheon Park Jaewook Lee Wansuk Yoo 《Journal of Mechanical Science and Technology》2009,23(4):1023-1026
A side collision reconstruction algorithm using a database based on the deformed shape information from experiments is suggested.
A deformation index related to the deformed shape is developed to set the database for the side collision reconstruction algorithm.
Two small-sized model cars are developed to carry out the side collision test. Several side collision tests according to velocities
and collision angles are performed for establishing side collision database. A high speed camera with 1000fps is used to capture
the motion of the car. Side collision reconstruction algorithm is developed and applied to find the collision conditions before
the accident occurred. Several collision cases are tested to validate the database and the algorithm. A database from computer
simulation is verified with experiments. According to comparing errors between simulation and experiment, it is satisfied
within 6.6%.
This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008.
Dr. Jeong-Hyun Sohn received his B.S. degree from Pusan National University (1995), M.S. from PNU (1999), and Ph.D. from PNU (2002). He is currently
an associate professor in the department of Mechanical Engineering at Pukyong National University in Busan, Korea. He is currently
serving as a board member of dynamics and control division, KSME. His major area is vehicle dynamics and flexible multibody
dynamics.
Dr. Wan-Suk Yoo received his B.S. degree from Seoul National University (1976), M.S. from KAIST (1978) and Ph.D. from University of Iowa(1985).
He is professor at Pusan National University, and currently serving as a vice president in KSME. His major area is vehicle
dynamics and flexible multibody dynamics. 相似文献
10.
Seok-Heum Baek Seok-Swoo Cho Hyun-Su Kim Won-Sik Joo 《Journal of Mechanical Science and Technology》2009,23(5):1225-1233
As the cumulative running times of a locomotive truck increases, degradation such as fatigue, wear, and deterioration occur.
Particularly the container train and uncovered freight train, their maintenance cost during their lifetime is three times
more than the manufacturing cost. Generally, for the freight train, corrective maintenance to repair a bad part after a breakdown
is not adapted; however, preventive maintenance that fixes a bad part before a breakdown is. Therefore, it is important and
necessary to establish a system of optimal preventive maintenance and exact maintenance period. This study attempts to propose
a preventive maintenance procedure that predicts a repair period using reliability function and instantaneous failure rate
based on fatigue test and load history data. Additionally, this method is applied to the end beam of an uncovered freight
train, which is the brake part, and its usefulness is examined and analyzed.
This paper was recommended for publication in revised form by Associate Editor Chongdu Cho
Seok-Heum Baek received a B.S. and M.S. degree in Mechanical Engineering from the Dong-A University in 2001 and 2003, respectively. He is
currently a Ph.D. student at the School of Mechanical Engineering at Dong-A University in Busan, Korea. Student Baek works
on ceramic composite design and robust and reliability-based design, and his research interests are in the areas of trade-off
analysis in multicriteria optimization, design under uncertainty with incomplete information, and probabilistic design optimization.
Seok-Swoo Cho received a B.S. degree in Mechanical Engineering from Dong-A University in 1991. He then went on to receive his M.S. from
Dong-A University in 1993 and Ph.D. degree from Dong-A University in 1997. Dr. Cho is currently a Professor at the Vehicle
Engineering at Kangwon National University in Kangwon-do, Korea. Dr. Cho works on crack growth modeling and composite design
and optimization, and his research interests are in the areas of structural optimization and inverse and identification problems,
and X-ray diffraction, brittle collapse and crack propagation, fatigue fracture phenomena.
Hyun-Su Kim received a B.S. degree in Mechanical Engineering from Seoul National University in 1978. He then went on to receive his M.S.
from KAIST in 1980 and Ph.D. degree from University of Iowa in 1989. Dr. Kim is currently a Professor at the Mechanical Engineering
at Dong-A University in Busan, Korea. His research interests are in the area of high temperature creep fatigue, bio-engineering,
design using the finite element method, optimization, and MEMS.
Won-Sik Joo received a B.S. degree in Mechanical Engineering from Dong-A University in 1968. He then went on to receive his M.S. from
Dong-A University in 1978 and Ph.D. degree from Kookmin University in 1988. Dr. Joo is currently a Professor at the Mechanical
Engineering at Dong-A University in Busan, Korea. His research interests are in the area of creep and fatigue in high temperature
alloy, fatigue design, and strength evaluation. 相似文献
11.
Jong Won Choi Mo Se Kim Jeong-Seob Shin Sai-Kee Oh Baik-Young Chung Min Soo Kim 《Journal of Mechanical Science and Technology》2009,23(7):1858-1865
In HVAC system, the oil circulation is inevitable because the compressor requires the oil for lubrication and sealing. A small
portion of the oil circulates with the refrigerant flow through the system components while most of the oil stays or goes
back to the compressor. Because oil retention in refrigeration systems can affect system performance and compressor reliability,
proper oil management is necessary in order to improve the compressor reliability and increase the overall efficiency of the
system. This paper describes a numerical analysis of oil distribution in each component of the commercial air conditioning
system including the suction line, discharge line and heat exchanger. In this study, system modeling was conducted for a compressor,
discharge line, condenser, expansion valve, evaporator and suction line. Oil separation characteristics of the compressor
were taken from the information provided by manufacturer. The working fluid in the system was a mixture of a R-410A refrigerant
and PVE oil. When the oil mass fraction (OMF) was assumed, oil mass distribution in each component was obtained under various
conditions. The total oil hold-up was also investigated, and the suction line contained the largest oil hold-up per unit length
of all components.
This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008.
Min Soo Kim received his B.S., M.S., and Ph.D. degree at Seoul National University, Korea in 1985, 1987, and 1991, respectively. After
Ph.D. degree, Prof. Kim worked at National Institute of Standards and Technology (NIST) in U.S.A. for about three years. He
is currently a professor at the School of Mechanical and Aerospace Engineering of Seoul National University, Korea.
Jong Won Choi received B.S. degree in Mechanical Engineering from Korea University in Seoul, Korea, in 2004, and then received M.S. degrees
from Seoul National University in 2006. He is currently a student in Ph.D. course at the School of Mechanical and Aerospace
Engineering of Seoul National University in Seoul, Korea. His research interests include refrigeration system, micro-fluidic
devices, and PEM fuel cell as an alternative energy for next generation.
Mo Se Kim received B.S. degree in Mechanical and Aerospace Engineering from Seoul National University in Seoul, Korea, in 2007. He
is currently a student in M.S. course at the School of Mechanical and Aerospace Engineering of Seoul National University in
Seoul, Korea. He had studied on the oil migration in the heat pump system, and now he studies on the refrigeration system
using an ejector.
Baik-Young Chung received his B.S., M.S., and Ph.D. degrees in Mechanical Engineering from Inha University, Korea in 1984, 1986, and 2001,
respectively. He is currently a research fellow of HAC Research Center at LG Electronics. He is responsible for the commercial
air conditioner group.
Sai-Kee Oh received B.S. degree in Mechanical Engineering from Seoul National University, Korea in 1989, and then received M.S. and
Ph.D. degrees from KAIST, Korea in 1991 and 1997, respectively. He is currently a principal research engineer of HAC Research
Center at LG Electronics. He is responsible for the residential air conditioner group.
Jeong-Seob Shin received B.S. degree in Machine Design and Production Engineering from Hanyang University, Korea in 1988, M.S. degree in
Mechanical Engineering from KAIST, Korea in 1991, and Ph.D. degree in Mechanical Engineering from POSTECH, Korea in 2004.
He has joined HAC Research Center at LG Electronics since 2006 as a principal research engineer. 相似文献
12.
Model-based fault detection and isolation in steer-by-wire vehicle using sliding mode observer 总被引:1,自引:0,他引:1
Jae Sung Im Fuminori Ozaki Tae Kyeong Yeu Shigeyasu Kawaji 《Journal of Mechanical Science and Technology》2009,23(8):1991-1999
Steer-by-Wire system (SbW), in which the conventional mechanical linkages between the steering wheel and the front wheel are
removed, is suited to active steering control, improving vehicle stability, dynamics and maneuverability. And SbW is implemented
to autonomous steering control to assist the driver. However, the SbW vehicle contains unsolved important problems about fault
tolerant function. For example, it is the detection of sensor fault and multiplicative fault simultaneously. Fault detection
and isolation (FDI) is essential in fault-tolerant problems, and conventional FDI for SbW was based on Kalman filter. But
this method has weak robustness and cannot detect sensor fault and multiplicative fault simultaneously. We propose a novel
model-based fault detection and isolation method using sliding mode observer in the SbW vehicle, which contains measurement
of sensor fault and multiplicative fault. The effectiveness of the proposed method is verified by simulations.
This paper was recommended for publication in revised form by Associate Editor Kyoungsu Yi
Jae-Sung Im was born in Busan, Korea in 1978. He received his B.S. and M.S. degrees in Mechanical Engineering from Pukyong National University,
Korea, in 2003 and 2005, respectively. He then received his Ph.D. degree from Kumamoto University, Japan, in 2009. His interests
are in vehicle dynamics, robust control, fault detection and isolation, and man-machine interface.
Fuminori Ozaki received the B.S. and M.S. degrees from the Department of Computer Science, Kumamoto University, Japan, in 1998 and 2000.
In 2000, he joined OMRON Corporation, Kyoto, Japan, where he developed semiconductor manufacturing equipment. His current
interests include EPS control and KANSEI engineering.
Tae-Kyeong Yue received the B.S. and M.S. degrees from Pukyong National University, Korea, in 1998 and 2000, respectively. He received the
Ph.D. degree from Kumamoto University, Kumamoto, Japan in 2003. He is working in the Korea Ocean Research and Development
Institute (KORDI), Korea. His interests are fault detection and isolation, decentralized control and control of deep-sea mining
system.
Shigeyasu Kawaji received his Master of Engineering in Electrical Engineering and Doctor of Engineering in Control Engineering from Kumamoto
University and Tokyo Institute of Technology, Japan, in 1969 and 1980, respectively. He joined the Department of Electronic
Engineering of Kumamoto University, Japan, where he is presently as a full professor. He is the Director of System Integration
Laboratory. He is presently the President of Advanced Health Laboratory Ltd. His current research interest includes robust
control, intelligent control mechatronics and robotics, fusion of medicine and engineering, and automotive mechatronic systems. 相似文献
13.
Kyung-Hyun Choi Hyung-Chan Kim Yang-Hoi Doh Dong-Soo Kim 《Journal of Mechanical Science and Technology》2009,23(4):1102-1111
A solid freeform fabrication (SFF) system using selective laser sintering (SLS) is currently recognized as a leading process
of fabrication using variable materials, and SLS extends the application to machinery and automobiles. Due to the time delay
in the sintering process, shrinkage and warping often occur. Curling also occurs due to laser and scan delays. These problems
affect not only the accuracy of the fabricated product but also the total system efficiency. These deficiencies can be overcome
by reducing the total processing time of the SFF system. To accomplish this, the laser scanning time, from mark (laser on)
to jump (laser off), must be reduced as it contributes the major part of the total processing time. This can be done by employing
area division scan path generation, which promotes digital efficiency. A simulation and an experiment was carried out in this
study to evaluate the developed scan path method.
This paper was recommended for publication in revised form by Associate Editor Dae-Eun Kim
Kyung-Hyun Choi received his B.S. and M.S. degrees in Mechanical Engineering from Pusan National University, Korea, in 1983 and 1990,. He
then received his M.S. and Ph.D. degrees from University of Ottawa in 1995. Dr. Choi is currently a professor at the School
of Mechanical Engineering at Cheju National University, Korea. His research interests include micro-machining, printed Electronics.
Hyung-Chan Kim received his B. S. and M. S. degrees in Electronics Engineering from Cheju National University, Korea, in 2006 and 2008,
respectively. Mr. Kim is currently a Ph.D. candidate at the School of Electronics Engineering at Cheju National University,
Korea. His research interests include RP System, micro-machining, printed Electronics.
Yang-Hoi Doh received his B.S. and M.S. degrees in Electronics Engineering from KyungBuk National University, Korea, in 1982 and 1984,
respectively. He then received his Ph.D. degree from University of Kyung Buk National University, Korea, in 1988. Dr. Doh
is currently a Professor at the School of Electronics Engineering at Cheju National University, Korea. His research interests
include micro-machining, Digital signal processing.
Dong-Soo Kim received his M.S. and Ph.D. degrees in Mechanical Engineering from Yung Nam University, Korea, in 1991 and 2001, respectively.
Dr. Kim is currently the general manager at Nano Mechanical System Research Division at Korea Institute of Machinery & Materials.
His research interests include printed Electronics, R2R printing, RP system. 相似文献
14.
Defect diagnostics of SUAV gas turbine engine using hybrid SVM-artificial neural network method 总被引:1,自引:0,他引:1
Sang-Myeong Lee Tae-Seong Roh Dong-Whan Choi 《Journal of Mechanical Science and Technology》2009,23(2):559-568
A hybrid method of an artificial neural network (ANN) combined with a support vector machine (SVM) has been developed for
the defect diagnostic system applied to the SUAV gas turbine engine. This method has been suggested to overcome the demerits
of the general ANN with the local minima problem and low classification accuracy in case of many nonlinear data. This hybrid
approach takes advantage of the reduction of learning data and converging time without any loss of estimation accuracy because
the SVM classifies the defect location and reduces the learning data range. The results of test data have shown that the hybrid
method is more reliable and suitable algorithm than the general ANN for the defect diagnosis of the gas turbine engine.
This paper was recommended for publication in revised form by Associate Editor Tong Seop Kim
Tae-Seong Roh received his B.S. and M.S. degrees in Aeronautical Engineering from Seoul National University in 1984 and 1986. He then went
on to receive his Ph.D. degree from Pennsylvania State University in 1995. Dr. Roh is currently a Professor at the department
of Aerospace Engineering at Inha University in Incheon, Korea. His research interests are in the area of combustion instabilities,
rocket and jet propulsion, interior ballistics, and gas turbine engine defect diagnostics.
Dong-Whan Choi received his B.S. degree in Aeronautical Engineering from Seoul National University in 1974. He then went on to receive his
M.S. and Ph.D. degrees from University of Washington in 1978 and 1983. Dr. Choi served three years as a President of the Korea
Aerospace Research Institute from 1999. He is currently a professor at the department of Aerospace Engineering at Inha University
in Incheon, Korea. His research interests are in the area of turbulence, jet propulsion, and gas turbine defect diagnostics. 相似文献
15.
Zhen-Zhe Li Kwang-Su Heo Dong-Ji Xuan Seoung-Yun Seol 《Journal of Mechanical Science and Technology》2009,23(3):607-613
Thermoforming is one of the most versatile and economical processes available for polymer products, but cycle time and production
cost must be continuously reduced in order to improve the competitive power of products. In this study, water spray cooling
was simulated to apply to a cooling system instead of compressed air cooling in order to shorten the cycle time and reduce
the cost of compressed air used in the cooling process. At first, cooling time using compressed air was predicted in order
to check the state of mass production. In the following step, the ratio of removed energy by air cooling or water spray cooling
among the total removed energy was found by using 1-D analysis code of the cooling system under the condition of checking
the possibility of conversion from 2-D to 1-D problem. The analysis results using water spray cooling show that cycle time
can be reduced because of high cooling efficiency of water spray, and cost of production caused by using compressed air can
be reduced by decreasing the amount of the used compressed air. The 1-D analysis code can be widely used in the design of
a thermoforming cooling system, and parameters of the thermoforming process can be modified based on the recommended data
suitable for a cooling system of thermoforming.
This paper was recommended for publication in revised form by Associate Editor Dongsik Kim
Zhen-Zhe Li received his B.S. degree in Mechanical Engineering from Yanbian University, China, in 2002. He then received his M.S. degree
in Aerospace Engineering from Konkuk University, South Korea, in 2005. He then received his Ph.D. degree in Mechanical Engineering
from Chonnam National University, South Korea, in 2009. Dr. Li is currently a Researcher of the Department of Mechanical Engineering,
Chonnam National University, South Korea. Dr. Li’s research interests include applied heat transfer, fluid mechanics and optimal
design of thermal and fluid systems.
Kwang-Su Heo received his B.S. degree in Mechanical Engineering from Chonnam National University, South Korea, in 1998. He then received
his M.S. and Ph.D. degrees in Mechanical Engineering from Chonnam National University, South Korea, in 2003 and 2008, respectively.
Dr. Heo is currently a Post-doctorial Researcher of the Department of Mechanical Engineering, KAIST(Korean Advanced Institute
of Science and Technology), South Korea. Dr. Heo’s research interests include applied heat transfer, fluid mechanics and thermal
analysis of superconductor.
Dong-Ji Xuan received his B.S. degree in Mechanical Engineering from Harbin Engineering University, China, in 2000. He then received his
M.S. degree in Mechanical Engineering from Chonnam National University, South Korea, in 2006. He is currently a Ph.D. candidate
of the Department of Mechanical Engineering, Chonnam National University, South Korea. His research interests include control
& optimization of PEM fuel cell system, dynamics & control, mechatronics.
Seoung-Yun Seol received his B.S. degree in Mechanical Design from Seoul National University, South Korea, in 1983. He then received his
M.S. degree in Mechanical Engineering from KAIST(Korean Advanced Institute of Science and Technology), South Korea, in 1985.
He then received his Ph.D. degree in Mechanical Engineering from Texas Tech University, USA, in 1993. Dr. Seol is currently
a Professor of the School of Mechanical and Systems Engineering, Chonnam National University, South Korea. Dr. Seol’s research
interests include applied heat transfer, fluid mechanics and thermal analysis of superconductor. 相似文献
16.
A study on separate learning algorithm using support vector machine for defect diagnostics of gas turbine engine 总被引:1,自引:0,他引:1
Sang-Myeong Lee Won-Jun Choi Tae-Seong Roh Dong-Whan Choi 《Journal of Mechanical Science and Technology》2008,22(12):2489-2497
A separate learning algorithm with support vector machine (SVM) has been studied for the development of a defect-diagnostic
algorithm applied to the gas turbine engine. The system using only an artificial neural network (ANN) falls in a local minima
and its classification accuracy rate becomes low in case it is learning nonlinear data. To make up for this risk, a separate
learning algorithm combining ANN with SVM has been proposed. In the separate learning algorithm, a sequential ANN learns selectively
after classification of defect patterns and discrimination of defect position using SVM, resulting in higher classification
accuracy rate as well as the rapid convergence by decreasing the nonlinearity of the input data. The results have shown this
suggested method has reliable and suitable estimation accuracy of the defect cases of the turbo-shaft engine.
This paper was recommended for publication in revised form by Associate Editor Dongsik Kim
Tae-Seong Roh received his B.S. and M.S. degrees in Aeronautical Engineering from Seoul National University in 1984 and 1986. He then went
on to receive his Ph.D. degree from Pennsylvania State University in 1995. Dr. Roh is currently a Professor at the department
of Aerospace Engineering at Inha University in Incheon, Korea. His research interests are in the area of combustion instabilities,
rocket and jet propulsions, interior ballistics, and gasturbine engine defect diagnostics.
Dong-Whan Choi received his B.S. degree in Aeronautical Engineering from Seoul National University in 1974. He then went on to receive his
M.S. and Ph.D. degrees from University of Washington in 1978 and 1983. Dr. Choi had served three years as a President of Korea
Aerospace Research Institute since 1999. He is currently a Professor at the department of Aerospace Engineering at Inha University
in Incheon, Korea. His research interests are in the area of turbulence, jet propulsions, and gasturbine defect diagnostics. 相似文献
17.
Jae Hyuk Choi Junhong Kim SangKyu Choi Byoung-Ho Jeon Osamu Fujita Suk Ho Chung 《Journal of Mechanical Science and Technology》2009,23(3):707-716
A numerical study on soot deposition in ethylene diffusion flames has been conducted to elucidate the effect of thermophoresis
on soot particles under a microgravity environment. Time-dependent reactive-flow Navier-Stokes equations coupled with the
modeling of soot formation have been solved. The model was validated by comparing the simulation results with the previous
experimental data for a laminar diffusion flame of ethylene (C2H4) with enriched oxygen (35% O2 + 65% N2) along a solid wall. In particular, the effect of surrounding air velocity as a major calculation parameter has been investigated.
Especially, the soot deposition length defined as the transverse travel distance to the wall in the streamwise direction is
introduced as a parameter to evaluate the soot deposition tendency on the wall. The calculation result exhibits that there
existed an optimal air velocity for the early deposition of soot on the surface, which was in good agreement with the previous
experimental results. The reason has been attributed to the balance between the effects of the thermophoretic force and convective
motion.
This paper was recommended for publication in revised form by Associate Editor Ohchae Kwon
Jae Hyuk Choi received his B.S. and M.S. degrees in Marine System Engineering from Korea Maritime University in 1996 and 2000, respectively.
He then went on to receive a Ph.D. degrees from Hokkaido university in 2005. Dr. Choi is currently a BK21 Assistant Professor
at the School of Mechanical and Aerospace Engineering at Seoul National University in Seoul, Korea. Dr. Choi’s research interests
are in the area of reduction of pollutant emission (Soot and NOx), high temperature combustion, laser diagnostics, alternative
fuel and hydrogen production with high temperature electrolysis steam (HTES).
Junhong Kim received his B.S., M.S., and Ph. D degrees in Mechanical Engineering from Seoul National University in 1998, 2000, and 2004,
respectively. His research interests include lifted flames, edge flames, and numerical simulation.
Sang Kyu Choi received his B.S. degree in Mechanical Engineering from Seoul National University in 2004. He is a Ph. D student in the School
of Mechanical Engineering, Seoul National University. His research interests include edge flames, oxy-fuel combustion, and
numerical simulation.
Byoung ho Jeon received his B.S degrees in Mechanical Engineering from kangwon University in 1998, and M.S., Ph. D. degrees in Mechanical
Engineering from Hokkaido University in 2002, 2008, respectively. Dr Jeon is working at Korea Aerospace Research Institute
from 2007. June. as Gasturbine engine developer. Jeon’s research interests are in the area of reduction of pollutant emission
(Soot and Nox), High temperature combustion, combustion system (Furnace, Combine Generation system, IGCC, CTL), and Fire safety
in building.
Osamu Fujita received his B.S., M.S., and Ph. D. degrees in Mechanical Engineering from Hokkaido University in 1982, 1984, and 1987, respectively.
Prof. Fujita is currently a Professor at the division of Mechanical and space Engineering at Hokkaido University in sapporo,
Japan. Prof. Fujita’s research interests are in the area of reduction of pollutant emission (Soot and Nox), solid combustion,
catalytic combustion, high temperature combustion, alternative fuel and fire safety in space.
Suk Ho Chung received his B.S. degree in Mechanical Engineering in 1976 from Seoul National University, and his M.S. and Ph. D. degree
in Mechanical Engineering in 1980 and 1983, respectively from Northwestern University. He is a professor since 1984 in the
School of Mechanical and Aerospace Engineering, Seoul National University. His research interests cover combustion fundamentals,
pollutant formation, and laser diagnostics. 相似文献
18.
Hee-Jang Moon Yang-Ho Park Youngbin Yoon 《Journal of Mechanical Science and Technology》2009,23(6):1751-1759
The characteristics of NOx emissions in pure hydrogen nonpremixed jet flames with coaxial air are analyzed numerically for
a wide range of coaxial air conditions. Among the models tested in simple nonpremixed jet flame, the one-half power scaling
law could be reproduced only by the Model C using the HO2/H2O2 reaction, implying the importance of chemical nonequilibrium effect. The flame length is reduced significantly by augmenting
coaxial air, and could be represented as a function of the ratio of coaxial air to fuel velocity. Predicted EINOx scaling
showed a good concordance with experimental data, and the overall one-half power scaling was observed in coaxial flames with
Model C when flame residence time was defined with flame volume instead of a cubic of the flame length. Different level of
oxygen mass fraction at the stoichiometric surface was observed as coaxial air was increased. These different levels imply
that the coaxial air strengthens the nonequilibrium effect.
This paper was recommended for publication in revised form by Associate Editor Haecheon Choi
Hee-Jang Moon received his B.S. degree in Aeronautical Engineering from Inha University, Korea in 1986. He then received his M.S. and Doctoral
degrees from Universite de Rouen, France in 1988 and 1991, respectively. Dr. Moon is currently a Professor at the School of
Aerospace and Mechanical Engineering at Korea Aerospace University in Koyang, Korea. He serves on the Editorial Board of the
Korean Society of Propulsion Engineers. His research interests are in the area of turbulent combustion, hybrid rocket combustion
and nanofluids.
Youngbin Yoon received his B.S. and M.S. degrees in Aerospace Engineering from Seoul National University, Korea in 1985 and 1987, respectively.
He received a Ph.D. degree from the University of Michigan in 1994. Dr. Yoon is currently a professor at the School of Mechanical
and Aerospace Engineering in Seoul National University, Korea. He is currently on the Editorial board and executive of ILASS-KOREA.
The research areas of Dr. Yoon are liquid rocket injectors, combustion instability and control, ram and gas turbine combustor
and laser diagnostics. 相似文献
19.
Jin Hwan Ko Jee Woong Kim Soo Hyung Park Doyoung Byun 《Journal of Mechanical Science and Technology》2009,23(6):1727-1735
Nature-inspired flapping foils have attracted interest for their high thrust efficiency, but the large motions of their boundaries
need to be considered. It is challenging to develop robust, efficient grid deformation algorithms appropriate for the large
motions in three dimensions. In this paper, a volume grid deformation code is developed based on finite macro-element and
transfinite interpolation, which successfully interfaces to a structured multi-block Navier-Stokes code. A suitable condition
that generates the macro-elements with efficiency and improves the robustness of grid regularity is presented as well. As
demonstrated by an airfoil with various motions related to flapping, the numerical results of aerodynamic forces by the developed
method are shown to be in good agreement with those of an experimental data or a previous numerical solution.
This paper was recommended for publication in revised form by Associate Editor Do Hyung Lee
Jin Hwan Ko received his B.S. degree in Mechanical Engineering from KAIST, Korea, in 1995. He then received his M.S. and Ph.D. degrees
from KAIST in 1997 and 2004, respectively. Dr. Ko is currently a research professor at the School of Mechanical and Aerospace
Engineering at Seoul National University in Seoul, Korea. His research interests include fluid-structure interaction analysis,
structural dynamics of a micro-scale resonator, and model order reduction.
Soo Hyung Park received his B.S. degree in Aerospace Engineering from KAIST, Korea, in 1996. He then received his M.S. and Ph.D. degrees
from KAIST in 1999 and 2003, respectively. Prof. Park is currently an assistant professor at the Dept. of Aerospace Information
Engineering at Konkuk University in Seoul, Korea. His research interests include computational fluid dynamics, fluid-structure
interaction analysis, rotorcraft aerodynamics, and turbulence modeling. 相似文献
20.
This investigation is concerned with the topology optimization using displacement-based nonconforming finite elements for
problems involving incompressible materials. Although the topology optimization with mixed displacement-pressure elements
was performed, a displacement-based approach can be an efficient alternative because it interpolates displacement only. After
demonstrating the Poisson locking-free characteristics of the employed nonconforming finite elements by a simple patch test,
the developed method is applied to solve the design problems of mounts involving incompressible solid or fluid. The numerical
performance of the nonconforming elements in topology optimization was examined also with existing incompressible problems.
This paper was recommended for publication in revised form by Associate Editor Tae Hee Lee
Gang-Won Jang received his M.S. degree in 2000, and Ph.D. degree in 2004, both from the School of Mechanical and Aerospace Engineering,
Seoul National University, Seoul, Korea. He is currently an Assistant Professor at the School of Mechanical and Automotive
Engineering, Kunsan National University, Jeonbuk, Korea. His current interest concerns topology optimization of multiphysics
problems and thin-walled beam analysis.
Yoon Young Kim received his B.S. and M.S degrees from Seoul National University, Seoul, Korea, and the Ph.D. degree from Stanford University,
Palo Alto, CA, in 1989. He has been on the faculty of the School of Mechanical and Aerospace Engineering, Seoul National University,
since 1991. He is also the Director of the National Creative Research Initiatives Center for Multiscale Design. His main research
field is the optimal design of multiphysics systems, mechanisms, and transducers. He has served as an editor of several Korean
and international journals, and as an organizing committee member of several international conferences. 相似文献