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1.
Young-Deuk Kim Deok-Hong Kang Woo-Seung Kim 《Journal of Mechanical Science and Technology》2009,23(3):631-642
Experimental and numerical studies were performed by considering convective and radiative heat transfer to predict the transient
thermal behavior of a plate in an indirectly fired continuous heat treatment furnace. The temperature profiles in the plate
were determined by solving the transient one-dimensional heat conduction equation in conjunction with appropriate boundary
conditions by using a time marching scheme. The results obtained from the transient analysis were substantiated by comparing
with experimental results. Additionally, parametric investigations were performed to examine how the thermal behavior of the
plate is affected by plate and refractory emissivities, charging temperature and residence time of the plate, gas temperature
of the work and drive sides of the heat treatment furnace, and plate thickness.
This paper was recommended for publication in revised form by Associate Editor Ohchae Kwon
Young-Deuk Kim is a graduate student at Hanyang University in Seoul, Korea. He earned his B.S. in Mechanical Engineering from Korea Maritime
University in 2002 and his M.S. in mechanical engineering from Hanyang university in 2004. His current research areas are
modeling of automotive aftertreatment catalysts, optimal design of thermal systems, and phase change modeling with free surface
flow.
Deok-Hong Kang is a senior researcher at the RIST (Research Institute of Industrial Science and Technology) in Pohang, Korea. He earned
his B.S. and M.S. in mechanical engineering from Hanyang University in 1989 and 1993, respectively, and his Ph.D. in mechanical
engineering from POSTECH in 2004. His current research areas are mathematical modeling for combustion control, furnace optimization
control system, and energy saving engineering in all kinds of furnaces.
Woo-Seung Kim is a professor in mechanical engineering at Hanyang University in Ansan, Korea. He earned his B.S. in Mechanical Engineering
in 1981 from Hanyang University and his M.S. and Ph.D. in mechanical engineering from North Carolina State University in 1986
and 1989, respectively. His current research areas are modeling of automotive aftertreatment systems, inverse heat transfer
problems, optimal design of thermal systems, and phase change heat transfer problems with free surface flow. 相似文献
2.
Young Chul Kwon Dae Hoon Kim Jae Heon Lee Jun Young Choi Sang Jae Lee 《Journal of Mechanical Science and Technology》2009,23(3):698-706
This paper presents the heat transfer characteristics of the internal heat exchanger (IHX) for CO2 heat pump system. The influence on the IHX length, the mass flow rate, the shape of IHX, the operating condition, and the
oil concentration was investigated under a cooling condition. Four kinds of IHX with a coaxial type and a micro-channel type,
a mass flow meter, a pump, and a measurement system. With increasing of the IHX length, the capacity, the effectiveness, and
the pressure drop increased. For the mass flow rate, the capacity of micro-channel IHX are higher about 2 times than those
of coaxial IHX. The pressure drop was larger at cold-side than at hot-side. In the transcritical CO2 cycle, system performance is very sensitive to the IHX design. Design parameters are closely related with the capacity and
the pressure drop of CO2 heat pump system. Along the operating condition, the performance of CO2 IHXs is different remarkably. For oil concentration 1, 3, 5%, the capacity decreases and the pressure drop increased, as
compared with oil concentration 0%.
This paper was recommended for publication in revised form by Associate Editor Yong Tae Kang
Prof. Young-Chul Kwon received his B.S. degree in Precision Mechanical Engineering from Pusan National University, Korea, in 1989. He then received
his M.S. and Ph.D. degrees from POSTECH, in 1991 and 1996, respectively. Dr. Kwon is currently a Professor at the Division
of Mechanical Engineering at Sunmoon University in Chungnam, Korea. He serves as a chief of the Institute of Automation and
Energy Technology. Dr. Kwon’s research interests include heat exchanger, CO2 cycle, heat pump, and energy recovery ventilator for HVAC&R.
Mr. Dae-Hoon Kim is currently Doctoral student at the Mechanical Engineering from Hanyang University in Seoul, Korea. His research topics
include experimental and numerical of CO2 heatpump system. He has conducted a study on the Analysis of Refrigerating & Air-Conditioning Equipment Industry and Its
Forecasting Supervising and Testing for Performance of Refrigerator, Freezer and Air-Conditioner.
Prof. Jae-Heon Lee received his B.S. degree in Mechanical Engineering from Seoul National University, Korea, in 1971. He then received his M.S.
and Ph. D. degree from Seoul National University in 1977 and 1980, respectively. Dr. Lee is currently a Professor at the school
of Mechanical Engineering at Hanyang University in Seoul, Korea. Dr. Lee is currently a president at the Korea Institute research
interests include simulation of thermal fluid and Plant engineering and construction.
Dr. Jun-Young Choi received his B.S. degree in Mechanical Engineering from Yonsei University, Republic of Korea, in 1989. He then received his
M.S. and Ph. D. degrees from Yonsei University in 1991 and 1999, respectively. Dr. Choi is currently a chief researcher with
the 18 years experience on the energy performance testing of HVAC/R product. He is now assigned to the Energy Technology Center
at Basic Industry Division at Korea Testing Laboratory. He has been involved in the development of Design and Manufacturing
Technology for Air-Conditioner E.E.R. and Performance Testing Equipment for Cooling and Heating System with Non-CFCs, and
natural refrigerants. He has conducted a study on the Analysis of Refrigerating & Air-Conditioning Equipment Industry and
Its Forecasting Supervising and Testing for Performance of Refrigerator, Freezer and Air-Conditioner.
Dr. Sang Jae Lee received his Ph.D. degree in Mechanical Engineering from Hanyang University, KOREA, in 2008. Dr. Lee is currently a Researcher
at the Korea Institute of Industrial Technology in Cheonan, Korea. Dr. Lee’s research interests CO2 heatpump system, liquid desiccant air conditioning system and Micro heat exchanger. 相似文献
3.
Seung Man Eom Bum Suk Kim Hong Hee Yoo 《Journal of Mechanical Science and Technology》2008,22(11):2163-2170
A general multi-body formulation to analyze the tolerance effects on the statistical property variations of natural frequencies
of multi-body systems undergoing constant rotational motion is proposed in this paper. To obtain the tolerance effects, Monte-Carlo
simulation method is conventionally employed. However, the Monte-Carlo simulation has serious drawbacks; spending too much
computation time for the simulation and achieving very slow convergence around some dynamically unstable regions. To resolve
such problems, a method employing analytical sensitivity information is suggested in this paper. To obtain the sensitivities
of natural frequencies the eigenvalue problem should be differentiated with respect to a design variable. The sensitivities
of mass and stiffness matrices should be calculated at the dynamic equilibrium. By employing the sensitivities of natural
frequencies along with the tolerance of the design variable, the statistical property variations of the natural frequencies
can be calculated.
This paper was recommended for publication in revised form by Associate Editor Seockhyun Kim
Seung Man Eom graduated from the Department of Mechanical Engineering at Incheon University in 2005 and received his master degree from
the Department of Mechanical Engineering at Hanyang University in 2007. He is currently working as a Researcher of Aircraft
Development Team in KIAT(Korea Institute of Aerospace Technology, Koreanair), DaejeonDeajeon, Korea.
Bum Suk Kim graduated from the School of Mechanical Engineering at Hanyang University in 2006 and received his master degree from the
same department in 2008. He is currently working as a Ph.D. student in the School of Mechanical Engineering in Hanyang University,
Seoul, Korea.
Hong Hee Yoo graduated from the Department of Mechanical Design and Production Engineering at Seoul National University in 1980 and received
his master degree from the same department in 1982. He received his Ph.D. degree in 1989 from the Department of Mechanical
Engineering and Applied Mechanics in the University of Michigan at Ann Arbor, U.S.A. He is currently working as a professor
in the School of Mechanical Engineering in Hanyang University, Seoul, Korea. 相似文献
4.
The demand for the use of 3D CAD data over the Internet environment has been increasing. However, CAD data size has deteriorated
the communication effectiveness of 3D CAD files. Good design methodology of a lightweight CAD file is required for rapid transmission
on the distributed network environment. In this paper, a file translation system is constructed to produce lightweight CAD
files from commercial CAD systems by using InterOp and APIs of the ACIS kernel. Using B-rep models and mesh data extracted
from the CAD native files, the lightweight CAD files with topological information are constructed as binary files. As the
lightweight CAD files retain topological and geometric information, they are applicable to dimensional verification, digital
mock-ups, and visualization of CAD files through a CAD viewer. The effectiveness of the proposed lightweight CAD files is
confirmed through various case studies on the CAD viewer.
This paper was recommended for publication in revised form by Associate Editor Jooho Choi
In-Ho Song received B.S. and M.S. degrees in mechanical engi-neering from Kunsan National University, and Ph.D. degree in mechanical
engineering from Hanyang University, Seoul, Korea in 2007. From 2002 to 2007, he served as a team manager to develop CAD and
PLM systems in CIES in Korea. He is currently a post-doc researcher in the mechanical engineering department in Hanyang University.
As he had developed a lightweight CAD viewing kernel for CAD/CAM systems, he received a New Technology Certificate from Korean
Government (MOCIE) in 2005. He also received several prizes from the Korean Society of CAD/CAM Engineers in 2003 and 2004.
He specializes in geometric modeling, CAD kernels, product design and digital manufacturing systems.
Sung-Chong Chung received the B.S. degree with honors in mechanical engineering from Hanyang University, Seoul, Korea, and the M.S. and Ph.
D. in mechanical engineering from KAIST, Seoul, Korea in 1979, 1981 and 1987, respectively. Since 1983, he has been a professor
in the School of Mechanical Engineering, Hanyang University, Seoul, Korea. In 2000, he received the outstanding paper award
from the North American Manufacturing Research Institution of the Society of Manufacturing Engineers. He received the academic
research and software development awards from the Korean Society of Mechanical Engineers and the Korean Society of CAD/CAM
Engineers in 2003 and 2004, respectively. His research interests include CAD/CAM, control, mechatronics, manufacturing and
precision engineering. 相似文献
5.
Changhee Kim Mansoo Lee Cheolheui Han 《Journal of Mechanical Science and Technology》2008,22(12):2534-2541
The hydraulic transport characteristics of sand-water mixtures in circular and square pipelines are experimentally investigated
by changing the Reynolds number and volumetric delivered concentration. The hydraulic gradients are increased along with the
Reynolds number. When the mean velocity is larger than the critical velocity, the hydraulic gradient of sand-water mixture
in the square duct is larger than that in the circular pipe. The deposition-limit velocity in the square duct is smaller than
that in the circular pipe. Thus, it can be concluded that the square duct transports sands more effectively than the circular
pipe in a low operating range of velocity. The empirical correlation between the hydraulic gradient and the Reynolds number
is obtained. It is believed that the present data and empirical equation can be used to validate the numerical methods developed
for the analysis of the transport characteristics of slurry in the circular and square pipelines.
This paper was recommended for publication in revised form by Associate Editor Jun Sang Park
Chang-Hee Kim received a B.S. degree in Mechanical Engineering from Hanyang University in 1985. He then went on to receive his M.S. degrees
from Hanyang University in 1994. Mr. Kim has joined Hyundai Engineering and Construction Company after his degree and is currently
working for Oil & Gas Plant as a Procurement Manager.
Man-Soo Lee received his M.S. and Ph.D. degrees from civil eng. dept. of Seoul National University in 1992 and 2004, respectively. He
has joined Hyundai Engineering and Construction company since 1991 as a research engineer. Recently assisting a big dredging
& reclamation project of Hyundai near Incheon Airport in Korea, he is responsible for the geotechnical researching team of
civil engineering division at Hyundai Institute of Construction Technology.
Cheol-Heui Han received a B.S. degree in Mechanical Engineering from Hanyang University in 1993. He received his M.S. and Ph.D. degrees
from Hanyang University. in 1998 and 2003, respectively. Then, he worked as a visiting post-doctoral researcher at the Dept.
of Aerospace and Ocean Engineering at Virginia Tech, USA. Dr. Han is currently a Assistant Professor at the Department of
Aeronautical and Mechanical Design Engineering. Dr. Han’s research interests are in the area of biomimetics, aircraft and
turbomachine design. 相似文献
6.
Taewoong Lim Jaeik Jeong Jaewon Chung Jin Taek Chung 《Journal of Mechanical Science and Technology》2009,23(7):1788-1794
In this work, the evaporation phenomena of 20–45 picoliter water droplet (i.e. 50–65 μm diameter) on heated substrates with
different thermal conductivity are studied experimentally. The effect of thermal conductivity of substrates and inter-distance
between jetted droplets on the evaporation is investigated. In addition, the model to predict evaporation rate of the picoliter
droplet on different substrates at a heated condition is developed using approximations for picoliter droplet.
This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008.
Taewoong Lim received his B.S and M.S. degree in mechanical engineering from Korea University, Seoul, Korea in 2007 and 2009, respectively.
His thesis topic was the evaporation of inkjet printed pico-liter droplet and He has been working at Hyundai Motor Company.
Jaeik Jeong received his B.S. degree in mechanical engineering from Korea University in 2008. He is currently a M.S. candidate in mechanical
engineering at Korea University.
Jaewon Chung received his B.S. and M.S. degrees in mechanical engineering from Yonsei University, Seoul, Korea in 1995 and 1997, respectively
and Ph.D. degree from University of California, Berkley in 2002. He was postdoctoral associate in Engineering System Research
Center at University of California, Berkley in 2002–2004 and had worked in the Center of Micro and Nano Technology at Lawrence
Livermore National Laboratory as a visiting collaborator. He is a currently an associate professor at the Department of Mechanical
Engineering at Korea University in Seoul, Korea. His research interests include direct writing methods including drop on demand
inkjet printing, electrohydrodynamic printing and laser material processing for printing electronics.
Jin Taek Chung received his B.S. and M.S. degrees in mechanical engineering from Korea University, Seoul, Korea in 1983 and 1985, respectively
and Ph. D. degree from University of Minnesota, U.S.A. in 1992. He is a currently a professor at the Department of Mechanical
Engineering at Korea University in Seoul, Korea. His research interests are heat transfer and 3-D flow in gas turbines and
thermal management of electronic devices. 相似文献
7.
Insu Paek Luc Mongeau James E. Braun Shin You Kang 《Journal of Mechanical Science and Technology》2009,23(5):1476-1484
Investigations on the relations between the phase angle of the acoustic impedance at the driver piston and the system performance
of a standing wave thermoacoustic cooler were performed. The system performance measured at a fixed acoustic power showed
that the coefficient of performance of the standing wave thermoacoustic cooler increases as the phase angle increases when
the stack temperature span is relatively low. The results were consistent with the simulation results obtained from DELTAE,
a computer code based on linear thermoacoustic theory. Analysis on the temperature profiles along the stack showed that the
cooling efficiency (COP) of the system could be decreased or increased as the phase angle of the acoustic impedance at the
driver piston changes depending on the stack temperature spans.
This paper was recommended for publication in revised form by Associate Editor Yeon June Kang
Insu Paek received the B.S. degree in Mechatronics Engineering from Kangwon National University, Chuncheon, Korea, in 1997, the M.S.
degree in Mechanical Engineering from the University of Texas at Austin, USA, in 2000, and the Ph. D. degree in Mechanical
Engineering from Purdue University, West Lafayette, USA, in 2005. He worked as a postdoctoral researcher in Purdue University
and McGill University in 2006 and 2007. He is currently a faculty member in the Department of Mechatronics Engineering, Kangwon
National University, Chuncheon, Korea. His research interests include thermoacoustic cooling and power generation, solar heat
driven absorption cooling., and wind power.
Luc Mongeau received the B.S. and M.S. degrees in mechanical engineering from the University of Montreal, QC, Canada, in 1984 and 1986,
respectively, and the Ph. D. degree in Acoustics from Pennsylvania State University, University Park, USA, in 1990. He is
currently a professor in the Department of Mechanical Engineering at McGill University, Montreal, QC, Canada. He has published
over 50 archival journal publications on various topics related to acoustics and noise control. His research activities are
in the flow and turbomachinery noise areas, as well as in the areas of voice production, and thermoacoustic refrigeration.
James E. Braun received the B.S. degree in Mechanical Engineering from the University of Massachusetts, USA, in 1976, and the M.S. and Ph.
D. degrees in Mechanical Engineering from the University of Wisconsin, Madison, USA, in 1980 and 1988, respectively. He is
currently a professor in the Department of Mechanical Engineering, Purdue University, West Lafayette, USA. Professor Braun’s
research combines the use of computer modeling, optimization, and experiments to study and improve the performance of thermal
systems. He has published over 140 papers. Professor Braun is currently an associate editor for the international journal
of HVAC&R Research.
Shin You Kang received the B.S. and M.S. degrees in the Department of Mechanical Design from Seoul National University, Seoul, Korea, in
1982, and 1986, respectively. He then received the Ph.D. in Mechanical Engineering at the same university in 1992. Professor
Kang is currently a professor in the Department of Mechatronics Engineering, Kangwon National University, Chuncheon, Korea.
His research interests include mechanical structure design, crash analysis, optimal design, computational structure analysis
and evaluation. 相似文献
8.
Kwang-Chu Kim Jong-Han Lim Jun-Kyu Yoon 《Journal of Mechanical Science and Technology》2008,22(11):2218-2227
The scheme and procedure for thermal fatigue estimation of a thermally stratified branch line were developed. One-way FSI
(fluid and structure interaction) scheme was applied to evaluate the thermal stratification piping. Thermal flow analysis,
stress analysis and fatigue estimation were performed in serial order. Finally, detailed monitoring locations and mitigation
scheme for the integrity maintenance of piping were recommended. All wall mesh and transient temperature distribution data
obtained from the CFD (computational fluid dynamics) analysis were directly imported into the input data of stress analysis
model without any calculation for heat transfer coefficients. Cumulated usage factors for fatigue effect review with nodes
were calculated. A modified method that combines ASME Section III, NB-3600 with NB-3200 was used because the previous method
cannot consider the thermal stratification stress intensity. As the results of evaluation, the SCS (shutdown cooling system)
line, branch piping of the RCS (reactor coolant system) line, shows that the CUF (cumulative usage factor) value exceeds 1.0,
ASME Code limit, in case thermal stratification load is included. The HPSI (high pressure safety injection) line, re-branch
piping, shows that temperature difference between top and bottom of piping exceeds the criterion temperature, 28°C, and that
the CUF value exceeds 1.0. Therefore, these branch pipings require a detailed review, monitoring or analysis. In particular,
it is recommended that the HPSI piping should be shifted backward to decrease the influence of turbulent penetration intensity
from the RCS piping.
This paper was recommended for publication in revised form by Associate Editor Jae Young Lee
Kwang-Chu Kim received his B.S., M.S. and Ph.D degrees from department of mechanical engineering, Kyunghee University in 1993, 1995 and
2000, respectively. He has worked for Korea Power Engineering Company since 1995 and he is now a senior researcher. Dr. Kim’s
research area includes CFD analysis, flow control, plant design and simulator.
Jong-Han Lim received his B.S. degree from department of mechanical engineering, Chosun University in 1981, M.S. and Ph.D degrees from
department of mechanical engineering, Kyunghee University in 1986 and 1992, respectively. He worked for Hyundai Motors Company
during 1986-95. He is now a professor in department of mechanical & automotive engineering, Kyungwon University. Dr. Lim’s
research interests are in the area of thermal flow, internal combustion and liquid atomization.
Jun-Kyu Yoon received his B.S. degree from department of mechanical engineering, Chosun University in 1981, M.S. degree from department
of mechanical engineering, Kyunghee University in 1987 and Ph.D degree from department of mechanical engineering, Myongji
University in 2001. He worked for Hyundai Motors Company and Asia Motors Company during 1985–96. He is now a professor in
department of mechanical & automotive engineering, Kyungwon University. Dr. Yoon’s research interests are in the area of flow
control, heat transfer, liquid atomization, spray and combustion. 相似文献
9.
Jung Kwan Lee Sang Bong Lee Hyungpil Moon Dongho Oh J. C. Koo 《Journal of Mechanical Science and Technology》2009,23(4):1050-1053
Even a moderate mass imbalance of a high-precision rotor produces a significant level of vibration when it spins at high revolutionary
speed such as 10,000 rpm or faster. As a result, many attempts have been made for the development of dynamic rotor balancing
methods mostly by the precision mechanical system industry; however, intensive studies about the fundamental principles from
a theoretical point of view should be carried out further. In the present paper, a new dual axes dynamic imbalance correction
method is introduced and tested through simulations. The proposed method is more efficient and effective than its predecessors.
This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008.
Jung Kwan Lee is currently a masteral student in the School of Mechanical Engineering at Sungkyunkwan University Korea. He received his
B.S. degree from Sungkyunkwan University. His primary research interests are rotor design, analysis, and rotor dynamics.
Hyungpil Moon received his Ph.D. degree in mechanical engineering from the University of Michigan in 2005. He was a postdoctoral fellow
at Carnegie Mellon University. He joined the faculty of the School of Mechanical Engineering at Sungkyunkwan University in
2008.
Dongho Oh received his Ph.D. degree from KAIST in 1996. He worked as a Principal En-gineer of Samsung Electronics and SAIT. Dr. Oh
is currently an Associate Professor at the Department of Mechanical Engineering at Chungnam National University.
Ja Choon Koo is an associate professor of the School of Mechanical Engineering at Sungkyunkwan University Korea. He was an engineer at
IBM Corporation, San Jose, California. He received his Ph.D from the University of Texas at Austin. His primary research interests
are analysis, and control of dynamic systems, mechatronics, sensors, and actuators. 相似文献
10.
Hyunwoo Bang Won Gu Lee Junha Park Hoyoung Yun Junggi Min Dong-Chul Han 《Journal of Mechanical Science and Technology》2009,23(5):1500-1507
This paper presents a novel method of optimizing particle-suspended microfluidic channels using genetic algorithms (GAs).
The GAs can be used to generate an optimal microchannel design by varying its geometrical parameters. A heuristic simulation
can be useful for simulating the emergent behaviors of particles resulting from their interaction with a virtual microchannel
environment. At the same time, fitness evaluation enables us to direct evolutions towards an optimized microchannel design.
Specifically, this technique can be used to demonstrate its feasibility by optimizing one commercialized product for clinical
applications such as the microchannel-type imaging flow cytometry of human erythrocytes. The resulting channel design can
also be fabricated and then compared to its counterpart. This result implies that this approach can be potentially beneficial
for developing a complex microchannel design in a controlled manner.
This paper was recommended for publication in revised form by Associate Editor Hong Hee Yoo
Hyunwoo Bang was born in Korea on June 2, 1978. He received the B.S. degree in mechanical and aerospace engineering from Seoul National
University, Seoul, Korea in 2001 and the Ph.D. degree in mechanical and aerospace engineering from Seoul National University
in 2007. He did postdoctoral research at University of California Los Angeles, CA that involved the integration of functional
biological components into engineered devices with Prof. Jacob J. Schmidt from April 2007 to August 2008. His current research
interests include microfluidics based Lab-on-a-chip devices and their design optimization using artificial intelligence.
Dong-Chul Han received the B.S. degree from the Department of Mechanical Engineering, Seoul National University, Seoul, Korea, in 1969,
and the Dipl.-Ing. and Dr.-Ing. degrees from the Department of Mechanical Engineering, University of Karlsruhe, Karlsruhe,
Germany, in 1975 and 1979, respectively. He also received the Habilitation from the Department of Mechanical Engineering,
University of Karlsruhe. He had been a professor in the school of Mechanical and Aerospace Engineering at Seoul National University
from 1982 to 2008. His research interests include active magnetic bearing systems, mechanical lubrication, Bio-MEMS (MicroElectroMechanical
Systems) and nano-fabrication. 相似文献
11.
Byeong-Soo Kim Yong-Bin Lee Dong-Hoon Choi 《Journal of Mechanical Science and Technology》2009,23(4):1175-1181
In order to increase the efficiency of design optimization, many efforts have been made on studying the metamodel techniques
for effectively representing expensive and complex models. In this study, a comparison is conducted on the accuracy of several
widely used meta-model techniques — moving least squares (MLS), Kriging, support vector regression (SVR) and radial basis
functions (RBF) — which are able to approximate non-convex functions well. RMSE (root mean squared error) value is identified
as a measure of the accuracy for this comparison. Each metamodel technique is used to approximate the six well-known mathematical
functions and a resign of experiment (DOE) is generated by using the Latin hypercube design (LHD), which is also performed
for each resulting metamodel. The results show that Kriging and MLS can create a more accurate metamodel than SVR and RBF
with the mathematical functions tested.
This paper was recommended for publication in revised form by Associate Editor Dae-Eun Kim
Byeong-Soo Kim received B.S and M.S. degree in Mechanical Engineering from Hanyang University in 2006 and 2008, respectively. Mr. Kim is
currently a Research Engineer at LG Electronics.
Yong-Bin Lee received a B.S. and M.S. degree in Mechanical Engineering from Hanyang University in 2002 and 2004, respectively. He is currently
a Ph.D. student in Hanyang University. Mr. Lee’s research interests are in the area of optimization, approximation, and design
of experiments.
Dong-Hoon Choi received a B.S. degree in Mechanical Engineering from Seoul National University in 1975. He then went on to receive his M.S.
from KAIST in 1977 and Ph. D. degree from University of Wisconsin-Madison in 1986, respectively. Dr. Choi is currently a Professor
at the School of Mechanical Engineering at Hanyang University in Seoul, Korea. He is currently the director of iDOT(the center
of innovative design optimization technology). Prof. Choi’s research interests are in the area of optimization techniques:
developing MDO methodology, developing optimization techniques to ensure a reliability of optimum solution, and developing
approximation optimization technique, etc. 相似文献
12.
A modeling method for the modal analysis of a multi-blade system undergoing rotational motion is presented in this paper.
Blades are assumed as cantilever beams and the coupling stiffness which originates from the shroud flexibility is considered
for the modeling. To obtain general conclusions from the numerical results, the equations of motion are transformed into a
dimensionless form. Dimensionless parameters related to the angular speed, the hub radius, and the coupling stiffness are
identified and the effects of the parameters on the modal characteristics of the system are investigated. It is shown that
the coupling stiffness especially plays an important role to change the modal characteristics of the system. The range of
critical angular speed is also obtained through the numerical analysis.
This paper was recommended for publication in revised form by Associate Editor Seockhyun Kim
Ha Seong Lim graduated from Department of Mechanical Engineering at Hanyang University in 2006 and received his Master’s degree in 2008.
He is currently a technical engineer in STX Offshore & Shipbuilding Company, Seoul, Korea.
Hong Hee Yoo graduated from the Department of Mechanical Design and Production Engineering at Seoul National University in 1980 and received
his Master’s degree from the same department in 1982. He received his Ph.D. degree in 1989 from the Department of Mechanical
Engineering and Applied Mechanics at the University of Michigan at Ann Arbor, U.S.A. He is currently a professor in the School
of Mechanical Engineering in Hanyang University, Seoul, Korea. 相似文献
13.
Seung-chai Jung Byung-Hoon Park Hyun Ko Woong-sup Yoon 《Journal of Mechanical Science and Technology》2009,23(3):823-835
Effects of the bulk inlet velocity on the characteristics of dual-inlet side-dump flows are numerically investigated. Non-reacting
subsonic turbulent flow is solved by a preconditioned Reynolds-averaged Navier-Stokes equation system with low-Reynolds number
k − ɛ turbulence model. The numerical method is properly validated with measured velocity distributions in the head dome and the
combustor. With substantial increase in the bulk inlet velocity, general profiles of essential primary and secondary flows
normalized by the bulk inlet velocity are quantitatively invariant to the changes in the bulk inlet velocity.
This paper was recommended for publication in revised form by Associate Editor Do Hyung Lee
Seung-chai Jung received his B.S. degree in Mechanical Engineering from Yonsei University, Korea, in 2001. He then received his M.S. degree
in Mechanical Engineering from Yonsei University, Korea, in 2005. Mr. Jung is currently a Ph. D. candidate at Yonsei University,
where he is majoring in Mechanical Engineering. Mr. Jung’s research interests include propulsion system and particle-surface
collision dynamics.
Byung-Hoon Park received his B.S. degree in Mechanical Design and Production Engineering from Yonsei University in 2003. He is currently
a Ph.D. candidate in Yonsei University in Seoul, Korea. His research interests include performance design of propulsion systems
and nu-merical analysis of instability in multiphase turbulent reacting flow-fields.
Hyun Ko received his B.S. degree in Aerospace Engineering from Chonbuk National University, Korea, in 1996. He then received his
M.S. degree in Mechanical Design from Chonbuk National University, Korea, in 1998. In 2005, he obtained his Ph.D. degree from
Yonsei University, where he majored in mechanical engineering. Dr. Ko is currently a Principal Research Engineer of the MicroFriend
Co., Ltd. in Seoul, Korea. His research interests include propulsion related systems and computational fluid dynamics.
Woong-sup Yoon received his B.S. degree in Mechanical Engineering from Yonsei University, Korea, in 1985. He then received his M.S. degree
from University of Missouri-Rolla in 1989. In 1992, he obtained his Ph.D. degree from the University of Alabama in Huntsville,
where he majored in mechanical and aerospace engineering. Dr. Yoon is currently a professor at the School of Mechanical Engineering
at Yonsei University in Seoul, Korea. His research interests include propulsion system and particle-related environmental/
thermal engineering. 相似文献
14.
Bum Suk Kim Maksym Spiryagin Bong Soo Kim Hong Hee Yoo 《Journal of Mechanical Science and Technology》2009,23(4):960-963
In the design process of an automobile part, several analysis methods are usually used to evaluate the performance of the
part. However, most automobile design engineers do not directly use CAE (computer aided engineering) tools since specific
skills are required to obtain practical results. Moreover, CAE requires a huge amount of computation time and cost. To resolve
these problems, a new design approach, termed first order analysis (FOA), has been proposed. In this paper, the FOA technique
is employed to design a vehicle sub-frame. An equivalent model of the vehicle subframe which only consists of beam elements
is proposed and the modal properties obtained with the model are compared to those obtained with a full scale finite element
model. The effects of some parameter variations on the modal characteristics of the vehicle sub-frame are investigated by
employing the FOA equivalent model.
This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008.
Hong Hee Yoo graduated from the Department of Mechanical Design and Production Engineering at Seoul National University in 1980 and received
his Master’s degree from the same department in 1982. He received his Ph.D. degree in 1989 from the Department of Mechanical
Engineering and Applied Mechanics at the University of Michigan at Ann Arbor, U.S.A. He is currently working as a professor
in the School of Mechanical Engineering in Hanyang University, Seoul, Korea. 相似文献
15.
Kwang Hoon Park Kang Mo Yang Keon Woo Lee Hyung Hee Cho Hee Chul Ham Ki Young Hwang 《Journal of Mechanical Science and Technology》2009,23(7):1852-1857
A slot film cooling technique has been used to protect a combustor liner from hot combustion gas. This method has been developed
for gas turbine combustors. A ramjet combustor exposed to high temperature can be protected properly with a multi-slot film
cooling method. An experimental study has been conducted to investigate the change of the first slot angle under recirculation
flow and the influence of wiggle strip within a slot, which affects the film cooling effectiveness. The first slot angle has
been changed to understand the effect of the injection angle on the film cooling effectiveness in a recirculation zone. The
distribution of dimensionless temperature was obtained by a thermocouple rake to investigate the wiggle strip effect, and
the adiabatic film cooling effectiveness on downstream wall was measured by a thermochromic liquid crystal (TLC) method. At
the first slot position, the film cooling effectiveness decreases significantly because of the effects of recirculation flow.
The lip angle of the first slot affects slightly on the film cooling effectiveness. The wiggle strip reinforces the structure
of slot and keeps the uniform open area of slot. However, it induces three dimensional flows and enhances the flow mixing
between the main flow and the injected slot flow. Therefore, the wiggle strip decreases slightly the overall film cooling
effectiveness.
This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008.
Kwanghoon Park received his M.S degree in Mechanical Engineering from Yonsei University, Seoul, Korea in 2007. He is currently working for
an education of an officer as a drillmaster in Army Consolidated Logistics School.
Kang Mo Yang joined the Republic of Korea Army in 2004. He is currently working towards the M.S. degree at the Department of Mechanical
Engineering, Yonsei University.
Keon Woo Lee received his M.S. degree in Mechanical Engineering from Yonsei University, Seoul, Korea in 2008. In 2008, he joined the Doosan
heavy industries & Construction Co, LTD, where he is a member of the IGCC Business Team.
Hyung Hee Cho received his PhD degree in Mechanical Engineering from University of Minnesota, Minneapolis, MN in 1992. In 1995, he joined
the Department of Mechanical Engineering, Yonsei University, Seoul, Korea, where he is currently a full professor in the School
of Mechanical Engineering. His research interests include heat transfer in turbomachineries, rocket/ramjet cooling as well
as nanoscale heat transfer in thin films, and microfabricated thermal sensors.
Hee Cheol Ham received his PhD degree in Mechanical Engineering from Yonsei University, Seoul, Korea in 2001. In 1984, he joined the Agency
for Defense Development, Daejeon, Korea, where he is currently a Principal Researcher.
Ki Young Hwang received his Ph.D. degree in Mechanical Engineering from Yonsei University, Seoul, Korea in 1994. In 1979, he joined the
Agency for Defense Development, Daejon, Korea, where he is currently a principal researcher in the Airbreathing Propulsion
Directorate. 相似文献
16.
Katsuki Masashi Chung Jin-Do Kim Jang-Woo Hwang Seung-Min Kim Seung-Mo Ahn Chul-Ju 《Journal of Mechanical Science and Technology》2009,23(3):614-623
Combustion in high-preheat and low oxygen concentration atmosphere is one of the attractive measures to reduce nitric oxide
emission as well as greenhouse gases from combustion devices, and it is expected to be a key technology for the industrial
applications in heating devices and furnaces. Before proceeding to the practical applications, we need to elucidate combustion
characteristics of non-premixed and premixed flames in high-preheat and low oxygen concentration conditions from scientific
point of view. For the purpose, we have developed a special mixing nozzle to create a homogeneous mixture of fuel and air
by rapid mixing, and applied this rapidmixing nozzle to a Bunsen-type burner to observe combustion characteristics of the
rapid-mixture. As a result, the combustion of rapid-mixture exhibited the same flame structure and combustion characteristics
as the perfectly prepared premixed flame, even though the mixing time of the rapid-mixing nozzle was extremely short as a
few milliseconds. Therefore, the rapid-mixing nozzle in this paper can be used to create preheated premixed flames as far
as the mixing time is shorter than the ignition delay time of the fuel.
This paper was recommended for publication in revised form by Associate Editor Ohchae Kwon
Masashi Katsuki received his B.E. degree in Mechanical Engineering from Osaka University, Japan, in 1965. He received his Dr. Eng. from O.
U. in 1985. Dr. Katsuki is currently a Visiting Professor at the Department of Environmental Engineering at Hoseo University
in Chungnam, Korea. He was a Vice President of the Japan Society of Mechanical Engineers. Dr. Katsuki’s research interests
include combustion, computational thermo-fluid dynamics, and molecular dynamics.
Jin-Do Chung received his B. S., M.S. and Ph.D. degrees in Mechanical Engineering from Chungnam University, Korea in 1983, 1985 and 1990.
He then received another Ph.D. in Environmental Engineering from Kanazawa University, Japan in 1996. After that he worked
as Post-doc researcher for 1,6 year at KIMM and Senior researcher for 6years at KEPCO Research Center. Dr. Chung is currently
a Professor at the Department of Environmental Engineering at Hoseo University in Asan, Korea. Dr. Chung’s research interests
include thermal-fluid and environmental engineering.
Jang-Woo Kim received his B. S. degree in Mechanical Engineering from Chungnam University, Korea, in 1990. He then received his M. S.
and Ph. D. degrees from Kyushu University, Japan in 1994 and 1998, respectively. Dr. Kim is currently a Professor at the School
of Display Engineering at Hoseo University in Asan, Korea. Dr. Kim’s research interests include CFD, aerodynamics, and display
equipment technology.
Seung-Min Hwang received the Ph.D. degree in Mechanical Engineering at Osaka University in 2005. After that he worked as visiting researcher
for 3 years at CRIEPI (central research institute of electric power industry) and Osaka University in Japan. He is currently
a Professor at the Graduate School of Venture at Hoseo University in Korea. His major research is thermal-fluid, energy issue
and environment.
Seung-Mo Kim received his Ph. D. degrees in Mechanical engineering from Osaka University, Japan, in 2004. Dr. Kim is currently a research
Professor at Pusan Clean Coal Center at Pusan National University in Pusan, South Korea. Dr. Kim’s research interests include
coal combustion, oxy-fuel combustion, coal gasification, coal de-watering, power generation plant system and energy issues.
Chul-Ju Ahn received his B.S. degree in Mechanical Engineering from Hanyang University, Korea, in 1998. He then received his M.S. and
Ph.D. degrees from Osaka University, Japan, in 2001 and 2006, respectively. Dr. Ahn is currently a Senior Research Engineer
at Samsung Techwin CO. LTD. in Changwon, Korea. Dr. Ahn’s research interests include gas turbine engine, biomass gasification,
and power system. 相似文献
17.
László Baranyi Szilárd Szabó Betti Bolló Róbert Bordás 《Journal of Mechanical Science and Technology》2009,23(7):1829-1834
The objective of this study is to investigate the forced convection from and the flow around a heated cylinder. Experimental
and computational results are presented for laminar flow around a heated circular cylinder with a diameter of 10 mm. The experiments
were carried out using Particle Image Velocimetry (PIV) in a wind tunnel, and numerical simulations using an in-house code
and a commercial software package, FLUENT. This paper presents comparisons for vorticity and temperature contours in the wake
of the cylinder. Experimental and computational results are compared with those available in the literature for heated and
unheated cylinders. An equation is suggested for a temperature-dependent coefficient defining a reference temperature to be
used in place of the constant used in other studies. An attempt is also made to correct differences between average cylinder
surface temperature and measured interior temperature of the cylinder.
This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008.
László Baranyi received his MEng degree from the Technical University for Heavy Industry, Hungary, in 1975 and his PhD in 1990. He worked
as an associate professor at Nagaoka University of Technology, Japan, from 1995 to 1997. Dr. Baranyi is currently an associate
professor at the University of Miskolc, Hungary. He serves as an editor of the Journal of Computational and Applied Mechanics.
His research interests include bluff body aerodynamics and fluid-structure interaction.
Szilárd Szabó, PhD (1995, University of Miskolc), professor, head of Department of Fluid and Heat Engineering University of Miskolc, Hungary.
He earned his MSc degree in mechanical engineering in 1975 from the Technical University for Heavy Industry. He serves as
an editor of the Journal of Computational and Applied Mechanics and a deputy editor-in-chief of the Hungarian journal GéP.
Dr. Szabó’s research fields are supersonic gas ejectors, turbomachines, CFD, power engineering.
Betti Bolló, assistant at the Department of Fluid and Heat Engineering, University of Miskolc, Hungary. She received her MSc degree from
the University of Miskolc in Information Engineering (Systems of Power Engineering) in 2003. Ms Bolló’s research interests
include CFD and internal combustion engines.
Róbert Bordás, PhD student at the Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg “Ottovon-Guericke” in Germany.
He received his MSc degree from the Budapest University of Tech-nology in Integrated Engineering (Faculty of Mechanical Engineering)
in 2005. His research interests include optical measurements in engineering flows. 相似文献
18.
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
19.
Sang-Gil Park Hyoun-Jin Sim Hae-Jin Lee Jae-Eung Oh 《Journal of Mechanical Science and Technology》2008,22(11):2122-2133
Although Fourier-based methods have been standard methods for frequency analysis, they are not well suited for the analysis
of nonlinear or non-stationary systems due to their time-varying natures. Thus, in this paper, a wavelet packet-based technique,
which calculates time-varying coherence functions for input/output relationships, is developed. The developed method uses
the Coiflet wavelet that has been widely used in signal processing. It is applied to obtain the time-varying coherence function,
and to detect the impulse signal from the impulse-embedded signal such as an automobile sound/vibration signal with an external
impact caused by a collision or passing over rough terrain. Some characteristics of non-stationary behavior such as the wavelet
packet coefficients, maximum phase plane (MPP) analysis and fault detection are also demonstrated. The method gives promising
results of non-stationary input-output systems, and so may be used as an effective tool for condition monitoring or fault
detection area.
This paper was recommended for publication in revised form by Associate Editor Yeon June Kang
Jae-Eung Oh received his B.S. degree of mechanical engineering at Hanyang University in 1975 and his M.S. degree of Safety Engineering
at Yokohama National University in 1980. He then went on to receive his doctorate degree in environmental engineering from
Tokyo Institute of Technology in 1983. He is currently the Vice President of KSNVE. 相似文献
20.
Dae Hee Lee Myeong Chan Jo Jun Sik Lee Yoon Seok Cha Dae Keun Lee 《Journal of Mechanical Science and Technology》2009,23(2):544-549
Measurements of the temperature distributions of the cooling air flow inside a computer system have been made. An investigation
of the optimum cooling condition for the computer system has also been made. Seventy-one K-type (Chromega-Alumega) thermocouples
were used to measure distributions of the air flow temperature inside the computer system. They were calibrated against the
standard platinum resistance thermometer (PRT) in a constant water circulating bath within an accuracy of ± 0.15 °C. It was
found that the number and position of cooling fans as well as their operating condition, whether air intake or air discharge,
can greatly influence the cooling effectiveness in the computer system. The results show that the flow rate of intake air
should not be higher than that of the discharge air for the most effective cooling. It follows that the optimum cooling has
been achieved inside the computer when the three fans are positioned in the inlet front, outlet back, and outlet top in the
computer, respectively. Under these conditions, not only is the average temperature inside the computer system maintained
at an appropriate level, but the most effective cooling around the central processor (CPU) and graphic card which are responsible
for the largest amount of heat dissipation can be accomplished.
This paper was recommended for publication in revised form by Associate Editor Man-Yeong Ha
Dae Hee Lee received a B.S. degree in Mechanical Engineering from Hanyang University in 1984. He then went on to receive his M.S. and
Ph.D. degrees from University of California at Davis in 1984 and 1987, respectively. Dr. Lee is currently a Professor at the
School of Mechanical Engineering and a Dean of Academic Affairs at Inje University in Korea. Dr. Lee’s research interests
are in the area of Convection Heat Transfer, Liquid Crystal Thermography, Co-generation, and Renewable Energy. 相似文献