莱钢大H型钢腹板波浪产生的原因分析

针对H700X300、H800X300规格以及欧标规格出现的腹板波浪缺陷,从轧制工艺以及冷却工艺进行了原因分析,并提出了预防措施,使腹板波浪缺陷的数量降低95％。     

四足步行机器人腿机构及其稳定性步态控制

结合实际 ,详细地分析了四足步行机器人的步态和腿机构的运动关系 ,并在此基础上给出了四足步行机器人腿部机构和驱动控制方案。     

RESEARCH OF KINEMATIC CHARAC－TERISTICS FOR QUADRUPED WALKING VEHICLE WITH LEGS OF DIFFERENT DISPOSITIONS OF DOFS

ＲＥＳＥＡＲＣＨＯＦＫＩＮＥＭＡＴＩＣＣＨＡＲＡＣ－ＴＥＲＩＳＴＩＣＳＦＯＲＱＵＡＤＲＵＰＥＤＷＡＬＫＩＮＧＶＥＨＩＣＬＥＷＩＴＨＬＥＧＳＯＦＤＩＦＦＥＲＥＮＴＤＩＳＰＯＳＩＴＩＯＮＳＯＦＤＯＦＳＲＥＳＥＡＲＣＨＯＦＫＩＮＥＭＡＴＩＣＣＨＡＲＡＣ－Ｔ...     

掺粉煤灰、早强减水剂砼在桥梁立柱施工的应用效果

本文介绍了掺粉煤灰、高效早强减水剂混凝土在鸿尾大桥下部结构中的应用,阐述利用粉煤灰、高效早强减水剂优化混凝土配合比试验,以及在泵送施工技术和改善立柱表观质量方面的应用效果。     

The ergonomics of airplane seats: The problem with economy class

The increase in size (body mass and stature) and changing proportions of the human body over the past few decades should be considered in the ergonomic design of economy class airline seats. The aim of this study was to analyze the incongruity of the minimum space for seated passengers considering a group of Spanish adults. Thirteen variables were measured in a group of 201 females and 346 males. The results suggest a minimum leg room between 68.1 and 70.1 cm, and seat width between 50.2 and 52.3 cm. According to this study we can conclude that it is necessary to increase the minimum space in economy airline seats, specifically in terms of leg room and seat width.Relevance to industryThe increase in space of the economy class airline seats in the airline industry can be regarded as an important measure to reduce health risks, and improvement of comfort in the 21st century.     

Sensitivity analysis of the MASLWR helical coil steam generator using TRACE

Accurate simulation of transient system behavior of a nuclear power plant is the goal of systems code calculations, and the evaluation of a code's calculation accuracy is accomplished by assessment and validation against appropriate system data. These system data may be developed either from a running system prototype or from a scaled model test facility, and characterize the thermal hydraulic phenomena during both steady state and transient conditions. The identification and characterization of the relevant thermal hydraulic phenomena, and the assessment and validation of thermal hydraulic systems codes, has been the objective of multiple international research programs. The validation and assessment of the best estimate thermal hydraulic system code TRACE against the Multi-Application Small Light-Water Reactor (MASLWR) Natural Circulation (NC), helical coil Steam Generator (SG), Nuclear Steam Supply System (NSSS) design is a novel effort, and is the topic of the present paper. Specifically, the current work relates to the assessment and validation process of TRACE code against the NC database developed in the OSU-MASLWR test facility. This facility was constructed at Oregon State University under a U.S. Department of Energy grant in order to examine the NC phenomena of importance to the MASLWR reactor design, which includes an integrated helical coil SG. Test series have been conducted at this facility in order to assess the behavior of the MASLWR concept in both normal and transient operation and to assess the passive safety systems under transient conditions. In particular the test OSU-MASLWR-002 investigated the primary system flow rates and secondary side steam superheat, used to control the facility, for a variety of core power levels and Feed Water (FW) flow rates. This paper illustrates a preliminary analysis, performed by TRACE code, aiming at the evaluation of the code capability in predicting NC phenomena and heat exchange from primary to secondary side by helical SG in superheated condition and to evaluate the fidelity of various methods to model the OSU-MASLWR SG in TRACE. The analyses of the calculated data show that the phenomena of interest of the OSU-MASLWR-002 test are predicted by the code and that one of the reasons of the instability of the superheat condition of the fluid at the outlet of the SG is the equivalent SG model used to simulate the different group of helical coils. The SNAP animation model capability is used to show a direct visualization of selected calculated data.     

具有凹坑损伤的海洋平台桩腿有限元分析

采用有限元分析方法，将具有凹坑损伤的构件分割为三个子单元，分别对各子单元建立单元刚度矩阵，然后使用静凝聚法建立受损构件的等效梁和管单元刚度矩阵的计算方法。为检验方法的正确性，使用该方法对几种损伤构件进行强度计算，并与有限元细化网格计算结果和试验结果进行比较，结果表明，三种结果符合很好。最后，将等效单元计算程序接入Super SAP程序，对受损后的平台整体结构进行应力计算和强度分析。     

ANSYS在新型立柱设计中的仿真应用

运用ANSYS软件，依据欧洲CEN标准，对立柱进行偏载及中心载荷非线性有限元仿真分析，从而优化设计和改型，提高设计的可靠性。     

由试验推算燃气流冲击力

通过测量火箭弹发射状态下，发射装置受燃气流动的冲击时支腿和俯仰油缸的受力变化，运用支腿受力计算公式计算在某一设定的燃气流冲击力作用下支腿的受力值，与试验值相比较，如果两者差值在规定的精度范围内，则认为该设定的燃气流冲力，即为作用到发射装置上的燃气流冲击力；运用能量守恒原理，利用测得的俯仰油缸冲击力增量，导出俯仰系统的扰动角速度，进而推算出燃气流的冲击力。     

基于AVR单片机的智能功率因数在线监测仪

介绍一种由新型AVR单片机构成的电力系统功率因素在线监测仪，该仪器利用单片机软件来判定功率因数超前或滞后，并可在线监测功率因数的大小，具有硬件结构简单，系统可靠性高等优点。