连续式裹包机补偿机构的运动分析

分析了连续式裹包机补偿机构的运动。具体分析补偿电机的输出转数，以及为达到补偿效果，生产率与补偿电机输出转速之间的关系，从而为电器的设计提供有效的依据。     

基于UG技术的制袋-充填-封口机的计算机辅助分析系统的设计

介绍了基于UG技术的制袋-充填-封口机的计算机辅助分析系统,描述了它的结构、实现原理和特点。该系统在Windows9x/NT平台上工作,运用UG软件进行方案的设计及空间结构运动于机械结构的分析与仿真,可实现综合运用CAD/CAE进行完整方案设计与优化过程,获得高质量、高效率的方案。是设计人员进行包装机性能模拟、方案决策的得力工具。     

基于缓冲包装的系统分析

从系统工程的角度出发，通过描述缓冲包装系统分析的步骤，对缓冲包装系统的流通环境，系统结构，开发成本和系统目标的有关分析内容进行了探讨。     

啤酒瓶装箱机构的运动分析

啤酒瓶吊入式装箱机的装箱机构是由曲柄连杆机构和双摇杆机构组合而成的 ,为确保其工作可靠和运动平稳 ,采用解析法对此进行了运动分析 ,这对装箱机的设计是非常必要的。     

大尺寸外径千分尺测量面改进性修理

由于烟气分析仪组分的增加和测量原理的改变,对烟气分析仪的检定工作提出更高要求,对检定工作中发现的问题进行探讨,并提出实际操作和检定依据等方面的建议。     

Elasto-plastic Analysis of Two-dimensional Orthotropic Bodies with the Boundary Element Method

The Boundary Element Method (BEM) is introduced to analyze the elasto-plastic problems of 2-D orthotropic bodies. With the help of known boundary integral equations and fundamental solutions, a numerical scheme for elasto-plastic analysis of 2-D orthotropic problems with the BEM is developed. The Hill orthotropic yield criterion is adopted in the plastic analysis. The initial stress method and tangent predictor-radial return algorithm are used to determine the stress state in solving the nonlinear equation with the incremental iteration method. Finally, numerical examples show that the BEM is effective and reliable in analyzing elasto-plastic problems of orthotropic bodies.     

气膜磁头的非线性运动轨迹计算和测试分析

本文对计算机外部设备中广泛使用的双轨气膜磁头轴承的稳定性进行了研究.考虑到现代磁头-磁盘气膜间隙已进入亚微米级,甚至达0.1μm,因此利用磁盘盘面上故意做成的凸台对磁头进行激励,计算了气膜磁头的非线性运动轨迹,并用激光多普勒振荡仪进行了测试.理论计算和试验数据吻合,证明计算方法和理论分析是正确可靠的.通过对三种磁头稳定性的比较,发现其中表面开槽的磁头稳定性最好,这对实际磁头的参数和结构设计具有实用价值.     

The Fatality Analysis Reporting System as a tool for investigating racial and ethnic determinants of motor vehicle crash fatalities

The Fatality Analysis Reporting System (FARS) is a Department of Transportation database in the public domain that contains detailed information about fatalities resulting from motor vehicle crashes on public roadways in the United States since 1975. However, data on race and Hispanic ethnicity were not collected by FARS until 1999. Since then, completeness of reported racial and ethnic information has varied from State to State. To assess utility of FARS for investigating race- and ethnicity-specific risk factors associated with motor vehicle crash mortality, we examined yearly national and State-specific reporting rates of race and Hispanic ethnicity for 168,863 motor vehicle crash fatalities from 1999 to 2002. In 1999, national reporting was 85% for race and 78% for Hispanic ethnicity. Over the 4-year study period, a significant linear increase in annual reporting for both race and Hispanic ethnicity was evident at the national level, as reporting by individual States improved over time. In 2002, national reporting rates reached 90% for race and 88% for Hispanic ethnicity. Our findings indicate that FARS has become a valuable resource for population-based studies of motor vehicle crash mortality disparities that exist among racial and ethnic subpopulations in the United States.     

车辆系统振动的理论模态分析

将车体和转向架看成弹性体,采用有限元方法,建立用空间梁单元描述的具有50个自由度的车辆系统力学模型,并以客车为例研究其垂向振动的固有特性,所得结果既反映系统动力学性能,又为动态响应计算和分析找下基础。     

冰蓄冷空调应用分析

分析冰蓄冷空调的应用条件及通过对投资及年运行费用的比较进行说明.     

工作姿势分析法在汽车零部件工位器具改善中的应用

目的为减少因工位器具设计不当对作业人员带来的工伤。方法本文从人因工程的视角出发,以滤清器总成器具为例,运用工作姿势分析系统(OWAS,Ovako Working posture Analysis System)对汽车厂工位器具进行改善研究。结果研究表明应用工作姿势分析系统(OWAS)改善后的工位器具可以在满足零部件配送要求的前提下,最大程度减少作业人员在这一作业过程中的不合理姿势,能够有效保护作业人员。结论工作姿势分析系统(OWAS)用于工位器具的改善具有良好的效果,且操作简单,具有很高的应用价值和推广意义。     

产品设计分析的理论模型建构探索

通过分析建立产品设计分析理论模型的必要性,提出模型的基本构成要素为目标消费群、功能、外形(包括形态、色彩和材质)、人机、生产工艺、经济性六方面因素,并阐述各要素的基本内容以及相互关系,以期为产品设计分析的研究起到抛砖引玉的作用.