摘要：在已有车型基础上研究了利用拼焊板进行前纵梁改进的轻量化设计方法,达到了在满足强度和刚度条件基础上减轻汽车重量和改善碰撞性能的目的。通过CAE解析了汽车在自重工况下的前纵梁应力分布,确定了前纵梁的分块数目及焊缝布置,推导了由拼焊板替换的车身梁结构的强度、弯曲刚度和扭转刚度的约束方程,并以此计算拼焊板前纵梁的厚度。整车碰撞仿真证明,拼焊板设计后的前纵梁具有更好的耐撞性,并且达到了减重17.7%的效果。

摘要：为了同时提高Al-Zn-Mg-Cu合金强度和成形性能,构建析出相和溶质元素浓度分布理论模型,并对合金内异构组织进行理论设计和过程调控。研究结果表明,沉淀相的溶解主要受其尺寸和热处理温度影响,溶质元素在合金基体中扩散所形成的异构组织特征主要取决于晶粒尺寸,而热处理温度仅对较大尺寸晶粒内的溶质元素浓度分布有显著影响。上述理论预测Al-Zn-Mg-Cu合金内的沉淀相和溶质元素分布情况与实测结果较为吻合。此外,通过有效控制Al-Zn-Mg-Cu合金内沉淀相和溶质元素浓度分布可以更好地精准构筑微区异构组织,从而更大幅度地改善合金的成形性能。

摘要：针对客车车身结构的特点,以车身的结构设计和有限元分析为核心,以三维参数化CAD软件Pro/Engi-neer为底层平台,建立车身结构设计系统。在此基础上,详细讨论了基于特征的成组技术、参数化设计、装配建模以及布局设计等建模技术在低地板城市客车设计过程中的应用。

摘要：本文采用1/4车模型对天棚阻尼器和主动悬架的动力学性能进行分析。针对执行器的非线性特性,探讨了微分几何法和反馈线性化法在主动悬架控制中的应用。在系统控制设计中采用了离散滑模法。仿真结果显示非线性控制律能有效地改善主动悬架的隔振特性。

摘要：In this paper the optimal model of the main energy absorbed structure in an auto-body “front rail”, based on structural crashworthiness is built. For an optimal design on structure crashworthiness, the new method is based on a response surface model and Pareto GA, which improves the efficiency and flexibility of an optimal design, that is brought forward. The traditional optimal method can not be applied in the design of an impact structure due to the high nonlinearity and large time cost of crashworthiness FE analysis. So the method of an optimal design based on crashworthiness is brought forward. After constructing the response surface model of auto-body crashworthiness, the Pareto GA can be applied to find the multi-objective globally. The optimal solution set can then be used to provide many scheme combinations for choice structural *** acquire the optimized structure parameters on front rail crashworthiness, this simplified model of an original design is built. After studying various ways of reinforcing the cross-section to control the structural failure mode, a better method has been found. On the precondition of not increasing the mass of the structure, an optimal design of the front rail is performed further. Finally, the optimized scheme is implemented in the full-car impact analysis and crashworthiness is studied. With proper measures to control deformation of the front rail structure the crashworthiness can be improved with minor structural modifications.

摘要：自古以来,人们都把水晶看作是灵性之物,很多时候被赋予许多美好的含义。黄、绿色的水晶主财运,紫水晶能化解烦恼,玫瑰红色的水晶则会带来爱情。家居中水晶的运用可华贵到璀璨生辉,亦可平静到安详柔美,何种风情全在主人点睛手笔的高下。高雅的水晶饰品逐渐成为很多人家中靓丽的一道景观,尤其是在这个春意盎然的五月里,一盏盏有着雪花般感受的水晶饰品,能让家的气氛显得更加浪漫与温馨!

摘要：在核空气净化系统设计中,常使用浸渍活性炭来吸附去除放射性碘。浸渍活性炭必须进行放射性碘吸附性能鉴定,以证明其对放射性碘的去除能力。而通过对浸渍活性炭的物理性能鉴定,可以获得浸渍活性炭在粒径、硬度和燃点等方面的参数以及对实际装料和使用的影响。