变结构变参数设计方法及其在机械CAD中的应用

提出了一种新颖的机械结构设计思想－变结构变参数设计方法，并结合实例，阐述了变结构变参数设计的概念、原则、实施措施和意义。由此对Ｉ－ｄｅａｓ软件包进行了二次开发，编制了发动机曲轴专用ＣＡＤ软件程序，并用某型号发动机曲轴进行了验证。     

液体火箭发动机氢、氧涡轮泵支撑结构分析

利用有限元法对某火箭发动机氢、氧涡轮泵的支撑结构进行了分析，获得了外载荷在氢、氧涡轮泵上、下支撑中力的分配比例关系；得到了推力室和氢、氧涡轮泵及其支撑结构的应力、变形分布；并通过调整推力室材料常数的方法，模拟了推力室的温度变化对氢、氧涡轮泵支撑结构的影响。     

对气缸盖基本拓扑结构及其气道的参数特性研究

利用参数研究方法,对大功率柴油机气缸盖的基本拓扑结构及其气道的参数特性进行了研究,获得了在纯机械负荷下,气缸盖的底板、顶板、中隔板、缸体丝对立墙、进排气道以及进排气侧壁的总体厚度变化对气缸盖整体应力水平的影响规律。     

不同海绵轮胎的力传递率曲线差异以及对车内噪声的影响

通过试验对比聚酯型聚氨酯海绵和聚醚型聚氨酯海绵的吸声系数,研究海绵轮胎和普通轮胎的力传递率曲线差异以及对车内噪声的影响。结果表明：聚酯型聚氨酯海绵的吸声系数大于聚醚型聚氨酯海绵;不同材质的海绵对轮胎力传递率曲线影响不明显,但降噪效果差异明显,聚酯型聚氨酯海绵比聚醚型聚氨酯海绵的降噪效果好;对于同种海绵,低速度下的降噪效果较好,随着速度的增大,降噪效果大致呈减弱趋势。     

Modal Test／Calculation Correlation Study on the Lower Crankcase of High-Duty Diesel Engine

To set up the dynamic FEM model of a high-duty diesel‘s lower crankcase with sufficient precision, modal correlation research on tested and calculated modes have been fulfilled. MACs between each mode pairs, CoMACs and ECoMACs on each node of modal testing model have been calculated. On the assistant of modal shape comparison, MACs could afford information about correlating relations between tested and calculated mode groups. CoMACs and ECoMACs have pointed out the direction of structure modification to FEM model. The resuits of the study show that the analytic model built has a certain degree of accuracy.     

自适应形状优化设计研究

目的提出一种基于结构边界强度的自适应形状优化设计的新方法,利用该方法对一大功率、高效柴油机的主轴承盖进行形状优化。方法以有限元模型中结构边界上的节点应力值来驱动节点位置的变化,利用物体热胀冷缩的数学模型,根据边界节点的应力值与给定的应力目标值,在边界节点上施加相应的温度载荷,使应力大于目标值的节点膨胀,反之收缩,最后达到边界上的节点应力均趋于给定的应力目标值,结果通过对一柴油机主轴承盖的优化,该主轴承盖的拱形外边界部分达到等强度,使之在满足强度要求的情况下质量减少到总量的５５％,结论该方法高效、可靠,适用于受机械载荷作用连续体的内、外边界的形状优化设计。     

气缸盖中一些关键功能结构的承载机理研究

借助有限元和力学等效原理等方法，对气缸盖中的一些关键功能结构的承载机理进行了深人研究。研究结果表明：气缸盖中的喷油器护套、进排气道、气门导管座孔、中隔板和加强筋通过不同的形式，传递并分散了作用在气缸盖上的燃气爆发压力；这些结构对抑止气缸盖的整体变形、降低气缸盖的总体应力集中水平具有重要的作用；调整这些结构的特性参数可以达到对气缸盖整体和局部应力水平的有效调整。     

Pareter Study of Some Key Structures for Cylinder Head

Using the method of the pareter study, some important dimensions of the cylinder head of an internal-combustion engine are analyzed. Under the mechanical load, the variational rules of the von Mises maximum stress on cylinder head are obtained, which are influenced by the thickness of the floor plate, head plate, jobbing sheet, standing partition board, and side plate of inlet port and exhaust port. A hypothesis is verified that there is an ideal matching point ong those above-mentioned main pareters. The quantificational proportion relations, between these key structural pareters and von Mises maximum stress of cylinder head, can provide a good help for the cylinder head's structural design.     

内燃机连杆有限元分析进展

对适用于不同分析目的的连杆组成和受力情况进行对比，从有限元强度应力分析、动响应分析、可靠性分析、优化分析等多个方面论述了内燃机连杆有限元分析近20年来的研究进展。指出目前研究中存在的一些不足和限于技术条件无法解决的问题，并讨论和展望了其未来的发展方向。     

Parameter Study of Some Key Structures for Cylinder Head

Using the method of the parameter study, some important dimensions of the cylinder head of an internal-combustion engine are analyzed. Under the mechanical load, the variational rules of the yon Mises maximum stress on cylinder head are obtained, which are influenced by the thickness of the floor plate, head plate, jobbing sheet, standing partition board, and side plate of inlet port and exhaust port. A hypothesis is verified that there is an ideal matching point among those above-mentioned main parameters. The quantificational proportion relations,between these key structural parameters and yon Mises maximum stress of cylinder head, can provide a good help for the cylinder head‘s structural design.