气缸盖有限元计算网格布置形式讨论

通过对一些标准件进行有限元精度分析,结合理论计算值和实验数据确定了一些简单典型结构在达到计破算精度要求时网格划分所需要的合适密度,探索了网格密度与结构尽寸精度的情况下大大缩减了计算规模和时间.     

高效柴油机整机结构动态特征有限元分析

在完成了基于实验对比的离散误差收敛性分析的基础上建立了某军用V型柴油机主要零部件及整机的有限元分析模型，采用Lanczos法对零部件及整机组合体多方案的自由模态进行了计算。并由计算结果对修改方案的动态特性进行了初步评价。所得结论已成功用于该型柴油机的改进设计中。     

高效柴油机整机结构动态特性有限元分析

在完成了基于实验对比的离散误差收敛性分析的基础上建立了某军用V型柴油机主要零部件及整机的有限元分析模型 ,采用Lanczos法对零部件及整机组合体多方案的自由模态进行了计算 ,并由计算结果对修改方案的动态特性进行了初步评价。所得结论已成功用于该型柴油机的改进设计中     

结构优化程序的研究与实现

本文介绍一个针对 PC 机研制的通用结构优化程序系统,它包括有限元及图形前后置等模块。文中对程序的算法及实现进行了论述。     

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。     

Experimental study on compression stroke characteristics of free-piston engine generator

The compression stroke characteristics of free-piston engine generator were studied. The numerical model of the compression stroke was established based on thermodynamics and dynamics equation, and the leak loss, heat loss and friction loss were considered. Through solving numerical equations, the in-cylinder pressure of compression stroke under different compression ratios was calculated, energy transfer and conversion process was analyzed, and the calculated results were experimentally verified. The results showed that the actual effective output of electronic energy and the compression energy stored in the compressed gas accounted for about 70%. The compression energy gradually increased with the increasing compression ratio. When the compression ratio was more than 7.5, the actual compression energy increased slowly and the energy error between simulation and test decreased.     

空气净化器壳体注塑模的CAD/CAE

一、引言车用空气净化器壳体为典型的薄壁复杂零件,其注塑过程受多方面条件影响,对注塑模进行必要的仿真分析对模具结构设计和主要工艺参数的选取都有着重要的指导意义。本文通过对某车用空气净化器壳体（以下简称净化器壳体）模具注塑情况进行的注塑过程流动仿真分析,优化得出了合理的浇注系统,设计改进了模具的具体结构,并建立了符合企业标准的模具零件库,为今后进行类似模具的设计制造提供了条件。——1计算模型的建立图1为净化器壳体的三维实体模型。由实体模型建立注塑件及模具的有限元分析模型如图2所示。根据分析目的和计算精…     

Numerical Simulation of a Spark Ignited Two-Stroke Free-Piston Engine Generator

A numerical program is built to simulate the performance of a spark ignited two-stroke free-piston engine coupled with a linear generator. The computational model combines a series of dynamic and thermodynamic equations that are solved simultaneously to predict the performances of the engines. The dynamic analysis performed consists of an evaluation of the frictional force and load force introduced by the generator. The thermodynamic analysis used a single zone model to describe the engine’s working cycle which includes intake, scavenging, compression, combustion and expansion, and to evaluate the effect of heat transfer based on the first law of thermodynamics and the ideal gas state equation. Because there is no crankshaft, a time based Wiebe equation was used to express the fraction of fuel burned in the combustion. The calculated results were validated by using the experimental data from another research group. The results indicate that the free-piston generator has some advantages over conventional engines.     

Prediction of a V-8 diesel engine’s structural radiated noise and research of important parameters’ effects on the engine’s acoustic behaviors

Based on the coupled boundary element method-finite element method(BEM-FEM)method and the acoustic transfer vector(ATV)technology,BEM/FEM model is proposed for a V-type eight cylinders engine acoustic radiation simulating analysis under semi-anechoic condition.Acoustic radiation power,field points sound pressure level and panel contributions are calculated by acoustic radiation response analysis.Additionally,based on the engine acoustic performance,different acoustic behaviors of engine are studied by changing engine materials,oil pan structures as well as geometry parameters.The acoustic performance of this engine is predicted and the influence of material,structural and geometry parameters on engine radiated noise are generalized.The principle will guide the design and optimization of the engine prototype in further work.     

基于软件集成的结构优化设计方法研究

本文提出了一种实用的利用成熟有限元分析平台和多学科设计优化软件进行结构优化设计的方法.以某型号4缸发动机曲轴为例,采用I-DEAS、VC++、iSIGHT软件构建了一个曲轴结构尺寸优化软件集成系统,实现了曲轴结构优化的整个流程,并就程序控制的实体模型参数化修改、集成框架以及连续二次规划法(NLPQL)等进行了探讨.