基于OptiStruct的排气系统隔热罩形貌优化设计

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摘 要：以某车型排气系统隔热罩设计为例，使用OptiStruct软件建立仿真模型，对隔热罩的一阶固有频率进行分析，对分析后的结果通过增加加强筋的方法进行优化，同时考虑工艺性和制造成本，优化加强筋的分布，最后对优化的数据重新进行校核，对比优化前的模型，结果表明：一阶固有频率大幅度提升，满足设计要求。

关键词：排气系统 隔热罩 一阶固有频率 形貌优化 模态分析

Shape Optimization Design of Exhaust System Heat Shield Based on OptiStruct

Zhao Lingjie Tan Zhengsheng Sui Chaoya Feng Shifu

Abstract：Taking the design of a vehicle exhaust system heat shield as an example， the simulation model was established by using Optistruct software to analyze the first-order natural frequency of the heat shield. The analysis results were optimized by adding stiffeners. At the same time， considering the manufacturability and manufacturing cost， the distribution of stiffeners is optimized. Finally， the optimized data is checked. Compared with the model before， the results show that the first-order natural frequency was greatly improved to meet the design requirements.

Key words：exhaust system， heat shield， first order natural frequency， morphology optimization， modal analysis

1 引言

排气系统的作用是从发动机处导出废气，使废气对环境的影响达到可接受的水平，同时保证高温废气不影响整车的安全[1]。（剩余3782字）

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