机载光电平台内框架拓扑优化设计  

Topology Optimization Design for Inner Frame of Airborne Electro-optical Platform

作　　者：王平[1,2] 张国玉[1] 刘家燕[2] 李明[2] 高玉军[2] 

机构地区：[1]长春理工大学光电工程学院,长春130022 [2]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《机械工程学报》2014年第13期135-141,共7页Journal of Mechanical Engineering

基　　金：国家高技术研究发展计划(863计划;2008AA121803);国家重点基础研究发展计划(973计划;2009CB72400607)资助项目

摘　　要：为提高机载光电平台动态性能,减小振动环境对其成像质量的不利影响,采用基于变密度法的拓扑优化理论,以最小化合成柔度指数为目标函数,以基频不低于某值为约束条件,对光电平台内框架进行了拓扑优化设计,并对优化前、后内框架结构的刚强度及模态振型进行了对比分析,结果表明优化后内框架在减重8%的情况下静、动态特性均得到了大幅度提升,最大变形量由0.058 mm下降至0.016 mm,最大应力值由16.3 MPa下降至2.7 MPa,基频由131 Hz提高至213 Hz。在减小重量的同时有效地降低了结构的最大变形,提高了结构整机性能。最后通过振动试验验证了拓扑优化结果的正确性。这种拓扑优化技术将为以后光电平台的设计提供有效的帮助。In order to improve the dynamic performance of airborne electro-optical platform and diminish the negative effect of vibration environment on image quality,a topology optimization based on the variable density theory is studied.In the topology optimization of airborne electro-optical platform,the minimum combined compliance index is taken as an objective function and the fundamental frequency not less than a specified value as the constraint.And the stiffness,strength and modal performance of the inner frame structure before and after optimization are compared and analyzed.The results show that the static and dynamic characteristics are improved tremendously after optimization under the condition of the inner frame weight loss 8％,the maximum deformation dropped from 0.058 mm to 0.016 mm,the maximal stress reduces from 16.3 MPa to 2.7 MPa,and the fundamental frequency increases from 131 Hz to 213 Hz.In the case of reducing weight as well as reduce the maximum deformation of the structure effectively,the engine performance is improved.At last,the topology optimization result is verified by vibration test.This topology optimization technology will provide efficient help to the later design of electro-optical platform.

关 键 词：机械设计 拓扑优化 光电平台 变密度法 有限元分析 

分 类 号：V241[航空宇航科学与技术—飞行器设计]