最小响应偏离度的振动夹具优化设计  

Optimization design of vibration fixture with the minimum response deviation

作　　者：李奇志[1] 陈国平[2] 陈文华[1] 刘继承[3] 朱昊峰 樊鑫 

机构地区：[1]浙江理工大学浙江省机电产品可靠性技术研究重点实验室,浙江杭州310018 [2]南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京210016 [3]南京电子技术研究所,江苏南京210039 [4]南京恩瑞特实业有限公司,江苏南京210013

出　　处：《振动工程学报》2014年第4期473-480,共8页Journal of Vibration Engineering

基　　金：浙江省重点科技创新团队计划资助项目(2010R50005)

摘　　要：为了解决夹具传递给试件的振动量级的输入严重不均匀和偏离参考谱加速度均方根值的现象,依据电动振动台多点控制原理和夹具频响函数特性,建立夹具优化计算模型。以某试件夹具设计为实例,依据Nastran软件计算夹具频响函数值,根据所建优化计算模型,求出夹具最优设计参数。优化结果表明,优化后夹具传力点处的响应均方偏离度及加速度均方根值的变动范围均小于传统方法设计的夹具所求值;同时,优化后的夹具振动试验测试结果表明,传力点处实测加速度均方根值的变动范围与夹具设计阶段优化后的计算值变动范围基本一致,这就证明该优化方法是可行的和实用的,可以为振动试验实施和夹具设计提供实践和理论指导。In order to solve the phenomenon to the Specimen and reduce the deviation of of the severely uneven vibration magnitude which is transferred by the test fixture the acceleration rms value, according to the electric vibration table multi--point control principle and the characteristics of a fixture frequency response, a fixture design optimization model was established. Taking a specimen fixture design as an example, the fixture FRF value was calculated by Nastran software, then the optimal design parameters of fixture was obtained according to the optimization model previously mentioned. Optimization results indicated that the mean square deviation of response acceleration and the acceleration rms variation range obtained the optimization method are all significantly smaller then that with the traditional method, while the vibration test results show that the variation range of the acceleration rms measured on the transfer point in the vibration test is basically the same with the result coming form the optimization calculation. It was proved that the proposed optimization method is feasible and practical, and it can provide a practical and theoretical guidance for fixture design in environmental vibration test.

关 键 词：振动试验 夹具 优化设计 数学模型 频响特性 

分 类 号：TB534.3[理学—物理]