基于动特性分析的精密仪表转子—框架结构优化设计

Design Optimization of Rotor-frame Structure of Precise Instruments Based on Modal Analysis

为提高精密仪表的动态稳定性 ,提出一种基于结构动特性分析的综合优化设计方法。该法将有限元计算和模态试验相结合 ,利用有限元法分析最初的设计结构动态特性 ,然后对该结构进行试验模态分析 ,从而检验有限元分析方法的可信度。利用经过验证的简化模型和计算方法 ,分析结构参数改变时对系统动特性的影响 ,进而实现结构的优化设计。从转子—框架结构的优化过程可以看出 ,该方法在保证可靠性的同时大大降低了成本 ,并且提高了效率 。

In order to improve the dynamic stability of precise instruments, a compositive design method is proposed in this paper based on modal analysis of the structure. It combines Finite Element Analysis(FEA) with modal test. First we analyze modal characteristics of the structure with FEA, then test the natural frequency of the structure by experiments to check the reliability of FEA method. Finally we optimize the design by modifying certain parameters of the structure and analyzing the corresponding dynamic characteristics. Proved reasonable by the optimization instance of rotor-frame structure, this method can be widely applied in engineering design for its high reliability, efficiency and low cost.