预测机械产品结合面特性的优化识别方法

Optimum Identification Method to Predicate Interface Characteristic of Mechanical Structure System

提出了在结合面样件的实验模态和有限元分析模态间振型拟合的基础上，以两者对应的各阶固有频率之差的平方和最小为目标的优化算法，来识别结合面特性参数的方法，编制了相应的软件。将识别出的参数用于由一底座和二立柱构成的结构系统固有频率的预测。

In order to develope the technology of calculating static and dynamic behavior of new product during its design period without prototype, an identification method for calculatinng interface characteristic of mechanical structure system is presented. The paper discusses an optimum algorithm, choosing the contact stiffness coefficients as design variables, aimming at minimizing the sum of squares of eigenfrequency differences between finite element modes and their corresponding experimental modes based on mode shape indentification. Corresponding software has been developed. Using the identified parameters from an interface sample composed of one base and two columns, the eigenfrequency of mechanical structure system has been calculated and their accuracy has been verified by testing.