In order to obtain a more accurate boundary condition of structure in dynamic analysis and optimization design, the joint parameter identification is one of the key technologs. In combination with engineering practice, the method based on frequency response function (FRF) to identify the characteristic parameters of the joint was proposed.Whether the complete FRF can be obtained or not was studied and the corresponding solving strategy was presented. The method avoids the matrix inversion directly, and transforms contradictory equation to equation with definite solution by using least-square principle, which ensures the stability of numerical calculation. Considering the damping information is inferior to stiffness information in identification process, in order to identify the damping parameter more accurately, a successive identification method was further proposed. Example analysis confirms that the method is of high identification accuracy.%进行机械结构的动力分析与动态优化设计时,为获得比较准确的结构边界条件,结合部参数辨识成为其中一项关键技术.结合工程实际,应用频响函数辨识结合部刚度与阻尼参数的方法进行参数识别,对能否获取完备频响函数进行了研究,并作出相应的求解策略.该方法避开了对频响函数直接求逆,运用最小二乘原理将矛盾方程转化为定解方程,保证了数值计算的稳定.一般情况下,结合部处绝对阻尼值要远远小于绝对刚度值,为了更准确地辨识出阻尼值,需采用对阻尼进行二次辨识.该方法具有一定的工程实用价值,而且辨识过程简单.算例证实了该方法具有很高的辨识精度.
展开▼
