部件试验模态综合的动柔度法

基于半试验半理论信息,提出一种简单有效的部件试验模态综合技术。试验上它只要求测量部件的低阶模态参数,而高阶模态的影响,由部件的一种动柔度来体现。这种动柔度几乎包含了高阶模态的全部静态贡献和全部动态贡献,因此精度很高。当然,有限元模型误差较大时,需要利用部件的测量模态参数对有限元模型进行必要的修正或重建。

Synthesis of component experimental modes using a dynamic flexibility method

A synthesis technique of component test modes based on experimental and theory information is developed in this paper. This method is simple and feasible. It only requires experimentally measurement of the lower-order modes of various components. Influence of each component higher-order modes is embodied by an analytical dynamic flexibility matrix without analytical higher-order modes. This dynamic flexibility matrix includes almost entire static-state and dynamic-state contribution of the higher-order modes. Thus the precision of the component test modal synthesis proposed in this paper is better, which is already demonstrated by the results of a numerical example.