多体系统的集中动载荷识别技术研究

Study on Identification of Concentrated Dynamic Load for Multibody System

采用考虑刚柔耦合的混合坐标系法和传统的运动弹性动力学(KED)方法,对由悬臂梁和旋转梁组成的简单多体系统进行正问题建模,求旋转梁在集中动载荷作用下的正响应。基于这两种不同的建模方法,在时域内,采用一维切比雪夫正交多项式拟合,推导出多体系统的动态标定矩阵,对作用于旋转梁上的载荷进行识别。通过一仿真算例,对基于不同正问题建模方法的识别结果进行对比,分析出刚柔耦合对识别结果的影响,以及正交多项式拟合法,对此非线性系统进行动态识别的局限性。并且,对于变速工况,给出了滤除驱动力矩影响的方法,识别结果得到改善。

In the paper, we describe the multibody system consist of cantilever beam and rotating beam base on two different methods. One is hybird coordinate method which takes the rigid-flexible coupled into account. The other is traditional Kineto-Elasto-Dynamic （KED） method. The dynamic calibration matrix is derive in time domain by in- troducing chebyshev polynominal to identify the concentrated dynamic load exerted on the rotating beam. The iden- tification results are compare base on different modeling methods through a simulation example. We can analyse the limitation of this identificaion way for nonlinear system and the effect of rigid-flexible coupling on the load identifi- cation caused by nonlinear factors. And we propose a new method to remove the response caused by driving moment to improve the identification accuracy.