Study on Identification of Concentrated Dynamic Load for Multibody System
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摘要: 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。Abstract: 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 introducing chebyshev polynominal to identify the concentrated dynamic load exerted on the rotating beam.The identification 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 identification caused by nonlinear factors.And we propose a new method to remove the response caused by driving moment to improve the identification accuracy.
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Key words:
- multibody system /
- load identification /
- hybird coordinate method /
- KED
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