摘要
对于许多振动问题,当振动系统的二个固有频率值十分接近而且这个系统具有足够大的阻尼时,应用传统的实验鉴别法,如那些基于频率响应函数的方法,是很难加以识别的。本文提出了一个相当简单的方法,这个方法立足于从冲击试验的响应数据中去识别多自由度系统的机械导纳,对一个相当重迭的二自由度梁系统运用上面的方法并且将结果和那些用频响函数法所获的结果进行了比较,通过对这个实验方法的扩展,它可去用于识别非线性系统的元素。
For many vibration problems wheere two natural frequencies are close in value and with sufficient damping, it becomes difficult to identify by applying traditional experimental identification methods such as those based on frequency response functions. In this paper a relatively straighforward procedure based on identifying the mechanical impedance of multidegree of freedom systems from impact response data is proposed.The technique is applied to experimental data from a highly coupled two degree of freedom beam system and the results are compared with those obtained by using frequency response function techniques. Finally, it is shown how the procedures can be extented to identify non-linear system elements.
出处
《北京建筑工程学院学报》
1991年第2期27-37,共11页
Journal of Beijing Institute of Civil Engineering and Architecture
