论文部分内容阅读
本文提出了一种识别模态参数的频一时域方法。用适当的谱窗去截取全景频谱,得到仅含一个或少许几个模态的频响函数,并作IFFT,即将所截取的频响函数转换成自由振动响应,然后利用LSCE法识别相应的模态参数.重复上述过程,那么所有包含在测量的频响函数中的模态参数就可以识别出。实验结果表明,文中所提出的方法与原来的LSCE法相比,具有许多明显的优点。它能容易地识别出小能量模态并节省大量的计算时间,而且从LSCE法计算的结果中很容易区别出噪声模态。
This paper presents a frequency-domain method to identify modal parameters. The appropriate spectrum window is used to cut the panoramic spectrum to obtain the frequency response function containing only one or a few modalities. The frequency response function is transformed into a free-vibration response by using an IFFT, and then the corresponding mode is identified by using the LSCE method Repeat the above procedure so that all modal parameters contained in the measured FRF can be identified. The experimental results show that the proposed method has many obvious advantages compared with the original LSCE method. It can easily identify small energy modalities and save a lot of computational time, and the noise modalities can be easily distinguished from the results of the LSCE method.