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根据速度导纳的特点,作者提出了拟合实测的速度频率响应数据来识别模态参数的方法。几个数字例子的结果表明:此方法 1)能获得离散或连续系统的模态参数; 2)不仅能应用于比例阻尼系统而且能应用于非比例阻尼系统。 3)能够应用于模态密集的情况,即使是两个相邻模态的模态阻尼十分接近且耦合因子为η=(f_2-f_1)/f_1～0.001的条件下,也能获得较满意的结果。在所研究的频率范围内,实测的和识别的速度导纳表示在同一复平面内(速度导纳图) 对于比例阻尼系统,本文还引用了无量纲因子,致使此方法的使用频率范围延伸到20KHZ以上。
According to the characteristics of velocity admittance, the authors propose a method to identify the modal parameters by fitting the measured velocity and frequency response data. The results of several numerical examples show that this method 1) can obtain modal parameters of discrete or continuous systems; and 2) can be applied not only to proportional damping systems but also to non-proportional damping systems. 3) can be applied to the case of modal density, even if the modal damping of two adjacent modalities is very close and the coupling factor is η = (f_2-f_1) /f_1~0.001, satisfactory results can be obtained result. In the frequency range studied, the measured and identified velocity admittance representations in the same complex plane (velocity admittance map) For the proportional damping system, we also refer to the dimensionless factor, so that the frequency range of this method is extended to 20KHZ above.