大型构件动态固有频率和阻尼系数辨识方法

IDENTIFICATION METHOD OF DYNAMIC NATURAL FREQUENCIES AND DAMPING FOR LARGE-SCALE STRUCTURE

大型构件在实际工作环境中的系统动态固有频率和粘性阻尼系数辨识一直是一个“棘手”的问题。提出了基于非线性建模和小波变换方法的大型构件的固有频率和粘性阻尼的分析方法 ,成功地检测出我国某大型水轮机轴系的动态固有频率和粘性阻尼系数。通过仿真结果与理论值的比较 ,证实了该方法的有效性和精确性。

Identification of dynamic natural frequencies and viscosity damping coefficient for a large-scale structure in practical working condition is a very difficult problem. A new system identification method for the kind of engineering problems is presented, using nonlinear modeling and wavelet transform. The dynamic natural frequency and damping for the shaft system of a water turbine are successfully estimated from field measured signal using this method. Through comparing simulation results to theoretic results, the adaptability and validity of the method are here proved.