基于频响函数矩阵法的薄板结构阻尼系数识别 Recognition of Structural Damping Coefficient of Thin Plate Based on the Frequency Response Matrix Method

机械系统的粘性或结构阻尼系数可以从空间上描述系统的阻尼分布，这对于阻尼结构减振设计具有重要的意义。本文研究基于频响函数矩阵法来辨识悬臂薄板结构系统阻尼系数。详细叙述了频响函数矩阵法的原理和测试流程。在此基础上组建了辨识结构系统阻尼系数的测试系统，对薄板结构进行了测试分析。从识别的阻尼矩阵可以看出，无论是粘性阻尼还是结构阻尼，薄板根部的数值均大于自由端的数值。比较不同频带的阻尼系数，可以看出在低频段粘性阻尼系数较大，而在高频段结构阻尼系数较大。 The distribution of system damp could be described by the internal friction and structure damped coefficient. It was important for design of reducing vibration of the damping structure. The damping coefficient of cantilever thin plate was identified by the frequency response function matrix method in this paper. The principle and test process were introduced. The test system was built to identify the damping coefficient. The thin plate was analyzed by the system. The data of the plate root were all bigger than that of freedom end no matter the damping matrix was inherent friction or the structural damping coefficient. The inner friction coefficient of low frequency band was bigger, while the structural damping coefficient of high frequency band was bigger.