【摘要】 根据激振信号{ft}和响应信号{xt}建立二维时序模型ARMAV(n,m,2),利用时序模型参数与模态参数的对应关系对结构进行模态参数辨识,识别出所有的模态参数,并根据时序模型参数进行功率谱估计。通过对电子机柜横梁的激振实验,表明用该种方法对结构参数的识别结果与理论值很吻合,可以在工程实际中对整个电子机柜结构进行参数识别,并可以得出功率谱图。更多还原

【Abstract】 A 2-Dimensional time series model called ARMAV(n, m, 2) was established by both impulse excitation shaking signals and response signals of the structure . And the corresponding relation between model parameters of time series and the modal parameters is used to identify all the modal parameters of the vibration system.Thus basing on model parameters of time series the power spectrum of the structure is estimated. The identification results of field test of a cabinet conform well to the theoretical values. So the method can identify the parameters of a complex structure in engineering practice and get the power spectrum.更多还原