The modal matrix expansion of the cross power spectra of the multi-measurement acceleration response in the multi-DOF structure is derived in detail.
详细推导了多自由度结构多测点加速度响应的互功率谱模态矩阵展开式。
This paper gives a theoretical formulation for the extraction of mode shape by fitting the cross power spectra of the outputs and a cantilever beam is analysed.
该文提出了一种用互功率谱求振型的方法，并对此理论进行了详细推导，以一悬臂梁为例对该方法进行了试验验证。
Analyzing the sequence of the parameters by the power and cross spectra yields main periodic changes of quasi-two-week oscillation.
对三参数序列应用功率谱和交叉谱分析得出，其主要周期变化为准两周振荡。
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