瞬态随机激励下的非平稳响应分析及参数识别

The Unstable Responsive Analysis of Burst Random Excitation and Parameter Identication

分析了具有瞬态激励方式下结构的非平稳随机响应，并给出了在功率谱分析中防止谱泄漏的依据，提出了满足独立样本条件的判据。最后通过计算机仿真的结果说明了应用本文的瞬态随机激励方式获得的模态参数识别结果与使用通常的纯随机宽带激励方式所得到的模态参数识别结果相比较，前者的效果更佳，更接近于准确值。

This paper analyses the unstable vendom resposes in the case of burst radom excitation, gives out the bases for preventing spectrum leakage in the analysis of power spectrum andadvances the Judgement bases for meeting the needs of independent sample conditios. The resultsfrom the final computer simulation indicate that the stable parameter indentified results obtainedusing the burst random excitation method in this papoer are the most effective and much nearerto the accurate values in comparison with thoes obtained using pure random excitation method.