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基于Hilbert谱变换函数的运行模态分析方法

DOI: 10.13197/j.eeev.2014.06.97.xiazp.013, PP. 97-102

Keywords: 运行模态分析,参数识别,Hilbert变换,半功率谱

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Abstract:

运行状态模态分析可在自然激励条件下识别结构真实的动力学特性.基于半功率谱估计进行模态参数识别是其中一类重要方法,但实际应用在效率、稳定性等方面存在不足.本文利用因果信号的Hilbert变换理论,推导了H谱变换函数的估计方法,并结合多参考点最小二乘复频域法实现运行状态模态参数识别.采用含有近频模态的7自由度仿真算例和悬臂梁实测算例对该算法进行了可靠性验证,并与传统的半功率谱函数法进行了比较.结果表明,H谱变换函数具有计算速度快、极点更稳定等优点,更适用于实际工程应用.

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