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试验模态分析最佳测试点选取方法的优化

DOI: 10.13700/j.bh.1001-5965.2013.0292, PP. 536-543

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Abstract:

作为有限元模型修正的重要依据,试验模态分析的结果受多方面因素的影响,其中很重要的一方面就是测试点的选取.基于目前试验模态分析中最常用的两种测试点选择方法——有效独立法(EI,EffectiveIndependent)和模态动能法(MKE,ModalKineticEnergy),提出了一种新的测试点优化选择方法——有效独立-模态动能变异系数法(EI-CVMKE,EffectiveIndependent-CoefficientVarianceofModalKineticEnergy).并提出了一种新的评估测试点选择方法优劣的准则——模态动能变异系数准则(CVMKE).运用模态置信准则(MAC,ModalAssuranceCriterion)、CVMKE和奇异值分解比(SVDration,SingularValueDecompositionratio)评价并比较了EI,MKE和EI-CVMKE的测试点优化结果.以印刷电路板作为算例,并通过实物模态试验验证,结果表明EI-CVMKE选取的测试点在考虑了截断模态线性独立的同时又具有较高的模态动能,有较强的抗噪声性能,在3种方法中最佳.

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