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MODAL IDENTIFICATION METHOD FOR NON-PROPORTIONALLY DAMPED STRUCTURES BASED ON EXTENDED SPARSE COMPONENT ANALYSIS
MODAL IDENTIFICATION METHOD FOR NON-PROPORTIONALLY DAMPED STRUCTURES BASED ON EXTENDED SPARSE COMPONENT ANALYSIS
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机译:基于扩展稀疏分量分析的非比例阻尼结构模态识别方法
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摘要
Data analysis for structural health monitoring relating to a method of modal identification for structures with non-proportional damping based on extended sparse component analysis. Hilbert transform constructs analytical signal of acceleration response. Analytical signal is transformed into time-frequency domain using short-time-Fourier transform. The criterion is taken as the correlation coefficient of adjacent frequency points is close to 1. Points contributed by only one mode are detected from the time-frequency plane. Phases calculated at single-source-points are used to remove local outliers through local outlier factor method. Amplitudes of complex-valued mode shapes are estimated by Hierarchical clustering of amplitudes for time-frequency coefficients at single-source-points. Averaged phases of grouped single-source-points are estimated phases of complex-valued mode shapes. Finally, complex-valued mode shapes are acquired. Modal responses are estimated by sparse reconstruction method. This method extends application range of sparse component analysis method, and can identify complex modes of non-proportionally damped structures.
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