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The frequency response function (FRF)-based substructuring technique has been previously proposed for computing the vibratory response of complex built-up structures with moderately high-modal density characteristic. This is because it has the advantage of being able to incorporate experimental component FRFs directly into its spectral formulation. However, the accuracy of this technique is frequently hindered by spectral distortion problem due to ampli"cation of errors in the FRF-matrix during an inversion calculation. To analyze the in#uence of error ampli"cation, its inherent FRF-matrix inverse problem is mathematically transformed into an over-determined set of linear algebraic equations. The least-squares (LS) and total least-squares (TLS) solution schemes are proposed to handle this new formulation. It is then shown that these two proposed algorithms can lead to some improvements in the predictions but cannot eliminate the in#uence of error completely. To further achieve more accurate dynamic coupling response, the truncated singular value decomposition (TSVD) scheme is proposed to work in conjunction with the LS and TLS algorithms. Its e!ectiveness in reducing the in#uence o

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Author

T.C. LIM; J. LI

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-460X)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)