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- W2096305003 abstract "Exact representation of unbounded soil contains the single output–single input relationship between force and displacement in the physical or transformed space. This relationship is a global convolution integral in the time domain. Rational approximation to its frequency response function (frequency-domain convolution kernel) in the frequency domain, which is then realized into the time domain as a lumped-parameter model or recursive formula, is an effective method to obtain the temporally local representation of unbounded soil. Stability and identification for the rational approximation are studied in this paper. A necessary and sufficient stability condition is presented based on the stability theory of linear system. A parameter identification method is further developed by directly solving a nonlinear least-squares fitting problem using the hybrid genetic-simplex optimization algorithm, in which the proposed stability condition as constraint is enforced by the penalty function method. The stability is thus guaranteed a priori. The infrequent and undesirable resonance phenomenon in stable system is also discussed. The proposed stability condition and identification method are verified by several dynamic soil–structure-interaction examples. Copyright © 2009 John Wiley & Sons, Ltd." @default.
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- W2096305003 date "2009-01-01" @default.
- W2096305003 modified "2023-09-25" @default.
- W2096305003 title "Stability and identification for rational approximation of frequency response function of unbounded soil" @default.
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- W2096305003 doi "https://doi.org/10.1002/eqe.936" @default.
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