The parameters updating of simulations models with ill-posed characteristics

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (12) : 121-126.

Feili Qiu, Limin Zhang, Weihua Zhang

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Abstract

With the numerical analysis and modeling wildly application and correct simulating model urgent requirement ,the parameter-sensitivity updating method has been developed rapidly. The direct least square method always can’t get the real parameter solution as the ill-posed system targets equations and the ill-conditioned sensitivity matrixes. The ill characteristics of the sensitivity matrixes and targets equations were researched. Then a six-dof discrete vehicle and the frame finite element model were updated with the Tikhonov regulation method, as the over determination and under determination simulation model separately. The problem of the direct least square method was solved. The updated models show mass of the real structure and the error between the components exactly, it’s proved that the method can be applied in engineering practice.

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model updating / parameter-sensitivity / ill-posed system / regulation method

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Feili Qiu, Limin Zhang, Weihua Zhang. The parameters updating of simulations models with ill-posed characteristics[J]. Journal of Vibration and Shock, 2015, 34(12): 121-126

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