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Date of Publication:2007-01-01

Journal:振动与冲击

Issue:4

Page Number:119-122,125

ISSN No.:1000-3835

Abstract:In dynamic testing of structures based on ambient excitation such as ground motion and ground micro-tremor, it is difficult to measure input information accurately, because input information is random and its acting location is uncertain. On the basis of the existed methods for multiple inversion, a new approach called 'weighted average amending method' is put forward, it can be used to identify parameters of a non-linear system when ground motion is unknown. If the non-linear system is the one with non-proportional damping, combining this new method with the relaxation method, a new iterative procedure to identify its parameters with unknown input based on least square is proposed. At last, the results of a numerical example with unknown ground motion show that the proposed method is effective.

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