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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:铁道学报

Affiliation of Author(s):化工学院

Issue:4

Page Number:93-99

ISSN No.:1001-8360

Abstract:The non-stationary random vibration analysis on train-bridge coupled systems is performed with the pseudo-excitation method (PEM), and the influence of train speeds on system random responses are mainly discussed. Each vehicle of the train is described by 27 degrees of freedom, and the bridge deck is modeled as a three-dimensional Euler beam. The lateral, rotational and vertical irregularities of the track are assumed to be multi-point different-phase stationary random excitations. By PEM for the time-variant system, these track irregularities are transformed into a series of deterministic pseudo harmonic excitations. The corresponding pseudo responses are solved by using the precise integration method (PIM) iteratively. Then the time-dependent PSD and standard deviation of interested quantities can be obtained easily. Finally, an estimation method of the maximum value for such system responses is suggested by taking the 3 times standard deviation of the Gaussian random variable as the error range. In the numerical example, the effectiveness and accuracy of the proposed method are justified numerically by the time history method, and the influence of the train speed on system random responses is mainly discussed.

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