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Indexed by:会议论文

Date of Publication:2011-01-01

Included Journals:CPCI-S

Page Number:1410-1415

Key Words:frequency domain analysis; pseudo-excitation method; wave spectrum; rational functions

Abstract:A cylinder is modeled as a Bernoulli-Euler beam subjected to a time-variant axial loading at top end and both ends are assumed as hinged. The axial tension consists of a constant static part and a harmonic dynamic part. The wave force is formed using a semi-empirical Morrison equation. Waves are assumed to be random and their heights comply with the JONSWANP spectrum. A frequency domain method is developed for such linear systems with periodical time-varying parameters based on the pseudo-excitation method. The standard deviations of structural displacement responses are calculated, and the influence of time-variant tension frequency, i.e. the parametric excitation frequency, on such responses is discussed.