Abstract
Variable mass structures exhibit non-stationary characteristics and the corresponding time-varying (TV) dynamics are difficult to represent by explicit dynamic equations or finite element models via mechanism analysis. Operational modal analysis of variable mass structures based on vector response measurements is considered in this paper. In order to solve the practical problem of operational modal analysis for variable mass structures, univariate stochastic parameter evolution (SPE) methods are extended to the multivariate case and validated by a numerical varying mass system. Thereafter, a laboratory liquid-filled cylindrical structure with decreasing filling mass is built and analyzed by using the conventional “frozen-configuration” technique and non-parametric time-frequency analysis method. Finally, the multivariate SPE method is applied to identify the liquid-filled cylindrical structure with decreasing filling mass, and identification results demonstrate that the proposed method is able to obtain the TV dynamic characteristics of variable mass structures under operating conditions by only using the available vector response measurements.
Published Version
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