湖南大学学报（自然科学版）2016，Vol.43Issue(8)：52-56,5.
质量时变系统的动载荷识别
Identification of Dynamic Loads in Mass-variable System
摘要
Abstract
The technique of the load identification of mass variable system was studied.The generalized modal concept applied on time-varying system was introduced,and the method of modal superposition was used to give dynamic equations with partially decoupled in initial modal space defined at initial instant. Based on both virtual distortion method (VDM)accounting for the effect of mass change and the Duhamel integration in initial modal space,two approaches to identify modal forces were constructed:one is the re-cursive calculation pattern formulated on the basis of modal acceleration,and the other is the regularized solution by the direct discretization of Duhamel integration with modal displacement and acceleration.A mass variable system with 1 6 degrees of freedom subj ected to two external loads was analyzed.The re-sponses were calculated by applying Euler midpoint symplectic difference method and added with random noise to simulate measured signals.Two dynamic loads were identified by two inversion approaches of mo-dal forces.The comparison of results has indicated that regularized solution format has a higher numerical robust than the recursive calculation pattern,but the latter is sensitive to the noise of measurement.关键词
变质量/动态载荷/反问题/递归计算/正则化Key words
time-varying mass/dynamic loads/inverse problems/recursive calculation/regularization分类
数理科学引用本文复制引用
彭凡,王樑,肖健..质量时变系统的动载荷识别[J].湖南大学学报（自然科学版）,2016,43(8):52-56,5.基金项目
湖南省自然科学基金资助项目 （）
