Adaptation of the Concept of Modal Analysis to Time-Varying Structures
Authors: Liu, K.; Kujath, M.R.
Source: Mechanical Systems and Signal Processing, Volume 13, Number 3, May 1999 , pp. 413-422(10)
Publisher: Academic Press
Abstract:The elegance and global character of modal analysis make it very attractive for adaptation to time-varying systems. Most of the concepts of modal analysis are well established in literature and widely understood for linear time-invariant systems. This paper discusses an adaptation of modal analysis concepts to time-varying systems. A typical contemporary example of a time-varying system is a flexible space manipulator or a reconfiguring space structure. An approximation of a time-varying transfer function is introduced by making assumptions about its variability. This approximate transfer function is referred to as a pseudo-transfer function. The modal parameters associated with the pseudo-transfer function are referred to as the pseudo-modal parameters. This paper discusses the validity and the extent of applicability of pseudo-modal parameters.
Document Type: Research Article
Affiliations: Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, B3J 2X4, Canada
Publication date: 1999-05-01