Operational modal analysis for linear time-varying continuous dynamic structure based on LMPCA

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Guan, Wei | Wang, Cheng^* | Wang, Tian | Zhang, Huizhen | Luo, Xiangyu | Xiang, Liang | Liu, Yan | Xie, Xiaodong

Affiliations: College of Computer Science and Technology, HuaQiao University, Xiamen, Fujian, China

Correspondence: [*] Corresponding author: Cheng Wang, College of Computer Science and Technology, HuaQiao University, No.668 Jimei Road, Xiamen 361021, Fujian, China. E-mail:[email protected]

Abstract: Based on the theory of ``time-frozen'', this paper proposes a novel operational modal analysis (OMA) for linear time-varying structure using limited memory principal component analysis (LMPCA). Compared with modal coordinate decomposition of non-stationary response signals for linear time-varying continuous beam structure, it is found that PCA can be decomposed to extract time-varying instantaneous modal parameters, which reveal structure characteristics in limited memory window length L. Numerical simulations results on a cantilever beam with slow time-varying mass are presented to verify the TV instantaneous natural frequencies and modal shapes identification capability of the LMPCA.

Keywords: Operation modal analysis, slow time-varying structure, time-frozen, instantaneous modal parameters, limited memory principal component analysis

DOI: 10.3233/JAE-162085

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 701-709, 2016