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Proceedings Paper

Joint time-frequency domain identification of nonlinearly controlled structures
Author(s): Gang Jin; Michael K. Sain; Billie F. Spencer Jr.; Khanh D. Pham
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Paper Abstract

This paper introduces a 3-step approach for the identification of a linear structure that is controlled by nonlinear damping devices. First, the structure with the integrated nonlinear damper is subjected to random vibration test and the frequency response function (FRF) of the structure is calculated from the input-output data of the physical system. Based on the frequency domain data, a state space model is then estimated using a recently developed FRF curve-fitting technique that is designed especially for lightly damped structures with control inputs. Finally an iterative process is used to optimize the model performance in the time domain and an integrated model of the nonlinearly controlled structure is derived by interconnecting the structure model with that of the nonlinear damper. The complete approach is illustrated by the modeling of a base-isolated structure controlled by a magnetorheological (MR) fluid damper.

Paper Details

Date Published: 31 May 2006
PDF: 11 pages
Proc. SPIE 6221, Modeling, Simulation, and Verification of Space-based Systems III, 622106 (31 May 2006); doi: 10.1117/12.665180
Show Author Affiliations
Gang Jin, Ford Motor Co. (United States)
Michael K. Sain, Univ. of Notre Dame (United States)
Billie F. Spencer Jr., Univ. of Illinois at Urbana-Champaign (United States)
Khanh D. Pham, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 6221:
Modeling, Simulation, and Verification of Space-based Systems III
Pejmun Motaghedi, Editor(s)

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