Closed-loop finite element modeling of active/passive damping in structural vibration control

Young-Hun Lim; Vasundara V. Varadan; Vijay K. Varadan

doi:10.1117/12.276530

13 June 1997 Closed-loop finite element modeling of active/passive damping in structural vibration control

Young-Hun Lim, Vasundara V. Varadan, Vijay K. Varadan

Proceedings Volume 3039, Smart Structures and Materials 1997: Mathematics and Control in Smart Structures; (1997) https://doi.org/10.1117/12.276530
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

A 3D finite element closed loop model is presented for modeling smart structures to predict the effects of both active and active/passive damping on vibrating structures. A comprehensive finite element formulation is presented that includes a control algorithm to relate the sensor voltage to the actuator voltage in a closed lop. Two control approaches based on charge or voltage as the active control force applied to the actuator are studied in the time and frequency domains. Constant velocity and constant displacement feedback control algorithms are subsequently implemented to investigate vibration controllability of structures. A model superposition in conjunction with direct integration is used in the time domain to overcome the numerical difficulties associated with an unsymmetric active damping matrix. A parametric study considers different types of controller as well as feedback gain. Comparisons are made between active constrained layer damping (ACLD) and purely active damping in the frequency domain. Some design studies are presented which examine the performance of ACLD modeling as a function of gain and viscoelastic materials thickness.

Citation Download Citation

Young-Hun Lim, Vasundara V. Varadan, and Vijay K. Varadan "Closed-loop finite element modeling of active/passive damping in structural vibration control", Proc. SPIE 3039, Smart Structures and Materials 1997: Mathematics and Control in Smart Structures, (13 June 1997); https://doi.org/10.1117/12.276530

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