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Proceedings Paper

Terfenol-D nonlinear vibration absorber
Author(s): Jon R. Pratt; Shafic S. Oueini; Ali H. Nayfeh
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Paper Abstract

An active non-linear vibration absorber for flexible structures is developed. The absorber exploits the inherent quadratic nonlinearity of the actuator material Terfenol-D to produce a two-to-one autoparametric resonance between the forced vibrations of a structure and a second-order analog controller circuit. Nonlinear resonance of this type exhibits the well-known saturation phenomenon. When the structure is forced near resonance, its response saturates to a small value. This type of control has been demonstrated by previous researchers using linear actuators where nonlinearities were introduced via the analog circuit. In contrast, we use the natural nonlinearity of the Terfenol-D material to achieve the same results. We develop the theory and present experimental results for the control of the first and second modes of a cantilever beam. We also consider the application of the strategy experimentally when the forcing is due to a rotating imbalance. In this case, the excitation source is nonideal. Our results indicate that the saturation based control technique implemented with a Terfenol-D actuator constitutes an effective nonlinear vibration absorber.

Paper Details

Date Published: 6 June 1997
PDF: 11 pages
Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); doi: 10.1117/12.275692
Show Author Affiliations
Jon R. Pratt, Virginia Polytechnic Institute and State Univ. (United States)
Shafic S. Oueini, Virginia Polytechnic Institute and State Univ. (United States)
Ali H. Nayfeh, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 3041:
Smart Structures and Materials 1997: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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