Terfenol-D nonlinear vibration absorber

Jon R. Pratt; Shafic S. Oueini; Ali H. Nayfeh

doi:10.1117/12.275692

6 June 1997 Terfenol-D nonlinear vibration absorber

Jon R. Pratt, Shafic S. Oueini, Ali H. Nayfeh

Proceedings Volume 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems; (1997) https://doi.org/10.1117/12.275692
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

Jon R. Pratt, Shafic S. Oueini, and Ali H. Nayfeh "Terfenol-D nonlinear vibration absorber", Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); https://doi.org/10.1117/12.275692

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