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Proceedings Paper

Semi-softening and hardening mechanical system for smart vibration generators
Author(s): J. W. Deng; Z. You
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Paper Abstract

Eight different nonlinear systems are considered in order to overcome the main drawback of existing vibration generator, the narrow bandwidth problem. Based on the static and dynamic analysis of these systems, the typical nonlinear softening and hardening Duffing oscillator systems have been selected for further consideration. The limitations of the selected systems are presented here. The softening system becomes unstable when the forcing amplitude exceeds the critical value, and the response amplitudes of the hardening system will be reduced by the extra stiffness introduced by the nonlinear term. Therefore, a mechanical system, which exhibits the dynamic characteristics of the softening system at the low force level while showing as the hardening with the increasing forcing, is proposed. With the assistance of the numerical method, it can be observed that the frequency response curves (FRCs) of the system will lean to left hand side of the linear resonance frequency when the forcing amplitude is comparatively low, and lean to the right when the input force can burst the energy barrier. More dynamic behaviors are discussed. According to the analysis, the proposed nonlinear system can be the solution to the narrow bandwidth problem.

Paper Details

Date Published: 15 April 2011
PDF: 14 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79813I (15 April 2011); doi: 10.1117/12.880405
Show Author Affiliations
J. W. Deng, Univ. of Oxford (United Kingdom)
Z. You, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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