A nonlinear vibration isolator based on a post-buckled inverted L-shaped beam

Tsuji, Yumiko, Sasaki, Takumi, Waters, Timothy P., Fujito, Koichi and Wang, Dong (2014) A nonlinear vibration isolator based on a post-buckled inverted L-shaped beam. 6th World Conference on Structural Control and Monitoring (WCSCM), Barcelona, Barcelona, Spain. 14 - 16 Jul 2014.

Abstract

In this paper, a nonlinear passive vibration isolator based on a post-buckled beam is proposed and its characteristics and effectiveness are investigated by FE analysis. The intended application of the isolator is specifically isolation in the vertical direction where the isolator is required to be sufficiently stiff statically to bear the weight of the isolated mass and to be soft dynamically to achieve a low natural frequency. One approach to reconcile such a conflicting requirement is to make use of a post-buckled element that maintains much of its static stiffness in its buckled state but whose dynamic stiffness dramatically reduces. In this paper, we investigate the design of a simple, compact configuration of practical isolator using a post-buckled element – an inverted L-shaped beam. The weight of the isolated mass is taken to act at the vertex causing the vertical member to buckle when the weight is sufficiently large. The static and harmonic base excited response of such a system are investigated by FE analysis and validated through experiments. The system demonstrates the achievement of high-static-low-dynamic stiffness and exhibits a correspondingly low fundamental resonance frequency. However, internal resonances of the isolator are also prominent in its frequency response

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