On the detailed design of a quasi-zero stiffness device to assist in the realisation of a translational Lanchester damper
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Data
2022-02-01
Autores
Gatti, G.
Shaw, A. D.
Gonçalves, P. J.P. [UNESP]
Brennan, M. J. [UNESP]
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Resumo
A translational Lanchester damper is a device that adds damping to a structure at a point using a series combination of a viscous damper and a mass. The problem in the practical realisation of such a device is that a stiffness is required to support the mass, which changes the dynamic behaviour of the device, introducing a resonance frequency due to the interaction of the stiffness and inertia forces. This is a dynamic vibration absorber. To achieve a device that behaves broadly as a Lanchester damper rather than a dynamic vibration absorber, a very low stiffness is required, and this is the focus of this paper. The low stiffness is realised using a combination of linear springs and rigid links arranged with specific geometry into a compact device. Although the geometric configuration of the components leads to an inherently nonlinear device, the aim is to limit its working condition and exploit the linear-like behaviour. To this end, how the geometry affects the nonlinear behaviour is studied in detail, providing general guidelines for its design. A prototype Lanchester damper incorporating the low stiffness element was manufactured and tested on a single mode and two multi-modal vibrating structures.
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Palavras-chave
Essentially nonlinear stiffness, High-static-low-dynamic-stiffness, Nonlinear energy sink, Passive vibration control, Vibration absorber, Vibration isolator, Vibration neutraliser
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Mechanical Systems and Signal Processing, v. 164.