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On the detailed design of a quasi-zero stiffness device to assist in the realisation of a translational Lanchester damper / G. Gatti, Alexander Shaw, P.J.P. Gonçalves, M.J. Brennan

Mechanical Systems and Signal Processing, Volume: 164, Start page: 108258

Swansea University Author: Alexander Shaw

  • Accepted Manuscript under embargo until: 6th August 2022

Abstract

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 t...

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Published in: Mechanical Systems and Signal Processing
ISSN: 0888-3270
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57555
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Abstract: 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.
Keywords: Vibration absorber, Vibration neutraliser, Vibration isolator, Nonlinear energy sink, Essentially nonlinear stiffness, High-static-low-dynamic-stiffness, Passive vibration control
College: College of Engineering
Start Page: 108258