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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
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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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.
Vibration absorber, Vibration neutraliser, Vibration isolator, Nonlinear energy sink, Essentially nonlinear stiffness, High-static-low-dynamic-stiffness, Passive vibration control
College of Engineering