On the detailed design of a quasi-zero stiffness device to assist in the realisation of a translational Lanchester damper

• Autor(a) principal: Gatti, G.
• Data de Publicação: 2022
• Outros Autores: Shaw, A. D., Gonçalves, P. J.P. [UNESP], Brennan, M. J. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ymssp.2021.108258; http://hdl.handle.net/11449/222226
• topic: Essentially nonlinear stiffness; High-static-low-dynamic-stiffness; Nonlinear energy sink; Passive vibration control; Vibration absorber; Vibration isolator; Vibration neutraliser

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.