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Semi-active vibration isolation using a near-zero-spring-rate device:steady state analysis of a single-degree-of-freedom model

Krishna, Y and Shrinivasa, U (2009) Semi-active vibration isolation using a near-zero-spring-rate device:steady state analysis of a single-degree-of-freedom model. In: Proceedings of the Institution of Mechanical Engineers - Part D: Journal of Automobile Engineering, 223 (D11). pp. 1395-1403.

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Abstract

A vibration isolator is described which incorporates a near-zero-spring-rate device within its operating range. The device is an assembly of a vertical spring in parallel with two inclined springs. A low spring rate is achieved by combining the equivalent stiffness in the vertical direction of the inclined springs with the stiffness of the vertical central spring. It is shown that there is a relation between the geometry and the stiffness of the individual springs that results in a low spring rate. Computer simulation studies of a single-degree-of-freedom model for harmonic base input show that the performance of the proposed scheme is superior to that of the passive schemes with linear springs and skyhook damping configuration. The response curves show that, for small to large amplitudes of base disturbance, the system goes into resonance at low frequencies of excitation. Thus, it is possible to achieve very good isolation over a wide low-frequency band. Also, the damper force requirements for the proposed scheme are much lower than for the damper force of a skyhook configuration or a conventional linear spring with a semi-active damper.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Professional Engineering Publishing.
Keywords: zero spring rate;friction damper;semi-active;vibration isolation.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Ms G Yashodha
Date Deposited: 11 Jan 2010 07:46
Last Modified: 19 Sep 2010 05:53
URI: http://eprints.iisc.ac.in/id/eprint/25260

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