NDLI: A New Variable Stiffness Spring Using a Prestressed Mechanism

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Azadi, Mojtaba Behzadipour, Saeed Guest, Simon
Copyright Year	2010
Abstract	A novel design of a semi-active variable stiffness element is proposed, with possible applications in vibration isolation. Semi-active vibration isolators usually use variable dampers. However, it is known from the fundamental vibration theory that a variable spring can be far more effective in shifting the frequencies of the system and providing isolation. Geometry change is a common technique for building variable springs, but has disadvantages due to the complexity of the required mechanism, and slow response due to the inertia of moving parts. In the variable spring introduced here (VS), the stiffness is changed by force control in the links which corresponds to infinitesimal movements of the links, and does not need a change of geometry to provide a change of stiffness. This facilitates a fast response. The proposed VS is a simple prestressed cable mechanism with an infinitesimal mechanism. Theoretically the level of the prestress in the cables can be used to control the stiffness from zero to a maximum value that is only limited by the strength of the links. In this work, the statics, kinematics and stability of the VS are studied, the stiffness is formulated, and possible configurations of the VS are found.
Sponsorship	Design Engineering Division and Computers in Engineering Division
Starting Page	301
Ending Page	307
Page Count	7
File Format	PDF
ISBN	9780791844106
DOI	10.1115/DETC2010-28798
e-ISBN	9780791838815
Volume Number	Volume 2: 34th Annual Mechanisms and Robotics Conference, Parts A and B
Conference Proceedings	ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Language	English
Publisher Date	2010-08-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Statics Inertia (mechanics) Stability Vibration Dampers Vibration isolators Vibration isolation Cables Geometry Design Kinematics Stiffness Springs Force control
Content Type	Text
Resource Type	Article

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