Bistable Compliant Four-Bar Mechanisms with a Single Torsional Spring
Significant reduction in cost and time of bistable mechanism design can be achieved by understanding their bistable behavior. This paper presents bistable compliant mechanisms whose pseudo-rigid-body models (PRBM) are four-bar mechanisms with a torsional spring. Stable and unstable equilibrium positions are calculated for such four-bar mechanisms, defining their bistable behavior for all possible permutations of torsional spring locations. Finite Element Analysis (FEA) and simulation is used to illustrate the bistable behavior of a compliant mechanism with a straight compliant member, using stored energy plots. These results, along with the four-bar and the compliant mechanism information, can then be used to design a bistable compliant mechanism to meet specified requirements.
A. Mavanthoor and A. Midha, "Bistable Compliant Four-Bar Mechanisms with a Single Torsional Spring," 30th Annual Mechanisms and Robotics Conference, American Society of Mechanical Engineers (ASME), Jan 2006.
The definitive version is available at http://dx.doi.org/10.1115/DETC2006-99453
Mechanical and Aerospace Engineering
Keywords and Phrases
Bistable Mechanism Design; Four-Bar Mechanisms; Stable Equilibrium
Article - Conference proceedings
© 2006 American Society of Mechanical Engineers (ASME), All rights reserved.