Bistable Buckled Beam: Modeling of Actuating Force and Experimental Validations

Compliant bistable mechanisms are a class of mechanical systems that benefit from broth compliance, allowing easy manufacturing on a small scale, and bistability, which provides two passive and stable positions. These properties make them first-class candidates not only for microswitches but also several other robotic appliances. This paper investgates the actuation of a simple bistable mechanism, the bistable buckled beam. It is pointed out that the position of the actuation has a significant impact on the behavior of the system. A new model is proposed and discussed, with experimental validations to compare central and offset loading, highlighting the strengths of each.

[1]  Y. Bäcklund,et al.  A lateral symmetrically bistable buckled beam , 1998 .

[2]  Mattias Vangbo,et al.  An analytical analysis of a compressed bistable buckled beam , 1998 .

[3]  Chang-Jin Kim,et al.  A bistable snapping microactuator , 1994, Proceedings IEEE Micro Electro Mechanical Systems An Investigation of Micro Structures, Sensors, Actuators, Machines and Robotic Systems.

[4]  S. Timoshenko.  Theory of Elastic Stability , 1936 .

[5]  Mohsen Shahinpoor,et al.  Design, prototyping and computer simulations of a novel large bending actuator made with a shape memory alloy contractile wire , 1997 .

[6]  J. O. Simpson,et al.  Ionic polymer-metal composites (IPMCs) as biomimetic sensors, actuators and artificial muscles - a review , 1998 .

[7]  Steven Dubowsky,et al.  Optimized binary modular reconfigurable robotic devices , 2003 .

[8]  J. Lang,et al.  A curved-beam bistable mechanism , 2004, Journal of Microelectromechanical Systems.

[9]  Larry L. Howell,et al.  Bistable Configurations of Compliant Mechanisms Modeled Using Four Links and Translational Joints , 2004 .

[10]  Jin Qiu,et al.  An electrothermally-actuated bistable MEMS relay for power applications , 2003 .

[11]  Jian Li,et al.  Optimal design of a bistable switch , 2003, Proceedings of the National Academy of Sciences of the United States of America.

[12]  Moustapha Hafez,et al.  Optimisation de mécanismes bistables : structures et actionneurs , 2007 .

[13]  Larry L. Howell,et al.  Design of two-link, in-plane, bistable compliant micro-mechanisms , 1999 .