Abstract
Compliant bistable mechanisms are monolithic devices with two stable equilibrium positions separated by an unstable equilibrium position. They show promise in space applications as nonexplosive release mechanisms in deployment systems, thereby eliminating friction and improving the reliability and precision of those mechanical devices. This paper presents both analytical and numerical models that are used to predict bistable behavior and can be used to create bistable mechanisms in materials not previously feasible for compliant mechanisms. Materials compatible with space applications are evaluated for use as bistable mechanisms and prototypes are fabricated in three different materials. Pin-puller and cutter release mechanisms are proposed as potential space applications.
Highlights
Bistable mechanisms are proposed as a potential solution for latching or deploying space systems such as deployable solar arrays [1]
Compliant bistable mechanisms are monolithic devices with two stable equilibrium positions separated by an unstable equilibrium position. They show promise in space applications as nonexplosive release mechanisms in deployment systems, thereby eliminating friction and improving the reliability and precision of those mechanical devices. This paper presents both analytical and numerical models that are used to predict bistable behavior and can be used to create bistable mechanisms in materials not previously feasible for compliant mechanisms
Finite element analysis reveals that if the same design used in the pin-puller and cable cutter prototypes was fabricated in bulk metallic glass (BMG) rather than plastic, forces of over 400 N (90 lbf) could be achieved, ensuring that these mechanisms can be tailored to meet a variety of load requirements
Summary
Bistable mechanisms are proposed as a potential solution for latching or deploying space systems such as deployable solar arrays [1]. Smaller bistable mechanisms may be embedded into the matrix of the substrate to functionally lock the structure in its deployed configuration. Creating such mechanisms using compliant mechanism theory results in devices that are fabricated and do not create friction or require lubrication. The advantages of compliant mechanisms include increased performance, reduced or eliminated assembly, no friction or wear, fewer parts, lower cost, and lower weight These advantages make compliant mechanisms ideally suited for space or aerospace applications, where low weight and no lubrication are desirable [2]. The bistable mechanism does not require power to be held in either of its stable positions Such mechanisms could be integrated into deployment systems as non-explosive release mechanisms
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