Rotation-driven Bi-stable Compliant Mechanism Based on Fixed-pinned Buckled Beam
Unlike conventional rigid body mechanisms,compliant mechanisms transform the displacement and force through the deformation of structural components,which can offer significant reduction in friction,lubrication,and assemblage.Bistable buckled beams have become the common design units for compliant mechanisms due to their characteristics,such as simple structure,large deformation,and being easy to manufacture,which are widely utilized in many fields,such as energy absorption,soft robots and energy harvesters.In this paper,a new rotation-driven bistable compliant mechanism is designed based on the fixed-pinned bistable buckled beam.Firstly,an analytical model is established based on the energy method to predict the snap-through behavior of the bistable buckled beam driven by rotation at the pinned end,which could obtain the moment-angle curves and deformation process.The finite element model and experiments are performed to verify the analytical results.Secondly,the influence of pre-compression and geometric parameters of the bistable buckled beam on the moment-angle curve and maximum moment are analyzed.Lastly,the rotation-driven bistable compliant mechanism is designed based on the results of the bistable buckled beam,and its snap-through properties are analyzed by the finite element model and experiments.
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