基于固支-简支屈曲梁的旋转驱动双稳态柔顺机构  

Rotation-driven Bi-stable Compliant Mechanism Based on Fixed-pinned Buckled Beam

作　　者：徐玉龙 楼春钢 潘殿坤 伍章明 XU Yulong;LOU Chungang;PAN Diankun;WU Zhangming(Key Laboratory of Impact and Safety Engineering,Ministry of Education of China,Ningbo University,Ningbo Zhejiang 315211,China)

机构地区：[1]宁波大学冲击与安全工程教育部重点实验室,浙江宁波315211

出　　处：《机械设计与研究》2024年第2期105-112,共8页Machine Design And Research

摘　　要：与传统刚体机构不同,柔顺机构通过构件变形可实现位移和力的传递与转换,这可大大减少摩擦、润滑和装配。由于具有结构简单、变形大、易于加工等特点,双稳态屈曲梁成为常见的柔顺机构设计单元,在能量吸收、软体机器人、能量收集等领域被广泛应用。以固支-简支双稳态屈曲梁为研究对象,设计一种新型旋转驱动的双稳态柔顺机构。首先,基于能量法建立分析模型,用于分析双稳态屈曲梁在简支端旋转驱动下的跳变特性,预测屈曲梁的力矩-角度曲线和变形过程,并通过有限元模型和实验结果验证了分析模型的有效性;其次,利用分析模型、有限元模型和实验分析了预压缩量和几何参数对于双稳态屈曲梁力矩-角度曲线和最大力矩的影响;最后,基于双稳态屈曲梁的研究结果设计旋转驱动的双稳态柔顺机构并对其跳变行为进行有限元分析和实验验证。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.

关 键 词：屈曲梁 跳变行为 力矩驱动 柔顺机构 

分 类 号：TH112[机械工程—机械设计及理论]