Nonlinear characteristics of compliant bridge-type displacement amplification mechanisms
Nonlinear characteristics of compliant bridge-type displacement amplification mechanisms
复制标题
柔顺桥式位移放大机构的非线性特性
DOI：
10.1016/j.precisioneng.2019.08.012
复制
发表时间：
2019-11-01
影响因子：
3.6
通讯作者：
Hu, Huajun
中科院分区：
文献类型：
--
作者：
Pan, Bo;Zhao, Hongzhe;Hu, Huajun
柔性桥式机构已被广泛用作位移放大器，但现有的数学模型大多基于线性假设，无法揭示非线性特性。在本文中，臂被视为可变厚度梁，涵盖集总和分布配置，因此通过考虑载荷效应，建立了柔顺桥式机构的非线性闭式模型。然后，讨论应用限制、位移放大比、输入柔量和执行器的影响，以定量评估设计参数的影响并捕获柔顺桥式机构的非线性特性。最后，通过有限元分析（FEA）和实验对解析模型进行了验证，结果表明该模型能够准确预测柔顺桥式机构的变形。
Compliant bridge-type mechanisms have been extensively utilized as displacement amplifiers, but most of the existing mathematical models were developed based on linear assumptions, incapable of revealing nonlinear characteristics. In this paper, an arm is regarded as a variable thickness beam that covers both lumped and distributed configurations, and thus a nonlinear closed-form model of compliant bridge-type mechanisms is developed through considering load effect. Then, application limitations, displacement amplification ratio, input compliance, and influence of actuator are discussed to quantitatively evaluate the influences of design parameters and capture the nonlinear characteristics of compliant bridge-type mechanisms. Finally, the analytical model is verified by finite element analysis (FEA) and experiments, and the results show that the proposed model can accurately predict the deformation of compliant bridge-type mechanisms.