偏动式双程SMA驱动器工作机理与能量转换研究

研究了偏动式双程SMA驱动器的工作机理 ,建立了驱动器输出力、输出位移、负载与驱动元件弹性刚度和预变形之间的变量关系。基于热力学基本定律 ,给出了双程SMA驱动器工作过程中能量的周期性流动、转移和转化模型 ,指出双程SMA驱动器双程做功的能量都来源于SMA元件的相变弹性势能 ,能量的一部分用于来程做功 ,一部分在来程转移给偏置元件 ,用于回程时做工 ,还有一部分被释放掉。

Study on Work Mechanism and Energy Transition of the Bias Two Way SMA Actuator

In this paper the work mechainism of the Bias Two Way SMA Actuator is investigated,the quantitative relationship of the output force,output displacement and load of the actuator and the elastic stiffness and predeformation of the driving component is constructed.Based on the basic law of thermodynamics,the periodical flowing,conveying,and transformation model of the energy in the work process of the Bias Two Way SMA Actuator is constructed.The paper indicated that,the round voyage energy of the Bias Two Way SMA Actuator all come from the elastic potential energy of the SMA component initiafed by phase fransformation.Part of the energy does work at come stroke,part is conveyed to the bias component,they do work at return stroke,another is released.