The improvements of temperature-response of shape memory alloy and the trial manufacture of the three-dimensional positioning system.

提高SMA元件的热处理温度或对元件进行长期低温时效处理，对于改善SMA执行器的温度响应是有效的。表面面积大的带状元件比线状元件更能有效地改善温度响应。采用设定时间方法的电阻反馈控制系统提出了定位可以设定并保持在任意位置。研究了定位特性对控制距离和外载荷的影响。在此基础上，提出了一种新的不带偏移时间的电阻控制系统。该系统的位置控制精度不超过10μm。提出了新的塑性变形区动力学和本构方程以及考虑环境温度和相变潜热的传热模型，并用这些方程和模型模拟了位移随时间的变化。计算结果与实验结果吻合较好。利用这些技术制作了三维定位系统，并对其可操作性和可控性进行了检验。

It is effective for improving the temperature response of SMA actuator to raise the heat treatment temperature of the SMA elements or to give long-term low temperature aging treatment of elements. And the ribbon shaped element with large superficial area is more effective for improving temperature response than wire element. The resistance feedback control system using the method of setting off-time has proposed that positioning can be set and retained at an arbitrary position. The effect of positioning characteristics on control distance and external loads are investigated. Furthermore, the new resistance control system without setting off-time has proposed. This new system can be controlled position with accuracy less than 10μm. New kinetics and constitutive equations which are available to plastic deformation region and the heat transfer model in consideration with ambient temperature and phase transformation latent heat have proposed and the displacement with time is simulated by these equations and model. The calculation results coincide with those of experiments well. The three-dimensional positioning system using these techniques was produced and its operability and controllability were inspected.