北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (4): 707-712.doi: 10.13700/j.bh.1001-5965.2014.0297

• 论文 • 上一篇    下一篇

偏置弹簧对SMA驱动器输出性能影响规律

杨宝锋, 张小勇, 闫晓军   

  1. 北京航空航天大学 能源与动力工程学院, 北京 100191
  • 收稿日期:2014-05-23 修回日期:2014-08-20 出版日期:2015-04-20 发布日期:2015-05-08
  • 通讯作者: 张小勇(1983—),男,贵州安顺人,讲师,zhangxy@buaa.edu.cn,主要研究方向为形状记忆合金智能结构、航天机构、固体力学. E-mail:zhangxy@buaa.edu.cn
  • 作者简介:杨宝锋(1989—),男,陕西延安人,硕士生,ybf1000@qq.com
  • 基金资助:

    国家自然科学基金资助项目(11272025); 中央高校基本科研业务费专项资金资助项目(YWF-14-RSC-014)

Relationship between bias spring parameters and output performances of SMA actuators

YANG Baofeng, ZHANG Xiaoyong, YAN Xiaojun   

  1. School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-05-23 Revised:2014-08-20 Online:2015-04-20 Published:2015-05-08

摘要:

偏置弹簧参数对形状记忆合金(SMA,Shape Memory Alloy)驱动器的输出性能有着非常大的影响.为获得其影响规律,通过试验研究了不同偏置弹簧刚度以及不同弹簧预压缩载荷下,SMA驱动器的作动位移、响应速度的变化规律以及循环次数对驱动器性能的影响规律.试验结果表明,驱动器最大作动位移及响应速度随弹簧刚度或预载的增大而降低;驱动器性能在前几次循环中衰减较大,随着循环进行性能逐渐趋于稳定;弹簧预载的增大使驱动器性能稳定所需的循环次数减少,而弹簧刚度对驱动器输出性能的循环变化规律影响不大.

关键词: 形状记忆合金, 驱动器, 循环性能, 锁紧机构, 偏置弹簧

Abstract:

The parameters of the bias spring have great impacts on the output performances of the shape memory alloy (SMA) actuator. To investigate the rules of influences, the output stroke and response rate of a SMA actuator with different bias spring stiffness and precompression load were studied. The output degradation due to cyclic actuation was also investigated. Experimental results show that the strokes and response rates decrease with the increase of preloads or stiffness. The performance of the actuator degrades significantly in the first few cycles and stabilizes eventually with the increase of the number of cycles. The test results also indicate that less cycling is needed to stabilize the actuator when the preload is increased, and the stiffness seems to affect the cyclic performance of the actuator slightly.

Key words: shape memory alloys, actuator, cyclic performance, locking device, bias spring

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