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| Memory alloy drive unlocking mechanism for a periscopic laser communication terminal |
| MENG Lingchen1,3,MENG Lixin1,2,ZHANG Lizhong1,2,ZHAO Honggang1,3,ZHANG Yiqun1,3 |
1.Changchun university of science and technology, National and Local Joint Engineering Research Center ofspace Optoelectronics Technology, Changchun 130000, China;
2.Changchun university of science and technology, Fundamental Science onSpace-Ground Laser Communication Technology Laboratory, Changchun 130000, China;
3.Changchun university of science and technology, Electro mechanic Engineering College, Changchun 130000, China |
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Abstract In order to meet the locking requirements of a servo-rotation system for a periscopic laser communication terminal, this paper proposed an unlocking mechanism based on shape memory alloy (SMA) wire.The laser communication terminal was ensured stably locked during satellite launch.Firstly, the mechanism used the spring component to realize the locking, and the heating memory alloy wire output the return stress to drive to unlock; then, the unlocking mechanism was optimized, and the locking force and the locking displacement were optimized by the lever principle; The balance between the locking force and the unlocking force of the unlocking mechanism was analyzed.In addition, the relationship between the unlocking time and the supply voltage and current was analyzed experimentally.Finally, the prototype was developed and the ground test of the aerospace environment such as high temperature and vibration shock was carried out.The experimental results show that the mechanism can provide 1 000 N locking force, stable and reliable locking under 90 °C, and the unlocking time can be stabilized within 3 s.The function and stability of the mechanism meet the launch requirements of spaceborne laser communication terminals.
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Received: 01 November 2017
Published: 15 June 2019
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