Memory alloy drive unlocking mechanism for a periscopic laser communication terminal

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 63-68.

MENG Lingchen1,3,MENG Lixin1,2,ZHANG Lizhong1,2,ZHAO Honggang1,3,ZHANG Yiqun1,3

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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.

Key words

Unlocking mechanism / memory alloy wire / spring / unlocking force / locking force

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MENG Lingchen1,3,MENG Lixin1,2,ZHANG Lizhong1,2,ZHAO Honggang1,3,ZHANG Yiqun1,3. Memory alloy drive unlocking mechanism for a periscopic laser communication terminal[J]. Journal of Vibration and Shock, 2019, 38(12): 63-68

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