This paper presents a locking device which achieves in locking the rotary feed structure of a space-borne microwave
radiometer during the launch stage. This locking device employs two shape memory alloy (SMA) wires as the actuating
elements, and uses a self-locking structure to achieve the locking function. To improve the performance and reliability, a
redundant SMA wire and a step structure are employed. To validate the proposed SMA locking device, four prototypes
were fabricated and tested. The result shows that the locking device possesses the advantages of remarkable locking
performances, wide operation electric current and high survival temperature. Based on the test results, the locking device
has a great potential for the application of space rotary structures.
Xiaoyu Qin, Xiaojun Yan, Xiaoyong Zhang, Dianyin Hu, Weibing Wang, and Lianghai Li, "A SMA-based redundant actuation locking device for rotary feed structure using self-locking principle," Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98033C (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 24, 2016; Published: 20 April 2016); https://doi.org/10.1117/12.2218355.
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