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Shape Memory Alloy (SMA)-Based Launch LockMost NASA missions require the use of a launch lock for securing moving components during the launch or securing the payload before release. A launch lock is a device used to prevent unwanted motion and secure the controlled components. The current launch locks are based on pyrotechnic, electro mechanically or NiTi driven pin pullers and they are mostly one time use mechanisms that are usually bulky and involve a relatively high mass. Generally, the use of piezoelectric actuation provides high precession nanometer accuracy but it relies on friction to generate displacement. During launch, the generated vibrations can release the normal force between the actuator components allowing shaft's free motion which could result in damage to the actuated structures or instruments. This problem is common to other linear actuators that consist of a ball screw mechanism. The authors are exploring the development of a novel launch lock mechanism that is activated by a shape memory alloy (SMA) material ring, a rigid element and an SMA ring holding flexure. The proposed design and analytical model will be described and discussed in this paper.
Document ID
20160005615
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other
External Source(s)
Authors
Badescu, Mircea
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bao, Xiaoqi
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bar-Cohen, Yoseph
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 2, 2016
Publication Date
March 9, 2014
Subject Category
Space Transportation And Safety
Spacecraft Design, Testing And Performance
Distribution Limits
Public
Copyright
Other
Keywords
launch lock
flexure
shape memory alloy

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