Share Email Print
cover

Proceedings Paper

Shape Memory Alloy (SMA)-based launch lock
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Most 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 free motion of the shaft, 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.

Paper Details

Date Published: 10 April 2014
PDF: 7 pages
Proc. SPIE 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 90613L (10 April 2014); doi: 10.1117/12.2045355
Show Author Affiliations
Mircea Badescu, Jet Propulsion Lab. (United States)
Xiaoqi Bao, Jet Propulsion Lab. (United States)
Yoseph Bar-Cohen, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 9061:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
Jerome P. Lynch; Kon-Well Wang; Hoon Sohn, Editor(s)

© SPIE. Terms of Use
Back to Top