Development and Testing of a Bi-Stable Actuator based on a High Transition Temperature Shape Memory Alloy

摘要

Pyrovalves, i.e., valves actuated by a pyrotechnical device, are very often used in space propulsion systemsrnfor their fast response, high reliability, low mass and low cost. However, they are hazardous and single usernitems. Their operation induces shocks and can generate contaminants. If a slower actuation is required orrnpossible, shape memory-based actuators avoid the generation of shocks and contaminants while beingrnfully resettable and non-hazardous devices.rnThe goal of this project was to develop a bi-stable Shape Memory Alloy (SMA) actuator for a specific SlowrnActing Latch Valve with long life capability. The benefits of this actuator makes it interesting not only forrnvalve actuation but also for any device that has to be actuated in a smooth and reliable way.rnThis paper presents the development of a bi-stable actuator based on high temperature shape memoryrnalloys.