Design and Analysis of a Band Pass Setback Arming Mechanism in MEMS Safety and Arming Device

In this paper, a band pass setback arming mechanism of the MEMS Safety and Arming Device (SAD) is proposed. It is used to lock the movement of the U-shape electro-thermal actuator until arming conditions have been met and is capable of dual threshold (acceleration amplitude and pulse width) recognition. The recognition boundary has been determined, and only if the mechanism acted by load within the recognition boundary, can the latch be locked and the U-shape electro-thermal actuator be released. Mathematic model has been established according to the structural dynamics theory and the Castigliano’s second theorem. The numerical solution has been calculated, and the band pass effect has been demonstrated. Finite element model has been established and the recognition boundary of simulation results match quite well with that of theoretical results.