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Design of a Double-Layer Electrothermal MEMS Safety and Arming Device with a Bistable Mechanism.

Authors :
Wang, Kexin
Hu, Tengjiang
Zhao, Yulong
Ren, Wei
Liu, Jiakai
Source :
Micromachines; Jul2022, Vol. 13 Issue 7, pN.PAG-N.PAG, 12p
Publication Year :
2022

Abstract

Considering the safety of ammunition, safety and arming (S&A) devices are usually designed in pyrotechnics to control energy transfer through a movable barrier mechanism. To achieve both intelligence and miniaturization, electrothermal actuators are used in MEMS S&A devices, which can drive the barrier to an arming position actively. However, only when the actuators' energy input is continuous can the barrier be stably kept in the arming position to wait for ignition. Here, we propose the design and characterization of a double-layer electrothermal MEMS S&A Device with a bistable mechanism. The S&A device has a double-layer structure and four groups of bistable mechanisms. Each bistable mechanism consists of two V-shape electrothermal actuators to drive a semi-circular barrier and a pawl, respectively, and control their engagement according to a specific operation sequence. Then, the barrier can be kept in the safety or the arming position without energy input. To improve the device's reliability, the four groups of bistable mechanisms are axisymmetrically placed in two layers to constitute a double-layer barrier structure. The test results show that the S&A device can use constant-voltage driving or the capacitor–discharge driving to drive the double-layer barrier to the safety or the arming position and keep it on the position passively by the bistable mechanism. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
2072666X
Volume :
13
Issue :
7
Database :
Complementary Index
Journal :
Micromachines
Publication Type :
Academic Journal
Accession number :
158298742
Full Text :
https://doi.org/10.3390/mi13071076