Simulation and experiment investigation on structural design and reinforcement of pyrotechnical sliding micro-actuators

Based on the performance requirements of safety and arming devices in a micro-electro-mechanical fuse system, a type of pyrotechnical sliding micro-actuators were independently developed and modified for use in fuse arming devices of small caliber ammunition, independent of the ammunition launching environment. The modified type of actuator—a sliding micro-actuator with two restraining fins—can effectively reduce the required actuated fuel (initiating explosive) and increase the locking force. Experimental results of thrust tests, locking tests and critical fuel weight tests indicate the reliability of the modified structure, and clarify the structural dimension effect. Both the thrust force and slider deformation for the modified structure shared similar results in simulations and tests. In conclusion, the simply and easily fabricated pyrotechnical sliding micro-actuator with a step structure is able to ultimately perform both the anticipated braking and locking functions, and provides references for the structural design of fuse arming devices.

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