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http://dx.doi.org/10.5573/ieie.2014.51.10.197

Design of Safety and Arming Device of the Fuze using Solenoid for Improving Safety  

An, Ji Yeon (Agency for Defence Development, Fuze Research Laboratory)
Jung, Myung Suk (Agency for Defence Development, Fuze Research Laboratory)
Kim, Ki Lyug (Agency for Defence Development, Fuze Research Laboratory)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.51, no.10, 2014 , pp. 197-203 More about this Journal
Abstract
The safety and arming device(SAD), one of the components of the fuzes, shall provide safety that is consistent with handling, storage, transportation, use, and disposal. In this paper, we describes the design of the SAD which includes the solenoid assembly and the solenoid driving circuit to improve the safety of the fuzes. The solenoid assembly consists of a coil assembly, a restoring spring, and a core. The solenoid assembly is added in the SAD as an additional safety device. In case of the normal circumstances, the core of the solenoid assembly restrains the $1^{st}$ and $2^{nd}$ safety devices of the SAD for those devices not to operate at all, so that the SAD can secure safety for storage, transportation, and use. In contrast, when the battery power is provided to the solenoid driving circuit just before the flight, the core confirms the power level and starts removing the restraint from the $1^{st}$ and $2^{nd}$ safety devices of the SAD, and then the SAD is able to change its mode from safety mode to armed mode. After firing, once the SAD's operations complete, the turned-on arming switch stops providing the power to the solenoid assembly automatically. It can reduce the power consumption at solenoid assembly. Therefore, the proposed solenoid driving circuit for the solenoid assembly not only unlocks the restrained solenoid assembly from the safety devices, but also saves the power consumption during the flight.
Keywords
Fuzes; Safety and Arming Device(SAD); Solenoid; Solenoid Driving Circuit;
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  • Reference
1 Henry W. Ott, Noise Reduction Techniques in Electronic systems, Wiley, 1976.
2 MIL-STD-1316E, "Fuze design, safety criteria for," Department of Defense Design Criteria Standard, July, 1998.