Analysis of Performance and Characteristics of Electronic-Mechanical Arm-Fire Device at High Altitude

This study validated the performance of an electronic-mechanical AFD in a high-altitude environment by evaluating the burst pressure and ignition delay time required for the ignition of a solid propellant motor.After thermal vacuum cycling tests, the device successfully met the performance requirements, achieving a maximum burst pressure of 1901 psi and an ignition delay time of 1.30 milliseconds, satisfying the required parameters of 500 psi and 10 milliseconds, respectively.During high-altitude tests, pressure oscillation phenomena were observed due to combustion gas leakage caused by assembly defects in the CBT bomb.It was demonstrated that maintaining the integrity of the assembly's O-rings and threads is essential to prevent burst pressure reduction and contamination by combustion gases.When AFD was ignited under high vacuum conditions in CBT bomb, neither the ignition delay nor the time to reach maximum pressure was influenced by the level of vacuum.However, the maximum internal pressure within the CBT bomb exhibited a reduction of up to 11.7% at high altitude compared to sea level pressure, although it still satisfied the performance requirements. - , . 1901 psi 1.30 msec 10 msec, 500 psi . CBT