A Protective Structure for Electronic Systems Facing Artillery Launching Process

Abstract

Artillery launching is one of the extremely harsh environments faced by electronic systems. The commonly used potting protection will transmit the high-frequency vibration of the launching process to the electronic components, interfere with their internal structures (such as MEMS), and increase the probability of failure of the ammunition. This paper proposes a protective structure for electronic system facing artillery launching process. The structure can withstand the high-g acceleration, while filtering the high-frequency vibrations, so as to protect the electronic components in the ammunition. Firstly, we established a shock/vibration isolation model for the artillery launching process, and determined the ideal stiffness and damping ratio of the structure. Secondly, we designed the structure with a shock-resistant, low-rigidity spring and an adjustable liquid damper. The experimental result showed that the structure remained intact under the shock of about 35000g, and could filter the mechanical vibration above 500Hz. In addition, the damping ratio of the device could be adjusted between 0.04-0.26. Finally, we carried out shock experiments on several types of commercial chips with the protection of the structure. All of the chips had survived the shock of about 18000g without potting protection.