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Based on the 60 mm artillery grenade, a slow-release structure was designed to reduce the severity of ammunitions response to accidental thermal stimulation and improve the thermal stability of ammunitions. The slow-release structure was made of high-density polyethylene (HDPE) and connected the fuse and the projectile body through internal and external threads. To study the safety of the slow-release structure under artillery launching overload, mechanical analysis of the slow-release structure was simulated via finite element analysis (FEA). The impacts of various factors (e.g., fuse mass, number of threads, and nominal diameter of internal threads of the slow-release structure) on the connection strength of the slow-release structure were studied. A strength-prediction model based on the fuse mass and internal thread parameters was established by fitting the maximum effective stress of the slow-release structure. This led to good prediction results. In conclusion, this study provides references and theoretical support for the design of thermal protection structures insensitive to ammunition.

A target localization algorithm, which uses the measurement information from onboard GPS and onboard laser detector to acquire the target position, is proposed to obtain the accurate position of ground target in real time in the trajectory correction process of semi-active laser terminal correction projectile. A target localization model is established according to projectile position, attitude and line-of-sight angle. The effects of measurement errors of projectile position, attitude and line-of-sight angle on localization accuracy at different quadrant elevation angles are analyzed through Monte-Carlo simulation. The simulation results show that the measurement error of line-of-sight angle has the largest influence on the localization accuracy. The localization accuracy decreases with the increase in quadrant elevation angle. However, the maximum localization accuracy is less than 7 m. The proposed algorithm meets the accuracy and real-time requirements of target localization.