Design And Simulation Of MEMS Bullet Fuze Safety System

Cluster munitions have great application potential and have been largely used in the war, because of their instantaneous rapid-firing, wide distributed area, great damage efficiency,etc.However, there has been a problem of highly dangerous dud rate, which gives rise to continuous threat to civilians and increases the burden and risk of removal after the war. But the Hazardous dud rate of cluster munitions is caused by the lou firing of submunitions fuze. It is necessary to conduct a study on the submunitions fuze in order to improve the firing rate and reduce the dud rate of cluster munitions. The technology of MEMS is used in isintroduced in this article.Which can significantly reduce the volume and save the fuze space with the aim of increasing "three-automatic " devices or achieving parallel redundancy function, thereby improving the firing rate.Firstly MEMS S&A structure characteristic and effect principle in U.S. patent NO.7316186B1are analyzed in this article, and then MEMS S&A design project adopting the "mechanical inertia safety logic" concept is proposed on this basis,and a virtual prototype of MEMS S&A is built.In this article, rocket fuze as the application background, MEMS S&A is made of setback arming device, delay arming device driven by micro-SMA actuators and interrupter.Secondly, the dynamics simulation with ANSYS/LS-DYNA software to MEMS S&A is carried on. The relation between zigzag teeth structural parameters and movement of setback slider is found out, the design of setback arming device is optimized.which can ensure the safety in the security service processing and can reliably arm the fuze in low emission overload. Under the existing elastic coefficient formulas for W-form planar microsprings, parameters of microsprings is optimized in order to meet different requirement,and is verified by statics finite element simulations.Based on the structure of MEMS safety systems design and analysis, The basic design steps and methoeds of aremastered.it can lay the foundation of the similar microdevices used in Fuze.