Research On Key Technologies Of MEMS Safety System

Aimed at the trend of dexterity,intelligence and miniaturization of modern fuze,a MEMS safety system of medium and large-caliber grenade was proposed.It relies on independent double environment and ballistic real-time information to ensure the safety of fuze.The design of safety and arming device,the fusion design of flame-proof mechanism and high explosive train were studied by combining theoretical analysis with numerical simulation.The basic requirement of MEMS safety system and its working environments over the whole life cycle were analyzed.The overall design scheme of MEMS safety system was put forward,which is suitable for large-caliber ammunition with more obvious set-back and spin overload.Then the performance targets of MEMS safety system such as environment recognition,volume and anti-high overload were determined.Through the analysis of the response characteristics of spring mass system under two kinds of impact acceleration of launch and drop environment,a MEMS setback cantilever latch was designed.Then the model was simulated by ABAQUS,and simulation result shows that the MEMS setback cantilever latch can recognize the normal launch overload and drop impact,that is,it ensures that the fuze can be in a safe state when meeting drop environment and the set-back can be removed reliably under launch environment.Based on the redundant safety and arming guidelines of fuze,the centrifugal safety mechanism was designed.The sequence of safety and arming device was determined by interlocking mechanism.According to the real-time information of ballistic trajectory,the method of driving the command lock through the electric actuator to realize the long-distance insurance was proposed,which can not only ensure the safety distance of the muzzle,but also can control the whole trajectory safety.Based on the integration of safety fuzing,the fundamental theories of explosive train,detonation and simulation were analyzed.Combined with the characteristics of MEMS flameproof mechanism,the high explosive train was designed.Then the design scheme of explosive train by driving flyer was proposed.The explosive model was studied by LS-DYNA simulation to analyze the effects of charge size,flyer thickness,and flyer material on the detonation transfer performance.The resule shows that it can not only guarantee the safety of the flameproof but also the reliability of detonation transfer,when the size of primary explosive is ? 1mm x 1mm and the thickness of the flameproof slider is 0.8mm.The prototype of MEMS safety system was designed and the technological scheme of MEMS safety and arming device was studied.Based on the multilayered UV-LIGA technology,the prototype of MEMS safety and arming device was processed,then the static performance tests were taken to analyze the machining errors and put forward corresponding improvement measures.