Research On Micro Safe And Arming System

For the characteristics of MEMS technology,it has been more and more widely applied in Fuze.In order to achieve miniaturization of fuze and further improve the performance of the fuze,the MEMS safe and arming system in fuze choses MEMS mechanism instead of traditional electromechanical devices.This paper summarizes the existing micro-elastic element,time delay mechanism and micro-actuators which used in MEMS safe and arming system.And take the MEMS safe and arming system as the research object.This paper takes a further research on the micro-elastic element,time delay mechanism and micro-actuators used in MEMS safe and arming system and combines a variety of processing technology to complete the prototype.Its properties are tested.Firstly,this paper researches the liner range calculation method of S-type micro-spring from the point of material property and theoretical calculations and experimental results in an error of about 10%.The research shows that when the material property determined,the liner range of micro-spring will increases if the section number of micro-spring increase or the bend radius increases or straight beam sections increases or the micro-spring width decreases.For micro-spring prone to plastic deformation in high overload impact environment,this paper presents a micro-spring multi-objective optimization design method to meet the requirement of no plastic deformation in the fall and reliable motion of recoil insurance agencies in lunch.Limited by the space for microsystems the micro-elastic element in MEMS safe and arming system could not simultaneously provide adequate driving force and driving distance without plastic deformation,in this paper,a new approach for multilayer elastic beam used in MEMS safe and arming system is provided.If the effects of friction is ignored,the multilayer elastic beam will provides more driving force and driving distance than monolayer elastic beam when.This paper gives a design of dual watch delay mechanism without a drive train,and a dynamic simulation of its motion characteristic.For the existing symmetry Z-tooth MEMS delay mechanisms can not play sports in place under the influence of centrifugal force,this paper presents an asymmetric Z-tooth delay mechanism which can works reliably by weak environmental forces.This paper describes a new architecture for a pyrotechnic micro-actuator used in a micro-electromechanical safe and arming system of fuze.The micro-actuator is a surrounded by a half sandwich structure which consists of a package substrate,slider,gunpowder,ignition device and cover-plate with volumetric dimensions 4.7×4.7×2 mm3.We demonstrate that the slider in the pyrotechnic actuator keeps the metallic screen of the safe and arming system in a safe position before action.It also provides the driving force and driving 0.8 mm distance for the subsequent system after the pyrotechnic actuator is activated.It requires less than 1.5 ms for ignition and a power supply of under 4 V with a simple control circuit.Then,this paper combines a variety of processing technology to complete the prototype and complete the seal performance test,operating reliability and resistance to overload test performance testing to verify its safety and reliability.Last,based on the research on micro-elastic element,time delay mechanism and micro-actuators,this paper designs and fabricates a MEMS safe and arming system.Then,the safety and the arming reliability of recoil delay insurance agencies,performance of driving arming agency and system integration are tested.The result shows the MEMS safe and arming system of this thesis meet safety in usually processes and arming reliability in lunch.