| Modern weapon system is gradually turning to integration,intelligence and miniaturization.Fuze,as an important part of weapon system,undertakes many functions such as environment perception,target detection,control initiation and safety assurance.At the same time,fuze is only a subsystem of artillery shell,which usually takes up little space,so it is necessary to carry out research in the direction of integration and miniaturization,which is becoming increasingly important.Compared with traditional mechanical technology,MEMS（Micro Electro-mechanical System）is one of the most popular technologies in recent decades.The development direction of modern fuze is highly consistent with the characteristics of MEMS technology.Therefore,aiming at the application background of medium and large caliber howitzer,a MEMS fuze safety and arming（S＆A）mechanism is designed by using MEMS technology.This paper summarizes the application of MEMS technology in fuze S＆A mechanism,and combined with GJB373B-2019 "Fuze Safety Design Criteria",defines the design idea of this paper,and puts forward a fuze S＆A system which is placed perpendicular to the shaft.At the same time,based on the analysis of the environment that the medium and large caliber howitzer shells may encounter in the life cycle,the insurance and arming methods of MEMS S＆A mechanism are determined.The three kinds of insurance are recoil insurance,centrifugal insurance and long distance release insurance（command lock insurance）.On this basis,starting from the reliability design,the circuit module of MEMS S＆A mechanism is designed,and the function of the circuit is verified by experiments.In this paper,based on the previous research work,aiming at the problems existing in the previous research,we focus on the improvement design.Firstly,for the recoil S＆A mechanism,the cantilever mass block is used to design,and its mechanical model is analyzed on this basis.Secondly,a centrifugal S＆A mechanism supported by two springs and combined with the locking hook mode is proposed,and the response characteristics under centrifugal load are analyzed,so as to improve the stability of centrifugal S＆A mechanism.Thirdly,this paper analyzes the remote S＆A mechanism.Finally,through the design of the lock head of the locking hook,the problem that the locking mechanism can not be locked at one time at high centrifugal speed in the early design is solved.In this paper,the mechanical mechanism is simulated by ABAQUS software,and the simulation analysis shows that the MEMS S＆A mechanism proposed in this paper can meet the requirements of medium and large caliber howitzer in theory. |
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