Research And Design Of The Dynamic Characteristics Of The Patrol Missile Fuze And The Inertia Switch

In order to make the loitering munition Fuze to meet features of reliable insurance in service process,relieving insurance reliably in launch process and firing reliably,three aspects were studied including drop impact properties of projectile,Fuze low-overload setback arming device and Fuze built-in universal inertia trigger switch.Under the premise in difficult to obtain structural parameters on the design of loitering munitions,for lack of fuze impact acceleration law research when dropped to the different media,using Finite Element Method to research it was proposed.The method used ANSYS/Ls-dyna software to establish a number of projectiles and different objectives drop test model,simulate drop impact properties of projectiles without package bottom down,drop impact properties of projectiles without package in different drop height,different attitude dropping towards different goals was summarized,comparative analysis shows that the credibility of the process is high,simulation results provide a reference for Fuze design especially low recoil load Fuze.In order to ensure safety and arming correctness of loitering munitions in service processing,patrol flight,attack process,ordered spheres separated type low-overload setback arming device which can identify a 6 g emission overload environment was designed.The motion of device was simulated by ADAMS software under 6 g,1000 g,10000 g overload,which verified its safety and arming correctness.The minimum force(overload)that would enable the device to release the insurance was known,which verified the agency resettable.To explore the impact of main design parameters of the device on performance of releasing insurance,the main design points are introduced.The impact of main design parameters of the device on performance of releasing insurance was simulated by ADAMS software including the friction coefficient between the parts,the insurance ball diameter,the number of insurance balls,insurance ball material.The results show:reducing the friction coefficient of the contact surface of moving parts,increasing the diameter of the insurance ball,increasing the number of insurance balls,choosing large density material ball can be taken to improve the reliability of releasing insurance,but at the same time,size of the body,processing accuracy,processing costs and other factors need to be considered.Otherwise it will improve insurance performance.In order to ensure the loitering munition Fuze built-in inertia switch sensitivity,for traditional inertia trigger switch required large inertia overload and axial space,a type of electrical connection paw holding ball and small universal mechanical inertia electric and percussion switch was simulated by ANSYS/LS-DYNA software which is suitable for ballistic environmental overload smaller occasions.Properly select the material of electrical connection ball,support tube diameter size and electrical connection paw size,the switch can meet the design requirements that switch will be communicated by 180 g shock overload in any direction,not be communicated by 40 g constant overload.In the design process appropriately reduce the electrical claw thickness,width or reduce the number of pieces,increase the length of the electrical connection claw piece,select a small elastic modulus material,metal material surface friction-reducing treatment or choose ceramic electrical connection ball decreasing friction,increase the diameter of the electrical connection ball can be accessed to make switch closed easier,otherwise it will be safer.