Simulate And Design On The Test System For Simulating The Launch Environment Of Fuze Of Large Caliber Projectiles

In order to accelerate fuze development cycle and make fuze performance optimization more conveniently,a simulation test system for launching environment of large caliber projectile fuze is designed based on a 85 mm caliber cannons.Base on air dynamics theory and the theory of exterior ballistics calculation to complete the simulation for stability of the new projectile,application of interior ballistic theory and function fitting method to obtain the relationship between the charge and the K1 and muzzle rotational velocity,using numerical simulation to design the recovery device for test system and obtain the rule of projectile rotational speed with recovery process.The overall design of the simulation test system for large caliber projectile fuze emission environment is controlled by the activation test of the fuze battery.The test providing centrifugal and setback environment for the tested fuze,the design of the simulation system by changing the interior ballistic charge to change the setback environment by centrifugal rifled barrel with environmental change provided by a motor drive device;In order to facilitate the recovery design a light mass simulated projectiles,the flight stability performance of the projectiles is calculated by the basic theory of aerodynamics and FLUENT numerical simulation.The results show that the Magnus moment coefficient derivative of simulated projectile is 0.649-0.853 at a velocity of Mach of 438 rad/s and an attack angle of 1?9 degree at a velocity of 0.1 Mach.At 3141 rad/s,the Magnus moment coefficient derivative of the simulated projectile is 0.523-0.818 at the angle of attack of 1?9 degree,the stability factor of the emergency snail is greater than 1,and the dynamic stability factor satisfies the stability criterion.The results show that the projectile has good stability and dynamic stability.The statics software was used later to verify the reliability of the light mass simulation projectile under the bore pressure.Through theoretical calculation,choose suitable for motor speed control device,the rotational speed control device design;MATLAB prepared by the use of interior ballistics program,in the set conditions of the interior ballistic,the different length of tube provide different motion time,setback overload coefficient and muzzle rotational speed,when the tube the length is 810 mm.Calculation shows that when the tube length is 810 mm,the test fuze can be provided with a setback environment with a load coefficient of 1874-20000 g and a centrifugal environment with a muzzle rotation speed of 4185 r/min to 30000 r/min.in order to make the environment more convenient to adjust,get the functional relationship between the ballistic charge and the setback overload coefficient and the muzzle rotational speed under certain mass through the interior ballistics calculation and the matlab curve fitting method.Good recovery in order to test the fuze to get accurate test results,using LS-DYNA to calculate the recovery medium,and the effects of the rotational speed of projectile,with the test results show that the process of recovery,the projectile displacement in the longitudinal symmetry plane of the projectile will be much larger than that of the projectile in the transverse symmetry plane.The distribution of the soft medium in the longitudinal symmetry plane needs extra consideration in the recovery process.When the projectile is used as a recovery medium,the projectile velocity decreases from 232 m/s to 217 m/s at 1000 ?s and the surface pressure is 168 MPa,which can be used as recovery medium.