Research On The Safety And Unsecured Device Technology Of Medium And Large Caliber Rotating Projectiles

In order to provide a reference for the design of safe and arming device of the middle and large caliber rotating projectile fuze,the enviroment of safe and arming device in whole life was analyzed and its fluence to key components of safe and areming device was studied by theoretical analysis,simulation and experiments.In order to make sure the influence to the design of delay arming mechanism of runaway escapement caused by the difference between the rotating test and the hammer test environment and the ballistic environment,using theoretical analysis and experiments to do that research.The results show that the difference between the rotating test environment and the actual environment will result in the strength test results of gear teeth,and the test results of the arming of the delay arming mechanism of runaway escapement are different from the actual results,which can improve by changing the parameters of experimental leaf spring.The difference between hammer test environment and the actual environment is reflected in the magnitude and duration of setback overload and reversed addtional overload.In order to make sure the influence to self-destruction time caused by service environment and production environment,and its distribution characteristic and the law of production variation,the means of mathematical statistics and the range test data were used to do this study.The results show that the service environment hasn’t obvious effect on self-destruction time of centrifugal steel ball self-destroying device,but the production environment has.The self-destroying time of two kind of fuze which self-destructed by centrifugal ball self-destroying device obey lognormal distribution and other three kind of distribution.The self-destroying time of three kind of fuze which self-destructed by powder obey Burr distribution.As the growth of the production history,fuze self-destruction time is likely to drift and the distribution interval may change,so the manufacturer should pay attention to this in the process of production.The prediction model of law of production of self destruction time has a very good fitting effect.In order to make sure the influence to centrifugal pin locking device caused by terminal ballistic environment,the mechanical analysis and finite element simulation software ANSYS/LS-DYNA is carried out to do this study.The results show that the centrifugal pin locking device can work reliably in terminal ballistic environment.The working reliability of the centrifugal pin locking device increases first and then decreases with the increase of the angle.The lower rotating speed is,the penetration environment has greater influence on the working reliability of the centrifugal pin locking mechanism.The greater speed to the earth,the penetration environment has greater impact on the working reliability of the centrifugal pin locking mechanism.In order to make sure the influence to self-destruction time which caused by trajectory correction environment,ADAMS software and theoretical analysis are combined with to do this study.The results show that whether impulse parameters of pulse motor recovery correction mechanism has effect on the working reliability of the centrifugal pin locking mechanism when it is on the trajectory depends on rotating speed,speed,friction coefficient,pin’s position,the rotor’s centroid position,reverse recovery pin spring stiffness and pulse impulse.The resistance correction will not affect the working reliability of the centrifugal pin locking mechanism.The combined correction of the resistance device and anti-rotation flaps has no influence on the trajectory of working reliability of the centrifugal pin locking mechanism,but it will indirectly affect the terminal ballistic environment of the working reliability of the centrifugal pin locking mechanism and whether the influence is acceptable depend on the attenuation ratio between speed and rotational speed.The influence of fixed duck rudder to the centrifugal pin locking mechanism can be ignored.