Research On Dynamic Characteristics Of Fuze Ball Rotor Device

As one of typical fuze devices,the fuze ball rotor is widely used in small caliber antiaircraft gun,aircraft cannon and naval gun.It not only can ensure primary explosive safety,but also is one of arming delay devices.The research and analysis of fuze ball rotor device is aimed at increasing the arming delay of ball rotor fuze(the time of ball rotor turning right place)and reducing the dispersion of ball rotor arming delay,so as to improve the reliability of ball rotor fuze.Following aspects are included.First,the balanced equations of the starting moment of the ball rotor are studied in the case of the projectile nutation and the precession.Using the Euler dynamics theory of rigid bodies,the dynamic model of ball rotor in the case of projectile nutation and precession is obtained,then the equations of applied force of starting moment of fuze ball rotor are established.Second,the effect of eccentric center of gravity of ball rotor on ball rotor motion is studied.Matlab software is used to simulate the dynamic performance of the ball rotor with different eccentricity distance of the ball rotor.Get the relief distance corresponding to the different eccentricity of the ball rotor,and the curve of the nutation angle with time.Simulation results show that:under the same eccentricity,the starting position of the centroid coordinates(?M,?M,?M)and(-?M,-?M,-?M)is roughly the same.And the greater the eccentric distance is,the spread of the rotating distance of the ball will become more and more large.Third,use simulation software to study the process of arming movement of fuze ball rotor when there is no nutation,no precession and the rotation eccentricity is zero.ADAMS software is used to study the dynamic performance of the ball rotor of different materials of the ball rotor,whether the ball rotors were lubricated,whether the gravity condition is considered,and the spherical cavity was not the same.Get the corresponding curve of the nutation angle of the ball rotor with time,and the motion state process of the ball rotor.Simulation results show that:under the conditions of the same other conditions,the arming time of different material ball rotor is different,aluminum alloy ball rotor has the shortest delay,the second is the stainless steel ball rotor,plastic ball rotor has the longest delay.The arming delay will increase greatly after lubrication.,these show that the friction coefficient greatly affects the arming delay of the ball rotor when in the case of the same conditions.In the case of gravity acceleration,the arming time of the ball rotor is a little longer than that of the ball rotor without gravity acceleration.Gravity may lead to the failure of the ball rotor to be corrected in low speed projectiles.The arming delay of the ball rotor decreases with the increase of the space between ball rotor and cavity,and the he ball rotor may not be armed when the ball cavity is too large or too small.Fourth,the simulation software is used to study the movement of the fuze ball rotor in the case of eccentricity and the presence of nutation in the projectile respecttively.ADAMS software is used to study the dynamic performance of the fuze ball rotor during rotational eccentricity and projectile nutation respectively,get the corresponding curve of the nutation angle of the ball rotor with time.Imulation results show that:when there is rotational eccentricity,the ball rotor arming delay will be significantly reduced compared to when there is no rotational eccentricity,and the arming time of the ball rotor shortens with the increase of the rotation eccentricity.When the projectile nutation angle is not zero,the arming time of the ball rotor will be greatly reduced than that of the non projectile nutation,and the arming time of the ball rotor shortens with the increase of the initial nutation angle of the projectile.