Analysis Of The Cause Of Ballistic Bombing Of Mechanical Triggering Of Large-caliber Rotating Projectiles

In order to find the reason for mechanical fuze warhead ballistic burst of large caliber rotating projectile,and provides reference for large caliber rotary projectile fuze and its optimization design,a number of factors which are closely related to the trajectory burst of fuze,for example,the influence factors of nutation angle,projectile dynamic unbalance,force on the exterior trajectory of the fuze axial moving parts,and the dynamic response of the fuze axial moving parts in the complex environment are study on by theoretical analysis,simulation analysis and experimental verification.The manufacturing errors whice influence on projectile dynamic unbalance angle are calculated by Monte Carlo simulation.the conclusions are found that the dynamic imbalance angle obey the Rayleigh or Weibull distribution,and the biggest influence factor on the dynamic unbalance angle of projectile is the machining and assembling error of bottom row,the second one is the manufacturing error of shell nosing parts.Factors influencing the nutation angle analysed by multiple stepwise regression analysis method,conclusions are obtained that projectile eccentricity,assembly gap between fuze and projectile,and whether the projectile loaded in place are the significant factor in increasing nutation angle,when the projectile loaded in place,assembly gap between fuze and projectile is the most important influence factor,projectile eccentricity and stern swing are also very important.A mathematical model for the force of the initial segment of the external trajectory of the fuze is established,through analysis we found that not only the nutation angle and component rotation eccentricity are the important factor to increase the inertia force of fuze parts,dynamic unbalance angle of projectile and angle between the geometric axis of the fuze and the rotation axis of the projectile can also lead to a substantial increase in the inertia force of the fuze components.The dynamic response of fuze inertia trigger mechanism under complex environmental forces is analyzed by ADAMS software simulation,we found that the living organism is under the action of large intermittent friction,that the living organism will continue to move forward,but its movement to the lifting of the insurance time is not instantaneous,whether it is able to remove the insurance and the time required for the termination of the insurance by the combined effects of following factors,dynamic unbalance angle of projectile,the angle between the geometric axis of the fuze and the rotation axis of the projectile,nutation angle,assembly clearance of the living body parts and the casing of the delay device,the eccentricity of the center of mass of the living body relative to the rotation axis of the projectile,friction coefficient,etc.Finally,combining results of theory analysis,simulation analysis,experiment analysis,the occurrence of ballistic explosion reason is the comprehensive effect of the above factors,puts forward the preliminary suggestions on improving the projectile and Fuze.