Separation Dynamics Modeling Of Multiple Warheads And Influence Analysis Of Deviation Factors

The guidance technology of multiple warheads combined with the advanced penetration device is one of the effective means to improve the penetration capability.In order to improve the penetration capability,it is necessary to improve the submarine guidance capability of the post boost vehicle and reach the requirements of simultaneously splitting multiple bullets.Although the multiple warhead separation process is short-lived,it is very complicated.The separation process is essentially a multi-body relative movement,but it is necessary to consider the influence of disturbance factors,deviation factors,etc.on the separation,to avoid collisions between the separation bodies,resulting in separation failure.Therefore,it is important to study the dynamic modeling and the analysis of the deviation factors of multiple warheads separation.This paper takes multiple warheads separation system as the research object,designs a separation device that meets the requirements of catapult separation scheme,combs the deviation factors of multiple warheads separation,and studies the separation kinetics of multiple warhead systems:To solve the problem of internal separation between bullet and warheads,the relative motion equation of the two-body relative movement is used to establish the relative equations of motion of the center of mass of the bullet and the warheads and attitude motion equations.The method of ejection separation,that is,the separation force generated by the separation impulse device,acts directly on the bullet head to perform load analysis on the separation system and derive the basic equation of dynamics.During the separation process,the relative motion of the separation body was analyzed,and collision detection and analysis were performed.An internal separation collision detection model was established based on the separation kinematics analysis.The constraint equation method is applied to the design of the separation device.The compression coil spring is used to generate the separation force.The stroke and the size of the mechanism are very suitable for missile separation.The structure is simple and the reliability is high.The separation guide mechanism is composed of four parts: a spring,a slider,a guide rail,and an inner sleeve.The compression coil spring is placed in the inner space of the guide mechanism.The separation device parameters that meet the multiple warhead separation requirements are designed and a dynamic verification model for single warhead separation is established.The Monte Carlo method was used to distribute the non-nominal design parameters of the sample separation to assess whether the single warhead was successfully separated and to verify the rationality of the separation device design.The main deviation factors affecting the separation are analyzed in the input parameters of the multiple warheads separation system.The error calculation and evaluation methods are given for the analysis of the impact of multiple warhead separation deviation factors.Based on the simulation results of multiple warheads separation dynamics,the determination of interference distances and the analysis of dynamic characteristics were performed,revealing the influence of unsynchronized unlocking,rigid coefficient deviation,and friction coefficient deviation on the dynamic characteristics of multiple warheads separation.Comprehensive analysis of the influence of deviation factors: The friction coefficient deviation has the greatest influence on the moving distance of the dangerous point,and the unsynchronized unlocking influence has the smallest impact on the moving distance of the dangerous point;the separation time is positively correlated with the unsynchronized unlocking error,the rigidity coefficient deviation and the friction coefficient deviation.Unlocking the unsynchronized deviations and friction coefficient deviations within a certain range will shorten the multiple warhead separation time.