Research On Rigid-Flexible Coupling Dynamics Characteristics Of A Large Caliber Naval Gun Replenishment System

Naval gun has many advantages,such as powerful combat function,large number of ammunition,high reliability and strong anti-jamming ability.At the same time,the characteristics of large caliber naval gun,such as large ammunition mass,large length and variety of types,make it difficult to store and supply large caliber naval gun automatically.Therefore,the automatic supply and replenishment device adapted to the stability and impact resistance of large caliber naval gun has become the key problem of the automatic ammunition storage and launching system.In this paper,a single-channel,multi-purpose and high stability automatic supply and replenishment device for three kinds of ammunition,which can complete the stable vertical transportation and horizontal supply,is proposed by synthesizing the relevant ammunition supply and replenishment modes at home and abroad,considering the sea conditions,the launching impact conditions of naval guns and the particularity of ammunition shape.At the same time,the kinematics of the replenishment system is analyzed,and the relationship between ammunition movement and three parallel driving is judged.The trajectory of ammunition is analyzed and drawn by D-H method.The horizontal working interface of the replenishment system in the bottom cabin is determined to be the key node by analyzing the position of the equipment under the condition of rolling and pitching of the hull.It provides solid model and data basis for the establishment of rigid-flexible coupling dynamic model.Secondly,under variable load,disturbance,coupling and special working environment,the traditional multi-rigid-body dynamic model has low accuracy in solving the real-time response of mechanics and its dynamic performance,so the rigid-flexible coupling dynamic method is adopted.Combined with the special working environment of the supply system.In the field of rigid-flexible coupling dynamics,the spring-damp-mass system dynamics model of ammunition motion characteristics is established by using Lagrange method,and the displacement differential equation of ammunition with multi-degree of freedom is solved in the generalized coordinates.The parametric relationship between the generalized coordinates of ammunition and the external loads under extreme environment and disturbance conditions is established.Thirdly,based on the rigid-flexible coupling dynamics and ammunition replenishment mode,combined with the deformation of key components under impact conditions,the key timing and working process of the replenishment system are analyzed with multi-parameter and multi-level performance analysis,and the interactive control simulation method is used to simulate the replenishment system under the conditions of load impact,environmental fluctuation,different kinds of ammunition.The stationary characteristics,impact characteristics and ammunition pose characteristics of the horizontal feeding interface of the replenishment system are simulated and analyzed.Finally,chose three parameters,namely,the position of the pull-out claw axis,the contact stiffness between the pull-out claw and ammunition and the track width of the track disk,are selected as design variables,and the ammunition transfer stability,impact force and overturning moment of the replenishment system are optimized and analyzed.On the basis of rigid-flexible coupling dynamic modeling and dynamic characteristics analy sis,the correlation between each variable and Ammunition Transport stability,impact force and overturning moment is determined by DOE method.The AMGA algorithm is used to optimize the multi-objective,improve the stability of automatic replenishment system,reduce the impact force and overturning moment of projectile operation.