Coupling Analysis Of Dynamic Behavior And Contact Lubrication State Of Tank Weapon System

Turret ring is the key components of tank weapon system,which is easy to occur lubrication failure under the harsh conditions such as low speed,heavy load,impact load and high temperature in the battle environment,and then it may lead to the inaccuracy and even failure rotation of the tank weapon system.On the other hand,it may aggravate the wear of the turret ring and cause the vibration of the turret and barrel,which can have a noticeable effect on the firing accuracy of the tank weapon system.Therefore,it is of great significance to study the lubrication mechanism of tank turret ring under battle conditions.By taken the typical ball/cross-roller turret ring as example,a coupling analysis method for dynamic behavior and contact lubrication state of tank weapon system is proposed.Considering the influence of the minimum film thickness,the contact parameter of the ball/cross-roller turret ring is obtained based on finite element method.On this basis,two sets of tank weapon system dynamics models considering the precise contact characteristics of ball/cross-roller turret rings are established based on the dynamics simulation software ADAMS,and then the lubrication performance analysis model of ball/cross-roller turret ring is established.The influence mechanism of single and automatic firing on the contact load,oil film pressure and oil film thickness of ball/cross-roller turret ring is analyzed.As for the automatic firing,the results show that the maximum contact load of the ball/roller is larger,the maximum oil film pressure in the contact area of the ball/cross-roller turret ring is larger and the minimum oil film thickness is smaller than single firing.The contact load,oil film pressure and oil film thickness of ball/cross-roller turret ring are analyzed under the influence of different launching loads.Compared with the cosine function and the linear function,the maximum contact load of ball/roller is the minimum,the maximum oil film pressure is the minimum and the minimum oil film thickness is the maximum in the contact area of ball/cross-roller turret ring under the exponential function.In consequence,the exponential recoil descent spectrum fitting function shows the best force and lubrication condition for the ball/cross-roller turret ring under the specific hitting ability(maximum recoil)index.The influences of different firing angles,such as depression angle,zero degree angle and elevation angle,on the contact load,oil film pressure and oil film thickness of ball/cross-roller turret ring are analyzed.As the firing angle increases,the maximum contact load of the ball/roller and the maximum oil film pressure increase gradually,and the minimum oil film thickness in the contact area of the ball/cross-roller turret ring shows an obvious opposite trend.The Elastohydrodynamic lubrication performance of ball/cross-roller turret ring is studied.It is found that the secondary peak of oil film pressure disappears with the increase of load at low speed and heavy load conditions.With the increase of the rheological index,the oil film thickness increases sharply.Therefore,it is favorable to select grease with a larger rheological index to extend the life of the ball/cross-roller turret ring.The coupling analysis method for dynamic behavior and contact lubrication state of tank weapon system in this paper can provide a theoretical basis for accurately obtaining of the bearing and lubrication performance of the tank turret ring and reasonably judging the lubrication state.It is of great engineering significance and military application value to make theoretical groundwork for further prevention of tank turret ring failure on the aspects of maximum firing load threshold,minimum automatic firing time interval and optimal firing load spectrum.