Structural Design And Analysis Of Automatic Missile Mounted Vehicle

After World War II,all countries in the world have strongly realized that the combat efficiency of Fighter jets is one of the most critical factors in winning air battles.The aviation support equipment missile mounted vehicle is the most direct equipment related to the combat efficiency of Fighter jets,and it is also directly related to the research and development of the missile mounted vehicle to the improvement of our national defense forces.Through decades of exploration and research on the missile mounted vehicle,the mechanical,hydraulic,electrical and other disciplines have been applied to the vehicle,and the lifting,translation and rotation of the vehicle have been realized.Adjustments such as the coordination of missiles and hanging points still require manual adjustments by multiple staff members based on experience,and the safety,efficiency and accuracy of hanging bombs are still not high.In view of the above problems,this paper takes the missile carried by a certain type of Fighter in my country as an example to develop and design a new type of missile mounted vehicle that can move in all directions and automatically realize coarse and fine positioning.This paper mainly completes the following aspects:By analyzing the advantages and disadvantages of various types of missile mounted vehicle at home and abroad,the design parameters and performance requirements of automatic trailers were determined,and a design scheme of omnidirectional mobile platform combined with 6-degree-of-freedom positioning mechanism was proposed.The omnidirectional mobile platform is used to realize the coarse positioning of the hanging bomb,and the 6-DOF positioning mechanism is used to realize the precise positioning and hanging operation of the hanging bomb.The omnidirectional mobile platform adopts the Mecanum wheel drive method,determines the layout of the Mecanum wheel,and completes the selection of the Mecanum wheel,the frame structure design,and the selection of the drive system.The designed omnidirectional mobile platform has the characteristics of small turning radius,low body,easy automatic control and accurate control,and is suitable for moving in the narrow space under the wing.The 6-DOF positioning mechanism adopts the serial attitude adjustment method(CZXYBA).The C-axis rotary mechanism is located at the bottom of the 6-DOF positioning mechanism and is installed on the omnidirectional mobile platform.It adopts the servo electric cylinder to drive the rack transmission mode.The double thin gear structure reduces the backlash,reduces the influence of the rotary inertia of the positioning mechanism,and improves the the rotation accuracy.The Z-axis lifting mechanism is located in the second stage of the positioning mechanism.Four sets of servo electric cylinders are installed upside down on the rotary platform,with large bearing capacity and high adjustment accuracy,so as to realize the lifting and positioning of the missile.The XY plane positioning mechanism adopts the screw guide way to realize the precise positioning of the missile horizontally and vertically.The Baxis pitch mechanism and the A-axis roll mechanism are located on the top layer of the positioning mechanism.The pitch motion of the missile carrier is realized through the expansion and contraction of the servo electric cylinder,and the roll adjustment of the missile is realized through the friction wheel.The three-dimensional model of the omnidirectional mobile platform and the 6-DOF positioning mechanism of the automatic missile mounted vehicle is established.Using ANSYS to carry out finite element static analysis on the missile bracket,slewing platform and frame of the key components of the trailer,and verify the reliability of the designed components.The error analysis and calculation of the pitch mechanism and the slewing mechanism in the 6-DOF positioning mechanism are carried out,and it is verified that the adjustment error of the mechanism is less than the maximum allowable error of the scheme,which meets the design positioning accuracy index of the trailer and meets the design requirements.