| Unmanned aerial vehicle(UAV)has been widely used in military and civilian fields due to its advantages of low cost and diverse functions.The ground launch equipment is an important guarantee for the normal launch of UAV.When the UAV is launched,the jet generated by the rocket engine will adversely affect the strength and stiffness of the ground equipment.Therefore,it is of great significance to study the structural dynamic response characteristics of the ground equipment.Based on the idea of two-way fluidsolid coupling,this paper combines computational fluid dynamics with computational solid mechanics.The particle tracking method of lattice Boltzmann model is used to analyze the characteristics of gas flow field.The dynamic response of ground launching equipment is simulated by finite element method.The influence of gas jet on the dynamic response characteristics of ground equipment under different launching conditions is studied.The main research contents are as follows :(1)According to the overall requirements of the UAV launch system,the overall scheme of the UAV rocket booster launch is designed,and the three-dimensional modeling of the launch system is completed based on Creo software to prepare for the subsequent fluid-solid coupling simulation.(2)The structure characteristics of rocket gas jet were analyzed and studied.Based on lattice Boltzmann method and large eddy simulation,the flow field was simulated,and the fluid-solid coupling model of gas jet and ground equipment was established.(3)Through the numerical study of the stress and strain of the ground equipment at the launch angle of 15 degrees,20 degrees and 25 degrees,the influence of the launch angle on the dynamic response characteristics of the ground equipment is revealed.The results show that the changes of stress and strain with time under different emission angles are similar.With the increase of emission angle,the impact effect of gas jet on ground equipment is stronger,and the stress and strain increase.The structure of ground equipment has slight deformation but meets the emission requirements.(4)Combined with the actual launch conditions,the dynamic response characteristics of ground equipment under different ambient wind speeds are analyzed.The results show that the ambient wind speed can enhance the impact effect on the right side of the ground equipment and weaken the impact effect on the left side.The stress and strain of the ground equipment increase with the increase of wind speed.The dynamic response characteristics of ground equipment at different altitudes are studied.The results show that the increase of altitude makes the impact effect of ground equipment more significant. |
