Design Of External Rifling Net Launching Device And Research On Launching Dynamic Behavior Of Traction Bod

Capturing black flying UAV with capture net is an effective method which can not only counter UAV but also perfectly capture uav prototype.Different from the conventional projectile launch,the opening motion of the net is completed by means of the traction of the traction body.In this paper,a net catcher launcher was designed based on the principle of outer rifling and high and low pressure balanced firing,and the mathematical model and simulation model of the movement process of traction body inside and outside the bore were established.The dynamic performance differences of traction body under different rifling types were compared.The experimental prototype was developed to verify the feasibility of the design of the trap launcher.Firstly,based on the design requirements and the working scene,the balance launcher is designed,and the principle of balance launching and diverging motion of traction body is determined.The high-pressure chamber body,barrel body,rifled outer tube,charge chamber cover and other components are designed in detail.The connection between the low pressure chamber and the bore was optimized and the pressure stabilizing chamber was proposed.And each high pressure chamber,low pressure chamber for theoretical strength check.Secondly,based on the design parameters,launch structure and classical interior ballistics theory of the designed trap balanced launcher,the internal ballistic mathematical model of high and low pressure balanced launch of outer rifling was established,and the motion equations of traction body under different rifling types were established according to different rifling types.Using fourth-order runge-kutta method to solve the interior ballistic curve,results show that the traction body in mixed grooves and axial acceleration of speed in the grooves in the early stage of the movement is consistent,and the maximum axial acceleration of more than qi grooves by about 12.86%,the maximum axial acceleration coming time point relatively neat grooves is around 0.8 milliseconds ahead of time.The firing angles of mixed rifling and gradual rifling are 150% and 182% of that of uniform rifling respectively.To explore the different positioning of the grooves mix of traction performance,the influence of emission results show that the traction body launch Angle with mixed grooves grooves in combination of movement and change,grooves mixed point closer to the muzzle,traction body launch Angle,the greater the launch Angle and axial grooves mixed point location changed a function.Furthermore,based on the spring mass method,the external ballistic model of the net flight was preliminarily established,and the flight process of the net with different rifling types was solved.The results showed that the span of the rifling with uniform rifling was 43.7% higher than that of the rifling with gradual rifling,and 27.2% higher than that of the rifling with mixed rifling.But at the same time,it takes a long time for the net to reach the effective spreading ratio,and the rifling ability of rapid spreading is weaker than that of the other two types.Finally,a finite element simulation model was established based on the display dynamics module in ABAQUAS software to obtain the specific launching process of the traction body out of the muzzle.The results show that "lever effect" will occur when the traction body exits the muzzle.The fulcrum of the lever effect is at the muzzle,thus causing the muzzle wear phenomenon.The degree of muzzle wear varies with different rifling types,and uniform rifling is the weakest.At the same time,due to the complex stress phenomenon of muzzle,the traction body will produce periodic oscillation after leaving the muzzle,and thus be subjected to the action of alternating load.Simulation results show that the vibration effect of traction body is the least when uniform rifling is used.