Launch Dynamics Modeling And Research On Vibration Control By Aerodynamics Force For Gatling Gun System With Light Tripod

Large caliber 吃 gun mounted on light tripod can bring the advantages of high power and high mobility. But it also brings the problems such as large recoil, poor stability and difficult to improve the firing frequency. In this dissertation, a big caliber self-energizing gatling gun system with a light tripod is as research subject, and the firing stability and firing dispersion as the core research content. Numerical calculation of the dynamic characteristics and firing dispersion of gatling gun mounted on light tripod base on multibody dynamics theory, gas dynamics theory and exterior ballistics are preformed, and the key influence factors are analyzed. Aiming at improving the firing stability, launch dynamic characteristics of gun system, muzzle brake and muzzle assistant-rotating principle, and vibration control mechanism of powder gas are carried out in depth study and exploration. The main contents are as follows:1. The launch dynamics model of large caliber self-energizing gatling gun system is established through the multibody dynamics modeling theory and considering the soil force and firing frequency change regulation of self-energizing gatling gun. Based on the muzzle dynamic response and external ballistic equations, gatling weapon external ballistic numerical model is built. Firing dispersion is analyzed through dynamics simulation and external ballistic calculation results, and as the evaluation of gatling gun stability criteria. Through the analysis of the relationship between fire density and muzzle dynamic response, the main factors that affect the firing dispersion are obtained. The results provide the research direction for improving firing stability of gatling gun system.2. Based on the gas dynamic equations of supersonic airflow, gas dynamic numerical model of high-efficient muzzle brake is established combined with variable mass thermo dynamics interior ballistic equations. Change regulations of recoil efficiency with the number of brake gas chamber, area and angle of channel are explored. Combined with the launch dynamic model of gatling gun system, influence of different muzzle brake efficiency on launch dynamics characteristics and muzzle response of gun system are simulated, and the effect of muzzle brake efficiency on improving the firing stability and firing dispersion are analyzed.3. According to the different support conditions of light tripod, influence of tripod support modes and stiffness on the firing stability is studied. Considering the actual combat situation of gatling gun, change regulations of firing stability and firing density while gatling gun with five different attitude angles are discussed.4. Muzzle assistant-rotating principle for self-energizing gatling gun system is studied. Based on variable mass thermo dynamics interior ballistic equations and gas dynamic equations, gas dynamic numerical models of two kinds of structure of muzzle assistant-rotating and recoil absorber are built. Combined with the launch dynamic model of gatling gun system, the efficiency of increase of fire frequency is calculated, and the changes of muzzle dynamic response are simulated. The results provide theoretical basis for muzzle assistant-rotating and recoil absorber applying to gatling gun system.5. Aiming at controlling the recoil torque acting on light tripod and reducing the free vibration of gun system, a scheme of powder gas outflow through nozzle to achieve vibration control is carried out. The gas dynamic numerical model of gas force stabilization device is built based on gas flow in quasi one dimensional unsteady flow equation and variable mass thermo dynamics interior ballistic equation, and change regulation of gas stabilization force with different parameters is discussed. Considering with the launch dynamic model of gatling gun system, the reduction effect of gas stabilization force couple on vibration of gatling gun system is calculated.Through the above studies, this dissertation finally formed a complete modeling theory and vibration control methods for high fire frequency weapon system supported by a light tripod.