Trajectory Frying Analysis And Design Improvement Of Aeronautical Rocket Launcher

In order to improve the design of some aircraft rocket projectile electromechanical contact fuze,because the fuze ballistic explosion happened in live-fire training, and the contact fuze also has problem of low sensitivity、 poor reliability、 structure complexity of inertial impact switch、high cost.Based on the technical indicators of low recoil overload coefficient,the zigzag slot arming device was adopted in the improved fuze, and it’s necessary to evaluate the the arming perfoemance and the influence of cushion packaging.In order to discover the failure cause of the fuze ballistic explosion, the dynamic characteristics in theory and the kinematic simulation which was performed by using ADAMS of the two kinds of inertial impact switches(contact switch and universal switch) was analyzed,to compare the dynamic characteristics and ballistic safety of two kinds of inertial impact switches. The results indicate that:The centrifugal overload had greater effect on contact switch, the radial inertial force which is caused by the motion of projectile around the center of mass has greater effect on universal switch. The fuze ballistic explosion might be due to multiple resonance or high frequency oscillation, which might cause the inertial impact switch close accidently. Because of the lower radial acceleration threshold, ballistic radial shock vibration had greater influences on inertial impact switch.In order to evaluate the safety of fuze for which was packed by cushioning material, the research of transit oscillatory and 1.5 meter drop was conducted thorough its dynamic cushioning properties based on the ANSYS Workbench simulation analysis software. The dynamic characteristics of different cushion packaging structure、 materials under different fall plate indicate that:the cushion packaging reduces the destroy happened in handing of fuze because of the vibration and impact. Cushion packaging reduced the drop impact peak acceleration and increase the drop impact acceleration time. The drop impact peak acceleration of the packaged fuze had difference between different fall plate, while the drop impact acceleration time difference was small.To assess safety of zigzag slot arming device with package drop into fall plate, the packed fuze system mechanics model was simplified as a two degree system, using MATLAB software simulate the shock response property of the packed fuze system under half sine impulse excitation,obtaining the influences of safety of zigzag slot arming device with package drop into fall plate. The results indicate that effective measures could be taken to increase the safety of the fuze with packaging drop in in the actual design agencies of the zigzag slot and fuze package,such as taking down the frequency ratio, increasing zigzag device institutions, inspection of long storage of the fuse zigzag slot mechanism inertial spring elasticity, preventing the fuze package fall from above or have high drop speed.In order to evaluate the the arming perfoemance and drop safety of zigzag slot arming device,the mathematical model was established base on the stress analysis,obtaining the theoretical calculation results, using the ADAMS dynamic software to simulate its movement process, and the dynamic characteristics of inertial cone are obtained. The results indicate that: zigzag slot arming device can arm reliably under launch overload, and the device cann’t arm when droping into feature steel, concrete, sand and deal board at 1.5 m height. drop to the soft goal against service handles security more. Cushion packaging increased the inertial cone schedule, reducing the service handles security, therefore it’s necessary to limit use of cushion material.