Research And Optimization Of The Characteristics Of A Light Artillery Anti-rear Device

Lightweight howitzer is the current development trend of towed howitzer,improve the firing stability and accuracy of lightweight howitzer design is very important.Recoil resistance law is important factor on firing stability and accuracy.Taking the lightweight howitzer as the research object,study the influence law of recoil resistance on the firing stability and the initial projectile disturbance.Structure parameters of the recoil mechanism and firing stability and accuracy optimum matching design of lightweight howitzer is also studied.And by solving the finite element model with different general parameters,the impact of general parameters on firing stability and initial projectile disturbance could be identified.The main research contents are as follows:(1)This thesis combined with the domestic and foreign research progress of lightweight howitzer,and summarized the key technology of lightweight howitzer.The finite element model of a lightweight howitzer was established which was based on rigid and flexible coupling dynamics.Based on the secondary development technology in the finite element software,collaborative simulation of recoil mechanism could be achieved.By adjusting the structure parameters of the recoil mechanism,and we could attain different types of recoil resistance.In order to research the effects of the recoil resistance on firing stability,the finite element model was solved with different recoil resistance curve.(2)The projectile-barrel coupling dynamic finite element model of a lightweight howitzer considering contact-impact relationship between the projectile and barrel was established.On the basis of the dynamic model,the angular displacement,angular velocity and linear velocity were selected as the characteristic parameter to build the function of initial projectile disturbance.By solving the finite element model with different recoil resistance curve,the impact of recoil resistance on initial projectile disturbance could be identified.(3)Parameterized the finite element model,and created the approximation models combined the OLHD and different approximation technique.Evaluated the goodness of fit of different approximation models,and selected the right one to replace the original dynamic model.Used the model optimization technique,the following three researches of the recoil mechanism were progressed:the optimization calculation about parameters of throttling bar to improve firing stability,and reduce the initial disturbance of projectile.It could provide technical approach for recoil mechanism optimization design.(4)The structure parameters of recoiling parts have certain influence on firing accuracy.A dynamical finite element model based on projectile-barrel coupling was established for a lightweight howitzer,and the recoiling parts included breech parts,tube and break.By solving the finite element model with different structure parameters of recoiling parts,the impact of mass,mass center and couple arm on initial projectile disturbance could be identified.This research has the reference significance for the reasonable matching the structure parameters of recoiling parts.(5)On the basis of rigid and flexible coupling dynamics,the influence law of general parameters on the firing stability was acquired.Parameterized the general parameters of this lightweight howitzer,and then created the approximation to replace the original dynamic model.Through the sensitivity analysis,the parameter was founded,which has great influence on the firing stability.This above research had certain reference value for the general design.