Research On The Landing Buffer Of An Air-dropped Rocket Launcher

The rocket launcher has the characteristics of fast fire rate and fierce firepower,can form a strong fire cover in a short period of time,ideal for the assault weapons as airborne operations.If the rocket launcher could carry rocket projectiles when airdrop,which can be put into combat after simple finishing as airdrop process completed,this is undoubtedly of great significance for winning the battlefield.However,it is necessary to deal with the problem that the rocket projectiles impact landing overload is too large.With its unique advantages such as light quality,good folding performance and low cost,the cushion airbag has a wide range of applications in the fields of heavy cargo airdrop protection and return cabin recovery.Therefore,this paper applies the airbag cushioning technology to the feasibility of the rocket launcher airdrop,and combines the explicit dynamics theory analysis the safety of the rocket launcher airdrop with projectiles,focusing on the following aspects of work:(1)Meet the requirements of air and airdrop,combine the requirements of tactical technical indicators of rocket launchers,light-weight high-vehicle rocket launchers virtual prototype model are designed.The carrier was selected,replenish ammunition according to the operational use of the rocket launcher by replacing the launching box with a full-loaded car.The motion plan of the Aiming Mechanism was selected,the design of the Pitch Mechanism and the Rotating Mechanism was completed,and relevant calculation was carried out.A three-dimensional model of rocket launcher is established and the overall performance of the rocket launcher is analyzed.(2)The heavy cargo airdrop profile,buffering principle and method were introduced and analyzed.By comparing the advantages and disadvantages of different buffering methods,combined with the heavy cargo airdrop requirements,the cushion airbag was selected as the landing buffering method,and the plan of the rocket launcher-airbag airdrop system was designed according to the airdrop practice of the rocket launcher.Furthermore,determines the installation mode,material,layout and number of airbags.The airbag parameter configuration theory is used to design the relevant parameters of the cushion airbag.(3)Considering the importance of cushion airbag technology in mitigating impact overload,the airbag cushioning process is first studied,and a finite element model of the cushion airbag is established.Based on the uniform pressure equation,the control volume method is used in the LS-DYNA software to analyze the relevant factors affecting the cushioning properties of the airbag.The displacement,velocity,acceleration and airbag internal pressure curve of the equipment are obtained.(4)By simplifying the 3D model reasonably,the finite element model of the rocket launcher-airbag system landing impact is established,analysis of landing impact process of rocket launcher under different working conditions in LS-DYNA software.The simulation result shows that rocket launcher under normal and severe conditions,the overload and axial force of the rocket projectiles are all within the safe range,rocket launcher could bring projectiles is safe when airdrop.Under extreme conditions,rocket projectiles impact overload has increased significantly due to partial airbag failure,rocket projectiles is in danger.Under different landing conditions,the impact overload of the rocket projectiles in the upper part of the launching box is larger,the axial force of the middle rocket projectiles is larger.Airbag failure has a greater influence on the cushioning effects of the airbag system.