Optimal Design Of Airbag Chair For Manned Airdrop Protection

Airdrop is a very important means of troop transportation and materials supplication. It plays an indispensable role in modern warfare. And it will be applied more and more widely. Manned airdrop means that heavy equipment and passengers are parachuted at the same time. It is time-saving in the preparation of a war. Compared to the separation airdrop, manned airdrop technology improves the reactivity ability of army, the security of passengers and the battle effectiveness. In the manned equipment airdropping process, the damping and buffering techniques are required to provide sufficient protection via chair. But in the manned airdrop landing area, some problems are still existed in the protection of passengers. In practice, due to the poor chair's buffering performance, the passenger's neck and chest are usually injured. It is unable to meet the requirements of a safe landing.To solve the problems, this research is carried out as following.1. The airbag chair structure is first determined by analyzing the working principle of different types of airbag and the specific circumstances of the manned equipment airdrop. The factor of airbag chair size is derived via energy conversion principle and the basic equation of the Newton's law. It provides the basic design criteria of airbag chair size and structure. According to the internal equipment space requirements, manned capacity and ergonomics principles, the design of airbag chair is carried out in the man-machine engineering analysis subsystem of UG.2. A shoulders-to-waist belt is designed to fix the body and an airbag for neck protection is designed according to the statistics of injury in manned airdrop. The boundary conditions are first developed and the material type, contacts, constrains, parameters are then defined. Finally, the numerical simulation model of the human body buffer has been established.3. The buffering process of the airbag chair to the human in airdrop landing is simulated through MADYMO. And the effect of dynamic characteristic parameter in passenger's neck injury and chest injury is analyzed.4. An airbag chair's cushion dynamic model and a multi-objective optimization model of dynamic characteristic parameter are established. An optimization procedure based on the micro multi-objective genetic algorithm is proposed to search the key dynamic characteristic parameters. Two kinds of airbag chair optimization results are evaluated via injury criteria.