Design And Optimization Of Landing Cushion Airbag For Small Electronic Equipment

Aiming at a new type of separable flight data recording system and using the emergency data storage device as the buffer object,the design and optimization of the buffer airbag are carried out by theoretical calculation and simulation.Through the theoretical analysis of the process of single-chamber airbag falling to the ground,the mathematical model of the system is established and the influence of the presence or absence of the air exhaust hole and the size of the air exhaust hole on the cushioning performance of the single-chamber airbag is discussed.The results show that when the area of the air exhaust hole is too large,the airbag releases energy fast and the landing speed of the structure is large.On the contrary,when the area of the air exhaust hole is too small or the air exhaust hole is not arranged,the rebound of the airbag is obvious and the impact load of the structure is large.By simulating the process of the multi-chamber airbag falling to the ground and falling into the water,the change of the system state under different fall environment and attitudes is studied to determine designed airbag cushioning properties.Meanwhile,the factors affecting the cushioning performance such as the number of gas chambers and air amount are discussed.The calculation results show that the number of air chamber and the inflated volume greatly change the impact overload of equipment system.The closed airbag design scheme of four chambers with 0.070kg charged gas is given which is suitable for the working range of the buffer system attitude angle of 30~90°.Based on the ISIGHT optimization platform,reducing the overload peak of the electronic equipment as the optimization target and using the multi-chamber closed airbag design scheme as the reference,the global optimization algorithm and the approximate model are used to find the optimal shape of the airbag within the range of the given structure parameters.In addition,the cushioning performance of the combined airbag distributing different air exhaust holes and the buffer process under different initial fall attitude are studied by simulating the process of the combined airbag falling to the ground.The airbag design scheme is given which distributes four exhaust holes on the peripheral side of the outer airbag with total exhaust area of 0.002m~2.By comparing the optimized and initial results,it shows that the effect of these two optimal design schemes is significant.The research can provide references on the design and optimization of cushioning airbag for light and small equipment.