Indication Of Pyrotechinic Impact Environment And Design Of Shock Absorber

The transient load generated by the initiation of pyrotechnic separation device on spacecraft will bring high frequency and high amplitude transient response to the structure.Some sensitive components on spacecraft(such as crystal vibration,relay,small lightweight structure,etc.)are prone to performance failure or even structural damage under the effect of pyrotechnic impact load which is fatal for a space mission.Therefore,it is of great significance for the success of space missions to simulate the impact environment of pyrotechnics on spacecraft and design the impact reduction scheme.This paper studies the simulation of pyrotechnic impact environment and the pyrotechnic impact reduction device.Aiming at the simulation of pyrotechnic impact environment,a pyrotechnic impact environment model is established,and ANSYS/ LS-DYNA is used for finite element analysis to obtain the pyrotechnic impact environment at sensitive locations.The effects of explosive quantity(M),thickness of lower end plate(t),material of lower end plate,screw diameter(d)and length(l)on the pyrotechnic impact environment of sensitive positions were analyzed.It is found that the amount of explosive(M)mainly regulates the amplitude of the acceleration response spectrum of sensitive positions,and the thickness of lower end plate(t)has a significant influence on the frequency information of the acceleration response spectrum of sensitive positions.When using the pyrotechnic impact environment model,the expected pyrotechnic impact environment should be obtained mainly by adjusting explosive quantity(M)and thickness of lower end plate(t),supplemented by adjusting other parameters.In this paper,according to the investigation,four kinds of impact reduction devices are designed,reduction device 1 a cylindrical transition section with a radius of 4cm and a thickness of 3cm,on the basis of reduction device 1,different types of holes were dug by reduction device 2 and reduction device 3 respectively,reduction device 4 is a transition section made of steel and aluminum..And in this paper,the impact effects and characteristics of four kinds of impact reduction devices are analyzed by using finite element method.The impact test based on the light gas gun verifies the impact effect of the impact reduction device,and the simulation results are in good agreement with the experimental results,proving the effectiveness of several kinds of impact reduction devices.The effect characteristics of different equipment with different materials on different positions of test board were analyzed.It is found that the closer the structure is to the impact source,the better the effect will be if the damping device with higher stiffness is adopted,and the more distant the structure is from the impact source,the better the effect will be if the damping device with lower stiffness is adopted.With the increase of the distance between the structure and the impact source,the impact reduction effect of the device decreases gradually.The research results of this paper provide a basis for the numerical analysis of sensitive components in the pyrotechnic impact environment and have certain guiding significance for the design of pyrotechnic impact reduction device.