Research On Anti-High Overload Technology Of Missile-borne Telemetry Equipment

As a land combat weapon,artillery has an irreplaceable position in our country.The development of new artillery must be tested by test shells before it can be used in military equipment.The missile-borne telemetry equipment is fixed inside the projectile.During the launch of the projectile,the telemetry equipment has to withstand a high overload of tens of thousands of g,so the research on the resistance to high overload of the test equipment is very important.The telemetry transmitting antenna is fixed on the outer surface of the projectile.The gunpowder gas when the projectile is launched will ablate the antenna,and at the same time,it will bring two main forces to the fixed structure of the antenna:the positive tension caused by high-speed rotation and the shear caused by the heading acceleration.It is very important for the telemetry system to solve the problem of antenna ablation and force.The failure analysis of the telemetry equipment fixed inside the projectile is carried out,the protective shell of the equipment is designed through the principle of stress wave isolation,and the internal components of the equipment are fixed by the vacuum potting technology.Through these two protection measures,the purpose of resisting high overload of telemetry equipment is achieved.The solidworks modeling software is used to establish the model and load it into the finite element software Ls-prepost for pre-processing.The finite element analysis method is used to simulate and analyze the telemetry equipment under the impact environment to obtain the stress distribution of the protective structure in the environment.And simulate the different potting positions of the PCB board inside the protective structure,and get the position with the least stress.Aiming at the reliability of the missile-borne antenna in the gun-fire environment,a mounting structure and fixing method of the missile-borne antenna are designed,and the fixing method is theoretically checked.Verify the antenna structure and the force on the surface of the antenna and the projectile body through simulation,and the results show that all the forces are less than the allowable applied force of the structure.Finally,a high-speed test bench was used to test the reliability of the antenna under the rotating speed environment.The experiment showed that the amplitude of the voltage change of the rotating power-on and static power-on test antenna is very small,and the antenna structure is reliable.Finally,through the bombardment test,the reliability of the anti-high overload capability of the protective structure of the missile-borne telemetry equipment and the reliability of the patch antenna installation structure and fixing method were verified.