Research And Experimental Verification Of Dual Mass Shock Amplification Method

The acceleration amplitude of electronic components such as rockets and missile fuzes has exceeded thousands of g under overload conditions,and the acceleration amplitude of the drop shock testing machine is generally not more than 600 g.In order to meet the high shock test requirements of microelectronic equipment,the acceleration amplitude of the drop shock testing machine must be increased.Using shock amplification to increase the acceleration amplitude of the drop shock testing machine is an effective method.Therefore,the research on the shock amplification method has certain engineering application value.In order to study the shock amplification method,firstly,the advantages and disadvantages of the three-mass collision and the double-mass collision to achieve the shock amplification method were analyzed,and the double-mass shock amplification method was determined as the focus of this paper.Based on the dynamic contact theory and the classical collision theory,a kinematic model of the dual-mass shock amplifier was established,and the theoretical calculation formula for acceleration and its amplification factor was derived.The structure of the dual-mass shock amplifier was improved,and the gap adjustment pad and hydraulic damping buffer were added,which solved the problem of the inadjustable drop gap of the dual-mass shock amplifier and the multiple collisions between the amplifier table and the drop table.Two structural design schemes of double mass shock amplifier were presented.After comparison,the second structural design scheme were selected for fabrication.Then the simulation analysis model of dual mass impact amplifier was established,and the correctness of the simulation analysis model was verified.The influence of the drop height,the mass of the magnifying platform,the stiffness of the elastic rope,the stiffness of the rubber waveform generator,and the drop clearance on the acceleration and its magnification were studied.Finally,a double-mass shock amplification experiment was carried out on the SY10-500 drop shock testing machine.The results show that the theoretical calculation,simulation analysis and experimental results of acceleration magnification are more consistent with the maximum error of 7.33%;the error between the simulation analysis of the acceleration amplitude of the amplifier and the experimental results is relatively large,and the maximum error is 11.08%.The main reason is that the acceleration waveform of the amplification platform obtained by the simulation analysis is a sine-like waveform,and the acceleration waveform of the amplification platform obtained in the experiment is a peak and thin waist waveform,which causes the acceleration amplitude of the amplification platform obtained in the experiment to be too large.This paper studies the double-mass shock amplification method,which increases the acceleration amplitude of the drop shock testing machine,and the acceleration amplitude is amplified by more than 10 times.The effectiveness of the dual-mass shock amplification method is verified,and a new method is provided for the high shock experiment of microelectronic equipment.