In order to obtain the time-varying law of the impact response distribution characteristics of the single stage light gas gun,the internal ballistic equation of the single stage light gas gun was con-structed based on the dynamic and high pressure theory,and a single stage light gas gun with a projec-tile mass greater than 1kg and a launching caliber of 50mm was developed.The time-domain,frequen-cy domain and time-frequency characteristics of the impact response were analyzed by testing the launching response of projectiles with different muzzle velocities and masses.The analysis of experi-mental test results shows that the constructed internal ballistic equation can accurately describe the re-lationship between projectile mass,pressure and other parameters and the muzzle velocity.The spec-tral density distributed over four frequency bands:400～460 Hz,732～742 Hz,1015～1035 Hz and 1 083～1416 Hz.The amplitude of the impact response spectral line increases linearly with the projec-tile exit velocity,and the distribution width of the spectral area narrows linearly.The projectile exit ve-locity has a more significant effect on the high-frequency time-varying concentration characteristics of spectral energy density distribution.It provides the most basic response spectral lines for the design and impact evaluation of pneumatic launch in related field applications.
关键词
一级气体炮/内弹道/冲击响应/时频分析/短时傅里叶变换
Key words
single stage light gas gun/internal ballistic/impact response/time frequency analysis/short time Fourier transform
维普
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