Analysis of Frequency Spectrum Character of Acoustic Emission Wave from Hypervelocity Impact on Single-Sheet Plate

Due to the threat of impact to spacecraft from space debris,the space debris in-suit detection system was required.For developing the detection system based on acoustic emission(AE) technique,research on character of AE wave from hypervelocity impact should be taken.Experiments of hypervelocity impact on single-sheet plate were performed to obtain the AE waves with supersonic sensors,and the spectrum was analyzed with wavelet transform.The results indicated that in the range of impact velocity of 1～4km/s,the AE waves from hypervelocity impact mainly contains the plate waves with the modes of A0,S0 and S2.The waves of A0 mode weakens with the increase of velocity while the waves of other two modes strengthen.The waves from impact induced cavatition contain more A0 mode while the waves from impact induced penetration contain more S0 and S2 modes.With the concept of normal impact and radial expanding effects,the results above were illustrated.