Research of acoustic emission source location based on near-field beamforming
Shan Yingchun · 2012
A new acoustic emission source location method is presented based on near-field beamforming,that is,the acoustic emission source location method is established based the beamforming process of acoustic emission signals measured by a few sensors installed in small region.First,the propagation characteristics' differences between the acoustic signals and acoustic emission signals by using plate wave theory,and on the basis of these results the influencing factors in acoustic emission beamforming location is analyzed.Then,the present method is verified by artificial acoustic emission which is created by breaking a mechanical pencil lead on the surface of the plate.Finally,the present method is used to locate the rotor-stator rub fault occurring on the experimental device of rub fault,and identify rub position efficiently.The results show that it is an optional method for locating AE source.