Research on Extraction Method of Sensitive Feature of Thin-wall Plate Crack Fault

In this paper, the research on vibration simulation and signal analysis technology of thin-wall plate crack fault is mainly carried out. First, the 3D structure of the thin-wall plate is established, and a semi-elliptical crack in the root of the thin-wall plate is introduced. Based on the vibration simulation response of cracked thin-wall plates under variable working conditions, the vibration signals of normal thin-wall plates are compared and analyzed, and the sensitive feature of cracked thin-wall plates is extracted by wavelet packet analysis. The thin-wall plate test pieces required for producing fatigue cracks are prepared, and tested on the shaking test rig. Finally, the simulation technology of the cracked thin-wall plates under variable working conditions, the signal analysis methods and the sensitive feature of the cracks are verified.