Mode Shape Description and Model Updating of Axisymmetric Structures Using Radial Tchebichef Moment Descriptors

A novel approach for mode shape feature extraction and model updating of axisymmetric structures based on radial Tchebichef moment (RTM) descriptors is proposed in this study. The features extracted by RTM can effectively compress the full-field modal vibration data retain most important information. reconstruction shapes using accurately describe shapes, simulation shows that function superior to Zernike terms its mathematical properties ability. In addition, correlation coefficient amplitude overcome main disadvantage assurance criterion (MAC), which has difficulty identifying double or close modes symmetric structures. Furthermore, appears be more efficient effective than normal method directly data, avoids manipulating large amounts speeds up convergence parameters. used analysis are demonstrated with a cover an aeroengine rig. frequency deviation between test FE was reduced from 17.13% 1.23% first 13 via process. It verified potential industrial application method.