Test Research on Operational Deflection Shape and Operational Modal Analysis of Aeroengine Blade

摘要

The blade is a key part of aeroengines. It is necessary to investigate the modal parameters of blades for guaranteeing structural integrity. Operational deflection shape (ODS) and operational modal analysis (OMA) are all modal test methods for aeroengine blades. First of all. the theory of ODS and OMA is introduced separately. Then, the ODS and OMA test systems are established with the high frequency vibration table and scanning laser Doppler vibrometer. by which the ODS and OMA of aeroengine blade are researched within the range of 10 kHz frequency respectively. The natural frequencies and mode shapes of the blade are educed through ODS data, while the natural frequencies, mode shapes and damping ratios are acquired through OMA data. Finally, the two test results obtained by ODS and OMA are contrasted, which indicated the two results are consistent. It is proved that the two test systems of ODS and OMA in this study are designed reasonably, and the test results are analyzed validly.