Modal analysis of the impeller based on 3D-SLDV and high speed 3D-DIC technology
The full-field mode shape is important for studying the structural dynamic characteristics of the engine structure.The test principles of two full-field vibration test methods based on 3D-SLDV and high-speed 3D-DIC are introduced.Taking the impeller of liquid rocket engines as an example,the natural frequency and mode shape of the impeller within 5 kHz are obtained by using two technologies respectively,and the advantages and disadvantages of the two test methods are compared and analyzed.Compared with 3D-DIC,the displacement noise floor of 3D-SLDV technology is lower,which is more beneficial to the identification of high-frequency mode shapes,but this method belongs to the point-by-point scanning test,and the test time is long.3D-DIC technology collects the full-field data simultaneously,its acquisition time is short,and it has a more refined mode shape.However,the amount of image data is large,and it takes a long time to download and analyze the data.At the same time,this displacement-based measurement method cannot identify the displacement below the noise floor.
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