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The Application of Wavelet Finite Element Method on the Crack Recognition of the Gate Rotor Shaft of the Single Screw Compressor

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In order to carry out crack recognition of the gate rotor shaft with the crack effectively, the quantity recognition method for the crack of the gate rotor shaft depended on Daubechied wavelet was deduced. Firstly the wavelet finite plate element with thickness was constructed by combining the Daubechies wavelet theory with the traditional finite element technology, and then the vibration wavelet finite element formula was obtained, which was applied to solve the natural frequency of the gate rotor shaft with the crack. Then the top three order natural frequencies fitting curve surface of the gate rotor shaft with crack was acquired based on the wavelet finite element method. The intersection of the top natural frequencies contour lines could be used to recognize the crack of the gate rotor shaft. And the four kinds of cracks of the gate rotor shaft as an example were found out correctly. The numerical case study was carried out to verify the validity of the wavelet finite plate element for the crack recognition of the gate rotor shaft, which showed that the wavelet finite element method had high precious, and could improve calculation efficient.
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Keywords: CRACK RECOGNITION; GATE ROTOR SHAFT; WAVELET FINITE ELEMENT METHOD

Document Type: Research Article

Publication date: 2011-11-01

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