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Abstract
In order to have fault identification for the gate rotor shaft with multiple cracks effectively, the quantity identification method of the gate rotor shaft with multiple cracks based on wavelet finite element method is established and the frequency test of the gate rotor shaft based on blind source separation algorithm is analyzed. Firstly the wavelet finite element was established by combining the Daubechies wavelet theory and the traditional finite element theory and then the vibration equations of intact and cracked wavelet finite element were obtained, which were applied to compute the changing rate of the natural frequencies for the cracked gate rotor shaft. Then natural frequencies fitting curve surface of the cracked gate rotor shaft with were acquired based on the wavelet finite element method and the identification procedure of the cracks was confirmed and the gate rotor shaft with two different cracks was analyzed and the results showed that the wavelet finite element could predict the multi-cracks correctly.
Highlights
Single screw compressors are used widely in petrochemical industry
In order to have fault identification for the gate rotor shaft with multiple cracks effectively, the quantity identification method of the gate rotor shaft with multiple cracks based on wavelet finite element method is established and the frequency test of the gate rotor shaft based on blind source separation algorithm is analyzed
Natural frequencies fitting curve surface of the cracked gate rotor shaft with were acquired based on the wavelet finite element method and the identification procedure of the cracks was confirmed and the gate rotor shaft with two different cracks was analyzed and the results showed that the wavelet finite element could predict the multi-cracks correctly
Summary
Single screw compressors are used widely in petrochemical industry. It has the merits of small volume, light weight, reasonable structure, reliable running, low vibration and easy maintenance and it is an advanced forward-looking compression. The operation of a single-screw compressor can be divided into four phases: suction, sealing, compression and discharge. It is mainly made up of a gate rotor and a screw rotor. For the complex structure, traditional finite element method has difficulty in recognizing the crack precisely and some difficulties such as poor robustness, low computing efficient are not avoided. This research will identify the multiple cracks of the gate rotor shaft of the single screw compressor based on the wavelet finite element method with
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