TAILIEUCHUNG - Acoustic Waves From Microdevices to Helioseismology Part 6

Tham khảo tài liệu 'acoustic waves from microdevices to helioseismology part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 188 Acoustic Waves - From Microdevices to Helioseismology using the suggested signal processing a gearbox was installed in the test rig system. Misalignment was created by twisted case caused by arc-welding to fix the base and bearing inner race fault is generated by severe misalignment. To identify the sensing ability of the AE vibration signal was acquired through accelerometer and compared to the AE signal. Also to find the advantage of the proposed signal processing method it was compared with traditional envelope analysis. According to the experiment result AE sensor can detect the fault earlier than an accelerometer because of high sensitivity and in the power spectrum the harmonics of the rotating speed and the gear mesh frequency clearly occurred. Misalignment was observed and bearing faults were also detected in the early fault stage. The proposed envelope analysis is worked to evaluate the faults and indicated the faults frequencies rotating speed sideband of BPFI gear mesh frequency and harmonics explicitly. For the detection of the crack growth on the shaft a cracked shaft was installed on the test rig and the crack was seeded by wire-cutting with mm depth. The cracked shaft was lifted mm by the lifting tool. The AE signals were transformed by FFT to create the power spectrums and in the spectrums several peaks were occurred by the crack growth. Along the growth of the crack the characteristic of the power spectrum was changed and displayed different frequencies. In the power spectrum it was shown that the harmonic components of the rotating speed and bearing cage frequency were excited by the crack growth as shown in the Fig. 6 especially on the 3X and 31Hz. And the AE signal caused by the crack growth is generated on the whole ultrasonic frequency range the initial crack could be detected using the PAC-Energy on wavelet level 1 to 4 and after that it could be presented on wavelet level 5 until the fracture of the shaft. Therefore in .

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