Title- Vibration Monitoring of a gearbox The top Figure shows the cross-sectiona

Question

Title- Vibration Monitoring of a gearbox The top Figure shows the cross-sectional and side views of a gearbox used in marine industry. This gearbox is mounted on a support structure for a test. The impact test carried out [while the gearbox is stationary] displays the spectrum shown in the bottom Figure Referring to this vibration spectrum, comment on all the input speed of the gearbox in RPM [maximum 3000 that may result in large amplitude during the test. RPMt Reduction from vertical input shaft with 10-teeth Bevel gear to the first Horizontal shaft 1 1 with 34-teeth Spur gear 2nd Reduction from the first Horizontal shaft with 18-teeth Spur gear to the second Horizontal shaft with 44-teeth Spur gear. 3rd Reduction from the second Horizontal shaft with 12- teeth Sput gear to the final output shaft through 41-teeth Spur gear 320 200 Amplitude (dB) 140 100 200 300 400 500 Frequency (Hz)

Explanation / Answer

The Impact Hammer test is one of the best experimental Modal analysis practices in vibration testing of machinery for fault diagnosis.

The Vibratin spectrum of test indicates, good input speed beacuse of low vibration amplitude. If you go for the maximum input speed it results high vibration amplitudes at particular natural frequency which coincides or nearly coincides to you system's frequency, which inturn gives severe damages due to high amplitudes.

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