Goodday all,

I am a new plant engineer and a novice to vibration analysis. I had a problem regarding vibration condition monitoring on a planetary gearbox. I hope someone out there could lend me a hand.

The problem Description:

1. Can anyone pls tell me the way to monitor vibration on a gearbox ? (Flender Planurex 435)

2. What are the important locations to place the vibration sensor ?

3. What are the setting required for the low pass to detect bearing fault and gear defect ?

4. How do we calculate the speed / defect frequency for sun gear, planet gear and the static ring gear ?

The machine parameter.

Input speed: 985 rpm
Output speed: 15.70 rpm

Bearings.
150 NU 2230 ECM
151 22326 CC/W33
550 24034 CC/W33
551 24036 CC/C3 W33
255 SL 1818/600
256 SL 1818/670
248 SL183044 C3
348 22326 CC/C3 W33

Gears.
100 Input shaft 985.00 30
502 Gear 441.04 67
500 Sun 441.04 26
341 Planet Gear 42
306 Internal ring gear Fixed 112
227 Sun 83.10 17
241 Planet gear 28
206 Internal ring gear Fixed 73

Regards,
Amberdog82

More viewable image.

See attachment for gearbox related frequencies.

John from PA

Flender_gearbox.pdf (4 Kb, 74 downloads)

Dear sir,

Can you share with me the formulaes for your gear frequencies calculation ?

I had done some on my own, but there is variance in the values compared to yours. Perhaps I have been making some mistakes somewhere.