This computational work investigates planetary gear load sharingof threemount suspension wind turbine gearboxes. A threedimensional multibody dynamic model is established, includinggravity, bending moments, fluctuating mesh stiffness, nonlineartooth contact, and bearing clearance. A flexible main shaft,planetary carrier, housing, and gear shafts are modeled usingreduced degreesoffreedom through modal compensation. This drivetrain model is validated against the experimental data of GearboxReliability Collaborative for gearbox internal loads. Planet loadsharing is a combined effect of gravity, bending moment, bearingclearance, and input torque. Influences of each of these parametersand their combined effects on the resulting planet load sharing areinvestigated. Bending moments and gravity induce fundamentalexcitations in the rotating carrier frame, which can increasegearbox internal loads and disturb load sharing. Clearance incarrier bearings reduces the bearing load carrying capacity andthus the bending moment from the rotor can be transmitted into gearmeshes. With bearing clearance, the bending moment can cause toothmicropitting and can induce planet bearing fatigue, leading toreduced gearbox life. Planet bearings are susceptible to skiddingat low input torque.
- Edition:
- 12
- Published:
- 10/01/2012
- Number of Pages:
- 16
- File Size:
- 1 file , 690 KB
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