Practical Uses Of Advanced Rotordynamics Tools To Ensure Trouble-Free Operation Of A Gearbox.
The intent of this case study is to illustrate how rotor dynamics analysis can become an effective tool to improve rotor stability. Analytical method, such as undamped planar critical speed map is used to evaluate the vibration characteristics of a gearbox. Currently, advanced rotor dynamics software provides greater capability in generating and analyzing rotor models. By removing undesirable instability sources and ensuring reliable separation margin, successful rotor-stability improvement is validated. This case illustrates a rotor dynamics analysis applied on a high speed pinion of a speed increasing gearbox, which was exhibiting high vibration during operation. Analytical results predicted rotor instability due to the coincidence of the seven times operating speed and its fourth natural planar frequency. Based on recent investigation, this phenomenon is inherent to gear design, and can be controlled by adding or removing weight on the non-drive end of the high speed pinion without major modifications on the gearbox. Thanks to the rotor dynamics analysis model, the cause of the vibration was found and the gearbox redesigned, avoiding expensive down time to the users.
Marin, Manuel (2009). Practical Uses Of Advanced Rotordynamics Tools To Ensure Trouble-Free Operation Of A Gearbox.. Texas A&M University. Turbomachinery Laboratories. Available electronically from