Experimental assessment of gear meshing excitation propagation throughout multi megawatt gearboxes
Gearboxes consisting of both planetary and helical gear stages are increasingly used in helicopters, wind turbines and vehicles. A requirement for reliable gearbox design calculations is sufficient insight in internal gearbox dynamics. Excitation frequencies and excitation levels play an important role. Main objective of this work is to investigate the influence of internal gear meshing excitation on the overall gearbox dynamics. Experiments are conducted on a dynamic 13.2MW test facility on which two multi-megawatt wind turbine gearboxes are placed back to back. A dedicated dynamic load case representing realistic drive train excitation is applied and the role of the meshing orders in spreading this excitation over a broader frequency range is determined by means of waterfall spectra from measurement signals of bearing displacement sensors, torque sensors, encoders and accelerometers throughout the gearbox. Moreover the propagation of the meshing excitation throughout the gearbox is of interest. Relating the orders to the corresponding excitation source allows the definition of order influence regions within the gearbox. These insights will be used to prove the need for accurate gear mesh order excitation representation within the corresponding flexible multibody simulation model. Moreover the meshing order influence regions offer the opportunity to tune order excitation to the gearbox modal properties and reduce vibration levels.
KeywordsWind Turbine Helical Gear Gear Mesh Planet Carrier Wind Turbine Gearbox
Unable to display preview. Download preview PDF.
- 1.D. Qin,J.Wang,T.C. Lim, Flexible multibody dynamic modeling of a horizontal wind turbine drive train system, J. of Mechanical Design, 131(11)(2009) 114501-1 114501-8Google Scholar
- 2.J. Helsen,D. Vandepitte,W. Desmet, Flexible modelling of wind turbine gearboxes with special focus on shaft flexibilities, Proc. 10th International Conference on Recent Advanced in Structural Dynamics (RASD) 2010, SouthamptonGoogle Scholar
- 3.J. Helsen,F. Vanhollebeke, D. Vandepitte,W. Desmet, Optimized implementation of flexibility in wind turbine gearbox multibody model for model updating on dynamic test-rig, Proc. 1st joint International Conference on Multibody System Dynamics (IMSD) 2010, Lappeenranta FinlandGoogle Scholar
- 4.S.L.Harris, Dynamic loads on the teeth of spur gears, Institute of Mechanical Engineers 1954Google Scholar
- 6.J. D. Smith, Modelling the dynamics of misaligned helical gears with loss of contact, Institute of Mechanical Engineers 1998Google Scholar
- 8.D. Berckmans, Tools for the synthesis of traffic noise sources, PhD. dissertation Katholieke Universiteit Leuven, Department of Mechanical Engineering, Leuven, Belgium, 2010Google Scholar
- 9.J. Blough, A survey of DSP methods for rotating machinery analysis, what is needed, what is available? J. Sound Vib 262(3)(2003) 707720.Google Scholar
- 10.J. Blough, Improving the analysis of operating data on rotating automotive components, Ph.D. dissertation University of Cincinnati, Dept.of Mechanical, Industrial, and Nuclear Engineering, Cincinnati, USA, 1998Google Scholar
- 11.J. Blough, Development and analysis of time variant discrete fourier transform order tracking, Mechanical Systems and Signal Processing 17(6)(2003) 11851199Google Scholar