Abstract
The dynamic behaviour of a double-helical gear system supported by journal bearings is theoretically and experimentally investigated in this study. A bending–torsional–axial coupling model for dynamic analysis of double-helical gear system is developed. Influence of the time-varying mesh stiffness and damping is considered. Oil film stiffness and damping of the supporting journal bearing are supposed to be time-varying, and the time-varying oil film stiffness and damping are predicted by a back propagation neural network, which is optimized by genetic algorithm. A double-helical gear–rotor–journal bearing system test rig is also established to carry out the experimental investigations, such as the dynamic transmission errors of gear pairs. The comparisons between theoretical and experimental results show that the time-varying oil film dynamic coefficients of journal bearings are an important internal excitation. The theoretical model with time-varying oil film stiffness and damping can predict the gear dynamics more accurate than the model with time-invariant oil film stiffness and damping, and the neural network optimized by genetic algorithm can obtain the time-varying oil film stiffness and damping efficiently and accurately for the dynamic analysis of double-helical gear system.
Highlights
The double-helical (DH) gears have the advantages of high carrying capacity, smooth transmission and no axial load, while the fluid film journal bearings have the advantages of high stability and long lifespan
Theodossiades and Natsiavas[12] investigated response and stability characteristics of rotordynamic systems interconnected with gear pairs and supported on journal bearings, and the results indicated that the non-linearities are located at the journal bearings and the gear mesh only
With the measured data and geometric relation of gear pair, the dynamic transmission errors of gear pair can be calculated by the following equations f(ti, j) f(ti, jÀ1)
Summary
The double-helical (DH) gears have the advantages of high carrying capacity, smooth transmission and no axial load, while the fluid film journal bearings have the advantages of high stability and long lifespan. This article presents a theoretical and experimental study to investigate the dynamic behaviour of a DH gear system supported by journal bearings, and the influence of timevarying oil film stiffness and damping coefficients of journal bearings is included.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
