| The study of the dynamic characteristics is significant to performance and reliability of gear systems.Although the gear dynamics is studied extensively,most researches are based on the gear module.In gear model,the contact is usually simplified and real contact between a pair of gears is neglected.Consequently,the calculation accuracy is reduced.However,tooth is the basic module of a gear pair.Studying dynamic characteristic with real contact of a tooth pair captured based on a tooth contact model accurately reflects the dynamics of the system.In this paper,the modeling method based on the tooth contact and dynamic response are investigated for a spur gear pair.A dynamic contact algorithm through distance detect is proposed.Using the algorithm with Herzian law,an involute dynamic tooth contact model is developed.The model includes some non-linear characters such as time-varying stiffness,damping,friction and backlash.Finally,a model integrating dynamic tooth contact and multi-teeth mesh algorithm is developed based on Adams Subroutine.The dynamic response and force are investigated for an external and internal gear pair.These characteristics are applied to validate the model preliminarily compared with theoretical result.On the other hand,the dynamic tooth root strain is calculated through the magnitude of contact force and position of meshing point.The dynamic response with different damping ratio and torque condition is also analyzed and selection of contact parameters is discussed.In order to validate the dynamic model,a strain-gauge-based method is proposed for measurement of dynamic tooth strain.A test rig considering the layout of sensors and data transmission is designed.Data acquisition equipment and Lab VIEW constitute the data acquisition system.The experimental testing was carried out under different working condition and data such as strain,torque and speed were acquired to assess simulation calculation.We can see that the magnitude and trend of dynamic strain verify the simulation calculation.The dynamic model is validated therefore. |
