(1) Nonlinear dynamic model of yaw-torsion coupling of involute spur gear drive
For involute spur fixed-shaft gear drive and planetary gear drive respectively, the meshing plane force system caused by uneven load distribution along the tooth width direction is analyzed, the influence of center distance change caused by geometric eccentricity, center distance deviation and transverse displacement on the direction of meshing force is analyzed, and the influence of meshing state change of tooth surface and back on the direction of meshing force action is analyzed, taking into account rotation.For the gyroscopic effect caused by the change of axle space orientation, a non-linear dynamic model of yaw-torsion coupling including the dynamic changes of gear meshing plane force system and meshing force direction is established by Lagrange method.
(2) Nonlinear dynamic engagement model of involute spur gear drive
For involute spur fixed shaft gear drive and planetary gear drive respectively, the influence of center distance change on tooth side clearance is analyzed, and the influence of tooth profile modification, speed change, center distance change and meshing state change of tooth surface and back on meshing rigidity is analyzed, and the meshing rigidity is calculated by analytical method.A non-linear dynamic engagement model including dynamic backlash and dynamic engagement stiffness, which can be applied to profile modified gears, is proposed to realize feedback calculation of the non-linear dynamic model coupled with the yaw-torsion yaw of gear drive.
(3) Vibration characteristic test research and model verification of involute spur gear drive system
The test and test platforms of shaft gear drive system and planetary gear drive system are established separately, and the test methods, test principles and data processing methods of relevant signals of vibration characteristics are studied, as well as the vibration characteristics test under several steady-state conditions are carried out.Dynamic modeling and numerical simulation are carried out for each test device. The simulation results are compared with the test results to verify the correctness of the involute spur gear drive yaw-torsion coupling non-linear dynamic model and non-linear dynamic engagement model.
(4) Research on Nonlinear Vibration Characteristics of Involute Spur Gear Drive System
For single-stage gear drive system, engine excitation is taken as input condition, and dynamic characteristics and parameter influence laws of gear drive system are analyzed under steady-state and no-load conditions respectively.Qualitative and quantitative analysis methods of non-linear dynamics are used to analyze the motion modes of gear transmission system under steady-state and no-load conditions.
(5) Research on tooth profile modification of involute spur gear drive system
The influence of tooth profile modification on meshing stiffness and load distribution coefficient between teeth is analyzed under quasi-static conditions.Based on the yaw-torsion coupling nonlinear dynamic model of gear transmission system, the influence of profile modification parameters on the dynamic characteristics is analyzed, and the influence of profile modification on the strength of gear teeth is further analyzed.To reduce the dynamic load of gear transmission system, an optimization model of tooth profile modification was established based on the nonlinear dynamic model of the yaw-torsion coupling of involute spur gear transmission system.
(6) Dynamic characteristics research and optimization design of gear drive system of tracked vehicle
Aiming at the gear drive system of tracked vehicle, the dynamic loads of each component under different gears are systematically analyzed, and the influence of gear machining accuracy and dynamic balance accuracy on the dynamic characteristics of each gear is compared and analyzed.Based on the non-linear dynamic model of gear transmission system of tracked vehicle, an optimization model considering multi-gear dynamic characteristics is established and optimized.
