Probability Analysis And Control Of Transmission Gear Whine

Gear whine noise is a periodic pure tone generated by gear stiffness excitation and error excitation during the process of transmitting torque.It is a steady-state noise generated by dynamic meshing force excitation.The error excitation includes the gear transmission system.In the process of manufacturing,installation and operation,there are random manufacturing and random assembly errors.In the process of gear design,designers generally use definite values and simplified design to determine the performance and macro parameters of the gear transmission system,and then specify the gear accuracy and its tolerance range according to the requirements of manufacturing capacity and cost control.Due to the lack of the statistical distribution law of gear manufacturing errors and the study of its influence on gear whine noise,the designed gears have a widespread problem of poor whine noise consistency after mass production.In this paper,the gear transmission error parameter model is established to study the influence of manufacturing error factors on the system transmission error,and combined with the transmission noise transfer function,the probability analysis of transmission whine noise is carried out.The transmission dynamics simulation analysis model is established,and the finite element method and modal test are used to verify the effectiveness of the transmission housing finite element.The transmission error of the transmission gear and the vibration response of the bearing are calculated.By combining direct boundary element theory and MATV technology,the noise transfer function(NTF)in all directions at the bearing of the transmission is calculated.Based on the gear inspection drawings,the gear profile error,helical error and single pitch error of the gear produced by a domestic gear manufacturer are counted and the distribution law of each manufacturing error is analyzed.The gear is analyzed through the measured data of the off-line inspection platform.The collinearity between errors and the mechanical model of transmission errors are combined to derive and synthesize each gear parameter along the gear meshing line.Establishing A 22-degree-of-freedom gear dynamic model,and the gear system was solved by the Runge-Kutta method,and the influence of gear errors on the whine noise of the transmission was studied.Based on the gear dynamics model,the influence of gear eccentricity on the whine noise of the transmission is analyzed.The influence of the parameters exceeding the tolerance range in the gear statistics process and the bimodal distribution parameters in the gear statistics process on the whine noise of the transmission is analyzed.The results show that the gear eccentricity will increase the vibration and noise of the transmission;out-of-tolerance parameters The existence of the transmission noise will increase the sound pressure level of the transmission noise and have an impact on the consistency of the noise;the bimodal parameters meet the given processing requirements,but will have a greater impact on the consistency of the transmission gear noise,making The consistency of transmission noise may not meet the qualification requirements.The results show that controlling the gear error within a certain range can control the consistency of transmission whine noise.Therefore,in the gear production process,not only the gear supplier needs to strictly control the gear error,but also needs to be integrated in the gear design process.The supplier’s processing capabilities are designed for gears.