Research On Multi-Body Dynamtic And Modification Design Of Thermo-Elastic Coupled High Speed Gear Transmission System

As an important power transmission device in mechanical system,gear system has the advantages of high transmission efficiency,accurate transmission ratio,compact structure and long service life.Therefore,it is widely used in the fields of aerospace,automobiles,ships,wind power,national defense and military industry.With the development of industrial technology,the higher performance and characteristics of the gear transmission system are needed.In the actual transmission process,the gear system suffers heavy vibration and nosie due to the influnences of thermal and elastic deformation of the case,the bearing and the shaft as well as the error of the manufacture and the installation,which seriously affects its transmission performance and can’t meet its development requirements.Gear modification is currently an effective means to reduce vibration and noise.Therefore,taking the high-speed involute helical gear transmission system as the research object,this paper studies multi-body dynamtic and modification design of thermo-elastic coupled high speed gear transmission system.The main research contents of this paper include:(1)The background and significance of the paper are introduced.Moreover,analyzing a large number of relative works at home and abroad.Further,the research ideas and main contents of this paper are determined.(2)A nonlinear multi-body dynamic numerical analysis method for thermoelastic coupling involute helical gear transmission system is proposed.Firstly helical gear transmission systemis established by means of the lumped mass method.Then,with the consideration of thermal deformation,time-varying meshing stiffness,meshing damping,tooth surface friction,eccentricity,tooth side clearance,modification and nonlinear bearing forces,the equation of the system is established by using Lagrange equation.Next,the 4-5 order Runger-Kutta method is used to solve the above differential equations.Further,the influences of the thermal deformation,eccentricity and modification on for the gear transmission system are investigated.(3)The multi-body dynamics simulation analysis method of the involute helical gear transmission system based on ANSYS and ADAMS is proposed.Firstly the parametric modeling and its flexibility of the involute helical gear transmission system is carried out using ANSYS.Secondly,the simulation of involute helical gear transmission system is carried out by Adams.Based on it,the simulation results are compared with the above numerical analysis results to verify thecorrectness and effectiveness of the method proposed in Chapter 2.(4)An optimization design method of involute helical gear transmission system based on improved artificial bee colony algorithm is proposed.Firstly,mathematical model of the modification optimization of the involute helical gear transmission system is established,taking the peak-to-peak value of the minimum dynamic transmission error as the optimization target,the modification amount,modification length and modification indexas as the variables.Then,an improved artificial bee colony algorithm is proposed and used to obtain the optimal modification parameters.Finally,to verify the correctness and effectiveness of the method proposed in this chapter,the vibration responses under the unmodification,empirical modification and optimized modification are compared.