Study On Acoustic Radiation Analysis And Vibration Reduction Technology Of Quasi Double Curved Surface Cylindrical Secondary Gearbox

With the continuous improvement of modern industrialization,gear transmission is also developing towards the direction of high-speed,heavy load and low vibration and noise.The vibration and noise problems of mechanical equipment,including gearbox,are getting more and more attention.As a key part of mechanical equipment,the dynamic performance of gearbox directly affects the stability of mechanical equipment.Hypoid gear has high load-carrying capacity and excellent dynamic performance,which is easy to meet the requirements of high transmission ratio.At present,its application range is gradually developing from automobile field to other industrial fields.Therefore,the research on noise radiation characteristics and vibration reduction technology of hypoid gear industrial reducer has important theoretical significance and application value.The main research work of this paper is as follows:1)The multi-body dynamic model of the quasi double curved surface helical cylindrical gear transmission system is established in the multi-body dynamic analysis software ADAMS.The dynamic simulation analysis of the gear transmission system is carried out under the given working condition.The accuracy of the model is verified by comparing the speed obtained from the simulation with the theoretical value.At the same time,the dynamic force at the bearing seat is obtained,which provides the load excitation for the subsequent vibration analysis of the box.Finally,the influence of speed and load on the meshing impact of hypoid spiral bevel gear is studied.2)The finite element model of the box is established by using the finite element analysis software ABAQUS.The modal analysis of the box is carried out and the inherent characteristics of the box structure are obtained.On the basis of the modal analysis,the transient dynamic response of the box is analyzed,and the vibration response characteristics of the box under the given working condition are obtained,and the parts of the box with strong vibration are determined.At the same time,the harmonic response of the box is analyzed,and the vibration acceleration of the box node in the frequency domain is calculated.The frequency domain response of the box mainly occurs at the double frequency of the meshing frequency of hypoid gear.3)The boundary element model of the gearbox is established by using virtual lab acoustics software.Taking the acceleration of the node of the gearbox as the boundary condition,the noise radiation characteristics of the gearbox are simulated and analyzed.The sound pressure distribution of the gearbox is obtained,and the parts with strong vibration and noise are determined.According to the structural characteristics of the strong vibration parts,two vibration reduction schemes are proposed: the constrained damping treatment at the input end cover of the box;the reinforcement treatment at the output end cover of the box;the feasibility of the noise reduction scheme is verified through the comparative analysis of the noise radiation value before and after the improvement.4)The vibration test platform of the quasi double curved surface helical cylindrical gear reducer is built,and the vibration test and analysis of the box are carried out under the given working conditions.The experimental results are compared with the results of the dynamic response simulation of the gearbox.The reliability of the simulation results is verified.