Research On Vibration And Noise Control Methouds Of Spur Gear Shafting

The spur gear transmission system is widely used in mechanical equipment such as vehicles,wind power generation,and ships.During operation,the system is subjected to both internal and external excitations,resulting in vibration throughout the system.The dynamic meshing force generated during gear engagement not only excites the gear body but also transmits through the shaft to the bearing,then to the gearbox body and surrounding structures,causing vibration and noise radiation.Therefore,how to effectively reduce or attenuate the radiation noise of the gear pair,gearbox,and transmission noise and achieve the design of high-stability,long-life,and high-performance gear transmission system has become a key research point in gear transmission system.This paper aims to reduce the vibration and noise of the spur gear transmission system,analyze the causes of gear pair vibration under different working conditions,and propose targeted vibration reduction and noise reduction methods.The main work includes:(1)establishing a nonlinear dynamic model of spur cylindrical gears considering time-varying tooth clearance,time-varying friction coefficient,and error excitation,exploring the influence of different factors on the vibration characteristics of spur cylindrical gear pairs.(2)Establishing a sound-solid coupling model of the gearbox casing based on the finite boundary method,combined with a nonlinear gear support spur cylindrical gear dynamic model to evaluate the effects of support damping coefficient on gearbox casing radiation and conduction noise.(3)Using the finite element method and finite volume method to calculate and evaluate the stiffness and damping coefficients of the Integral Squeeze Film Damper(ISFD),and incorporating the calculation results into the established nonlinear spur cylindrical gear dynamic model to verify the vibration reduction characteristics of the ISFD.Subsequently,establishing a vibration reduction and noise reduction test bench for spur cylindrical gear shaft systems with center distance errors to verify the broadband vibration reduction and noise reduction characteristics of the ISFD.Finally,using finite element software and life evaluation software n Code to evaluate the life of traditional rigid support and ISFD-supported gears,exploring the influence of ISFD on gear pair life.(4)Building a spur cylindrical gear shaft system test bench,comparing the effects of different types and thicknesses of viscoelastic damping materials on gear shaft system noise,and verifying the noise reduction performance of viscoelastic damping materials.(5)Based on the single-input and multiple-output modal test method,conducting impact hammer tests on the modal of the gearbox casing,and using experimental results to modify the finite element modal analysis results.After effectively ensuring the accuracy of the finite element method in calculating modal results,this method is used for lightweight and low-noise design of the gearbox,exploring lightweight and low-noise design technologies.