Fornula-fitting method for predicting gear reducer noise radiation

The dynamic model of a cylindrical gear transmission system was built considering time-varying mesh stiffness,gear errors and bearing supporting. Dynamic load of the bearing was taken as an excitation,Vibration and noise radiation of a gear reducer were studied by using FEM / BEM. In case of no gear manufacturing errors,changes of radiated noise of the gear reducer versus rotation speed and load were calculated,respectively by using both numerical simulation and Kato's formulae,the results of both two methods agreed well. The influence of gear precision on the gear reducer noise was analyzed,then the relation between gear precision and the gear reducer noise was built. A gear reducer noise prediction formula was fitted in consideration of coupling effect between gear precision and operating conditions. The accuracy of the formula was validated with gear reducer noise measuring tests.