Comparative Study Between Experimental and Theoretical Frictional Power Losses of a Geared System

Abstract

In this study, a frictional dynamic gear model is propounded for a lubricated FZG C40 spur gear pairs. The proposed nonlinear dynamic model accounts the actual time variable gear mesh stiffness with considering the frictional effects of meshing gear teeth. This developed model aims to predict with high accuracy the gear power losses and to highlight the influence of the friction coefficient. Two listed cases were considered through introducing a constant friction coefficient and a local coefficient of friction in the developed dynamic model. The influence of the constant and local coefficient of friction on the frictional spur gears power losses has been evaluated. All key parameters like axle gear oil dynamic and kinematic viscosity, contact conditions between meshing gear teeth through equivalent radius of curvature, slide-to-roll ratio, maximum Hertzian pressure and tooth profile deviations on which the local friction coefficient depends are introduced in the model formulation. The simulation results were obtained through solving the motion equations of the generalized translational torsional coupled dynamic system by an iterative implicit scheme of Newmark. The results of simulation were compared to experimental results investigated on an FZG test rig under several operating conditions of load and speed.