Dynamic behavior of spur gearbox with an elastic coupling under acyclism regime

Abstract

For many researchers and industrials the dynamic behavior of gearbox remains a paramount concern. In fact the diagnosis as well as the improvement of efficiency of gearbox is an ultimate goal for users such as machine builders, aeronautic and automotive manufacturers or energy producers. We should remind that the dynamic behavior of a gearbox depends on its design parameters and is also influenced by the engine operating conditions as well as the type of driving unit. A single stage spur gearbox is considered in this paper to investigate its dynamic behavior under acyclism regime. In fact the studied spur gear is powered by a four strokes four cylinders diesel engine using an elastic coupling modeled by Nelson and Crandell approach [7]. A numerical model is proposed taking into account the excitations induced by the motor torque fluctuation as well as the load variation and the fluctuation of meshing stiffness cased by acyclism regime. The implicit New-mark algorithm is used to investigate dynamic response of the studied system and the obtained results show the significant influence of both acyclism effect and elastic coupling on it.