Investigation on the Effect of Mesh Phasing on the Vibration Response of a Damaged Planetary Gear Transmission

Abstract

For any mechanism, and in the case of planetary gear (PG), the vibration response always has a good concept that can give information about the system in any case. It allows to clarify properly the crack defect characteristics of PG train. In fact, a lumped-parameter-model of PG system is used to study the impact of the internal excitations due to the cracked sun. In this model, Mesh Stiffness Function (MSF) with crack damage are computed using an analytical approach and then they are adopted to drive the model. In addition, the effect of geometry and design parameters are highlighted through the study of the mesh phasing effect in the presence of failure crack. Three kinds of PG trains, namely In-Phase (IP), Sequentially Phased (SQ) and Counter-Phased (CP) gear meshes are discussed in simulation analyses. The obtained results shows the validity and the ability of the developed dynamic model to solve the problem related to the complex structure. It shows also the importance of such computationally techniques that are more efficient predictive models for the design purposes of PG.