Enhanced model of gear transmission dynamics for condition monitoring applications: Effects of torque, friction and bearing clearance. (15th February 2017)

• Record Type: Journal Article
• Authors: Fernandez-del-Rincon, A.; Garcia, P.; Diez-Ibarbia, A.; de-Juan, A.; Iglesias, M.; Viadero, F.
• Is Part Of: Mechanical systems and signal processing. Volume 85(2017)
• Page Start: 445
• Page End: 467
• Publication Date: 2017-02-15
• Subjects: Gear -- Model -- Transmission error -- Load ratio -- Meshing stiffness -- Finite element -- Bearings -- Condition monitoring; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2016.08.031
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: Gear transmissions remain as one of the most complex mechanical systems from the point of view of noise and vibration behavior. Research on gear modeling leading to the obtaining of models capable of accurately reproduce the dynamic behavior of real gear transmissions has spread out the last decades. Most of these models, although useful for design stages, often include simplifications that impede their application for condition monitoring purposes. Trying to filling this gap, the model presented in this paper allows us to simulate gear transmission dynamics including most of these features usually neglected by the state of the art models. This work presents a model capable of considering simultaneously the internal excitations due to the variable meshing stiffness (including the coupling among successive tooth pairs in contact, the non-linearity linked with the contacts between surfaces and the dissipative effects), and those excitations consequence of the bearing variable compliance (including clearances or pre-loads). The model can also simulate gear dynamics in a realistic torque dependent scenario. The proposed model combines a hybrid formulation for calculation of meshing forces with a non-linear variable compliance approach for bearings. Meshing forces are obtained by means of a double approach which combines numerical and analytical aspects. The methodology used provides a detailed description of the meshing forces, allowing their calculation even when gear center distance is modified due to shaft and bearing flexibilities, which are unavoidable in real transmissions. On the other hand, forces at bearing level were obtained considering a variable number of supporting rolling elements, depending on the applied load and clearances. Both formulations have been developed and applied to the simulation of the vibration of a sample transmission, focusing the attention on the transmitted load, friction meshing forces and bearing preloads. Abstract : Highlights: The paper presents an advanced gear dynamics model for application in condition monitoring. Gear and bearing non-linearities, variable meshing stiffness and bearing compliance are considered simultaneously. Different torque levels are considered, taking into account their impact on the dynamic behavior. Gear friction and bearing pre-loads and their interaction with gear dynamics have been analyzed.