Dynamic simulation of cylindrical roller bearings

  • Dynamische Simulation von Zylinderrollenlagern

Qian, Weihua; Jacobs, Georg (Thesis advisor)

Aachen : Publikationsserver der RWTH Aachen University (2014)
Dissertation / PhD Thesis

Aachen, Techn. Hochsch., Diss., 2013

Abstract

In this work, a three-dimensional dynamic simulation model for cylindrical roller bearings is developed based on multi-body-simulation software SIMPACK and programming language FORTRAN. The aim of this work is to build a universal program to calculate the dynamic behavior of cylindrical roller bearings. This simulation model integrates major part of the functionalities according to the state of the art of existing programs which are: the slice model, the mutual influences of neighboring slices, the basic three-dimensional model, the calculation of lubricant film thickness and damping forces, the radial clearance, the roller-pocket clearance, the centrifugal forces and the hysteresis damping forces. The extended functionalities in this work can be summarized as follows:1) Roller-pocket contact stiffness is taken into account and calculated with the help of finite element analysis. 2) The three types of cage guidance are modeled in details which are roller guidance, inner ring guidance and outer ring guidance.3) The geometry of cage pocket is modeled for contact detection.4) The elasticity of cage is built through importing the reduced finite element models.This extended model of cylindrical roller bearings is validated with the measurements and shows good agreement. Furthermore, for further plausibility of this model and also extension of the understanding of the dynamic behavior of cylindrical roller bearings such as roller slip, roller-pocket contact forces and cage mass center orbit, parameter variations in terms of different cage materials, cage guidance, radial clearances, roller-pocket clearances, are carried out. Lastly the bearing model is integrated in an existing multi-body-simulation model of a wind turbine namely in the main gearbox, in order to check the plausibility of this bearing model in wind turbines, based on the known behaviors of bearings. Through the further development of simulation model, the current established range of functions is extended. Thus the interpretation of bearings in engineering as well as the understanding of fundamental dynamic interactions during the design of cylindrical roller bearings is improved.

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