Research On Modeling Of Gear Pair Based On Multi-body Dynamics And Experiments

With the mechanical system dynamics analysis and simulation technology, the designers can geta comprehensive understanding of related features of the mechanical products and therefore make theglobal optimization. But the analysis accuracy is restricted because of the idealized modelingmethods for some mechanical elements. Based on the multibody dynamics theories, the two modelingapproaches of gear pairs are investigated in this thesis in order to get models which canreflect the actual meshing process to enhance the analysis accuracy of multibody dynamics inmechanical systems. The main contents of this thesis are arranged as follows：1. The modeling mechanism and the assumed conditions in application of the rigid toothmultibody models (RMB models) are researched.2. By using Ishikawa gears stiffness formulae, the rotary stiffness and contact stiffness ofRMB models are calculated. Then by fitting the data, the rotary stiffness calculationformula of RMB models is obtained.3. RMB package is developed based on ADAMS. Examples are given to compare the relatedmodels.4. The applied range of RMB models is explored through the example of a helical gear pair.5. The modeling mechanism of the elastic tooth multibody models (EMB models) isdiscussed. The approach of establishing the EMB models is introduced. An example isprovided to compare two types of the rigid-elastic models of gear pair.6. The gear impact test rig is established. The accuracy of the models in impact state isverified by use of the test rig.The research indicates that the two rigid-elastic models of gear pair better accord with themeshing characteristics in gear driving．Besides meeting the computation speed, the modelprovides a higher accuracy for the related multibody dynamics．...