| The bearings are important components in the mechanical transmission systems,and often play a role in connection and load-bearing in the power transmission process.In addition to heavy loads and high rotation speeds,the bearings are also work in poor conditions,which are prone to failures such as plastic deformation,abrasion and fatigue spalling,resulting in failure to work properly.With the rapid development of the domestic industry and the continuous improvement of mechanical design and manufacturing technology,and the problems of insufficient bearing R&D design abilities and innovation capabilities have become increasingly obvious.Based on the structural characteristics of deep groove ball bearing in vehicle transmission,this paper combined CAD software and CAE technology,built a digital platform by MATLAB for bearing static and dynamic characteristics research.It realizes the parametric design and automatic simulation of the deep groove ball bearing,and it ensures the simulation accuracy and improves the design efficiency,which has important theoretical significance and engineering application value for improving the product quality and shortening development cycle.The main work of this paper is as follows:(1)Used theoretical methods to verify the accuracy of Ls-Dyna bearing static model.Built a bearing statics contact automatic digital platform by MATLAB,which combined CAD and CAE software.Made a static research about a transmission bearing by CAE technology with the platform,and proved that the ball which stay in the radial load direction has the largest contact force,and obtained the static contact characteristics like force,stress,pressure,etc.(2)Proposed the ADINA partial contact simulation method,and verified the accuracy of this method by compared with Hertz contact theory.Built an digital simulation platform for partial bearing static contact simulation based on ADINA.With this platform,built a micron-level model of bearing,and studied the characteristics in static contact and obtained the accuracy solutions of contact pressure,equivalent stress,shear stress between the ball and raceway.Through compared with theoretical calculation,.verified the accuracy of the model,and revealed the reason why the strength failure occurs first form the subsurface of the contact area.(3)Used theoretical and simulate calculation to analyse the internal bearing during rotation,and obtained the law of displacement,velocity,vibration,contact force,equivalent stress and contact pressure of the bearing,which verified the correctness of Ls-Dyna in dynamic simulation.Added dynamic analysis function to the platform to realize bearing dynamics modeling and calculation.Through the platform,studied the bearing dynamic characteristic under ideal and actual condition,which proved the reliability and practicality of the digital platform.(4)Based on stress data and dynamic characteristic,made a fatigue life analysis about the bearing by using MSC.Fatigue software,and added the fatigue function into the platform.Through the platform,studied the influence of load and channel curvature on bearing fatigue life,which proved the feasibility and efficiency of the digital platform. |
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