Vibro-acoustic Coupling Algorithm Of Bearing And Simulation Research On Vibration And Acoustic Features With Bearing Waviness

Rolling element bearings are essential parts of rotating machinery, and are widelyused in small and large industrial machines. Performances of such machines are greatlyinfluenced by the quality of bearing used in it. At the same time, the noise fromvibration will pollute the surrounding environment. With the development oftransmission towards high reliability and low-noise, it is more significant to study thevibration and noise behavior of bearing system.Although the processing and machining accuracy have been improved obviously, thesurface waviness also significantly affects the vibration and noise of rolling elementbearings. In this paper, a new and high computational algorithm of vibro-acousticcoupling was proposed, and the vibration and noise of bearing-housing system arepredicted. According to the new algorithm, the effect of Parameter variation of surfacewaviness on the vibration and noise of bearing-housing system was investigated, andsome valuable conclusions were obtained. The main contents of the paper are asfollows:①According to the Hertzian contact deformation theory and the kinematicsrelationship of bearings, the nonlinear contact load at the bearing area can be derived. Inthis paper, a6-DOF bearing dynamic model is established with the assumption of a littlemass rigid dielectric layer, which is located between the outer race of bearing and thefixed bearing housing;e②A displacement mapping method is proposed. Based on the6-DOF bearingdynamic model, the vibration responses of different components of bearing system aresolved. The displacement output of6-DOF bearing dynamic model is coupled with theexcitation input of the bearing housing finite element model using the mapping method.③The finite element model of bearing-housing system is established, and thevibration response of bearing housing under the excitation of perfect bearing is studied.The boundary element model of bearing housing is established, and the vibrationresponse of bearing housing is taken as the boundary condition. The acoustic parametersof bearing housing under the excitation of perfect bearing are studied.④According to the new algorithm of vibro-acoustic coupling, the effect of Parametervariation of surface waviness, i.e, the maximum amplitude and the wave number, on thevibration and noise of bearing-housing system was investigated. This provides a theoretical basis for the research of bearing design and manufacturing.The proposed new algorithm of vibro-acoustic coupling can be used to predict thevibration and acoustics of bearing-housing system. The new method is of highcomputational efficiency and time saving. The effect of Parameter variation of surfacewaviness on the vibration and noise of bearing-housing system was obtained, and itprovides a theoretical basis for the study of bearing design and manufacturing. Theresults show that this study has a certain academic significance and importantengineering applications.