1 Putting forword the question and its calculating method The lubrication of involute spur gear transmission is the typical one of transient EHL line contact problem. It can't be described only with famous Dowson-...1 Putting forword the question and its calculating method The lubrication of involute spur gear transmission is the typical one of transient EHL line contact problem. It can't be described only with famous Dowson-Higginson equation, but it is a very complicated partial difference equation. So far, no any complete discussion has been seen at home and abroad, and it is a forward problem at this field in internation. So there is a number of deepgoing and much-needed work to do. It is correspondence with practical lubrication condition to explore the展开更多
This paper presents an investigation into the effect of surface asperities on the over-rolling of bearing surfaces in transient elastohydrodynamic lubrication(EHL) line contact. The governing equations are discretized...This paper presents an investigation into the effect of surface asperities on the over-rolling of bearing surfaces in transient elastohydrodynamic lubrication(EHL) line contact. The governing equations are discretized by the finite difference method. The resulting nonlinear system of algebraic equations is solved by the Jacobian-free Newtongeneralized minimal residual(GMRES) from the Krylov subspace method(KSM). The acceleration of the GMRES iteration is accomplished by a wavelet-based preconditioner.The profiles of the lubricant pressure and film thickness are obtained at each time step when the indented surface moves through the contact region. The prediction of pressure as a function of time provides an insight into the understanding of fatigue life of bearings.The analysis confirms the need for the time-dependent approach of EHL problems with surface asperities. This method requires less storage and yields an accurate solution with much coarser grids. It is stable, efficient, allows a larger time step, and covers a wide range of parameters of interest.展开更多
文摘1 Putting forword the question and its calculating method The lubrication of involute spur gear transmission is the typical one of transient EHL line contact problem. It can't be described only with famous Dowson-Higginson equation, but it is a very complicated partial difference equation. So far, no any complete discussion has been seen at home and abroad, and it is a forward problem at this field in internation. So there is a number of deepgoing and much-needed work to do. It is correspondence with practical lubrication condition to explore the
基金financial support from the Indian National Science Academy,New Delhi,IndiaBiluru Gurubasava Mahaswamiji Institute of Technology for the encouragement and support。
文摘This paper presents an investigation into the effect of surface asperities on the over-rolling of bearing surfaces in transient elastohydrodynamic lubrication(EHL) line contact. The governing equations are discretized by the finite difference method. The resulting nonlinear system of algebraic equations is solved by the Jacobian-free Newtongeneralized minimal residual(GMRES) from the Krylov subspace method(KSM). The acceleration of the GMRES iteration is accomplished by a wavelet-based preconditioner.The profiles of the lubricant pressure and film thickness are obtained at each time step when the indented surface moves through the contact region. The prediction of pressure as a function of time provides an insight into the understanding of fatigue life of bearings.The analysis confirms the need for the time-dependent approach of EHL problems with surface asperities. This method requires less storage and yields an accurate solution with much coarser grids. It is stable, efficient, allows a larger time step, and covers a wide range of parameters of interest.
