北京航空航天大学学报
北京航空航天大學學報
북경항공항천대학학보
2001年
1期
93-96
,共4页
铁磁流体%润滑%非牛顿流体%平板滑块
鐵磁流體%潤滑%非牛頓流體%平闆滑塊
철자류체%윤활%비우돈류체%평판활괴
计算结果表明，铁磁流体润滑的平板滑块的性能与牛顿流体或Bingham塑料润滑的平板的性能显著不同.屈服应力引起粘附核的发生，并且增加滑块的承载能力.在低速润滑中，高磁场强度对承载能力是有好处的，因为它可以提高铁磁流体的粘度和在润滑膜中引起粘附核.当出现粘附核时，铁磁流体润滑的平板滑块的最佳膜厚比的值大于2.2，并随外磁场强度增加而增大.在高速润滑中，可能没有粘附核出现，在此情况下，为了得到最大承载能力而采用膜厚比的值为2.2是可取的.在高磁场强度或高剪切速率下，铁磁流体润滑的平板滑块的摩擦系数增大.
計算結果錶明，鐵磁流體潤滑的平闆滑塊的性能與牛頓流體或Bingham塑料潤滑的平闆的性能顯著不同.屈服應力引起粘附覈的髮生，併且增加滑塊的承載能力.在低速潤滑中，高磁場彊度對承載能力是有好處的，因為它可以提高鐵磁流體的粘度和在潤滑膜中引起粘附覈.噹齣現粘附覈時，鐵磁流體潤滑的平闆滑塊的最佳膜厚比的值大于2.2，併隨外磁場彊度增加而增大.在高速潤滑中，可能沒有粘附覈齣現，在此情況下，為瞭得到最大承載能力而採用膜厚比的值為2.2是可取的.在高磁場彊度或高剪切速率下，鐵磁流體潤滑的平闆滑塊的摩抆繫數增大.
계산결과표명，철자류체윤활적평판활괴적성능여우돈류체혹Bingham소료윤활적평판적성능현저불동.굴복응력인기점부핵적발생，병차증가활괴적승재능력.재저속윤활중，고자장강도대승재능력시유호처적，인위타가이제고철자류체적점도화재윤활막중인기점부핵.당출현점부핵시，철자류체윤활적평판활괴적최가막후비적치대우2.2，병수외자장강도증가이증대.재고속윤활중，가능몰유점부핵출현，재차정황하，위료득도최대승재능력이채용막후비적치위2.2시가취적.재고자장강도혹고전절속솔하，철자류체윤활적평판활괴적마찰계수증대.
The calculated results show that the performance of the ferrofluid-lubricated plane sliders is different obviously from the performance of plane sliders lubricated with Newtonian fluid or Bingham plastic. The yield stress causes the attached cores and increases the load carrying capacity of plane slider. In the case of a low velocity lubrication, the high applied magnetic field strength is of benefit to the load carrying capacity, since it can increase viscosity of a ferrofluid and can cause the attached cores in the lubricating film. When the adhered cores occur, the magnitude of optimum film thickness ratio of a plane slider lubricated with ferrofluid is much larger than 2.2 and increases with increasing applied magnetic field strength. In the case of a high speed lubrication, it is possible that no adhered cores appear and the film thickness ratio of 2.2 is advisable to reach a maximum load carrying capacity. The friction coefficient of a ferrofluid-lubricated plane slider is larger under the condition of a high magnetic field strength and a high shear rate.
