北京工业大学学报
北京工業大學學報
북경공업대학학보
JOURNAL OF BEIJING POLYTECHNIC UNIVERSITY
2015年
2期
182-187
,共6页
陈东菊%边艳华%范晋伟%周帅
陳東菊%邊豔華%範晉偉%週帥
진동국%변염화%범진위%주수
液体静压轴承%速度滑移%微流动%轴承性能%敏感度
液體靜壓軸承%速度滑移%微流動%軸承性能%敏感度
액체정압축승%속도활이%미류동%축승성능%민감도
hydrostatic bearing%velocity slip%micro-flow%bearing performance%sensitivity
为了使液体静压轴承油膜性能的研究更加准确,基于计算流体力学( computational fluid dynamics,CFD)和有限差分方法,研究了液体静压轴承间隙油膜微流动的速度滑移现象及其对轴承性能的影响,并定义敏感度物理量对影响程度进行评估。在传统油膜流动假设条件基础上,引入Navier速度滑移边界条件对传统的Reynolds方程进行修正,通过有限元差分方法求解修正后的Reynolds方程,采用梯形积分公式求解轴承承载力等性能参数,对速度滑移影响的轴承性能的敏感度做出定量和定性分析。研究结果表明：油膜压力分布、轴承的承载力、动刚度及油腔流量等轴承性能对速度滑移都有一定的敏感性。最大油腔压力随滑移系数的增加而减小；速度滑移在一定程度上提高了轴承承载能力和油腔流量,但同时降低了轴承动刚度,流量对速度滑移的敏感度最大达到100%。
為瞭使液體靜壓軸承油膜性能的研究更加準確,基于計算流體力學( computational fluid dynamics,CFD)和有限差分方法,研究瞭液體靜壓軸承間隙油膜微流動的速度滑移現象及其對軸承性能的影響,併定義敏感度物理量對影響程度進行評估。在傳統油膜流動假設條件基礎上,引入Navier速度滑移邊界條件對傳統的Reynolds方程進行脩正,通過有限元差分方法求解脩正後的Reynolds方程,採用梯形積分公式求解軸承承載力等性能參數,對速度滑移影響的軸承性能的敏感度做齣定量和定性分析。研究結果錶明：油膜壓力分佈、軸承的承載力、動剛度及油腔流量等軸承性能對速度滑移都有一定的敏感性。最大油腔壓力隨滑移繫數的增加而減小；速度滑移在一定程度上提高瞭軸承承載能力和油腔流量,但同時降低瞭軸承動剛度,流量對速度滑移的敏感度最大達到100%。
위료사액체정압축승유막성능적연구경가준학,기우계산류체역학( computational fluid dynamics,CFD)화유한차분방법,연구료액체정압축승간극유막미류동적속도활이현상급기대축승성능적영향,병정의민감도물리량대영향정도진행평고。재전통유막류동가설조건기출상,인입Navier속도활이변계조건대전통적Reynolds방정진행수정,통과유한원차분방법구해수정후적Reynolds방정,채용제형적분공식구해축승승재력등성능삼수,대속도활이영향적축승성능적민감도주출정량화정성분석。연구결과표명：유막압력분포、축승적승재력、동강도급유강류량등축승성능대속도활이도유일정적민감성。최대유강압력수활이계수적증가이감소；속도활이재일정정도상제고료축승승재능력화유강류량,단동시강저료축승동강도,류량대속도활이적민감도최대체도100%。
To accurately research the hydrostatic bearing oil film performance,based on the computational fluid dynamics ( CFD) and finite difference method, velocity slip phenomenon of the oil film micro-flow in hydrostatic bearing clearance and its influence on bearing performance are investigated. The sensitivity parameters are defined to evaluate the impact of velocity slip on the bearing performance. Based on the conventional assumptions of the oil film flow, the conventional Reynolds equation is modified by introducing Navier-slip boundary condition. Modified Reynolds equation is solved by finite difference method, and the performance parameters such as bearing capacity are deduced using the method of trapezoidal integral formula. The parameters of sensitivity are used to make a quantitative and qualitative analysis. Results show that bearing performances such as the distribution of oil film pressure, bearing capacity, dynamic stiffness and oil cavity flow have a certain sensitivity for velocity slip. The maximum cavity pressure decreases with the increase of slip length, to a certain extent, the load capacity and oil flow of the bearing are improved;however, the dynamic stiffness of the hydrostatic bearing is reduced at the same time. The maximum sensitivity of quality flow to velocity slip is 100%.
