CAJ | 학술논문

建立了考虑润滑油粘热效应的滑动轴承热流体动力润滑分析模型,采用有限元法分析滑动轴承油膜压力和温度分布.对有限元方程关于扰动项求导直接得到油膜压力对于各扰动项的偏导数,并且通过油膜压力对于扰动项的偏导数构建油膜力Jacobi矩阵.采用Newton-Raphson方法确定给定静载下的轴承平衡位置,同时不需要额外的计算即可通过油膜力Jacobi矩阵获得滑动轴承动力特性系数.通过算例研究了轴承几何参数对滑动轴承动力系数的影响.分析结果表明,油膜温度对轴承刚度系数的影响大于阻尼系数；在轴承偏心率较小时,轴承承载力和刚度系数随转速的增加而增大；而在轴承偏心率较大时,轴承承载力和刚度系数随转速的增加而减小.
건립료고필윤활유점열효응적활동축승열류체동력윤활분석모형,채용유한원법분석활동축승유막압력화온도분포.대유한원방정관우우동항구도직접득도유막압력대우각우동항적편도수,병차통과유막압력대우우동항적편도수구건유막력Jacobi구진.채용Newton-Raphson방법학정급정정재하적축승평형위치,동시불수요액외적계산즉가통과유막력Jacobi구진획득활동축승동력특성계수.통과산례연구료축승궤하삼수대활동축승동력계수적영향.분석결과표명,유막온도대축승강도계수적영향대우조니계수；재축승편심솔교소시,축승승재력화강도계수수전속적증가이증대；이재축승편심솔교대시,축승승재력화강도계수수전속적증가이감소.
The finite element method (FEM) is introduced to calculate the oil film pressure and temperature distribution of a journal hearing.The perturbation is performed directly on the finite element equation.Consequently,the Jacobian matrices of the oil film forces are concisely obtained.The equilibrium position of the bearing with a given static load is found by the Newton-Raphson method.As byproducts,dynamic coefficients are obtained simultaneously without any extra computing time.From the numerical results,it is concluded that the effects of film temperature on stiffness coefficients are bigger than those on damping coefficients.With the increase of rotational speed,the load capacity and the stiffness coefficients of the journal bearing are increased when the eccentricity is small,while decreased when the eccentricity is big.