Taking gear without tooth face invalidation such as agglutination and abrasion as a precondition , and according to the relation between minimal oil film thickness and tooth face roughness of elastic liquid dynamic pressure lubrication theory , viscosity of gear lubrication oil was educed by reliability method in this paper , and the calculation formula has been elicited and applied 摘要以齿轮传动不发生胶合、磨损等齿面失效为前提，根据弹性流体动压润滑理论的最小油膜厚度与齿面粗糙度的关系，用可靠性方法确定齿轮润滑油的粘度，给出计算公式并进行了实例计算。
For simplicity , these assumptions are followed in the simulation : 1 ) the coronary artery is modeled as rigid tube with constant cross section ; 2 ) the blood is assumed as viscous incompressible newtonian fluid without weight ; 3 ) the blood flow is developing laminar and becomes fully developed at far downstream 实际生理条件下，血液是粘弹性流体，但据文献表明，只要血管直径不太小，血液粘弹性对流动的影响不大，可以忽略不记，本文也吸收了这一结论以简化非关键过程，以提高工作效率。
