主动混合滑动轴承的可控性分析

针对动静压混合滑动轴承,分析了主动节流轴承的可控性,并提出以可控性系数来加以衡量。通过有限差分法迭代求解Reynolds方程,根据油腔内的流量平衡关系修正油腔压力,继而得到轴承间隙内的油膜压力分布和油膜合力;采用小扰动法求解得到轴承的8个动力特性系数和可控性系数。结果表明:增大油腔面积,将能有效提高轴承的可控性;油腔轴向宽度对轴承可控性系数的影响较大,而周向包角的影响相对较小;轴承的同心节流比对轴承的可控性有较大影响,提高节流比将能得到较好的可控性;油腔轴向宽度和轴承的同心节流比对轴承流量影响甚大,需要综合考虑轴承可控性和流量的关系,以达到最优性能。

Analysis of the Controllability of an Active Hybrid Sliding Bearing

The so-called controllability coefficients were proposed to analyze the controllability of an active hybrid sliding bearing.The Reynolds equation was numerically solved by using finite difference method and applying the flow continuity equations to all the recesses,and the oil pressure distribution between the bearing and journal was obtained.The dynamic coefficients and the controllability coefficients were computed by using finite disturbance method.Numerical results show that the controllability of the hybrid increases with the increment of the recesses area,and the axial width of the recesses has stronger influence on the controllability coefficients than the circumferential width does.The concentric pressure ratio has a significant influence on the controllability and a larger concentric pressure ratio will improve it.The axial width of the recesses and concentric pressure ratio also influence the fluid flow significantly,so both the controllability and fluid flow should be considered to optimize the hybrid bearing characteristics.