中文摘要：

以低速大扭矩水压马达支承轴转子副为研究对象，在确定的水压马达初始参数下，基于力平衡方程及流量方程，建立了功率损失、静态和动态的数学模型；以总功率损失、承载能力、静刚度、转子径向速度和位移等作为支承轴转子副的性能指标，分析了水膜厚度对支承轴转子副性能的影响。研究表明：增大水膜厚度，支承轴的功率损失增加，转子的静刚度降低，水压马达的容积效率降低，转子的径向速度和位移增加，但承载能力不受其影响。因此，减小水膜厚度，可提高水压马达的容积效率和支承轴转子副的静、动态性能。

英文摘要：

The aim of this paper was to find an appropriate water film thickness to improve the volumetric efficiency of water hydraulic motor and the static and dynamic characteristics of the supporting shaft rotor pair. Based on the equilibrium equation and the flow equation, the mathematical models of the power loss, the static characteristics and the dynamic characteristics were established. The total power loss, the bearing capacity, the static stiffness, the radial velocity and the displacement of rotor could he the performance indexes of the supporting shaft rotor pair. Different size of the water film thickness had different performance indexes. So the influence of the water film thickness on the supporting shaft rotor pair was analyzed in detail. The research showed that when the water film thickness was increased, the power loss, the radial velocity and the displacement of rotor were increased, the static stiffness and the volumetric efficiency were reduced, but the bearing capacity kept constant.