具有压力高、流量大等优点的柱塞泵是工程机械的动力源和关键元件，开展其故障诊断技术的研究对于提高工程机械的安全性和可靠性、保障人民生命财产安全具有重要意义。现有柱塞泵故障诊断方法由于对其刚-柔-液耦合特性，尤其是故障状态下的刚-柔-液耦合特性缺乏深入分析，导致不能实现故障的定量评估。本项目立足于该研究现状和技术实际，拟开展基于刚-柔-液耦合特性分析的柱塞泵故障诊断方法研究。主要内容包括：分析柱塞泵的结构特点和流体特性，构建其刚-柔-液耦合动力学模型，包括多体动力学模型、有限元的柔性化模型、流体传动模型和摩擦副油膜动力学模型；分析柱塞泵复杂环境下的动力学特性，揭示不同类型故障的形成机理与发展趋势；分析柱塞泵故障状态下的刚-柔-液耦合动力学行为，研究不同类型、不同程度的故障与系统动态响应的对应关系，实现对其故障的定量分析。

Piston pump with high pressure and large flow is the power source and key component in construction machinery. In order to not only improve the safety and reliability of construction machinery, but also protect people's lives and property, it is important to carry out the research on fault diagnosis of piston pump. The existing fault diagnosis methods of piston pump can not achieve the quantitative analysis. In piston pump, the coupling of rigid-flexible-fluid is a basic feature. The aim of this project is to evaluate failure of piston pump quantitatively based on rigid-flexible-fluid coupling modeling and analysis. The main contents include: At first, the structural and fluid characteristics of piston pump will be studied. The rigid-flexible-fluid coupling model which includes multi-body dynamics model, flexibility model, fluid transmission model and oil film dynamic model will be established. Rigid-flexible-fluid coupling mechanism will be investigated. Then, the dynamic behavior of piston pump in the complex environment will be analyzed. The formation mechanism and developing trends of different types of failure will be revealed. At last, the relationship between fault and dynamic response will be investigated. The fault diagnosis model will be built. Through these work, we can evaluate failure of piston pump quantitatively.