重载斜盘泵滑靴副剧烈磨损阶段动力学特性及状态评估研究

The slipper pair is the key friction pair to the overloaded swash plate pump, which is easy to be in violent wear stage affected by bad working environments, thus is easier to have dynamics mechanism changes in normal working conditions due to wear failure. In order to solve unusual equipment station and accurate slipper pair wear failure assessment, we must explore new dynamics theory. The project will take some factors into consideration comprehensively such as lubricating property, thermal effect, coupling relationship between tribological characteristics and dynamic behaviors and propose friction dynamics system model firstly; Combined with actual working condition, the wear failure mechanism has been put forward based on numerical analysis method, which reveals the influence law of operating parameters and structure parameters on dynamic system; According to fault simulation experiments with dynamics model and changed working condition, sensitive characteristics have been attained and sensitive characteristics set of slipper pair with different attrition rate also been achieved by information fusion methods; And, the introduction of knowledge engineering and set pair analysis method for construction of status assessment system of tribology is the premise to ensure the hierarchical evaluation of wear-out failure on slipper pair. Studies of the project are expected to enrich and perfect theoretical system of hydraulic fault diagnosis; to expose the law of fault development for swash plate pump; and to contribute to provide substantial rationale for improving accuracy of fault diagnosis and health status assessment.

滑靴副是重载斜盘泵的关键摩擦副，受恶劣工况的影响极易进入剧烈磨损阶段，而产生磨损失效故障，使正常工况下的动力学机理发生改变。为及早发现设备异常，准确评估滑靴副磨损失效的早期故障状态，必须探索新的动力学理论。本项目将全面考虑弹流润滑特性、热效应以及摩擦学特性与动力学行为的耦合关系，建立摩擦动力学系统模型；结合实际工况，采用数值分析方法考察运行参数和结构参数变化对动力学系统的影响规律，揭示磨损失效发展机理；从动力学模型和变工况条件下的故障模拟实验中获取敏感特征信息，通过信息融合方法构建描述滑靴副不同磨损程度的敏感特征集；引入知识工程的思想，采用集对分析方法构建摩擦学系统的状态评估体系，实现对滑靴副磨损失效等级的评估。本项目的研究成果可以丰富和完善液压系统故障诊断的理论体系，揭示斜盘泵故障状态的发展规律，为提高斜盘泵故障诊断和健康状态评估的准确性提供坚实的理论基础。

滑靴副磨损是重载斜盘泵最易发生的故障形式，对其发展进程中故障动力学机理的研究对于及早发现设备异常，准确评估液压泵早期故障状态具有重要意义，为此，本项目对滑靴副剧烈磨损阶段的动力学发展机理进行了深入研究。首先，我们研究了滑靴副剧烈磨损过程的润滑特性方程和动力学方程的建模方法，考虑了工况参数以及磨损参数变化对润滑特性和动力学特性的影响规律，获得了一系列研究成果；利用上述理论研究成果，结合实际工况，采用数值分析方法考察了运行参数和结构参数变化对动力学系统的影响规律，揭示了滑靴副磨损失效的发展机理，验证了理论模型的正确性。从动力学模型和变工况条件下的故障模拟实验中探索出了多种敏感特征信息提取方法，并通过信息融合方法构建出了描述滑靴副不同磨损程度的敏感知识信息特征集；通过引入知识工程的思想，对滑靴副磨损失效等级进行了划分，并构建出了滑靴副剧烈磨损状态评估体系。可将本项目取得的成果应用于其他摩擦副的磨损故障发展机理研究中，为液压泵建立健全的故障机理知识体系奠定理论基础。