【作者】 张伟；

【导师】 吴凤和； 王振宇；

【作者基本信息】 燕山大学 ， 工程硕士（专业学位）， 2021， 硕士

【摘要】 液压泵是液压系统的核心动力元件,在机械行业内是不可或缺的元器件,其一旦发生故障将会造成整个液压系统的瘫痪。开展液压泵剩余寿命预测研究,对其劣化规律进行判断并预测,实现预测性维护意义重大。本文针对不易停机的大型液压泵及相关设备的预测性维护难题,基于概率统计分析理论提出液压泵剩余寿命预测新方法,开展基于实测数据概率分析方法对液压泵的剩余寿命预测进行了研究,论文的主要工作如下:(1)分析了国内外剩余寿命预测方法的研究现状及液压泵的剩余寿命预测研究现状,研究了液压泵的寿命影响因素并对其进行了失效分析。介绍了本文研究内容需要用到的基本概念,并确定了液压泵的失效判据。设计并搭建了液压泵耐久性试验台用以模拟液压泵的实际工况,提出了试验方案,为后续的工作提供了试验基础。(2)结合试验台实测退化数据及所确定的失效参考值,挖掘容积效率随时间变化的退化规律,同时利用残差分析减少异常数据导致的误差;基于概率统计分析理论,建立基于实测退化数据的可靠概率服役寿命预估模型;筛选出最佳分布模型,获取退化数据与其服役寿命的映射关系;制定了预测结果的验证方案,验证了本方法的准确性。(3)利用MATLAB并基于本文提出的预测方法设计并开发了液压泵剩余寿命预测原型系统,实现了液压泵的剩余使用寿命在线自动预测,便于人机交互。更多还原

【Abstract】 Hydraulic pump is the core power component of the hydraulic system,which is indispensable in the mechanical industry.Once it breaks down,it will cause the paralysis of the whole hydraulic system.It is of great significance to carry out the prediction research on the remaining life of hydraulic pump,judge and predict its deterioration law,and realize predictive maintenance.Aiming at the predictive maintenance problems of large hydraulic pumps and related equipment that are not easy to shut down,this paper proposes a new method for predicting the remaining life of hydraulic pumps based on probability and statistics analysis theory,and carrying out a research on the remaining life prediction of hydraulic pumps based on the probability analysis method of measured data.The main work is as follows.(1)The current research status of domestic and foreign remaining life prediction methods and the remaining life prediction research status of hydraulic pumps are analyzed,and the factors affecting the life of hydraulic pumps are studied and failure analysis is carried out.The basic concepts that need to be used in the research content of this article are introduced,and the failure criterion of the hydraulic pump is determined.The hydraulic pump durability test bench was designed and built to simulate the actual working conditions of the hydraulic pump,and the test plan was proposed,which provided the test basis for the follow-up work.(2)Combining the measured degradation data of the test bed and the determined failure threshold,mine the degradation law of volumetric efficiency over time,and use residual analysis to reduce errors caused by abnormal data.Based on the probability and statistics analysis theory,establish a reliable probability based on the measured degradation data Service life prediction model;Screen out the best distribution model,obtain the mapping relationship between degradation data and service life;Develop a verification plan for the prediction results,verify the accuracy of this method.(3)Using MATLAB and based on the prediction method proposed in this paper,a prototype system for predicting the remaining life of a hydraulic pump is designed and developed,which realizes the online automatic prediction of the remaining life of the hydraulic pump,which is convenient for human-computer interaction.更多还原