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基于AMESim液压系统泄漏仿真与故障诊断研究

发布时间:2018-02-16 03:55

  本文关键词: 工程装备 液压系统 泄漏仿真 故障诊断 AMESim 支持向量机 出处:《国防科学技术大学》2012年硕士论文 论文类型:学位论文


【摘要】:工程装备是我军武器装备的重要组成部分,主要用以军队遂行工程保障任务,其工作稳定性、战场生存能力将直接关系到战斗工程保障任务的顺利完成乃至战争的成败。液压传动广泛应用于我军现役工程装备的动力传递中,而液压泄漏一直是工程装备技术保障的难题之一。开展液压系统泄漏故障诊断和防泄漏技术研究,探寻有效降低工程装备液压泄漏故障的途径和方法,对提高工程装备保障能力具有重要的理论指导意义和军事应用价值。 本文针对液压系统泄漏故障诊断手段单一、故障样本难以获取等问题,以典型工程装备某重型机械化桥为研究对象,采用面向对象建模仿真和支持向量机故障诊断方法,对其工作装置液压系统进行了建模仿真和液压泄漏故障诊断,,有效提高了小样本事件故障诊断的准确率,为液压系统泄漏故障诊断提供了一种新的智能诊断方法。论文主要研究工作及成果如下: (1)系统概括了液压系统泄漏故障诊断的研究现状,对引起泄漏的原因和泄漏故障机理进行了详细分析,将外泄漏和内泄漏分别等效为孔口出流和缝隙流动,分析得到油液黏度和缝隙高度等因素对泄漏量有较大影响,提出了液压泄漏故障诊断策略。 (2)根据上述制定的泄漏故障诊断策略,运用液压机械系统建模仿真软件AMESim建立了某重型机械化桥首跨架设液压系统工作回路模型,引入顶推液压缸工作回路泄漏和锁紧液压缸内泄漏等泄漏故障进行仿真分析,得到不同泄漏情况下的故障特征,为泄漏故障诊断和预防提供了理论依据。 (3)从泄漏故障仿真中提取压力、流量等特征参数,导入Matlab求取时域特征值,作为支持向量机进行泄漏故障诊断的数据样本,运用SVM模式识别软件包LibSVM训练所得模型准确诊断出了泄漏故障发生的部位和引起泄漏的原因,从而验证了本文将泄漏故障建模仿真与支持向量机故障诊断相结合的方法的可行性和有效性。 (4)从控制液压油黏度、控制液压系统缝隙高度和液压管路的正确装配等环节对如何做好液压系统防泄漏工作进行了分析研究,提出了预防泄漏故障的对策和方法。
[Abstract]:Engineering equipment is an important part of our army's weapons and equipment. It is mainly used for the military to carry out engineering support tasks and its work stability. Battlefield survivability will be directly related to the successful completion of combat engineering support tasks and even the success or failure of war. Hydraulic transmission is widely used in the power transmission of our active engineering equipment. Hydraulic leakage has always been one of the difficult problems in the technical support of engineering equipment. The research on hydraulic system leakage fault diagnosis and leakage prevention technology is carried out to explore the ways and methods to effectively reduce the hydraulic leakage failure of engineering equipment. It has important theoretical guiding significance and military application value to improve the engineering equipment support ability. Aiming at the problems of single method of hydraulic system leakage fault diagnosis and difficulty in obtaining fault samples, this paper takes a heavy mechanized bridge of typical engineering equipment as research object, adopts object-oriented modeling and simulation and support vector machine fault diagnosis method. The hydraulic system of its working device is modeled and simulated and the fault diagnosis of hydraulic leakage is carried out, which effectively improves the accuracy of fault diagnosis for small sample events. This paper provides a new intelligent diagnosis method for hydraulic system leakage fault diagnosis. The main research work and results are as follows:. 1) the present situation of hydraulic system leakage fault diagnosis is summarized. The causes of leakage and the mechanism of leakage fault are analyzed in detail. The external leakage and internal leakage are equivalent to orifice outlet flow and slot flow, respectively. Based on the analysis of oil viscosity and gap height, the leakage rate is greatly affected, and the fault diagnosis strategy of hydraulic leakage is put forward. 2) according to the leak fault diagnosis strategy, a hydraulic system working loop model of a heavy-duty mechanized bridge is established by using the hydraulic mechanical system modeling and simulation software AMESim. The leakage faults such as the leakage in the working loop of the thrust cylinder and the leakage in the lock hydraulic cylinder are simulated and analyzed, and the fault characteristics under different leakage conditions are obtained, which provides a theoretical basis for the diagnosis and prevention of the leakage fault. (3) extracting characteristic parameters such as pressure and flow rate from leakage fault simulation, and importing Matlab to obtain time domain eigenvalue, which can be used as data sample for leak fault diagnosis by support vector machine (SVM). By using the LibSVM training model of SVM pattern recognition software package, the location of leakage fault and the cause of leakage are accurately diagnosed. Thus, the feasibility and effectiveness of the method combining leakage fault modeling and simulation with support vector machine fault diagnosis are verified in this paper. 4) from the aspects of controlling the viscosity of hydraulic oil, controlling the height of hydraulic system crevice and the correct assembly of hydraulic pipeline, this paper analyzes and studies how to prevent the leakage of hydraulic system, and puts forward the countermeasures and methods to prevent leakage fault.
【学位授予单位】:国防科学技术大学
【学位级别】:硕士
【学位授予年份】:2012
【分类号】:TH137

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