共查询到18条相似文献,搜索用时 109 毫秒
1.
2.
飞机液压管路是飞机液压系统中非常重要的组件,其出现裂纹故障将导致飞机出现严重的安全故障。针对循环压力冲击下的液压管路裂纹泄漏故障诊断,在飞机液压管路动力学分析的基础上,设计了循环压力冲击下裂纹故障检测多模式拓扑结构,通过流挖掘算法提取飞机液压管路裂纹泄漏故障特征来实现故障诊断,在试验台架中真实模拟飞机液压管路裂纹泄漏故障来验证故障监测方法的可靠性。试验结果表明,采用流挖掘算法的故障诊断方法能够快速的监测出飞机液压管路的裂纹泄漏故障。 相似文献
3.
4.
5.
针对盾构机液压推进系统的故障诊断问题,以在芜湖长江隧道项目过程中所使用的大型液压驱动型泥水盾构机为研究对象,分析了盾构机液压推进系统的工作原理,总结了推进系统中液压缸泄漏、换向阀泄漏及溢流阀泄漏故障模式的发生机理及其对推进系统造成的影响。利用AMESim平台建立推进系统模型,对液压缸泄漏、换向阀泄漏及溢流阀泄漏3类故障进行仿真分析,并提取液压缸推进速度、推进行程、无杆腔流量和系统压力4种推进参数的仿真数据。仿真结果表明:发生液压缸泄漏故障时,活塞杆无法伸出,推进速度为0;发生换向阀泄漏故障时,液压缸出现自走现象,推进速度明显降低;发生溢流阀泄漏故障时,系统压力明显降低,液压缸无法克服阻力向前推进。为后续盾构机推进系统的故障诊断和预测提供了有价值的参考。 相似文献
6.
7.
8.
随着旧设备的改造更新和企业装备水平的不断提高,液压装置的应用日益广泛.但是液压装置普遍存在两大问题,一是故障较多,造成故障的主要原因往往是液压油不清洁;二是液压系统存在着不同程度的泄漏.液压系统的泄漏不仅造成了价格昂贵介质的流失,而且污染了环境.我厂炉顶、炉前液压设备就曾由于液压系统的泄漏,发生过多起火灾事故.因此,液压系统泄漏的防治是设备管理维护中亟待解决的问题. 密封是解决液压泄漏问题最重要、最有效的手段.造成密封件功能降低或丧失的因素是多方面的.例如,密封结构设计不当,元件制造精度不高,密封件质量有缺陷、安装维护不得法等.只要了解和掌握密封件的密封机理,正确设计密封结构,保证制造和装配精度,选购合理的密封元件,液压系统泄漏问题是完全能够解决的. 相似文献
9.
10.
针对盾构机液压推进系统的智能故障诊断系统设计的相关问题,以中铁十四局在工程项目中使用的泥水盾构机为研究对象,介绍了盾构机液压推进系统的工作原理,利用故障影响模式及危害性分析(Failure Mode, Effects and Criticality Analysis, FMECA)方法对推进系统的故障模式和故障机理进行了梳理总结,并根据推进系统的工作原理,结合AMESim软件建立了系统的仿真模型,通过修改模型参数模拟出液压缸泄漏、溢流阀泄漏、换向阀泄漏、调速阀损坏4种常见故障模式。在此基础之上,提出基于有源自回归(Auto-Regressive with Extra Inputs, ARX)模型和模糊C-均值聚类(Fuzzy C-means, FCM)聚类相结合的故障诊断方法,该方法利用ARX模型对多传感器数据进行融合,提取不同故障模式的故障特征,并通过FCM算法根据故障特征对不同的故障模式进行诊断识别。仿真结果表明,基于ARX-FCM的故障诊断方法可以对每种故障模式进行精准的识别,能够有效的应用于盾构机液压推进系统的故障诊断系统设计中。 相似文献
11.
12.
13.
《Measurement》2014
The leakage is a common fault in the hydraulic system of the large forging hydraulic press. The large forging hydraulic press is usually used in the high temperature situations. Hence once leakage happens, the fire hazard can be caused and the huge economic losses can be taken place. Therefore, detecting and positioning leakage is also of great importance for the fault diagnosis of hydraulic system. A new method of fault diagnosis is proposed based on extracting leakage information in this paper. Firstly, the double inverse limit space is established. Secondly, the leakage information will be mapped into the double inverse limit space via the homeomorphism mapping. The leakage is detected with equicontinuity. The leakage positioning can be realized according to the topological transitivity in the double inverse limit space. Finally, the method of fault diagnosis is feasible according to the simulation results. Hence the fault diagnosis of hydraulic system in large forging hydraulic press is realized by adopting the method proposed in this paper. The leakage can be forecasted in real-time. 相似文献
14.
The failure of the hydraulic Inlet guide vane (IGV) system needs to be avoided in the gas turbine compressor, since the IGV system is critical for the function and efficiency of the gas turbine and its fault can even cause the gas turbine to jump off the power grid. This paper investigates the detection of external and internal leakages, whose levels can be represented through corresponding leakage coefficients, at the cylinder in the hydraulic IGV system. Based on the dynamic model, we propose the recursive ridge regression parameter estimation method to detect and isolate different leakage coefficients under varying load. The developed algorithm is verified through experiments in a hydraulic IGV emulator. Based on experimental results, the proposed scheme can estimate leakage coefficients with good performance. 相似文献
15.
16.
17.