共查询到19条相似文献,搜索用时 93 毫秒
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远程分布式车辆故障诊断系统 总被引:2,自引:0,他引:2
针对现代汽车结构复杂、技术含量高、故障诊断难度大等特点,提出了基于远程分布式车辆的故障诊断系统,并进行了研究.介绍了系统的总体架构与工作原理,对现场监测与诊断系统、远程诊断中心、网络通信系统和软件系统开发等进行了分析与探讨,最后研究了系统的主要实现技术,包括网络数据库技术、数据压缩与传输技术及系统安全性技术等. 相似文献
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基于Java的远程故障诊断系统的设计与实现 总被引:1,自引:0,他引:1
构建了一个远程故障诊断系统,并对其工作原理和基本结构进行了分析,研究和探讨了系统实现的关键技术客户端、服务器端、中间层、应用服务层与数据服务层的通信技术.最后运用以上技术建立了一个基于 Java的远程故障诊断系统,并给出了运行实例. 相似文献
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针对北京燕山石化炼油厂某烟气轮机进行旋转机械远程故障诊断的研究,设计并开发了远程故障诊断系统原型.首先通过转子实验台模拟烟机的振动信号,以LabVIEW为平台对转子振动信号进行获取和分析;然后利用BP神经网络的方法对其进行故障诊断;最后通过B/S结构网络体系的构建,完成整个远程故障诊断原型系统的开发. 相似文献
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构建基于CORBA的企业分布式远程监测与诊断系统 总被引:1,自引:0,他引:1
近几年,随着计算机网络的发展,传统的故障诊断技术正经历着向远程、智能化方向发展.本文对当前多种构造远程分布式系统的方法进行了对比,提出了基于CORBA技术构建远程监控与诊断系统的模式,并在我国某大型企业成功地实现了设备远程监控与故障诊断系统. 相似文献
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机电设备远程监测与诊断系统在LabVIEW平台上的实现 总被引:3,自引:0,他引:3
为了解决传统的监测与故障诊断系统难以实现远程监测与故障诊断的问题,文章在比较国内一些远程监测与故障诊断系统的基础上,介绍了一种新型的基于Internet和Intranet的远程监测与故障诊断系统。详述了系统中的几个技术特点:基于MIMOSA标准的数据库、系统与数据库动态信息交换和开放式的图形化设计语言LabVIEW开发平台。最终实现了此远程监测与故障诊断系统,并成功地加以推广应用。 相似文献
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The fault diagnosis of rotating machinery has attracted considerable research attention in recent years because such components as bearings and gears frequently suffer failure, resulting in unexpected machine breakdowns. Signal processing-based condition monitoring and fault diagnosis methods have proved effective in fault identification, but the revelation of faults from the resulting signals requires a high degree of expertise. In addition, it is difficult to extract the fault-induced signatures in complex machinery via signal processing-based methods. In this paper, a new intelligent fault diagnosis scheme based on the extraction of statistical parameters from the paving of a wavelet packet transform (WPT), a distance evaluation technique (DET) and a support vector regression (SVR)-based generic multi-class solver is proposed. The collected signals are first pre-processed by the WPT at different decomposition depths. In this paper, the wavelet packet coefficients at different decomposition depths are referred to as WPT paving. Statistical parameters are then extracted from the signals obtained via the WPT at different decomposition depths. In selecting the sensitive fault features for fault pattern expression, a DET is employed to reduce the dimensionality of the feature space. Finally, a SVR-based generic multi-class solver is proposed to identify the different fault patterns of rotating machinery. The effectiveness of the proposed intelligent fault diagnosis scheme is validated separately using datasets from bearing and gearbox test rigs. In addition, the effects of different wavelet basis functions on the performance of the proposed scheme are investigated experimentally. The results demonstrate that the proposed intelligent fault diagnosis scheme is highly accurate in differentiating the fault patterns of both bearings and gears. 相似文献
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针对传统故障诊断专家系统实用性弱等缺点,面向现场实际应用,提出了基于状态预警机制并且融自动诊断、状态巡检和常规专家系统诊断为一体的多层次故障诊断系统设计方案。该方案基于数理统计原理,通过正态性和平稳性检验实现状态预警机制;利用故障模型辨识和诊断规则的量化实现自动诊断;通过对诊断规则的总结形成诊断流程以实现故障普查。利用该设计方案,针对实际汽轮机组和水轮机组,开发了相应的实际应用系统,并取得了很好的应用效果。 相似文献
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针对满足Lipschitz条件的非线性系统,提出了一种鲁棒的控制器时变故障的诊断方案。方案通过采用观测器技术跟踪系统的输出,从而得到残差,根据所得到的残差是否已超过了设定的域值,再通过自适应跟踪器,对故障进行跟踪,从而完成对控制器故障的诊断。同时还对所提出的故障诊断结构的鲁棒性、灵敏度和稳定性作了分析。最后,通过一个简单的仿真例子进一步验证了提出方案的可行性。 相似文献
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In this paper, an adaptive fault detection scheme based on a recursive principal component analysis (PCA) is proposed to deal with the problem of false alarm due to normal process changes in real process. Our further study is also dedicated to develop a fault isolation approach based on Generalized Likelihood Ratio (GLR) test and Singular Value Decomposition (SVD) which is one of general techniques of PCA, on which the off-set and scaling fault can be easily isolated with explicit off-set fault direction and scaling fault classification. The identification of off-set and scaling fault is also applied. The complete scheme of PCA-based fault diagnosis procedure is proposed. The proposed scheme is first applied to Imperial Smelting Process, and the results show that the proposed strategies can be able to mitigate false alarms and isolate faults efficiently. 相似文献
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提出了一种 F M S 设备在、离线集成状态监控和故障诊断的技术方案;重点研究了监控计算机和精密诊断系统之间的串行通信接口和实时监控与诊断信息的传输方式,建立了 F M S 设备故障的实时显示、报警和故障精密诊断专家系统的集成系统。 相似文献
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为综合利用多属性信息和历次故障搜索结果反馈信息进行故障诊断,提出一种基于贝叶斯网络和理想解动态群决策的故障诊断方法。以砼泵分配阀液压系统为例,利用贝叶斯网络对系统进行分析并求解根节点的后验概率和关键重要度;根据本次诊断成功与否对下次最优搜索决策影响程度的大小,定义出启发函数求解启发式信息价值;考虑后验概率、关键重要度和启发式信息价值等因素,利用基于熵权的理想解法求取搜索方案的群体理想解和逆理想解,得到故障搜索最佳方案;考虑历次故障搜索最佳方案对当前搜索方案的影响,最终求得故障搜索的最佳方案序列。该方法克服了单属性决策和群决策方法的不足,提高了故障诊断的可行性和诊断效率。
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