共查询到18条相似文献,搜索用时 250 毫秒
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为了提高船舶维护效率,提出一种多传感器融合下船舶机电系统多发故障信号监测方法。根据故障状态下的信号频率,使用小波变换法提取故障信号特征参数作为蚁群算法优化BP神经网络输入,实现多发故障诊断,并通过DS证据理论完成多传感器数据融合,得出故障诊断结果。实验结果表明,该方法可通过多传感器融合判断出船舶机电系统故障类型,即使一种传感器出现故障也不影响诊断效果,诊断船舶机电系统多发故障平均准确率高达97.02%,能够实现较为精准的船舶机电系统多发故障监测。 相似文献
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为进一步提高船舶柴油机故障诊断的可靠性,将一种基于模糊信息多级融合的故障诊断方法应用到船舶柴油机的故障诊断中,该方法将各级诊断数据充分融合后再进行船舶柴油机的故障诊断,应用结果表明该方法准确有效,不但在正常情况下作出了准确的故障诊断,而且在局部检测传感器失灵发生误检的情况下亦能避免船舶柴油机故障诊断的误判,为提高船舶柴油机故障诊断的可靠性提供了有益的借鉴. 相似文献
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XIEChun-li XIAHong LIUYong-kuo 《船舶与海洋工程学报》2005,4(1):30-33
The work condition of nuclear power plant (NPP) is very bad, which makes it has faults easily. In order to diagnose the faults real time, the fusion diagnosis system is built. The data fusion fault diagnosis system adopts data fusion method and divides the fault diagnosis into three levels, which are data fusion level, feature level and decision level. The feature level uses three parallel neural networks whose structures are the same. The purpose of using neural networks is mainly to get basic probability assignment (BPA) of D-S evidence theory, and the neural networks in feature level are used for local diagnosis, D-S evidence theory is adopted to integrate the local diagnosis results in decision level. The reactor coolant system is the study object and we choose 2# steam generator Utubes break of the reactor coolant system as a diagnostic example, The experiments prove that the fusion diagnosis system can satisfy the fault diagnosis requirement of complicated system, and verify that the fusion fault diagnosis system can realize the fault diagnosis of NPP on line timely. 相似文献
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LIUYong-kuo XIAHong XIEChun-li 《船舶与海洋工程学报》2005,4(1):34-38
The fuzzy logic and neural networks are combined in this paper, setting up the fuzzy neural network (FNN) ; meanwhile, the distinct differences and connections between the fuzzy logic and neural network are compared. Furthermore, the algorithm and structure of the FNN are introduced. In order to diagnose the faults of nuclear power plant, the FNN is applied to the nuclear power plant, and the intelligence fault diagnostic system of the nuclear power plant is built based on the FNN . The fault symptoms and the possibility of the inverted U-tube break accident of steam generator are discussed. In order to test the system‘ s validity, the inverted U-tube break accident of steam generator is used as an example and many simulation experiments are performed. The test result shows that the FNN can identify the fault. 相似文献
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针对IEEE三比值法对油浸式变压器故障诊断的缺码和多种故障发生时的难诊断现象,建立标准故障序列,利用灰色关联度原理判断故障气体与标准序列的关联程度,根据模糊熵的原理计算故障气体与标准模型的相对熵,相对熵最小的标准序列即为变压器的绝缘故障.实验结果证明,该方法能较好地解决三比值法的缺码现象,能准确地判断变压器的绝缘故障,提高电力系统的可靠度,维护系统安全. 相似文献
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为提高主机燃油的粘度控制,保证船舶动力性能,为燃油粘度控制系统建立相应的数学模型,借助Matlab模糊逻辑工具箱设计粘度控制器并在Simulink平台上对该系统进行仿真分析。仿真结果表明,Fuzzy-PID控制算法的设计极大地改善了系统各项性能,是一种有效的控制方法。 相似文献