共查询到19条相似文献,搜索用时 218 毫秒
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从发动机状态监测的模糊评价方法入手,提出了采用遗传算法和专家打分的综合办法确定模糊评判模型的参数,建立基于遗传加权模糊综合评价方法的发动机状态综合评判模型,在MATLAB中编程计算,其结果比较理想,较单一的模糊综合评判方法准确率有较大的提高. 相似文献
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随着社会经济的不断发展,全球各国之间的贸易交流变得越来越频繁,水运海航线发展也变得尤为必要,由此对船舶功能提出了越来越严格的要求。在船舶航行中,其前行动力离不开内燃机的有力支持,而为保障内燃机的安全稳定运行,对其监测诊断方法进行研究有着十分重要的现实意义。本文首先阐述了船舶内燃机监测诊断技术,其次概述了船舶内燃机系统,最后探讨了船舶内燃机远程状态监测系统结构设计及展望了船舶内燃机监测诊断技术发展,旨在为促进船舶内燃机的可靠、稳定运行提供一些帮助。 相似文献
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对状态评估中常权重的不足,结合评估的模糊性与灰色性,提出基于变权灰色模糊综合评判的真空断路器状态评估方法。分析真空断路器故障,确定相关特征状态指标并进行层次性划分。指标的灰色权重采用组合权重法确定常权重,使用变权公式对常权重进行优化得到模部,灰部通过专家打分确定。灰色模糊状态矩阵采用云模型确定隶属度,通过灰色模糊综合评判法对真空断路器状态进行评估。以ZN63A-12型某真空断路器为例进行分析,结果与实际状况相符,证明该方法能够评估真空断路器真实运行状态。 相似文献
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应用振动法对柴油机气缸体上的振动信号进行分析,得出总振动量级主随活塞与气缸套磨损间隙的增大而适级放大.根据气缸体振动加速度响应功率谱图和柴油发动机总振动量级,可以确定活塞与气缸壁的间隙大小.应用油样铁谱分析技术,可以确定发动机的润滑状况及摩擦副的磨损程度和部位,并通过实例证明了其在柴油发动机故障诊断中的有效性.应用直读式原子发射光谱仪对柴油发动机润滑油油样进行检测,监控柴油发动机曲轴滑动轴承磨损状况,对保障发动机可靠运行起到很好的作用. 相似文献
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对船舶柴油机油劣化规律进行模拟氧化试验和船舶行驶试验研究,运用红外光谱和理化指标分析所取样品的酸值、碱值、闪点、氧化值等.结果表明,模拟样品和跟踪样品随着氧化时间和航程的增加,呈黏度增加、酸值升高、碱值降低,氧化值、硝化值增大的变质趋势,且理化指标和红外指标有很好的相关性.模拟氧化试验和跟踪取样的样品的红外和理化数据变化一致,因此可以用模拟试验的数据来预测实际样品的衰变.应用模拟氧化试验可以快速研究柴油机油的劣化规律,采取红外和理化相结合的方法能够评价柴油机油的质量变化程度,实现按质换油. 相似文献
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Various condition monitoring techniques were applied during a laboratory engine test in order to understand the wear processes occurring and to determine a suitable method which could be applicable to the detection and diagnosis of abnormal engine conditions in practice. Fuel consumption rates were measured in conjunction with chemical analysis of the used oil by Fourier Transform Infrared Spectroscopy, and the various contaminant inspection methods. For the contaminant inspection of the wear debris in the lubricating oil, the quantitative and qualitative techniques of the Rotary Particle Depositor (RPD), Particle Quantifier (PQ), Spectrometric Oil Analysis, and Image Analyser Systems were applied and the results compared. The effectiveness of each to be able to respond to wear failure was also compared. Evaluation showed that, of the methods examined, the combination of RPD and PQ was the most suitable technique for the detection of abnormal wear occurring in the engine combustion zone. It is, therefore, suggested that this combination can be directly applied to internal combustion engines as an effective condition monitoring method. 相似文献
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The absolute values of total base number (TBN) were determined for several sets of both fresh and used engine oil samples. Basic and acidic compounds from these oils have been extracted into water, 7% sea water and ethanol-water (1:1, v/v) mixtures. The extracts have been determined by potentiometric titration as pH extracts, TBN (water extract) and alkalinity. The oil formulations are not resistant to the presence of water but basic additives in fresh oil are more resistant than those for used oils. The percentage of TBN extractable into water significantly increases with service life. The presence of significant amounts of water in lubricating oil is serious and should form part of any lubricant condition monitoring system. The case is argued for both the use of dehydration canisters in oil systems and for the development of a new method of water content determination for used formulated lubricating oils which is quick, accurate and suitable for automated condition monitoring systems. The pH of aqueous extracts for condition monitoring of lubricating oils is shown to be only meaningful for TBN values of 2 or less. 相似文献
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介绍了汽车发动机润滑油分类方法,为确保车辆经常处于良好技术状况,延长车辆的使用寿命,阐述了如何根据发动机机型、发动机工作条件、季节气温、发动机性能和技术状况正确选用发动机润滑油的黏度级和使用级,并介绍了机油使用时的注意事项。 相似文献