共查询到19条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
5.
通过监测系统在线采集柴油机瞬时转速数据并进行频谱图形分析,实时监测柴油机工作状况,对影响柴油机做功不良的故障进行判断分析,并定位故障缸。实际应用表明,该系统能够在柴油机状态恶化初期及时发现故障,避免了柴油机故障扩大化。可对柴油机实际检修工作起指导作用。 相似文献
6.
7.
提出一种新的柴油机瞬时转速信号的故障特征的提取方法,柴油机瞬时转速信号经过小波降噪处理,有效地剔除柴油机瞬时转速信号的噪声干扰,提高信号的信噪比。提取单缸作功冲程峰谷值差值作为特征值,通过时域曲线和特征值变化曲线可以明显看出单缸断油的故障,建立起能量到柴油机故障的映射关系,最后利用BP神经网络训练可以得到很好的效果。 相似文献
8.
本文首先给出了柴油机转速的测量方法,然后详细介绍了利用循环转速检测柴油机调速性、进行无外载加速测功,利用瞬时转速检测气缸气密性和工作缸动力性的原理和实践。分析和实践表明,通过柴油机转速的测量与分析,可以得到有关机器运转状态和相关故障的丰富信息。因此转速分析是柴油机状态检测与故障诊断行之有效的方法。 相似文献
9.
柴油机转速的测量与应用 总被引:11,自引:0,他引:11
本文首先给出了柴油机转速的测量方法,然后详细介绍了利用循环转速检测柴油机调速性、进行无外载加速测功,利用瞬时转速检测气缸气密性和工作缸动力性的原理和实践。分析和实践表明,通过柴油机转速的测量与分析,可以得到有关机器运转状态和相关故障的丰富信息。因上转速分析是柴油机状态检测与故障诊断行之有效的方法。 相似文献
10.
11.
12.
Guixin Wang Xiaobo Li Yanpan Su 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2019,41(18):2266-2280
In this paper, a working-process simulation model was established, and the characteristics regarding the diesel engine maximum output power were analyzed under different limiting parameters. The design margin of the marine diesel engine is obtained through numerical and experimental study. Then, the simulation model and single cylinder diesel engine test were used to investigate the theoretical determination method of limiting characteristic lines and design margin area. It can be found that using least-square method to fit the calculation results can achieve quantitative analysis of limiting characteristics, and then the design margin area can be confirmed. The analysis results show that the maximum output power of the diesel engine is limited by in-cylinder pressure, turbine speed and exhaust temperature. The limiting parameters of maximum output power are different at different speeds, and the trend with speed of maximum output power are also different under different limiting parameters. Furthermore, the analysis of the operating area shows that the margin of the marine diesel engine at rated speed is about 27%, and there is a large design margin when operating at high speed. 相似文献
13.
14.
柴油机缸套间隙超磨耗标准故障监测诊断研究 总被引:2,自引:0,他引:2
介绍了多缸柴油机(6135G)的超磨耗标准的活塞—缸套间隙进行状态监测及故障诊断的研究。针对多缸柴油机的超磨耗标准缸套间隙进行分析,在此基础上选择与活塞—缸套工作状态有关的监测诊断参数,探讨气缸压力、机体振动、瞬时转速与活塞—缸套工作状态的关系并进行试验,利用各种分析方法,从中提取诊断特征作为状态监测及故障诊断信息。 相似文献
15.
16.
17.
18.
针对内燃机瞬时转速信号的非平稳性特点,将EMD方法用于瞬时转速信号的时频分析,将其自适应分解为几个基本模式分量和剩余值序列;对各个基本模式分量进行Hilbert变换得到Hilbert谱,从而得到瞬时频率和振幅随时间的变化规律,并进一步得到了EMD边界谱。实验测量6-135型柴油机正常和故障状态下瞬时转速信号,对其进行EMD分析表明:瞬时转速EMD边界谱可以指示有无故障发生,而瞬时频率和分解剩余值序列可以指示故障缸位置,二者结合可以较好地实现内燃机的故障诊断,为基于瞬时转速的内燃机故障诊断提供了一条新的思路。 相似文献
19.
The diesel engine, due to its superior efficiency when compared to other thermal engines, is widely used for propulsion of marine vessels. Since in such applications the power concentration is critical, most marine diesel engines are of the turbocharged type. Turbocharging has a serious effect on engine performance due to the interaction between the turbocharger and the engine. This interaction makes the detection of engine faults extremely difficult since a specific fault affects the turbocharger and through it the engine. For this reason various methods have been proposed for the detection of engine faults. The present author has in the past presented a method for marine diesel diagnosis by processing measured engine data using a simulation model. In the present work a completely different approach is followed; an attempt is made to use a simulation model to predict marine diesel engine performance under various fault conditions. The method is applied to a newly built vessel powered by a slow speed two stroke marine diesel engine. Using the engine shop trial data obtained under propeller law the simulation model constants are determined, using an automatic method that has been developed. The comparison of results obtained with the data from the official shop trials confirms the accuracy of the model and its ability to predict almost all operating parameters of the engine. The model is then used to produce results by simulating various engine faults or faults of its subsystems. From this analysis their impact on various measurable engine parameters is determined. It is interesting to see that in the case of turbocharged engines some faults have a different effect when compared to naturally aspirated ones. Also, it is revealed that without the use of modeling in many cases it is relatively difficult to determine the actual cause for an engine malfunction, since the observed effects on engine performance are similar. The proposed method is promising and assists the engineer to understand the actual effect of various faults on engine performance. Also it can be used as a training tool since it is easy to simulate various engine faults, a procedure which is extremely difficult, if not impossible, to perform on the field. 相似文献