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Due to the complexity of the fault mechanism and the testing method, the research on the Design for Testability (DFT) for mechanical system becomes difficult. In this paper, according to characteristics of mechanical system, it puts forward using the combination of the Bayesian Networks (BN) and the dependency matrix for testability modeling. The method gives full play to BN's probabilistic reasoning...
A method was studied to diagnose diesel misfire fault and ascertain the misfire cylinder number based on recognizing the vibration signal peak points of diesel cylinder head. Based on time-domain characteristics of waveform, seven criteria were described. The computer algorithm to identify time-domain waveform peak and locate misfire cylinder order number without top dead center signal was extracted...
Diesel fuel injection play an important role in fuel combustion, so it has directly impact on engine thermal efficiency, mechanical load and thermal load as well as exhaust and noise. In this paper a pressure transducer which was clapped on the high pressure line was used to measure the fuel pressure in the high pressure line. In processing and analyzing the pressure signals, the advanced fuel delivery...
Instantaneous speed plays an important part in technical state detection on armored vehicle engine. In this paper, a method for measuring and analyzing the instantaneous rotational speed of the armored vehicle engine is introduced. As it is difficult to extract the characteristic parameter of instantaneous rotational speed signal during evaluating the technical state of the armored vehicle engine,...
In equipment monitoring and fault diagnosis, correctly evaluating and selecting the signal features contribute greatly to the effectiveness and accuracy of recognition result. Because it is difficult to create a criterion to evaluate the feature of measured signals in condition of small samples when we use traditional statistic pattern recognition theory to do this, this paper put forward a method...
Measured the instantaneous speed of diesel engine and analyzed the mechanism of fault diagnosis with speed signal. Processed the speed signal with method of spectrum analysis and complexity analysis and analyzed the change law of speed in condition of mis-cylinder. Calculated [K,C] complexity of speed signal and got the features of mis-cylinder fault. Set up a BP neural network to diagnose mis-cylinder...
This paper has measured the wear data of engine cylinder in its whole lifetime in way of capacitance measure. Though this method we got accurate data. This paper analyzed the wear characteristic, causes and influence factors of cylinder, obtained the wear trend of cylinder along its working time, and determined the wear limit. Based on these, an artificial neural network model was set up to predict...
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