Failure analysis in single-cylinder diesel engine SK-MDF300 through acoustic emissions

In the present study, the diagnosis of a single-cylinder diesel engine is evaluated through acoustic emissions. The acoustic signal from four engine locations, which include the engine block, the injection system, the fuel tank, and the fuel pump, is analyzed using the medium quadratic root technique. The analysis is carried out at a fixed speed of 3200 rpm and a load percentage of 20%, 40%, and 80%. The results obtained show that the comparison of the acoustic signals of two different time periods allows to quickly and easily evaluate changes in the engine conditions. The sensitivity of acoustic emissions makes it possible to identify different engine load conditions. The study of the acoustic signal in different engine locations allowed to identify the injection system as one of the main areas prone to fail or changes in its operating condition. Additionally, the analysis method based on the acoustic signal RMS allowed to clearly identify faults in the injection system. The above could be done by comparing signals and analyzing the variability of the signal. Therefore, the ability of acoustic emissions to perform a rapid and low-cost diagnosis is demonstrated, without requiring relevant physical modifications to the engine.