Diagnosis for Fuel Oil Line for Marine Diesel Engine by Sense of Touch

Abstract

The experienced crew can diagnose the fuel oil line by the touch on the fuel injection pipe. The aim of this research is to develop a new diagnostic system for the fuel oil line of marine diesel engine by the sense of touch in order to substitute for the crew's diagnosis.
This paper discusses the experiment of diagnosing the fuel oil leakage from the fuel injection pump by the accelerometer fixed on the fuel injection pipe. The original vibration is analysed through (1) power spectrum analysis, (2) filtering analysis, and (3) absolute value analysis.
The distinctive signal is found at the time of the combustion. The attenuation time of the signal at the normal condition becomes shorter than that at the abnormal.