Diagnosis of parts inside the cylinder of marine diesel engine by analysing vibration signals

The serious wear of the piston-liner in an marine diesel engine occurs frequently and affects not only its reliability but also its performance. It is important for us to develop the diagnosing technique to detect it. In this paper the basic vibration diagnosing principle and method by analysing the vibration signals were presented, the exciting forces of moving components were calculated under different working conditions by measuring the vibrations at multipoints. Finally, the relations between the feature parameters of the vibration signals and the working conditions are obtained.