Ship power plants and their elements (main and auxiliary)

Received: 15.02.2024. Revised: 04.03.2024. Accepted: 10.06.2024.

Original article

https://doi.org/10.24866/2227-6858/2024-2/21-27

Lapin Y.A., Gribinichenko M.V., Portnova O.S.

Yuriy A. Lapin, Postgraduate student, Far Eastern Federal University, Vladivostok, Russian Federation, lapin.iua@dvfu.ru   

Matvey V. Gribinichenko, Associate Professor, Head of Department of Mechanical Engineering, Marine Engineering and Transport of the Engineering Department, Polytechnic Institute, Far Eastern Federal University, Vladivostok, Russian Federation, gribinichenko.mv@dvfu.ru

Olesya S. Portnova, Associate Professor of Department of Mechanical Engineering, Marine Engineering and Transport of the Engineering Department, Polytechnic Institute, Far Eastern Federal University, Vladivostok, Russian Federation, portnova.os@dvfu.ru

Accuracy evaluation of the marine diesel engines harmonic excitation moments determination by means of the simplified indicator diagrams

Abstract. The article considers the calculated simplified indicator diagrams applicability to the forced torsional vibration calculation in power plants with diesels having systems for limiting the maximum combustion pressure. It is briefly described how and why the maximum combustion pressure is limited in modern marine diesels. The actual and simplified indicator diagrams are given, as well as the diagrams of torque from gas pressure forces for a modern low-speed two-stroke diesel engine. Harmonic analysis results for these diagrams are presented. The study results showed that simplified indicator diagrams using is unacceptable when calculating forced torsional vibration of systems with diesels having variable fuel injection angles. Also, performed work has shown the expediency of considering resonances from 12 to 24 orders when performing torsional vibration analysis for such power plants.

Keywords: torsional vibration, ship diesel engines, harmonic analysis

See the reference in English at the end of the article

For citation: Lapin Y.A., Gribinichenko M.V., Portnova O.S. Accuracy evaluation of the marine diesel engines harmonic excitation moments determination by means of the simplified indicator diagrams. FEFU: School of Engineering Bulletin, 2024, no. 2(59), pp. 21–27. (In Russ.).