Graphical analytic method of obtaining torquevs- RPM curves for a combined marine power plant

Abstract

Object and purpose of research. This paper discusses combined marine power plants to develop an operational harmonization procedure for different main engines in steady running conditions at partial load. Subject matter and methods. Graphical and computational analysis of propulsion system elements working jointly. Main results. Development of procedure for construction of torque-vs-RPM curves of combined power plant, with demonstration of its practical application for a ship with CODAG power plant. Conclusion. Main engine operation in terms of torque-vs-RPM curve is the best indicator for technical condition of propulsion system elements for a sea-going ship. If torque-vs-RPM curve for “newly built” condition is available, reliability of the engine could be kept at almost the maximum level by means of preventive maintenance.