Torsional systems of marine propulsions are simulated by multiple inertias connected by linear springs and linear viscous absolute- and relative damping values. Absolute damping is acting between a global system without rotation and the rotating inertias of engine, propeller and auxiliary drive. Relative damping is acting in between inertias. Inertia and torsional stiffness is predicted by calculation and can easily be verified by measurements. Damping values are roughly estimated by various empirical methods. The measured vibratory stress of an intermediate shaft allows different damping identifications. Discrepancies in damping models for engines and propellers currently used will be presented. General numerical problems of various identifications will be shown as well.
Torsional vibration damping in a marine propulsion system driven by a two-cycle diesel engine
Torsionsschwingungsdämpfung in einer durch einen Zweitakt-Dieselmotor angetriebenen Schiffsantriebsanlage
2003
7 Seiten, 9 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
VIBRATION DAMPING AND NOISE REDUCTION DEVICE AND MARINE DIESEL ENGINE PROPULSION POWER MODULE SYSTEM
Europäisches Patentamt | 2020
|Torsional vibration in the diesel engine
Engineering Index Backfile | 1926
|Marine Propulsion Diesel Engine Progress
SAE Technical Papers | 1988
|Computer-aided design of diesel engine driven systems for acceptable torsional vibration
Kraftfahrwesen | 1983
|