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Autori: V. A. Soloiu and J. Jenzer
Editorial: Proc. of the International Symposium on Marine Engineering - ISME Tokyo, pag.561-568, vol. II, October,, 2000.
In this study is investigated the possibility of removal of the barred speed range by reducing only one harmonic component of the excitation, that one responsible for resonance within the barred speed range. The active torsional vibrations control was based on a pilot injection and delayed combustion while keeping mean indicated pressure (m.i.p.) at the required value for a normal operation of the marine engine on the propeller law. The Sulzer two stroke 6RTA62 marine Diesel engine coupled to a fixed pitch 4-blade propeller through an intermediate and propeller shaft were analyzed. The results of the investigations of the combustion law within a large range of injection timings, showed that the refined fuel injection characteristic decreased the amplitude of the dangerous harmonic component of the excitation and the shafting stress within the barred speed range as low as three times. It was proven that no barred speed range would be necessary for the fully satisfactory operation of the engine.
Cuvinte cheie: active vibration control, operation and propulsion system, propellers and shafting, combustion