Optimum Phasing of Engine and Propeller in Marine Propulsion Systems with Direct-Coupled Two-Stroke Engines

Format:

Conference/Event

Author/Creator:

Taraza, Dinu, author.

Conference Name:

International Off-Highway & Powerplant Congress & Exposition (1994-09-12 : Milwaukee, Wisconsin, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1994

Summary:

In marine propulsion systems with direct-coupled two-stroke large diesel engines, the angular position of the propeller with respect to the crankshaft remains unchanged during the whole operation of the engine.The interference between major harmonic orders of the engine torque is avoided by choosing a number of blades, different from any divisor of the cylinder number. However, interferences between other harmonic orders of the engine torque and the major harmonic order of the propeller torque -which is equal to the number of blades- may increase the amplitude of torsional vibrations.The paper shows that there is an optimum Phasing between crankshaft and propeller for which a decrease, up to 20%, of the dynamic shear stress of the shafting -in comparison with the worst possible phasing- may be achieved. This results points out the importance of being able to calculate, in the design stage, the best phasing of engine and propeller

Notes:

Vendor supplied data

Publisher Number:

941698

Access Restriction:

Restricted for use by site license