PRINCIPLES OF DETERMINING THE OPTIMUM ANGULAR POSITION FOR PROPELLER BLADES RELATIVE TO AN ENGINE CRANKSHAFT WITH REGARD TO TORSIONAL VIBRATION

In ships' propulsion systems the main engines and propellers are sources of torsional vibrations. A method is presented to allow determination of the angular position of the propeller blades in relation to the engine crankshaft, at which propeller excitation counteracts engine excitation. Problems associated with propeller torque are also considered. The application of the system has been demonstrated on the propulsion systems of two vessels. It was found that while the positioning of the propeller in relation to the crankshaft had a definite effect on the torsional vibration, this was mainly evident in cases where the excitation torque from the engine and the propeller were of the same order, and when the critical number of revolutions was close to their nominal range. In practice this was frequently found to apply to 6-8 cylinder engines with relatively short crankshafts and 4-bladed propellers. Order from: BSRA as No. 47,988.

• Corporate Authors:

  Polish Assoc of Mech Eng, Sec of Shipbuilders

  Rajaska 6
  80-850 Gdansk,   Poland 
• Authors:
  • Kmiecik, M
  • Teczynska, B
• Publication Date: 1976-7

Language

• Polish

Media Info

• Features: References;
• Pagination: 7 p.
• Serial:
  • Budownictwo Okretowe
  • Issue Number: 7
  • Publisher: Polish Assoc of Mech Eng, Sec of Shipbuilders

Subject/Index Terms

• TRT Terms: Engines; Propeller blades; Propellers; Torsion; Vibration
• Old TRIS Terms: Engine vibration; Propeller position; Propeller vibration; Torsional vibration
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00176838
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Jun 14 1978 12:00AM