OPTIMIZING THE PROPELLER ANGLE POSITION WITH REGARD TO TORSIONAL VIBRATIONS OF DIESEL ENGINE SHAFTING

This article describes a new method for optimizing the angular propeller position with regard to torsional vibration. The optimal relative angle is ascertained theoretically and experimentally. The torsion critical of the order coinciding with the number of propeller blades is excited simultaneously by the harmonic tangential forces acting on the cranks of the crankshaft and by the harmonic of the same order from the propeller. Allowance must be made for this on installations with 6 to 10 cylinders, short shaftline and four-blade propellers, because they have the critical speed of the fourth order of the first-mode vibration in the upper speed range of the engine. The additional torsional stresses at this critical speed may reach unexpectedly high values if the propeller is fitted in the relative angle positions at which the two excitation points add up.

• Corporate Authors:

  Sulzer Brothers Limited

  CH-8401
  Winterthur,   Switzerland 
• Authors:
  • Schaerer, J
• Publication Date: 1974

Media Info

• Pagination: p. 29-34
• Serial:
  • Sulzer Technical Review
  • Volume: 56
  • Issue Number: 1
  • Publisher: Sulzer Brothers Limited

Subject/Index Terms

• TRT Terms: Measurement; Propeller shafts; Propellers; Torsion; Vibration
• Old TRIS Terms: Propeller shaft inclination; Propeller shaft vibration; Propeller vibration; Torsional vibration; Vibration measurement
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00057632
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Oct 5 1974 12:00AM