If it is found, at a later design stage, that a ship is critical from the vibration point of view, one would need to know what alternatives are available that would deal effectively with the size of the excitation forces. This paper considers the hydrodynamic aspects of this problem, with the propeller as the source of excitation. The results of experiments and calculations which show the effect of after body form, propeller arrangement, different propeller data and fins on excitation force magnitudes are given. With a stringent treatment of the vibration problem for a ship design the measured or calculated excitation forces are used as input data for calculations of the "finite element" type. As such calculations are cost and time consuming, a need exists for simpler relationships between excitation levels and vibration levels, to give a first estimation of whether the accorded excitation forces are the expected causes of higher vibration levels. Such criteria are discussed in the paper. Order from BSRA as No. 48,993.

  • Supplemental Notes:
    • Presented at the 22nd Nordic Ship Technical Conference (NSTM 77) at Lingby in 1977.
  • Corporate Authors:

    Nordic Ship Technical Conference

    Malmo,   Sweden 
  • Authors:
    • Johnsson, C A
  • Publication Date: 1977-10


  • Swedish

Media Info

  • Pagination: 53 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00182523
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Oct 31 1978 12:00AM