As an alternative to other means of reducing the vibration of an accommodation structure, the Authors have developed a vibration-control apparatus which reduces hull vibration by producing an "artificial" vibration which counteracts the structural vibration. The apparatus, which has been found satisfactory in various tests in actual ships and whose construction and operation are described in the article, has the following features: (i) It senses vibration of the accommodation structure with an acceleration sensor and selects some fundamental waves. The apparatus operates automatically at the same frequency as, and opposite phase to the strongest fundamental wave. (ii) It can reduce any kind of hull vibration, irrespective of its source (propeller, main engine, etc.). (iii) It can be placed at any position in the ship. (iv) It produces artificial vibration by mechanism consisting of two electrically-driven shafts which have counterweighted wheels attached to them and which rotate in opposite directions; sine wave vibration is produced. (v) The amplitude of the exciting force can be altered by changing the counterweights. (vi) Where there are two or more strong fundamental waves in the accommodation structure vibrations, additional apparatus can be used to work against each of the waves individually. Order from BSRA as No. 50,719.

  • Corporate Authors:

    Hitachi Zonsen Company Limited, Technical Inst

    60, Sakurajima Kitanomachi, Konohanaku
    Osaka,   Japan 
  • Authors:
    • Kurata, N
    • Ohshima, H
  • Publication Date: 1978-12


  • Japanese

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00196025
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM