In Norway in 1971, a government-sponsored project was initiated in which Det norske Veritas and shipping and insurance companies undertook studies for the provision of an instrument to give warning of excessive hull stresses in heavy weather. As a result, the Wedar (Weather Damage Reduction) system was developed jointly by DNV and the Noratom-Norcontrol subsidiary A/S Kilsund Industrier, and it has been fitted to a number of large tankers and other ships taking part in a scheme in which daily readings and other data are reported to a shore establishment for analysis. The reports have shown that the system is a valuable aid during rough-weather navigation of large and/or fast ships. The article briefly describes the Wedar System. Sensors in the form of strain gauges are installed amidships, one on each side of the ship, to measure stresses due to horizontal and vertical bending moments, and an accelerometer fitted forward senses vertical motions of the bow. The signals from the three sensors are processed and analogue readings are displayed on three corresponding dials in the wheelhouse to give a warning if a predetermined response level is reached. The display is updated every 11 sec. The system can also display hogging and sagging moments in still-water conditions to indicate whether the loading pattern is correct. Order form: BSRA as No. 47,238.

  • Corporate Authors:

    Whitehall Technical Press Limited

    29 Palace Street, Westminster
    London SW1,   England 
  • Publication Date: 1977-7

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Filing Info

  • Accession Number: 00168256
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jan 30 1978 12:00AM