4 Procedure for experiment
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.141(76) - Revised Model Test Method Under Resolution 14 of the 1995 SOLAS Conference - (adopted on 5 December 2002) - Annex - Revised Model Test Method - 4 Procedure for experiment

4 Procedure for experiment

  4.1 The model should be tested in a long-crested irregular seaway defined by the JONSWAP spectrum with significant wave height HS, a peak enhancement factor γ =3.3 and a peak period TP = 4√HS, (TZ = TP /1.285). HS is the significant wave height for the area of operation, which is not exceeded by a probability of more than 10% on a yearly basis, but limited to a maximum of 4 m.

 Furthermore,

  • .1 the basin width should be sufficient to avoid contact or other interaction with the sides of the basin and is recommended not to be less than LBP + 2 m;

  • .2 the basin depth should be sufficient for proper wave modelling but should not be less than 1 m;

  • .3 for a representative wave realisation to be used, measurements should be performed prior to the test at 3 different locations within the drift range;

  • .4 the wave probe closer to the wave maker should be located at the position where the model is placed when the test starts;

  • .5 variation in Hs and TP should be within ±5% for the three locations; and

  • .6 during the tests, for approval purposes, a tolerance of +2.5% in HS, ±2.5% in TP and ±5% in TZshould be allowed with reference to the probe closer to the wave maker.

  4.2 The model should be free to drift and placed in beam seas (90° heading) with the damage facing the oncoming waves, with no mooring system permanently attached to the model used. To maintain a beam sea heading of approximately 90° during the model test the following requirements should be satisfied:

  • .1 heading control lines, intended for minor adjustment, should be located at the centre line of the stem and stern, in a symmetrical fashion and at a level between the position of KG and the damaged waterline; and

  • .2 the carriage speed should be equal to the actual drift speed of the model with speed adjustment made when necessary.

  4.3 At least 10 experiments should be carried out.The test period for each experiment should be of a duration such that a stationary state is reached, but not less than 30 min in full-scale. A different wave realisation train should be used for each experiment.

Parent topic: Annex - Revised Model Test Method
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