4.4 General experimental set-up
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1200 – Interim Guidelines for Alternative Assessment of the Weather Criterion – (24 May 2006) - Annex - Interim Guidelines for Alternative Assessment of the Weather Criterion - 4 Guidelines for Experimental Determination of the Angle Φ1 - 4.4 General experimental set-up

4.4 General experimental set-up

Parent topic: 4 Guidelines for Experimental Determination of the Angle Φ1

4.4.1 Instrumentation

 The instrumentation system should be appropriate to the model and type of test carried out. The use of non-intrusive measurement systems is recommended when feasible. If it becomes necessary to attach cables to the model then care should be taken to minimize interference.

4.4.2 Calibration

 In order to ensure accurate operation of instrumentation, calibrations should be carried out and reported.

4.4.3 Measurements

 Roll, and yaw if necessary, should be simultaneously measured and recorded as appropriate to the purpose of the test. Wave height measurements should be made for all tests with wave probes fixed in the tank.

4.4.4 Wave quality

 Wave generation quality should be assessed for the waves corresponding to the minimum and the maximum frequency used in the tests. The wave elevation should be measured by wave probes positioned at least 3 locations along the length of the basin, spanning the drift range of the model. This should be done without the model because the model can disturb incident waves. When the measured double amplitude of the wave elevation converges to a certain value, this value should be regarded as the wave height, H, for each position. Variations in wave height and wave period should be within ±5% among the different measured positions for the same signal.

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