source: MMG 3D philosophy of theory behind MMG : THESIS ( from p. 39 to 46) This note will explain in brief, simple but sufficient to understand the story behind MMG and how to understand it. Starts with: 1. Coordinate systems 2. Motion equations 3. Hydrodynamic forces - acting on hull, force by propulsion and forces by steering. 4. Tests for obtaining the coefficients: RFT - in straight moving with B = 0 ( hull drift angle equal 0). OTT - the ship is towed in oblique. ( B is not 0. ). This OTT is performed with r' = 0 where there is no yawing involved. CMT - the ship model is kept captive and towed at certain r' yawing rate. The rate is covered normally from 0.2, 0.6 and 0.8. RFT - in oblique towing and steady turning. This test is to obtain flow straightening coefficient test. ----------------- In calculating hydrodynamic derivatives, LSM is applied. ...
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