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Experimental Methods in Marine Hydrodynamics (实验方法在海洋流体动力学)
Conventional Ship Testing Experimental Methods in Marine Hydrodynamics Lecture in week 34 Chapter 6 in the lecture notes 1 Conventional Ship Testing - Topics: • Resistance tests • Propeller open water tests • Propulsion tests • Cavitation tunnel tests – Cavitation observation – Pressure pulses – Noise measurements – Cavitation erosion • Maneuvering tests – Free running maneuvering tests – Planar Motion Mechanism (PMM) tests 2 Resistance tests • Test procedure: – The model is accelerated to wanted speed – speed is kept constant for at least 10 seconds (or at least 10 load cycles) – Average values of the measurements for the period of constant speed is calculated A/D Filter Amplifier Towing Carriage Measurement of: Model resistance R Tm Resistance Model speed Dynamometer Sinkage fore and aft Ship model Flexible connection 3 Required length of measurement • The tow force might fluctuate considerably, especially for models with low Drag/Displacement ratio and large displacement • In such cases, one needs at least ten oscillation
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