| A testing platform which carrying some equipment is always employed in evaluating the warship’s overall performance.Comparing to fix-piled testing platform,the mobile testing platform has a great advantage such as lower initial cost and easy maintenance,it is therefore significant to design and study a mobile testing platform.In this paper,a catamaran form is selected as the carrier of test equipment,and its structural member’s scantling is determined according to the requirements of CCS ‘Rules for Classification of Sea-Going Steel Ships’.Considering the sea environment in which the catamaran testing platform operates,based on linear three-dimensional potential flow theory,the six-degree freedom response of motion of unit amplitude(RAO)and the first-order wave force is calculated by using hydrodynamic software AQWA under diverse wave direction and frequency.Followed by the motion analysis conducted in time domain with consideration of effects coupled wave and mooring system.To evaluate the platform strength,FEM software ANSYS is used in checking the yielding strength under beam and diagonal wave condition and the region of stress concentration is found out.The hot spots above-found are chosen to analyze the fatigue strength in means of design wave approach based on S-N curve and fatigue cumulative damage theory,and the fatigue life of specified nodes is obtained. |
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