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In recent years, new offshore platforms have been widely used, but safety issues have become increasingly prominent. A 1:30 experimental platform model was developed using physical model testing methods to optimize the anchoring scheme of the "National Sea Trial 1" platform at the National Marine Testing Ground. A study on the motion response of the model under two-point lying chain mooring state has been conducted with the combined function of over a hundred sets of irregular waves, fixed length winds, and equivalent uniform currents with different wave heights, wave periods, and wave directions at the Marine Dynamic Environment Laboratory of the National Ocean Technology Center. By analyzing the test results and corresponding design indicators of the test platform, it is shown that when the effective wave height is 1.5 m, the period is 5.35 s, the wind speed is 8 m/s, the flow rate is 1.14 m/s, the maximum roll angle of the platform is 10.41°, and the "National Sea Trial 1" platform crane cannot carry out normal lifting work; When the effective wave height is 5.1 m, the period is 6.95, the wind speed is 13 m/s, and the flow rate is 1.14 m/s, the maximum roll angle of the platform is 15.07°, and the test equipment carried on the platform cannot work properly; When the effective wave height is 9.23 m, the period is 10.22 s, the wind speed is 17 m/s, and the flow velocity is 1.14 m/s, the maximum roll angle of the platform is 20.21°. There is a safety hazard on the platform, and safety measures should be taken. The research results have verified the indexes of the improved National Marine Comprehensive Test Site "National Sea Trial 1" platform. Therefore, it is recommended to stop the testing operation of the "National Sea Trial 1" platform under level six sea conditions, and necessary risk avoidance measures should be taken under level eight sea conditions. This study provides a reference for the hydrodynamic research of similar new offshore platforms.
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