The hydrodynamic of marine data buoy and its mooring system has an important im-pact on its reliability, viability and adaptability at sea. In this paper, the numerical simulation, which is combined with physical model test verification, is adopted for studying hydrodynamic of data buoy, by using the measured data in the northern sea area of Chu Island, Weihai, Shandong Province, China. In the numerical analysis, the Advanced Quantitative Wave Analysis (AQWA) module in ANSYS is used, which includes frequency domain analysis and time domain analysis. The hydrodynamic performance of three different mooring systems, i.e. slack type, inverted S type and tension type, under the action of wind and waves coupling is studied. The model test of the buoy was carried out at the Environmental Laboratory in the National Ocean Technology Center of the Ministry of Natural Resources of China, and the scale of the model is determined to be 1:5, according to the laboratory test capacity and buoy prototype size. The results show that the inverted S type mooring system has higher reliability, while the tension type mooring system can obtain more accurate observation data, and the performance of the slack mooring system is between the two, among the three types of mooring systems. The research results can provide a reference for the design of other marine buoys and their mooring systems, and the validated numerical simulation method can be applied to the study of the survival performance of the buoy in long-term and extreme sea condition.
The laboratory test of the wave energy converter model is an important means to evaluate the performance of the device. At present, there are few performance tests for complete specifications under the irregular wave. Referring to the test methods and standards at home and abroad, combined with the actual test work experience in the laboratory, using the irregular wave power calculation formula with the effective wave height and the spectral peak period as parameters, then the wave-wire conversion ratio test method of the wave energy converter physical model under irregular waves in the laboratory is proposed. The method is applied to the basin test experiment of the physical model of the horn-shaped backward bent duct buoy (BBDB) wave energy converter. The research results show that the established test method and process of wave-wire conversion performance have achieved good application results in the irregular waves laboratory test, and can better reflect the device operating characteristics in real sea conditions. The test results provide data support for the model design of the wave energy converter in the next test stage, the demonstration test of the prototype, and the prediction of power generation in real sea conditions.
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