Experimental Research On The Structure Shape Of Buoy-Rope-Drum Wave Power Device

In recent years, In order to control the pollution of the environment, solve the energy crisis, development of renewable clean energy has become the top priority, and new energy industry is increasingly brought to the attention of the world. Our country is a major maritime country, Marine energy contains extremely abundant, therefore, Actively developing Marine renewable clean energy technologies has become an important goal of our country’s new energy strategy.The thesis topic is based on the project of Buoy-rope-drum wave power technology research and experiment which is funded by the National Renewable Energy Special Fund, revolves around the buoy’s shape of Buoy-rope-drum wave power device. The Buoy-rope-drum wave power technology is a kind of power generation which use oscillating buoy, the technology mainly use rope-drum structure to absorb wave energy, also it has more features, such as simple structure, low cost, high efficiency and so on.The main purpose of the thesis is to seek a suitable buoy’s shape and structure in order to collect maximum wave energy, the research content has important theoretical and practical significance for the completion of the project. the research content is as follows:1. It will give a brief introduction for the principle of Buoy-rope-drum wave power device, analysis the hydrodynamic of the buoy, summarize the calculation method of added mass in heave direction, and deduce the buoy’s wet frequency in the state of undamped free vibration. Combine with the ball spring vibration system, author deduce the heaving response equation of the buoy, and give the expression of absorbing wave energy in heave direction.2. It will calculate the water depth of different bottom shape buoy which have the same weight, and deduce their wave forces expression, at last, according to the theoretical derivation, combined with the actual conditions, find the measuring method of buoy’s added mass.3. According to the resonance buoy and floating buoy, it will use the heaving response equation of the buoy to analysis the wave frequency affect on the buoy’s heaving amplitude, and seek the magnification between buoy amplitude and wave amplitude in the state of resonance. 4. Based on the ANSYS-AQWA software, author make the simulation analysis of the three different bottom shape buoy’s motion, compare the added mass, wet frequency and wave forces in heave direction, obtain the conclusion that convex bottom shape buoy has the minimum added mass and the biggest wave force. After that, author make the simulation analysis of the resonance buoy and floating buoy, compare the buoy’s heaving amplitude, obtain the conclusion that the resonance buoy’s heaving amplitude is greater than floating buoy, but the damping force has the greater affect on resonance buoy than floating buoy.5. It will use the experiment data of buoy hydrodynamic response to analysis and verify the results, obtain the conclusion that the convex bottom shape buoy has the minimum added mass and the greatest power, and because of the damping force, the resonance buoy’s power is less than floating buoy.