Study On Hydraulic System Of Combined Heaving Buoy Wave Energy Convertor

This century, human began to put an eyes on the ocean. The ocean accounting two thirds of the earth’s surface area have enormous energy. Developing and utilizing the energy of ocean has become a hotspot and focus. Wave energy is famous for big reserves, wide distribution and variety advantages becoming one of promising energy.Heaving buoy wave energy convertor has strong applicability, high conversion rate and flexible configuration, becoming hot topics in energy research. The type of buoy select, support structure and the anchoring had been research, but have space in power take-off.In text, I research the power take-off that using hydraulic system transform the mechanical. To calculate the hydraulic reaction. The main contents are as follow:(1) Researching the pressure drop and the resistance of hydraulic rod through hydraulic component, we can get the expression of hydraulic resistance.(2) Analysis of the nonlinear term in float motion equation and hydraulic resistance expression, using the method of physical grid and 3D numerical simulate.(3) Aiming at the sea trail, analysis of numerical simulation and proposed the optimization strategies through the physical experiment.In article, there is a feedback relation between the hydraulic reaction and the movement of buoy, cannot be separated to researching, which the expression has a joint relations.Calculating the hydraulic resistance and substituting the equation of buoy motion solve the relationship between displacement and time. Through power take-off to solve the hydraulic force, which relate to the buoy velocity, acceleration, the power of motor output and the parameters of components. If ignore the moment of inertia, we can regardless the acceleration.Through simulation found that back buoy more flexible than front buoy no matter what have load. Indicates that the back buoy hydraulic reaction force and hydrodynamic change is relatively stable. In physical experiment found that the damping of hydraulic cylinder influence the motion and power.In article, the integrated using of theoretical analysis, numerical simulation and physical experiment, analysis of the combination heaving buoy wave energy convertor. Providing a reference in selecting hydraulic components, motor and electrical machine.