The Mooring System Research Of Floating Hydraulic Wave Power Device

With the high-speed development of economy and society, the demand for mineral resources such coal, oil, natural gas continues to increase. But because of the unreasonable development and utilization of geological resources in almost two centuries, oil and gas of onshore and offshore is drying up, at the same time the earth’s environment has been destroyed seriously. So the exploitation of new energy is just around the corner. And due to the advantages of wide range, large reserves, no pollution, variety, the ocean energy is gradually taken seriously, more and more countries increased the investment of manpower and material resources for ocean energy development, so in current the exploitation of various types of ocean energy also gradually enter the mature stage, but how to make use of wave energy power efficiently is still a big problem. In a lot of research and development of wave energy power generation device, the mooring system of floating type wave power platform is not allowed to be ignored, because the appropriate mooring system can ensure it accurate positioning in the ocean, guarantee its normal work in various sea condition, reduce its development costs and improve efficiency at the same time. The topic is based on the basis of Floating Hydraulic Wave Power Device, make in-depth research on the mooring system mechanics characteristics of the device, the concrete work is as follows:First, research the design principle of wave power generation device and the sea condition of actual sea trial location, analyze liner wave theory. Based on the catenary theory, simplify the stress of mooring system, deduce the space configuration equation of cable line, use MATLAB to carry out the analysis of the mooring system mechanics characteristics, finally determine the anchor and anchor chain solutions of the device.Second, consider the inertia effect of mooring line and the fluid damping force, based on Completely Lagrange and cable structural unit which is simulated by two nodes isoparametric truss element under curve model, adopt the geometric nonlinear finite element method and Newmark method to establish the numerical model of dynamic analysis about the chain, get the actual stress, displacement, velocity, acceleration of each node in the chain, and use the model to analyze the influence of water depth, top of angle, excitation frequency on dynamic tension of mooring line.Last, establish the buoy type wave energy absorber, put forward the scheme about how to place a large number of devices in the sea. In the thesis, employ the triangular grid array layout, based on linear wave theory, get the frequency domain equations about three remarkable oscillation mode:surge, sway, heave and the instantaneous and average absorption power equations of the buoy. Obtain the data related to the frequency by using WAMIT procedure of SESAM. Analyze and compare differences about oscillation amplitudes and time-average power between inter-body moored, individually-moored and unmoored, and analyze the influence of different angles of wave incidence and bottom-mooring line angle on them, ultimately determine the optimal array layout.