Research On Improving The Wave Energy Acquisition Efficiency Of Buoy-Rope-Drum Device By Phase Control

The wave energy device of oscillating floater is a complete and damped forced vibration system with seawater and wave.The wave is the excitation source,floating body is vibrator and the system collects wave energy in the way of internal damping.Therefore,resonance technology and phase control technology are the two common means to improve the collection efficiency of the wave energy device of oscillating floater at present.The wave energy device with floating body pulley is a typical oscillating float wave energy device.The previous physical model experiments and simulation experiments show that resonance technology is difficult to effectively improve the collection efficiency of wave energy device with floating body pulley.Therefore,this thesis intends to research the feasibility of phase control technology to improve the collection efficiency of wave energy device with floating body pulley.The main research work of this thesis is as follows:(1)Research on the basic theory of wave energy acquisition of floating body pulley.According to the sea parameters of the subsequent real sea state test and the size of the sea trial prototype,the linear wave theory of limited water depth is selected,and the power calculation formula of the regular wave of limited water depth on the width of wave energy device is derived.By comparing the relative relationship between the size of the floating body and the wavelength,the Morrison formula is selected to calculate the wave load on the floating body.(2)The establishment of phase control experiment platform for physical model of wave energy device with floating body and pulley.Based on the idea of equivalent external placement of pulley mechanism and the model of wave energy device of floating body pulley is established,The hardware design of phase control system is completed based on PLC control and electromagnetic brake,The software and hardware structure design of data acquisition system is completed based on data acquisition card and Lab VIEW language,and the calculation method of first level average wave energy acquisition efficiency of physical model of floating body pulley wave energy device is deduced.(3)Experimental study on phase control of physical model of wave energy device with floating body pulley.Taking the maximum first-order average wave energy acquisition efficiency as the optimization objective,the wave energy device models with or without phase control function are optimized respectively.By calculating and comparing the optimal first-order wave energy acquisition efficiency of the two models under the same wave condition,the feasibility of improving the acquisition efficiency of the floating body belt wheel wave energy installation model by phase control is proved.(4)Research on the simulation technology of wave energy device with phase control function.Aqwa's frequency domain analysis function is used to calculate the hydrodynamic coefficient of the wave energy device of the floating body with wheels,and then orcaflex is introduced to complete the hydrodynamic simulation of the wave energy device.The phase control simulation of the wave energy device of the floating body with wheels is realized by the winch module of orcaflex,and the calculation method of the first-order average wave energy collection efficiency based on the simulation data is derived.The two wave energy device models with or without phase control function are compared by calculation under the same sea condition It is proved that the phase control technology is feasible to improve the acquisition efficiency of the floating body belt wheel wave energy prototype.