Research On Kinematics And Dynamics Of Wicker-type Wave Power Generation

Energy supports the development of the economy.In the environment where traditional fossil energy is gradually depleted,global energy is developing towards clean and low-carbon.As one of the most common and easiest renewable energy sources in marine energy,wave energy has been researched and achieved many results in many countries abroad since the last century.As China also has abundant marine resources,it has also entered the ranks of wave energy development by the beginning of this century.Under this environment,this article proposes a wicker-type wave power generation device,which combines the technical characteristics of the traditional oscillating float-type wave power generation device,and adopts a wicker-shaped structure to improve the conversion efficiency of wave energy and reduce manufacturing costs.Firstly,the global wave energy flow density is analyzed,and typical domestic and foreign wave power generation devices are introduced,which are classified and discussed based on the working principle.Based on this,a wicker-type wave power generation device is proposed,and then its overall structure,vibration system,hydraulic system,and key components are designed.A three-dimensional model is built using Solid Works software,and its working principle is discussed.Secondly,based on the airy wave theory and the Froude-Krylov hypothesis method,the vertical and horizontal wave forces on different shapes of floats and boxes are analyzed.Using MATLAB software to draw wave force diagrams for comparison and analysis,the shape of the float and the box can be determined,and the displacement of the float when subjected to wave force is calculated.Then,the vibration system is modeled and solved,and its amplitude-frequency response curve is analyzed.It can be seen that when the wave frequency and the natural frequency of the vibration system are within a similar range,the amplitude is the largest.And the amplitude in this range is greatly affected by the damping,so the parameters of the vibration system and the power generation of the device are designed.Based on ANSYS software,modal analysis and harmonious response analysis were performed on the vibration system.The natural frequency and amplitude frequency response are consistent with the theoretical value,which verifies the rationality of the vibration system design.Then,the static analysis was performed on key components to verify its mechanical properties.Finally,the kinematics analysis of the wave power generation device is performed using the analytical method to derive the kinematics equation of the hydraulic cylinder.Based on the matrix form of Lagrange's equation,the dynamic equation of wave power generation device is established,and the relationship between wave force and system kinetic energy is derived.The ADAMS software was used to carry out a simulation analysis of the wave power generation device,and the displacement,velocity and acceleration of the piston rod with time were obtained,as well as the force at the connection between the connecting rod and the sliding rod.