Analysis Of Operation Principle Of Wave Glider And Research Of Structural Design For Underwater Glider

Wave-power Underwater Glider is a new type of autonomous observation platform, it consists of surface float and underwater glider, which are connected by tether. It takes use of the characteristic that the water particles underwater have smaller radius, the tether sends the ups and downs of the wave which can be collected by float to underwater glider, and the wings on glider move with Angle of attack underwater, then it can generate forward thrust. In this way, it converts the movement of the wave directly to forward thrust and then implements long-duration missions without additional power supply, by carrying a variety of sensors, it can achieve different observation capabilities. It has much significance in many aspects such as resource detecting, environment surveillance, military scout. Main research achievements follow:(a) Basing on existing research, this paper analyze the operation principle of Wave-power Underwater Glider, respectively takes force analysis of flat and non-flat hydrofoil, and take out a calculation method of the force on hydrofoil based on lift and drag coefficients.(b) Go through the simulation between flat hydrofoil and NACA 4 digit hydrofoil by CFD (Computational Fluid Dynamics) software, ANSYS CFX, and make choice by comparing the performances between each other in different velocity. By the simulation of NACA 0012 hydrofoil in varied angle of attack and velocity, express the numerical relationship between lift and drag coefficients of the hydrofoil. Analyze the influence the distance of the hydrofoils has on the hydrodynamic performance, and make a choice.(c) Based on the theoretical analysis, make the structural design of underwater glider, including the main frame design, hydrofoil design, fairing design, additional component connecting design and so on.(d) Analyze the stability of the whole structure, ensure the stability and anti-disturbance ability. By comparing the theoretical trajectory and the experimental trajectory of the float when the wavelength is relatively short, puts forward the design requirement of the maximum length of the float.(e) Makes launching test underwater of the glider, validate the theoretical model and analyze the causes of the differences between theoretical data and the experimental data, put forward the factors that have effects on thrust, and provide reference for optimization of the structural design.