裝載前後浮力引擎水下滑翔機之設計與製造

Design and construction of an Underwater Glider with Fore and Aft Buoyancy Engines

董瑞閔(Jui-Min Tung)

指導教授 ： 郭振華

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.00016

摘要

本文探討之主題為裝載前後浮力引擎水下滑翔機之節能設計問題。浮力引擎是以吸排水改變重浮差之機構。活塞式浮力引擎放置於機身的兩端，故亦可改變滑翔機之重心位置。本文推導包含重力、浮力、流體力之水下滑翔機力平衡方程式。浮力引擎的耗能可以總吸排水變化量估算，本文提出以節能為前題的浮力引擎操控限制，遵循此限制，則裝載前後浮力引擎較藉由移動重心及一個浮力引擎之水下滑翔機省能。本文最後提出最省能之滑翔姿態、速度、翼尺寸及位置之計算方法。

關鍵字

水下滑翔機 ； 浮力引擎 ； 浮力驅動 ； 水下載具 ； 海洋觀測

並列摘要

This work investigate a novel design of underwater gliders with fore and aft buoyancy engines. The advantages of using a glider for ocean observations are that gliders have low energy cost for long endurance. A buoyancy engine is a device which changes buoyancy of an underwater vehicle by attracting and expelling water. Underwater gliders equipped with buoyancy engines can be driven by net buoyancy forces. The buoyancy engines’ arrangement considered in this study contains two tanks located at the fore and end aft part of the hull. Buoyancy engines considered here are those of piston-type. Forces equations which model buoyancy, gravity, and hydrodynamic forces in gliding are derived. Performances of different sizes of buoyancy engines are compared. Energy for driving a glider with fore and aft buoyancy engines could be estimated by total volume change of buoyancy engines and the cost for holding piston position during transferring. The net buoyancy and position of the center of gravity can be tuned at mean time using the fore and aft buoyancy engines. Operational constrains for gliders using fore and aft buoyancy engines are specified. Following these constrains, energy cost for glider motion will be lower than conventional glider design using single buoyancy and a weight shifting device. This study describes a design methodology for specifying volume capacity of buoyancy engines. Glide angles and glide speeds for optimal energy cost are also specified base on the minimal energy cost. Gliders with rectangular wings of various shape and wing location are then examined in terms of the energy cost for gliding controlled by buoyancy engines.

並列關鍵字

underwater gliders ； buoyancy engines ； buoyancy driven ； underwater vehicles ； ocean observation

參考文獻

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