臺灣博碩士論文加值系統

本研究設計一個具有雙旋轉自由度，能獵取浮標橫搖、俯仰、起浮運動動能之獵能器，並透過呼拉圈運動增加獵能器與波浪運動運動耦合，達到更佳的獵能效率，發電方式使用電磁感應發電，在磁路方面使用能增強線圈側磁力之海爾貝克陣列(Halbach array)磁鐵排列方式，和增加獵能器表面磁通量密度分布使用二維海爾貝克陣列磁鐵排列方式，目標解決長期放置海上觀測浮標之電池壽命問題，延長觀測浮標之使用壽命。
本研究從使用無線慣性感測元件量測投入高雄西子灣浮標之橫搖、俯仰角度和起伏高度、波浪頻率，代入透過拉格朗日方程式(Lagrange equation)推導出獵能器動態方程式，並根據運動方程式模擬結果，調整獵能器適當之配重使獵能器產生呼拉圈運動，提高發電量。透過模擬獵能器之表面磁通量密度，計算線圈之感應電動勢，再求得電磁阻尼，帶入動態方程式中，使動態方程式更趨於完備。
從模擬結果中顯示調整配重塊位置能使浮標與獵能器有更佳的動態耦合，產生雙軸呼拉圈運動，並提升獵能器轉動之平均角速度，從結果中顯示雙軸呼拉圈運動相對震盪運動能大幅提升33倍的輸出能量，使本文所設計之獵能器重量約4Kg，達到輸出18.39 W之功率。

This study developed a 2-DOF energy harvester that composes of an eccentric sphere and a novel circular Halbach-array magnetic sphere to harvest wave energy from the motion of a floating buoy in three directions, i.e. rolling, pitching and heaving motion. The eccentric sphere with adequate parameters revolving in hula-hoop motion enhances the power generation because its angular velocity is higher than revolving in small-amplitude oscillation. Faraday’s law of induction is adopted to transform the kinetic energy to electrical one. The two-dimensional Halbach array arrangement augments the gradient of the magnetic flux density of the side on which the coils were located. The goal of this study to achieve self-power buoy to avoid battery changed.
A wireless inertial measurement unit was used to measure the kinematic behavior of the buoy placed in Sizih Bay, Kaohsiung. The dynamic equations of the eccentric sphere mounted on the buoy were derived using Lagrange method.. The magnetic flux density and electromagnetic damping of the Halbach-array magnetic sphere were evaluated using magnetic field strength simulation and Faraday''s law of induction. The eccentric sphere with adequate weighting conditions possesses well dynamic coupling ability to provide the hula-hoop motion. According to the simulation results, the power of the adequate weighting eccentric sphere in hula-hoop motion is approximately 18.39W that was 33 times higher than revolving in small-amplitude oscillation.

論文審定書 i
論文公開授權書 ii
致謝 iii
摘要 iv
ABSTRACT v
目錄 vii
圖次 x
表次 xiv
符號說明 xv
第一章 緒論 19
1.1 前言 19
1.2 文獻回顧 19
1.2.1 海上發電方式介紹 20
1.2.2 海上獵能系統 21
1.3 研究動機 26
1.4 本文架構 26
第二章 獵能器數學模型建立及推導 27
2.1 浮標運動行為及量測 27
2.1.1 浮標六個自由度運動 27
2.1.2 浮標運動行為量測 28
2.1.3 浮標穩定度計算 34
2.2 獵能器動態模型建立 37
2.3 獵能器動態行為模擬 46
第三章 磁路設計及結構應力分析 61
3.1 獵能器磁路分析 61
3.1.1 多極化陣列磁鐵排列與海爾貝克陣列磁鐵排列磁力比較 61
3.1.2 一維與二維海爾貝克陣列磁鐵排列磁力比較 63
3.1.3 導磁底板對磁力之影響 66
3.2 發電原理 68
3.2.1 表面磁通量密度公式推導 68
3.2.2 電磁感應式獵能器發電原理 71
3.3 獵能器機構設計及應力分析 74
3.3.1 獵能器機構設計 74
3.3.2 應力分析 75
第四章 獵能器模擬結果 77
4.1 獵能器模型製作 77
4.1.1 磁鐵製作 78
4.1.2 極化磁鐵球球殼 79
4.1.3 極化磁鐵球上、下蓋 79
4.1.4 極化磁鐵球旋轉支撐環 80
4.1.5 配重塊結構、配重塊 80
4.1.6 軸承 81
4.1.7 線圈支撐架 81
4.1.8 線圈 81
4.2 獵能器模擬動能 82
第五章 獵能器製作與實驗結果 88
5.1 獵能器製作 88
5.2 獵能器發電量量測與功率 89
第六章 結論與未來展望 92
6.1 結論 92
6.2 未來展望 93
參考文獻 94

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