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研究生: 許正達
Hsu, Cheng-Da
論文名稱: 人形機器人視覺導引物件搬運之研究
A Study on Vision-Guided Material Handling by a Humanoid Robot
指導教授: 蔡清元
Tsay, T. I. James
學位類別: 碩士
Master
系所名稱: 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年: 2011
畢業學年度: 99
語文別: 中文
論文頁數: 81
中文關鍵詞: 人形機器人視覺導引協調之雙手臂倒傳遞類神經網路物件搬運
外文關鍵詞: humanoid robot, vision-guided, coordinated arms, back-propagation neural network, material handling
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  • 近十年來,機器人技術正由製造領域擴展至我們的日常生活,例如:人們非常期待機器人可於辦公室、家庭和醫院等日常生活環境中,協助人類。為滿足消費者的需求,近幾年來,已開發出各式各樣的服務用機器人;而人們對於多功能服務用機器人的需求已逐漸地增加。本實驗室去年建構了一個餵食用人形機器人,其主要是由一全方向輪式移動平台、一個架於輪式移動平台上的固定式身軀、兩個各七自由度的機械手臂、兩個機械手及一個安裝著全景式攝影機與二維旋轉攝影機之機械頭所組成。本論文之目的為提出一個視覺導引之控制策略,藉以賦予此一人形機器人以頭部之二維旋轉式攝影機導引協調之雙手臂搬運物件的能力。而所提出的控制策略則是基於倒傳遞類神經網路,此神經網路是用來獲得目標物之六個事先定義的影像特徵與其姿態之映射;經訓練完成後,機器人即可精確的定位出目標所在。對於物件搬運的工作,實驗結果顯示,機器人能以協調之雙手臂握持、運送與堆疊工件。

    In the recent decade, the robot technology is extending the activity from the manufacturing site to our daily life. For instance, robots that assist humans in daily environments such as in offices, homes and hospitals are highly desired. To fulfill these consumer demands, several service robots have been developed in recent years. Demand for multi-functional service robots is increasing. A feeding humanoid robot that was constructed to support those who are unable to eat independently comprises mainly an omni-directional wheeled base, a fixed torso mounted on the mobile base, two 7 D.O.F. robot arms, two robot hands and a head equipped with a panoramic camera and a pan/tilt camera. The objective of this thesis is to propose a vision-guided control strategy to equip the humanoid robot with the ability to handle the material by two coordinated arms with the pan/tilt camera of the robotic head. The proposed control strategy is based on the back-propagation neural network, which is utilized to attain the mapping between six predefined image features of a target and the pose of the target. After the training stage, the robot is capable of locating the target accurately. In the task of material handling, the experimental results reveal that the robot can drive its two coordinated arms to hold, transport and stack workpieces.

    中文摘要 i 英文摘要 ii 誌謝 iii 目錄 iv 圖目錄 vii 表目錄 x 符號說明 xi 第一章 緒論 1 1.1 前言 1 1.2 研究動機與目的 1 1.3 文獻回顧 1 1.4 本文架構 4 第二章 人形機器人之硬體介紹 5 2.1 人形機器人之機構 5 2.1.1 七自由度機械手臂之機構 6 2.1.2 機械手掌之機構 9 2.1.3 全方向輪式平台 11 2.2 機器人之感測元件 12 2.2.1 視覺系統 13 2.2.2 影像擷取卡 17 2.2.3 雷射測距儀 17 2.2.4 陀螺儀 18 2.3 機器人系統之硬體控制架構 19 第三章 機械人分析 21 3.1 全方向輪式底盤之運動學分析 21 3.2 機器手臂運動學分析 24 3.2.1 座標系統 24 3.2.2 機械手臂座標系統 25 3.2.3 機械手臂之順向運動學 30 3.2.4 機械手臂之逆向運動學 31 3.2.5 機械手臂速度運動學 35 3.3 機械手臂工作空間之軌跡規劃 41 3.3.1 空間中直線路徑 42 3.3.2 空間之方位 43 3.3.3 軌跡規劃 45 3.3.4 雙手臂抓取方塊之軌跡規劃 48 第四章 機器人頭手協調學習 51 4.1 影像處理 51 4.1.1 影像前處理 51 4.1.2 計算影像面積與重心 53 4.1.3 估測影像主軸 53 4.1.4 邊緣偵測 54 4.1.5 擷取角落特徵 55 4.2 類神經網路選取及架構 59 4.2.1 倒傳遞網路架構 59 4.2.2 訓練步驟 62 第五章 實驗 66 5.1 實驗設置 66 5.2 方塊之影像辨識 69 5.3 學習階段 70 5.3.1 參數設定 70 5.3.2 訓練步驟 71 5.3.3 訓練結果 71 5.4 機器人定位性能評估 74 5.5 機器人方塊堆疊測試 76 第六章 結論 78 6.1 總結 78 6.2 未來發展 78 參考文獻 79 自述 81

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