| 研究生: |
朱証裕 Chu, Cheng-Yu |
|---|---|
| 論文名稱: |
發展一撓性仿人腕驅動器於親和人機互動 Development of a Compliant Humanoid Wrist Actuator for Human-Friendly Interaction |
| 指導教授: |
藍兆杰
Lan, Chao-Chieh |
| 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: | 2015 |
| 畢業學年度: | 103 |
| 語文別: | 中文 |
| 論文頁數: | 373 |
| 中文關鍵詞: | 仿人機械臂 、腕驅動器 、球面並聯機構 、撓性元件設計 、撓性機構 |
| 外文關鍵詞: | humanoid robot arm, wrist actuator, spherical parallel mechanism, compliant component design, compliant mechanism |
| 相關次數: | 點閱:90 下載:4 |
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本文發展一撓性仿人腕驅動器,設計目標除了有外形仿人與兩軸角位移範圍仿人等常見仿人目標,還加上總質量與體積仿人、兩軸角速度與扭矩仿人,以及串聯彈性致動。多項仿人目標使仿人腕驅動器不只能作出近於人類手腕的動作,還能執行負載較高,但仍為人類手腕作得來的工作。
腕驅動器質量仿人時,不會因重量過重,而占去太多的肩與肘驅動器負載。結合勁度已知的撓性元件與位移感測器,可感測腕驅動器的力量與位移;結合位移與力量分析,可控制腕驅動器的姿態與輸出扭矩;串聯撓性元件與致動器,可實現串聯彈性致動,以提供高準度的力量控制,確保腕驅動器與人類互動的親和性。
本設計由三個連桿機構組成,透過兩組含有致動器的撓性機構,將兩方向運動與力量傳遞至兩自由度球面並聯機構,再由球面機構的端效器輸出兩軸角位移與扭矩。連桿機構較容易輕量化;致動器遠離狹小的手腕空間而位於設計空間較大的前臂,故可採用尺寸較大(同時力量也較大)的規格;位於手腕空間的球面機構則因設計空間內無致動器,而可採用較厚實的桿件設計(同時提高強度)。所以本設計可在外形仿人與零件有足夠強度的同時,還能有仿人的輸出扭矩與機構重量,而後兩者為常見的關節驅動器難以同時達成之目標。
本設計不但適合在人類的日常生活環境中,執行人類手腕作得到的工作,或與人類互動。由於本設計額外具有質心位置仿人、轉動慣量與致動形式仿人之特性。因此,本撓性腕驅動器若用於仿人機械臂,其靜態與動態表現也相當接近人類手腕與前臂。
為了瞭解腕驅動器性能,並與人體數據比較、改善或選用較佳的機構設計方案、提供參考於姿態與力量控制,及確保撓性腕驅動器在高負荷下仍有足夠強度。本文對腕驅動器進行位移、速度、力量、撓性元件挫曲、端效器旋轉勁度、接頭力以及桿件應力分析,並加工出數個腕驅動器實體進行實驗與控制,期望本撓性腕驅動器能真正應用於相關領域中。
Base on the common location of actuators, and the requirement of humanoid appearance. In common humanoid robot arms, the output torques of wrist actuator are often much smaller than elbow and shoulder actuator. Compared to human wrist and forearm, the output torques and weight of humanoid wrist actuator are often much smaller and heavier, respectively. Therefore, we attempt to develop a compliant humanoid wrist actuator. Our goals not only contain humanoid appearance and rotational range in pitch (flexion- extension) and yaw (ulnar-radial deviation) direction, which are similar to common humanoid wrist actuators, but also contain humanoid mass, volume, angular velocity and torque in pitch and yaw direction. In addition, to achieve force sensing and to increase human safety, series elastic actuation is also one of our design goals. Therefore, our design can not only perform the high-loaded tasks in human wrist capability, but also improve the safety of interactive object (possibly human) and actuators.
By reviewing the literatures which are related to anthropometry (about wrist and forearm), the wrist actuator of humanoid robot arm and spherical parallel mechanism, we establish various design considerations, and improve or choose the better design from the feasible results. To establish design considerations, design compliant components, compare our design with human body, provide references for position and force control, and verify the strength of our design under the high-loaded tasks. We perform a series of analysis for displacement, velocity, force, compliant structure deflection, rotational stiffness, joint force, and structure stress. Finally, several prototypes of compliant humanoid wrist actuator are built for control and measurement experiments.
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