應用人體動作分析於數位人動作之產生

The Human Movement Analysis for Digital Human Motion Generation

10.6843/NTHU.2009.00769

張紹文

工作姿勢 ； 人體動作 ； 組裝作業 ； 數位人體模型 ； 工作現場評估 ； working posture ； assembly task ； digital human model ； ergonomic evaluation

清華大學工業工程與工程管理學系學位論文

2009年

博士

王茂駿

英文

工作現場的作業模擬已成為製造業在工作站設計階段所採用的主流技術。為了模擬生產現場中的人工作業，學界及產業界共同合作開發數位人體模型(Digital Human Model, DHM)技術，該技術也成為數位製造(Digital Manufacturing)領域中一個重要的模擬工具。而運用數位人技術時，由於人的動作機制相當複雜，要完整模擬作業時的各種動作遂十分困難。目前比較可行的方法是透過分析事前所收集的作業動作資訊，萃取出作業時的動作參數。將這些已儲存的參數匯入數位人動作產生軟體，可大幅提升動作模擬的真實性。 本研究中的動作分析實驗，其主要目的為透過實驗方法及動作捕捉(Motion Capture)技術收集組裝作業的關鍵動作資訊。本實驗包括八個受試者，自變項為出發位置(五水準) 、作業型態(三水準) 及作業高度(六水準)，而量測變項為作業時的全身姿勢、骨盆的位置及方向。藉著本實驗可得到人員從不同出發位置行走至作業目標時的最終位置及方向，以及在面對不同高度執行不同型態作業時的工作姿勢。 本研究的成果可分為三部分說明。首先，受試者在接近目標物時會優先考量行進時的效率，在有效率的前提下以一種兼顧舒適性的方式來執行作業。此外，透過本研究可得到受試者在六種高度執行三種不同類型作業時的工作姿勢。進一步深入分析，受試者在眼高、肩高、肘高及臀高作業時，採取站姿，而在膝高及踝高等較低高度作業時，主要採蹲姿或彎腰姿勢。本研究成果除了可做為數位人動作產生時的參考，同時也可用作工作姿勢及工作現場事前評估的重要依據。

Task simulation and workplace evaluation under the digital environment have been widely adopted at early production planning stages by large-scale manufacturing companies. In order to successfully simulate the manual operation, digital human model (DHM) was created as a simulation tool to help managements making better decision. However, the unpredictability and complexity of human movements increase the difficulty of creating an accurate and efficient simulation model for human movements. Herein, a feasible approach was proposed to enhance the simulation reliability by retrieving the working posture parameters from collected human motion data and inputting to the digital human motion generation system. The main purpose of this study was trying to gather critical information from workers in an assembly line by the means of the motion capture technology. An eight-subject experiment was designed to measure the pelvis orientation and position when approaching a working spot from five initial positions, and analyze the working posture while pointing a target, grasping a know, and pneumatic wrenching at six working heights. The results indicated that the position and orientation of the subject’s whole body (while performing the operation) were significantly affected by his or her approach direction. Linear relationships between the approach direction and the final whole-body orientation were also obtained for each of the three tasks. Based on the result, we inferred that the subjects would prioritize their work efficiency and would try to find a comfortable way to perform their jobs. They deviated from the least-distance (straight line) walking path and reoriented their whole bodies for the operation when approaching the working spot. In addition, the working postures for the three tasks at six working heights were analyzed, too. The subjects tended to adopt standing postures when working at a height between eyes and hip, and stooping or squatting postures when operating at a height between knee and ankle. The findings of this research can be used to enhance the digital human modeling motion generated for human movement simulation.

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