| Summary: | 碩士 === 華梵大學 === 工業工程與經營資訊學系碩士班 === 100 === Abstract
Objective: The this study used the psychophysical approach to examine handles position、handle angle and handling position on the bi-manual carrying task maximum acceptable weight.
Background: The musculoskeletal injury resulted in manual material handling (MMH) had been considered to be one of the major sources that caused damage in the industry. Confirmed by the previous study, container with handles is very important for enhancing the safety and efficiency of manual materials handling for people who use them. However, information regarding how the handle position and handle angle can affect two person carrying capacity is still insufficient.
Methodology: There were 16 participants recruited in this study (16males) and the participants were grouped according to those who match the height deviation ranged from ± 3 cm as two people in a group. And the total numbers of group was 8 (8groups of male). The experimental design adopted the Three-Factor Completely Randomized Blocking Design and the independent variables contains the location of the handle position(upper, middle, lower), the angles (0°, 15°, 30°)and handling position (Floor-Floor, Waist-Waist). The dependent variables included three types of bi-manual Maximum acceptable weight of carrying (MAWC), increment of heart rate (△HR), and the subjective Rating of Perceived Exertion (RPE).
Result: (1) the handle position had a significant effect on MAWC and fingers, shoulder RPE value; however, it had no significant effect on △HR, the MAWC (57. 45 kg) of the lower handle position was large and the fingers, shoulder -RPE (14.94 and 14.77) were the smallest; (2)The handle angle had a significant effect on MAWC and fingers, wrist, arm, back and whole body RPE value were smallest; it had no significant effect on △HR. The MAWC (55. 12 kg) of 30° handle angle was the largest and fingers, wrist, arm, back and whole body RPE were smallest; (3) the handling position had a significant effect on MAWC, △HR and RPE of the fingers, shoulder and whole body, the MAWC (57.45 kg) of the waist - waist handling position was the largest, floor-floor △HR is higher and fingers, shoulder and whole body RPE were highest; (4) the handle position and the handling position had a significant interaction for MAWC. For lower handle position and Waist-Waist handling position, MAWC was highest.
Conclusion: A lower handle position resulted in the greatest MAWC and the lowest level of fingers and shoulder-RPE; A 30° handle angle induced the largest number of MAWC and the lowest level of fingers, wrist, arm and whole body-RPE. A waist - waist handling position induced the largest number of MAWC and the lowest level of fingers, wrist, arm, shoulder and whole body-RPE. Therefore, the combination of the lower handle position ,with 30° handle angle and waist - waist handling position can produce the greatest bi-manual lowering capacity.
Application: This study made a suggestion for those who were in the process of bi-manual carrying tasks, to place handle position in the lower part by design. The angle was designed as 30° in addition to elevating the performance of tasks as well as reducing the burden of the operators.
Keywords: Manual Material Handling (MMH), bi-manual carrying task, maximal acceptable weight of carrying (MAWC), Psychophysical Method
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