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Effect of object and human-factor characteristics on the preference of thumb-index finger grasp type
Ergonomics ( IF 2.4 ) Pub Date : 2020-06-30 , DOI: 10.1080/00140139.2020.1782997
Xiaojing Chen 1, 2 , Zhiguo Li 1, 3 , Yuqing Wang 2
Affiliation  

Abstract This work is to investigate the factors affecting the preference of human thumb-index finger grasping type. A multinomial logistic regression analysis shown that the object characteristics (equivalent diameter and shape) and human-factor characteristics (hand-used, finger-length sum and finger-length ratio) had significant contributions on the preference of thumb-index finger grasp type (p < 0.05) but the gender had not (p > 0.05). Subsequently, two mathematical equations were proposed for predicting the probability at which the precision-pinch and power-grasp were chosen for grasping an object. The probability at which the precision-pinch was chosen gradually decreased with the increase in the equivalent diameter of objects, but it is opposite for the power-grasp case. The shorter the finger-length sum, the more likely the participant was to select the power-grasp for grasping an object compared to the precision-pinch. The power-grasp was the most frequently chosen for the finger-length ratios of 1.0–1.25 and 1.75–2.0. Practitioner summary: This fruitful study gave explanation of the relationship between the object and human-factor characteristics and the preference of human thumb-index finger grasp type, which would be helpful to make intelligent grasping planning strategies for two-finger bionic mechanical hands.

中文翻译:

物体和人为因素特征对拇指-食指抓握类型偏好的影响

摘要 本研究旨在探讨影响人类拇指-食指抓握类型偏好的因素。多项逻辑回归分析表明,物体特征(等效直径和形状)和人因特征(手使用、手指长度总和和手指长度比)对拇指-食指抓握类型的偏好有显着贡献。 p < 0.05)但性别没有(p > 0.05)。随后,提出了两个数学方程来预测选择精确捏合和强力抓握来抓取物体的概率。随着物体等效直径的增加,选择精确夹点的概率逐渐降低,而动力抓取的情况则相反。手指长度总和越短,与精确捏相比,参与者更有可能选择强力抓握来抓住物体。对于 1.0-1.25 和 1.75-2.0 的手指长度比,最常选择强力抓握。实践者总结:这项富有成果的研究解释了物体与人为因素特征的关系以及人类拇指-食指抓取类型的偏好,有助于制定双指仿生机械手的智能抓取规划策略。
更新日期:2020-06-30
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