Endo Hiroshi
a Human Technology Research Institute , National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Japan.
Ergonomics. 2015;58(5):736-47. doi: 10.1080/00140139.2014.986222. Epub 2014 Dec 1.
This study examined whether manipulability during smartphone thumb-based touch operations could be predicted by the following robotic manipulability indices: the volume and direction of the 'manipulability ellipsoid' (MEd), both of which evaluate the influence of kinematics on manipulability. Limits of the thumb's range of motion were considered in the MEd to improve predictability. Thumb postures at 25 key target locations were measured in 16 subjects. Though there was no correlation between subjective evaluation and the volume of the MEd, high correlation was obtained when motion range limits were taken into account. These limits changed the size of the MEd and improved the accuracy of the manipulability evaluation. Movement directions associated with higher performance could also be predicted. In conclusion, robotic manipulability indices with motion range limits were considered to be useful measures for quantitatively evaluating human hand operations.
“可操作性椭球体”（MEd）的体积和方向，这两者均评估运动学对可操作性的影响。在MEd中考虑了拇指运动范围的限制，以提高预测性。在16名受试者中测量了25个关键目标位置处的拇指姿势。虽然主观评价与MEd的体积之间没有相关性，但在考虑运动范围限制时获得了高度相关性。这些限制改变了MEd的大小并提高了可操作性评估的准确性。还可以预测与更高性能相关的运动方向。总之，具有运动范围限制的机器人可操作性指标被认为是定量评估人类手部操作的有用方法。
