Quantifying Digit Force Vector Coordination during Precision Pinch.
Quantifying Digit Force Vector Coordination during Precision Pinch.
复制标题
DOI：
10.1142/s0219519413500474
复制
发表时间：
2013-04-02
影响因子：
0.8
通讯作者：
Li ZM
中科院分区：
文献类型：
--
作者：
Marquardt TL;Li ZM
建立了一种方法来研究精确捏指过程中拇指和食指在指-物界面处的接触力学。将两个力/扭矩传感器集成到一个设备中，设计用于克服每个传感器的厚度，并为手指放置和施加力提供灵活的夹紧跨度。为了证明该设备的实用性，五名受试者完成了用拇指和食指捏髓的任务。手指间的力矢量协调通过检查1)力矢量分量大小，2)合力矢量大小，3)协调角-每个手指的合力矢量形成的角，4)方向角-每个矢量与坐标轴形成的角，以及5)压力中心位置来量化。结果表明，食指的合力大小比拇指大0.8±0.3 N，手指合力矢量的配合角为160.2±4.6°。实验装置和分析方法为灵巧操作过程中生物力学和运动控制的定量研究提供了有价值的工具。
A methodology was established to investigate the contact mechanics of the thumb and the index finger at the digit-object interface during precision pinch. Two force/torque transducers were incorporated into an apparatus designed to overcome the thickness of each transducer and provide a flexible pinch span for digit placement and force application. To demonstrate the utility of the device, five subjects completed a pinch task with the pulps of their thumb and index finger. Inter-digit force vector coordination was quantified by examining the 1) force vector component magnitudes, 2) resultant force vector magnitudes, 3) coordination angle – the angle formed by the resultant vectors of each digit, 4) direction angles – the angle formed by each vector and the coordinate axes, and 5) center of pressure locations. It was shown that the resultant force magnitude of the index finger exceeded that of the thumb by 0.8 ± 0.3 N and that the coordination angle between the digit resultant force vectors was 160.2 ± 4.6°. The experimental apparatus and analysis methods provide a valuable tool for the quantitative examination of biomechanics and motor control during dexterous manipulation.