On Frictional Forces between the Finger and a Textured Surface during Active Touch
On Frictional Forces between the Finger and a Textured Surface during Active Touch
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DOI：
10.1109/toh.2015.2507583
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发表时间：
2016-04-01
影响因子：
2.9
通讯作者：
Visell, Yon
中科院分区：
文献类型：
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作者：
Janko, Marco;Primerano, Richard;Visell, Yon
我们研究了裸手指与纹理表面滑动接触时感受到的力，以及它们如何依赖于表面特性和接触相互作用。先前的研究已经揭示了触觉纹理感知。然而，纹理产生的力如何取决于触摸物体的属性或触摸方式还不太清楚。为了解决这个问题，我们设计了一种装置来精确测量滑动手指和纹理表面之间的接触力。我们制作了纹理表面，并测量了受试者用裸手指探索表面时产生的力的空间变化。我们分析了这些力信号的变化及其对物体几何形状和接触参数的依赖性。我们观察到许多非周期性信号分量形式的现象，包括瞬态粘滑行为、非线性、相位变化和大的力波动，事实证明这些现象很难对精细表面进行建模。此外，随着刺激空间尺度的增加，总谐波失真和归一化方差等指标也会减少。这项研究的结果表明，表面几何形状和接触参数不足以解释这种相互作用过程中力的产生。此外，结果揭示了触觉系统在表面纹理的主动触摸传感过程中解决的感知挑战。
We investigated forces felt by a bare finger in sliding contact with a textured surface, and how they depend on properties of the surface and contact interaction. Prior research has shed light on haptic texture perception. Nevertheless, how texture-produced forces depend on the properties of a touched object or the way that it is touched is less clear. To address this, we designed an apparatus to accurately measure contact forces between a sliding finger and a textured surface. We fabricated textured surfaces, and measured spatial variations in forces produced as subjects explored the surfaces with a bare finger. We analyzed variations in these force signals, and their dependence on object geometry and contact parameters. We observed a number of phenomena, including transient stick-slip behavior, nonlinearities, phase variations, and large force fluctuations, in the form of aperiodic signal components that proved difficult to model for fine surfaces. Moreover, metrics such as total harmonic distortion and normalized variance decreased as the spatial scale of the stimuli increased. The results of this study suggest that surface geometry and contact parameters are insufficient to account for force production during such interactions. Moreover, the results shed light on perceptual challenges solved by the haptic system during active touch sensing of surface texture.