纤维材料属性与接触摩擦振动信号结构之间的关系

Relationship between textile fibers and friction-induced vibration signals

采用振动反馈刺激方式再现织物的触觉质感时,找到体现物体特性并符合触觉感受器生理属性的振动刺激是一个必要条件。针对此问题,探索反映纤维类型的皮肤摩擦振动信息特征。通过设计一组结构参数相同而纤维类型不同的机织物,以三轴向加速度传感器记录手指滑过这些样品表面时产生的振动信号。采用快速傅立叶变换技术对振动信号进行频谱分析,并以皮肤触觉感受器的频域刺激响应特性为依据提取频域内的特征信号。经分析发现,幅频特征不能用于分辨不同材料的机织物,基波的特征部分体现了机织物的结构参数,但前3次谐波功率强度的加权值在天然纤维素纤维和合成纤维之间具有显著差异。

To realistically reproduce the tactile qualities of the fabric by the vibration feedback interface, it is a prerequisite for the identification of the vibration signals representing the object properties as well as the neurophysiological properties of cutaneous mechanoreceptors within human fingertip. Thus, a series of simple woven fabrics are designed by same structure but changing the fiber types, and the friction-induced vibration signals, where human fingertip slides across the fabric surface at a constant velocity, are record by a tri-axial accelerators. The measured vibration signals are analyzed by a Fast Fourier Transformation （FFT） technique, and the features in frequency are extracted on the base of the frequency responses of cutaneous mechanoreceptors. The result shows that the fabrics made of different fibers cannot be identified by the amplitude-frequency features, and the waveform features of the fundamental wave consisted of the vibration signals represent to some degree the structure parameters of a simple woven fabric. However, the weighted vibration powers of the three harmonic waves basically differ in the fabrics made of natural fibers and synthetic fibers.