Influence of Elastic Properties of Material on Tactile Perception

doi:10.3901/JME.2023.15.174

Abstract

Abstract: Elasticity is one of the important physical properties that affect the tactile perception of human. It is significant to systematically study the influences of elastic properties of material on tactile perception from finger friction to the brain response. The characteristic parameters are extracted from the friction, vibration, and event-related potentials (ERP) signals when finger touched different elastic surfaces. The relationship between surface elasticity and tactile characteristic parameters is established, and the tactile sensation of elastic surface is partially quantized. The results show that during touching rubber the friction force of finger is mainly hysteresis friction, while during touching ceramics and plastics the friction force of finger is formed by hysteresis friction and adhesive friction. The correlation analysis showed that the elastic modulus is negatively correlated with friction coefficient μ, the maximum amplitude of vibration signal A_max, the mean diagonal line length L, and the mean vertical line length TT of the recursive parameters of vibration signal, indicating that the smaller the elastic modulus is, the worse the stability and the higher the complexity of the vibration system are. The processing time of tactile perception in the brain is between 200 ms and 400 ms after the touching, and the brain regions activated by elastic are mainly the parietal and occipital lobes of the brain. The correlation analysis showed that the elastic modulus of the material is positively correlated with the peak value of P300, indicating that the lower the elastic modulus of the material is, the lower the excitability and attention of brain neurons are stimulated. The maximum amplitude of finger vibration signal is negatively correlated with the P300 peak value, indicating that the mechanical stimulation of tactile receptor is correlated with the cognition of brain. μ, A_max, L, TT, and P300 peak of tactile ERP signal are significantly correlated with elastic modulus of materials, and can be used as parameters to characterize the tactile elasticity of materials.

Key words: elastic modulus, friction, vibration, EEG, tactile perception

CLC Number:

TH117

TANG Wei, LI Cong, SHU Yunxiao, ZHU Hua, CHEN Si, PENG Yuxing. Influence of Elastic Properties of Material on Tactile Perception[J]. Journal of Mechanical Engineering, 2023, 59(15): 174-184.

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