The Influence Of The Height Of Texture Surface On The Tactile Perception Of Skin

Tactile perception is the main perception method for human to distinguish external objects like auditory perception and visual perception.It is a concept that integrates mechanical perception,physiological perception,and psychological perception.Tactile perception has been gained increasing attention on account of its pervasive application in the fields of robotics,health care,aerospace,military,smart manufacturing,and automotive safety.Whereas,the mechanism of interaction between tactile perception and skin friction is remain unclear,and few studies have profoundly understood the mechanism of tactile perception from the aspects of human skin contact behavior and contact mechanism.Based on the methods of mechanical physics and psychophysics,the influence of the height of deterministic texture surface on the tactile perception of fingertip was analyzed by using the technique of event related potentials and tribological methods to explore the relationship between finger friction and tactile perception,and provides theoretical basis for practical application in the future.The main research work and conclusions are as follows.The influence of the applied load,the height of the texture on the frictional behavior of the fingertip skin and the artificial skin is explored by simulating the scene when a finger touches an object in daily life.The adhesion,the hysteresis and the interlock of the skin in the friction process are analyzed in detail.As well as their respective frictional forces at different texture height was determined.The test results showed that,with the same load,as the height of the sample texture gradually increases the fingertip skin is in contact with the sample,the friction force will gradually increase,and the adhesion friction force will become smaller and smaller as the height of the sample surface increases.The hysteresis friction force and the interlocking force directly related to the deformation will increase with the height of the sample.For man-made skin with less deformation,the adhesion friction dominates when the sample texture height is less than or equal to 0.3 mm,and the hysteresis friction force becomes more and more obvious.The cognitive potential P300 was induced by the commonly used oddball paradigm in psychophysics.A comparative analysis of the scalp ERP spatial potential distribution maps,latency and amplitude of the P3 component revealed that the sample texture height affects the human haptic perception.When the human finger rubs against samples of different texture heights,the P300 latency and amplitude in its ERPs are different.The latency of P300 induced by the sample with large texture features was small,the peak was large,and the perception was obvious;the samples with small texture features were the opposite.The existence of sample texture will affect the frictional behavior of the skin of human fingertips,and then affect the human body's tactile perception.The friction signal has a strong correlation with EEG signals.Frictional tactile perception mainly depends on the hysteresis friction(positive correlation with the size of the contact surface)and the interlocking effect(furrow friction and clinging action of the finger skin)caused by the skin deformation of the fingertips.The latency of P3 with large hysteresis was small,and the amplitude was large.