Bionic sensor for testing dynamic friction of fabric

Abstract

The invention provides a bionic sensor for testing dynamic friction of fabric. The sensor consists of a friction head embedded with a PVDF film and a cantilever structure of a thin girder elastomer; and the cantilever structure is symmetrical according to the axes which are vertical with each other. The sensor comprises the PVDF film, an acrylic resin solidified body connecting rod, an acetate fiber film, vulcanized rubber, a vertical type strain girder, a horizontal type strain girder, a pedestal, a connecting girder and another connecting girder. The bionic sensor of the invention has simple structure, convenient mounting, large integrated rigidity, high inherent frequency and sensitivity of each direction of two-dimensional force, can be used for the friction test of fabric tactility evaluation and has rotary and reciprocating sliding flexibility.

Description

technical field [0001] The invention belongs to the field of mechanical testing technology and sensor application technology, and in particular relates to a multifunctional bionic sensor for testing skin / fabric dynamic friction, which can also be used for friction testing of force touch sensing. Background technique [0002] In the process of conducting basic research on the biomechanics of fabric tactility, especially the formation of adhesion and roughness, we need to test the dynamic friction behavior of fabric / skin under low load. The friction behavior between the fabric and the skin mainly involves two types of phenomena: one is the adhesion between the skin and the fabric, which is a tangential action parallel to the skin surface, which is detected by the skin pulling sensitive tactile receptors; the other is the adhesion between the fabric and the skin. Vibrations during contact and sliding caused by surface irregularities are detected by vibratory tactile receptors w...

AI Technical Summary

Problems solved by technology

This kind of sensor can carry out micro-friction test in various contact modes, and guarantee a certain test accuracy and resolution. Its disadvantage is that the overall stiffness of the elastic body is small and easy to deform; the natural frequency is low, which is not conducive to dynamic testing.

Chinese Patent Publication No. 200510094990.0 "Two-dimensional small-range force sensor", the elastic body cantilever adopts a double-hole parallel beam structure, the overall stiffness is not high, and the requirements for digging holes limit the cross-sectional size and overall quality of the cantilever beam, so that it is comparable to the same range Compared with the cantilever beam, the natural frequency is lower, and the natural frequency affects the accuracy of the measurement and limits the dynamic range of the force to be measured

In the literature "Research on the Force Sensor of Micro-Friction Tester" [Li Haiwen, Jia Hongguang, Wu Yihui. Precision Engineering, 2002, 10(4): 388-391], a sensor for friction between micro-mechanical samples is proposed. The elastic body of the sensor is designed as a silicon beam with cantilever beam film and strain gauge resistance. The elastic body structure determines its small measurement range and complicated processing technology; in "Two-dimensional force sensor for friction coefficient test" [Shi Yan, internal combustion Locomotive, 2002, 336 (2): 41-43], this sensor adopts a right-angle combined sensor, the beam for testing positive pressure is a shear bridge type, and the vertical beam for testing friction is a double-hole parallel beam type, which is only suitable for relatively Large range of force measurement, and it is not convenient to carry the friction slider

Moreover, the existing disclosed friction sensors do not specifically address the skin / fabric contact, adhesion and vibration phenomena during sliding, so that the test results cannot accurately characterize the fabric tactility

Therefore, the above-mentioned types of sensors do not meet the requirements of skin / fabric friction experiments in terms of structure, stiffness, natural frequency, sensitivity, measurement range and characteristic variables.

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