Instrument For Measuring Infrared Management Properties Of Fabric Materials Based On Dynamic Interaction With Skin

With the continuous influx of advanced science and technology into the field of new materials and high-tech textiles,the global textile industry has entered a multi-functional and intelligent era.As a representative of functional textiles,the infrared functional textiles have been extensively studied and developed.But at present,the comprehensive testing technology and evaluation method for infrared radiation properties of textile materials at home and abroad are still not mature enough.Most of the test methods used are based on static and relatively single evaluation indexes.For the process from receiving infrared radiation to equilibrium state of fabric material,the dynamic and integrated test methods and systems have not yet been developed,More importantly,the dynamic interaction between skin and fabric has not been taken into account.Based on the summary of the overseas and domestic research status and the basic theory of infrared radiation,a mechanical testing instrument system and a bionic skin model were developed to simulate the dynamic interaction of infrared radiation between fabric and skin during the wearing of clothing,and a method was proposed to measure the infrared management characteristics of fabric materials under the dynamic interaction of skin by simultaneously testing the infrared intensity and temperature rise of the reflection and the transmission surfaces of fabric materials.A bionic skin model was built and a prototype system was developed to test the infrared reflection,transmission,absorption and emissivity of fabric materials under the dynamic interaction of incident infrared radiation and skin.That is,the infrared management characteristics of fabric materials to incident radiation were tested.The mechanical and electronic system of the bionic skin model was built based on the proposed test method,including the integral structure,the temperature control system and the sweating microcirculation system of the bionic skin model.The skin model can simulate the temperature control of human skin,and can realize three different sweating modes: non-sweating,perspiration and profuse sweating according to the different skin surface temperature.Based on the bionic skin model,a testing instrument system for the infrared management characteristics of fabric materials under dynamic interaction of skin was developed,including the design of the mechanical structure of the measuring system,the hardware construction of the data acquisition system and the development of the test control software based on LabVIEW.The integration of the testing instrument system and the skin model electromechanical system was realized to measure the infrared management characteristics of fabric materials under the dynamic interaction of skin.The fabric materials were tested by the developed testing instrument system.Derived from the obtained data,six evaluation indices were defined including the infrared emission intensity of the reflection surface,the infrared emission intensity of the transmission surface,the temperature rise of the reflection surface,the temperature rise of the transmission surface,the average infrared change rate of the reflection surface and the average infrared change rate of the transmission surface.In order to evaluate and determine the practical usability and precision of the testing instrument system,12 typical fabric materials were tested for capability and accuracy analysis.The capability analysis included the analysis of the accuracy/tolerance ratio(P/T Ratio)of the testing instrument system,the analysis of the mean value(X-bar)and the range(R-chart).The precision analysis included the analysis of the repeatability & reproducibility(R&R)and variance(ANOVA)of the testing instrument system.In addition,the intra-laboratory precision experiments and analysis were carried out for four typical materials,including the calculation of variance components and critical differences of the evaluation indices.The results show that the developed testing instrument system has acceptable capability and precision.A dynamic and comprehensive test method for infrared management characteristics of fabric materials under dynamic interaction of skin was proposed in this thesis.The developed testing instrument system integrated with bionic skin model has acceptable testing capability and precision,which provides a new test method for the production and quality control of the infrared functional textile materials.