| With the continuous progress of society and people's pursuit of a higher quality of life,the comfort of clothing has become one of the primary considerations for consumers to purchase clothing.Thermal comfort is an extremely important part of wearing comfort,and it has always been the research focus of researchers.In terms of the thermal and moisture comfort evaluation of fabrics or clothing,sweating mannequins are relatively ideal equipment among various testing instruments,but their systems are complex and large,costly,and require high test conditions and are not easy to carry.Therefore,this paper designs a simple cylindrical fabric thermal and moisture resistance tester on the basis of referring to the testing principle of the sweating warm body manikin,and uses simulation technology to optimize it.The specific research content is as follows:(1)The design of the cylindrical fabric thermal and moisture resistance tester is divided into four major modules,namely the sweat cylinder,the water supply and water circulation system,the temperature control system and the data monitoring system.The sweat cylinder is the test body of the entire instrument.The inside of the cylinder is a constant temperature water bath,and the metal outer cylinder is wrapped with a waterproof and moisture permeable fabric as a simulated skin to realize the sweating function of the cylinder.The water supply and water circulation system mainly realizes the automatic water replenishment function during the test.Using the principle of the connector,when the water evaporates from the test surface,the water level inside the cylinder drops,and the water inside the water supply bottle is automatically replenished to the cylinder under the action of atmospheric pressure.And can get the evaporate loss through the drop of the water level in the water supply bottle.The temperature control system uses PID control principles to control the temperature of the water bath in the cylinder so that it can be maintained at the set temperature.The data monitoring system uses power detectors and temperature and humidity sensors to display power,temperature,and relative humidity in real time for the calculation of thermal resistance and humidity resistance.(2)After completing the design of each module of the cylindrical fabric thermal and moisture resistance tester,a numerical model of the sweat cylinder was established using simulation technology.The basic steps include proposing hypotheses and simplifying geometric models,constructing control equations and definite solutions Conditions,meshing and calculations.Based on the establishment of a numerical model,the parameters or structure of the cylinder were modified,and the influence of the heating structure in the cylinder,the material of the outer cylinder and the size of the aperture was discussed,and the optimal design of the cylinder before processing was realized.(3)The processed cylindrical fabric thermal and moisture resistance tester was used for testing,and its stability was tested according to the experimental data;and the existing equipment YG606 E textile thermal resistance tester and YG601 H computerized fabric moisture permeability tester were used to test the thermal resistance and moisture resistance.Values were compared and analyzed.The final result shows that the test results of the cylindrical fabric thermal and moisture resistance tester have a good correlation with the thermal and moisture resistance values tested by the above two instruments,indicating that the cylindrical fabric thermal and moisture resistance tester can accurately compare each fabric The difference in thermal and moisture performance between.(4)After verifying the stability of the test results of the cylindrical fabric thermal and moisture resistance tester,the test results are used as the fabric parameters of the numerical model to determine the heat and moisture transfer performance of the fabric under different air layer thicknesses and different environmental conditions.Carried out predictive analysis.The results show that the greater the thickness of the air layer within a certain range,the higher the temperature at the simulated skin.Under different ambient temperatures,the higher the ambient temperature,the greater the impact on the temperature and relative humidity in the air layer;and the environment The change of relative humidity has little effect on the temperature in the air layer,but it will prolong the time for the relative humidity in the air layer to reach equilibrium and increase the relative humidity distribution gradient in the entire air layer. |
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