Research On The Perspiring Performance Of Simulative Skin

Clothing is one of indispensable factors for our daily life.Clothing comfort and fit is a target that human always go in for.Clothing comfort includes thermal physiological comfort and non-physiological comfort.Among them, clothing thermal comfort is a primary one.The major indicators which influence clothing thermal physiological comfort are thermal insulation and evaporative resistance. The instrument which measures the performance of textile heat-moisture transfer and perspiring manikin are vital tools to evaluate clothing thermal comfort and moisture comfort. Simulative skin is used to simulate the characteristics of human perspiration.lt is an important component of these two instruments. The performance of simulative skin influences that these two instruments measure evaporative resistance, but, so far, there is little research on the perspiring performance of simulative skin. This research aims to provide better theoretical foundation for the designers and experimental researchers who study on or make use of perspiring manikin or textile micro-climate instrument.This thesis involves the knowledge areas such as electronics (integrate circuit control), electrotechnics, mechanics, PID control theory, LabVIEW program theory, SPSS statistical analysis and mathematical analysis methods and moisture transfer in micro-porous membrane fabric and so on.A novel instrument for the evaluation of simulative skin was developed based on simulating sweat equipment, advanced Virtual Instrument frame (the hardware including Data Acquiration Card, signal conditioning card and Solid State Delay etc.) and LabVIEW software system in this thesis.The device has the following major functions:(1) It's the first time to measure perspiring transmission rate in the condition of different pressure and different temperature and calculate evaporative resistance of simulative skin.(2) Simulate human skin temperature. Automatic PID control is adopted and the control range is from lab temperature to 50℃within a small acceptable error range,±0.5℃.(3 ) The multi-channel control simultaneously system was developed by Virtual Instrument. Control the data acquisition device to aquire the temperature, relative humidity and output power reading. Record all the measurement data and autosave in the form of excel spreadsheet.(4) The testing interface is simple and friendly and the operation is easy.In the process of experiment, the rich acquisition data was displayed in real-time.(5) According to the experimental results, the instrument's work is stable, the control is reliable and the effect is perfect.Several kinds of different skin temperature were simulated and perspiring quality and perspiring transmission rate of three different simulative skins were measured in the different pressure. The evaporative resistance of three simulative skins was calculated. The main experimental conclusions of this paper are as following (the other detailed conclusion to see chapter 5):(1) Perspiring transmission rate of simulative skin descreased with the pressure's fall and increased with the temperature's rise. (2) The micro-porous membrane of the different structure parameter plays an important role in the perspiration transmission rate of simulative skin.(3) The perspiration transmission rate of three-laminated micro-porous fabric is much smaller than two-layer one's when using the same micro-porous membrane because three-laminated fabric is added more bond in the course of production.The bond jamms micro-porous, thus the aperture minishes and diffusion resistance ascends. Finally, the perspiration transmission rate descends.In conclusion, a new instrument for the evaluation of the performance of perspiring skin has been designed and developed in this paper. The perspiring performance of simulative skin was made a further study in the condition of different temperature and different pressure and the curve regressive models of different perspiring skin were established by SPSS software. The instrument for the evaluation of the performance of sweating skin and the flexible temperature control system developed in this paper provided a feasible research method for the following researchers. This thesis provided a continuable research tool and study method through designing and developing a new instrument for the evaluation of the performance of perspiring skin. It is beneficial for the following researcher to have a further explore to clothing thermal-moisture comfort.