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Clothing hot wet performance test system - sweating warm body fake

Under cool and cold climatic conditions, the human body mainly maintains thermal balance inside and outside the body by convection, conduction, and radiation. At this time, the cold and warmth performance of the costume is the main factor in maintaining the balance of human body; while in the hot summer, when an external environment When the temperature is equal to the surface temperature of the human body, even higher than the human surface temperature, the only heat dissipation pathway is evaporated by sweating. At this time, the moisture permeability of the apparel is the decisive factor in maintaining human thermal balance in the hot environment.
The thermal transfer of the research person and the environment is the advanced technology that has been adopted by many countries. The advantages are highly accurate, repetitive, and can carry out clothing comfortable performance under extreme environmental conditions that are unable to experiment. Test test. Currently, the dummy that has been developed and used in clothing comfortable performance has a warmers and sweating fake people. Thermal dummy can only simulate the thermophysis response of the human body in the non-evaporated heat dissipation range, for testing and evaluating the warmth of clothing in a cold environment, and for evaporation, only by sweating Dummy simulates the human body - clothing - the hot humid exchange between the environment can test and evaluate the thermal wet transmission performance of clothing in the hot environment and wearing hot wet comfort, therefore, the sweating dummy has become a research hotspot in the field of clothing works. . Foreign foreign countries began researching sweating in 1988. Currently, the units that successfully develop the vacant wakes have mainly include the Finnish Technology Research Center and Japan Tokyo Cultural Women's University. The common feature of these two sweating wakes is to simulate the human body. The state of gaseous sweat can only be tested in the cooling performance of occupational protective clothing in a cold environment or a comfortable environment [1].
1 Sweating Doors System Composition
1. Extension of the Executive Town
The Executive Town System mainly includes the dummy's body, the interface circuit, the fake human thermal control device, the fake person sweating Control devices and application software five, structural block diagrams are shown in Figure 1. The sweating dummy's body is based on the three-dimensional size data of Chinese male soldiers. It uses digital human model to rapid development technology route to develop dummy models; with a platinum resistance temperature sensor and multi-channel DC program control power supply into a dummy thermal control system, implementation The detection of the dummy surface temperature and the fake person heating and regulation; the precision creep pump and high precision weighing mechanism constitute a dummy sweating control system, simulating the human body in different test modes; design language in Visual Basic modular programming language Platform creates a sweat in the control and management system software to achieve a variety of signal real-time detection and the hot humidity regulation of the dummy.
1.2 sweating and perspiration manikin mechanism housing structure
based on real test data and literature hot environment information [2], while in a sitting position in a quiet thermal environment, the stable temperature of human skin ~ 32.3 35.5 ℃, body sweat amount of about 60 ~ 200m
L (/ m · 2 h) (body surface area 1.7m2), average skin when the bodyWhen the temperature was 35 ° C, the core temperature was 38 ° C, the maximum sweat of the body was about 400 mL (/ m2 · h). According to this, the sweating dummy stabilizes the skin temperature set to 34 ° C, and the sweating level is controlled at 60 to 400 ml (/ m2 · h). According to the sweatological test system stabilizes the level of skin temperature and simulating the sweating level, several asymmetric hydrophilic polytetrafluoroethylene laminates are selected for sweating test test, and finally selected from 100% cotton fabric as a human skin. Inner layer, asymmetrical hydrophilic polytetrafluoroethylene film as a human skin outside, ensuring rapid absorption and diffusion of moisture, and simultaneous liquid sweat and gaseous sweat function; with different sweatons, single peat gland wet area Without the law of change, it was determined that the ellipse of 80 cm2 was a design principle of a sweating hole wet area, and 160 sweat units were placed on the surface. As shown in Figure 2, the fake person has an 8-layer structure from the inside to the outside, and after 2 to 6 layers reaches the inner layer of the artificial skin, it is rapidly absorbed and diffused. This study selected asymmetric hydrophilic polytetrafluoride film is a very thin high molecular polymer film, which distributes a large number of micropores having a large diameter of 0.3 to 1.5 μm, and since the diameter of the water vapor molecule is generally 0.000. 4 μm, the diameter of the light mist is generally 20 ~ 100 μm, so the non-symmetric hydrophilic polytetrafluoroethylene film microporous diameter is much larger than the water vapor molecule, and the diameter of the light mist and the water molecule is usually simulated. When the water vapor can be smoothly transmitted through the film, and the water droplets are bonded in the holes and are fixed by surface tension. When simulating the human body, by regulating the pressure of the sweating pump to destroy the surface of the water droplets, liquid water droplets The hole can simulate the human body liquid sweat because the film is asymmetric hydrophilic. The sweating dummy has 8 layers of composite structures, and the new hydrophilic polytetrafluoroethylene laminate is selected as the simulated skin, and the integrated design of the sweating of the vacuum, the temperature-control circuit and the sweating line is also used. There is a double function of liquid sweat and gaseous sweat. thermal manikin 2 The basic principles and main features of the sweating dummy system
According to the human physiological theory, the human body and the outside environment are exchanged by non-evaporated heat (conduction, convection, radiation) and evaporation heat dissipation. The basic principle of the sweating dummy test system is to place the sweating false person in the artificial climate warehouse, and the dummy's skin temperature control model and sweating control model regulate the dummy skin temperature and sweating amount through thermal control and out The sweat is stable at a certain level, so that the fake person-clothing-environment is in a dynamic hot humidity, at which time the surface temperature, the ambient temperature, the dummy, etc., can be used, Get an indicator of the thermal resistance, wet resistance and moisturectity index of clothing, and evaluate the thermal wet transmission performance of clothing.
The human body is a complex huge system, and the sweating dummy can only be based on testing and evaluation of clothing.Thermal wet transmission performance, starting from the principle of ergonomics, combined with the theory of physiology, clothing comfort science, etc., as far as possible to simulate the hot and humid transfer process of the garment system, we will sweat the vacation
Test system has the following characteristics: [ 123] a. Simulated heat from the surface of the human skin to the environment to the environment.
b. The dummy body is in line with the characteristics of human anatomy.
c. Divide people are divided into 12 independent heating control segments, and shoulders, sip, and ankle.
d. Dummy skin surface temperature and sweating rate are controlled by computer.
3 Sweating Dummy Test Mode and Evaluation Index
In order to effectively test and evaluate the moisture permeability and breathable performance of different clothing, better research services, based on scientific research services The work needs, three kinds of test modes of sweating fake people, namely constant temperature and constant humidity test mode, constant temperature sweating rate test mode and simulated real person test mode.
3.1 Constant temperature constant moisturizing test mode
The constant temperature constant moisture test mode is to keep the surface temperature and moisture of the sweating vacant vacant human skin, get indicators such as thermal resistance, wet resistance, moisturectity index, etc. For testing, evaluating the hot wet performance of clothing. Table 1 is a humidity and a moisture absorbing index measured when the sweat peak naked and wearing different test clothing. As can be seen from Table 1, the sweating dummy naked and the moisture and moisturectation index measured during different clothing are repeated, and the thermal wet transmission performance of different clothing can be effectively distinguished.
3.2 Constant temperature and sweating rate test mode
The constant temperature and intensive sweating rate test mode is to make the sweat skin surface temperature and sweating rate constant, get the cost of costumes under the sweating conditions, mainly for Comparing the change in the cost of clothing insulation performance in different sweat times, the temperature resistance value is changed, which provides a scientific basis for the design of the fabric design and fabrics and the improvement of the thermal resistance of clothing. Table 2 is a fluffy trousers, and the clothing of the camouflage mask is in the test results of the sweat ratio of 50 g (/ h · m2), 100 g (/ h · m2) and 200 g (/ h · m2), respectively.
3. Simulation of live test mode
Simulated real person test mode is to change the surface temperature of the sweating vacant human skin with the test ambient temperature, and the sweat is changed with the surface temperature of the skin, that is, during the test process, according to the true people's test The relationship between the human sweating and the surface temperature of the skin, allows the sweating rate of the dummy to supply the skin surface temperature, and the heat transfer is divided into two parts: dry heat and evaporation heat dissipation, dry heat-dissipating heat is used according to the heat flow of the real person. The relationship equation of the skin temperature is supplied, and the evaporative heat dissipation portion is supplied according to the heat required to evap the sweat. This test method can obtain indicators such as human balance skin temperature, hot humidity index and evaporation heat dissipation under different test conditions.
4 clothing hot and moisturizing performance test and evaluation
Application of sweating dummy system for existing military uniforms, public security raincoat, comfortable underwear,The thermal wet performance of the anti-care clothing and SARS protective clothing is tested, and the test results are shown in Table 3. The current summer dress is the newly developed polyester special deformation filament fabric, which has better water supply and quick-drying, and the sweat peers measure the moisturectity index of 0.480 (ideally, the dummy naked moisture) Index is 0.53), excellent in hot and humidity, polyester cotton camouflage is mainly used for military personnel training activities or labor, requires wear-resistant and having better moistureens, breathable performance. As can be seen from Table 3, the moisture permeability index is 0.430, and the hot and humidity comfort is better. Several kinds of public dishes in Table 3, compared to PTFE composite polyester fabric rainccoat, minimum wet resistance, maximum moisture permeability index, best hot resistance, and thermal resistance, wet resistance of PVC polyvinyl chloride The maximum, the moisture permeability index is almost zero, the wet performance is the worst, it is recommended to use PTFE composite polyester fabric public security raincoat. The comfortable knit set is a comfortable fabric developed by a textile study. Compared with the instant polyester cotton knit set, the newly developed comfortable knitting sleeve is much lower than that of ordinary polyester cotton knit set. The wet index is larger than the latter, showing a good wearing hot and humidity. In both anti-chemical clothing, standard ventilation anti-chemical processes use surface carbon treatment, and heat zone-type gas-resistant suit is carbon fiber fabric, combined compared the thermal resistance, wet resistance and moisturect index of two anti-chemicals. The thermal wet comfortable performance of hot zone type gas-resistant procedure is slightly better than standard ventilation anti-chemicals. Two SARS protective clothing is a protective clothing wearing medical staff when I fight against SARS. From the test results, the moisture resistance of breathable SARS is significantly lower than the standard SARS protective clothing. The former's moisturephening index is significantly higher than the latter. The medical staff also felt that the hot breathable self-service comfort was good, and the results of the sweating dummy were consistent. The above-mentioned sweat in the test trial showed that the sweat peak test system can effectively distinguish between the hot and humidity of different clothing.



More about sweating warm body prosthesis:
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