System Design And Optimization Of Thermal Manikin

Non- perspiring thermal manikin is an equipment simulating human’s heat transfer, and is mainly used to test the clothing thermal insulation and estimate the comfort of indoor thermal environment. The technology of the thermal manikin has developed maturely in foreign countries. In China, it has also developed rapidly in recent years. The non- perspiring thermal manikin described in this paper uses wiring to cover the outer surface of the manikin to simulate the heat loss of human body. The wiring is covered by a material simulating human skin to complete the manufacture of the thermal manikin. Meanwhile, the control system of heating is developed and optimized, and make it meet the standard of clothing thermal insulation test.At the beginning of this study. The relationship between heating power and the environmental temperature was determined by referring to the sensible heat loss of the human body under different environmental temperature. The thermal manikin described in this paper is divided into 16 body parts except the head, hands and feet. The method of wiring laying is modified and optimized on the basis of the previous research. And the appropriate material simulating human skin was chosen to finish the laying of the whole thermal manikin’s skin.The hardware of the thermal manikin system contains two parts. One is the temperature(power) control system which is composed of the voltage control module and direct current motor speed controller. And the other is the temperature acquisition system consists of PT100 thermometer and temperature acquisition module. Based on the Labview software platform, the manikin control program was developed and written. Using the PID controller could acquire a result of high accuracy, fast convergence and good performance of anti-jamming.In the late study, we further optimizes the thermal manikin control system. There are two methods used for the control system of manikin in this paper. One is to keep the supply power constant, and the other is to keep heater temperature constant. Experimental analysis is done respectively on the stability and uniformity of the manikin surface temperature under two control mode, and the result shows it meets the requirement.The main use of thermal manikin is measuring the thermal insulation of clothing. After the manufacture of the manikin is completed. the nude manikin surface air layer thermal insulation was tested under two control mode. The result of controlling supply power constant is in line with the national standard. Then two T-shirts’ thermal insulation is tested, and the result of constant supply power method is close to the theoretical value while that of constant heater temperature method has a big deviation. This paper analyzes the reason for error, and lays foundation for the more accurate test of clothing thermal insulation in the future.