Burning dummy systemRelease time: 2018-06-26 17:02
For a long time, how to objectively and scientifically evaluate the protective performance of special clothing such as military uniforms, fire protection clothing, fire protection clothing, and flame retardant and high temperature work clothing has been a difficult problem for the industry. At present, this evaluation can only be made based on the burning or flame retardant experiments of clothing fabrics. It cannot reflect the actual effects of clothing composition and human action, and may even cause the consequences of insufficient or excessive protection of the overall clothing in the actual working environment. Standard Group's well-known company outside the United Nations develops a combustion dummy system. The combustion dummy can accurately sense high-temperature heat flux in different active positions, accurately predict the burning degree of the skin and skin, and a combustion simulation environment experiment that simulates the high-risk environment of a fire field. room.
EN ISO 11612, EN ISO 11611, ISO 13506, EN469: 2005, etc. are applicable to this test system.
The combustion dummy test system is used to test the overall thermal protection performance of protective clothing. The complete combustion dummy system consists of a combustion chamber, a combustion dummy and a gas supply control system.
Burning dummy and design principle:
The system is mainly composed of a burning dummy, a data acquisition device, a flame generation and control device, a skin heat transfer model and a burn evaluation model, and a system centralized control and application software platform. The design principle is to simulate the thermal exposure process of the human body in the burning flame and test the change of the surface temperature of the dummy. It is estimated that the second and third degree burns of the skin and the percentage of total burn area may be caused. The worse the flame retardancy protection performance.
The duration of the flame of the burning dummy body when used in clothing testing is generally 4 s. The surface of the dummy may need to withstand a burning flame of up to 300 ° C. Therefore, the material of the dummy body must have a short-term burning flame above 300 ° C. Good thermal stability, can withstand the harsh fire environment; the response of the sensor on the dummy surface to the combustion flame should be close to the human skin's response to the combustion flame; the data acquisition and processing device can quickly collect the dummy surface sensor data.
Burning dummy body:
According to the above design requirements, through comparative analysis of the physical properties of high temperature resistant materials, polyimide with the highest current temperature resistance grade, the best mechanical properties, dielectric properties and corrosion resistance is selected as the main body material of the combustion dummy. According to the dummy The appearance characteristics of the model, the dummy body model is manufactured according to the following process: synthetic polyimide → cured resin material → making molds of human anatomy and high temperature molding → vacuum curing → surface treatment.
Dummy surface heat sensor:
The function of the thermal sensor on the surface of the dummy skin is to sense the degree of heat of the human skin exposed to the fire environment, and then predict the degree of burns that may occur on the skin. The thermal sensors used abroad are mainly TPP copper sheet heat flow sensor, adiabatic copper sheet sensor and embedded thermocouple sensor. Of these three types of sensors, adiabatic copper sensors are the most reliable thermal sensors.
The adiabatic copper sheet sensor is similar to the TPP copper sheet heat flow meter sensor, with stable readings, fast response, wide range, and good repeatability. At the same time, the sensor volume is smaller than the TPP sensor, occupying much less space and mass than the TPP copper sheet heat flow meter. In high heat environments, the average response speed of embedded thermocouple sensors is slower than that of adiabatic copper sensors. To this end, the research team developed a thermally insulated copper sheet sensor. The copper sheet has a diameter of 1 cm and a thickness of 0.16 cm. The brazing process was used to connect the copper sheet to a K-type thermocouple with a wire diameter of 0.2 mm, and the measurement accuracy reached 0.2 ° C.
Considering the area of the dummy, data collection, and calculation of burn assessment, etc., 120 heat-insulating copper sheet sensors were evenly arranged on the surface of the dummy. When installing the sensor, use a milling cutter to drill holes according to the diameter and depth of the copper sheet to ensure that the surface and surrounding of the sensor are closely matched with the dummy body, and the sensor is evenly distributed.
Burning dummy experiment process:
A total of 6 groups of 12 flamethrowers were installed around the burning dummy. Each flamethrower can provide 84 kilowatts per square meter (KW / m2) of heat flow within 2 to 3 seconds, realistically simulating the deflagration flash of a real fire field in a critical state. fire. In the experiment, all flamethrowers ignited together, and 12 fire dragons rose into the air, and the burning dummy wearing fire-resistant clothing was swallowed up by 3 meters of flame instantly. In order to study the emergency response characteristics of the human body in the actual fire scene, the research experts also suspended the burning dummy in the fire scene to automatically adjust the orientation and orientation of the dummy at different speeds. At the end of the experiment, by analyzing the data output by each sensor on the dummy and calculating the heat flux, the burn level, total burn area, and time of the second and third burns can be accurately reported on the skin surface of each sensor. .
This system fully meets the relevant technical indicators of ISO13506, ASTMF1930 and other combustion dummy system evaluations. The dummy's body size adopts the standard Chinese adult male body size, and 135 heat flow sensors are set throughout the body, covering various parts such as the trunk, head, hands, and feet. It can be used for the evaluation of thermal protective clothing, and can also meet the needs of the evaluation of a complete set of thermal protective equipment such as helmets, gloves, and fire boots; in addition, the burning dummy is also provided with shoulders, elbows, hips, knees and ankles, as well as rotation, The sliding system can simulate various postures and activities of the human body .
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