In response to the development prospects of the burning dummy, let's talk about what improvements have been made to the burning dummy today.Improvements in the dummy testing system:
1, further improve the sensor, closer to the nature of the real skin. The choice of sensors is a very important part. Currently used sensors are mainly copper sheet sensors and skin simulation sensors, but both have shortcomings. Copper sensor and skin heat absorption rate is different, the skin temperature rise faster than the copper sensor; and skin simulation sensor density, heat capacity, heat dissipation coefficient and the skin has a certain gap. Therefore, improving the sensor to make it closer to the skin's heat absorption capacity is important to improve the accuracy of the combustion dummy test.
2, Combination of combustion dummy and sweating dummy, comprehensive and objective evaluation of protective clothing. Under the current test conditions, neither the TPP test device nor the combustion dummy test system can simulate water vapor transfer. Water vapor transmission has a non-negligible impact on protective performance. Firefighters often get wet during firefighting, and the firefighters themselves sweat. If the burning dummy can be improved to simulate the sweating state, that is, to achieve the perfect combination of burning dummy and sweating dummy, you can provide objective test results for the overall test of protective clothing, whether it is protective performance testing or comfort testing.
3, the intelligent research of the burning dummy, more realistic simulation of fire fighting situation. Most of the existing international burning dummies can not move. And the different levels of activity must affect the test results of protective performance, so the evaluation and study of thermal protection performance can not be limited to the static state of the situation. If the dummy is equipped with an intelligent system to make it more like a real person, it can more realistically simulate the actual fire fighting situation of firefighters and more objectively and comprehensively evaluate the fire suit.
4,Realistic reproduction of various fire conditions, broaden the research field of flame retardant protective clothing. The current combustion dummy system can only simulate the fire environment, but in addition to fire, there may be water, smoke, poison, improve the combustion dummy test system, so that it can simulate both fire, but also water, poison, smoke fire environment, can broaden the research field of flame retardant protective clothing. Widening the application field of combustion dummies:
1）Burning dummy testing technology is an internationally recognized optimal technology for objectively evaluating the overall thermal protection performance of garments.
2) Testing and analyzing garments. Using the combustion dummy test system, it is possible to carry out various firefighting uniforms, military uniforms and other protective equipment flame retardant performance measurement and research on the influencing factors. Shorten the research cycle of new flame retardant materials and equipment, improve the level of research, and promote the development of individual protective equipment.
3) Research on human body. The use of combustion dummy test system to create real flame-clothing-skin environmental conditions, monitoring the combustion process of dummy skin heat flow and temperature changes, for further biophysical research on human skin tissue burn analysis provides an effective data base.
4) Safety protection. In addition to firefighting clothing, ordinary clothing also requires a certain level of flame retardant properties. Burning dummy can not only be used in military protective clothing testing, in civilian use for the promotion of thermal protection fabrics, clothing and other equipment development, protection from fire and thermal radiation and other dangerous environments caused by thermal injury to the human body, also has important research significance.The main components of the combustion dummy system:
The system is mainly composed of a combustion dummy, data acquisition device, flame generation and control device, skin heat transfer model and burn assessment model, as well as the system centralized control and application software platform. The principle is to simulate the thermal exposure process of the dressed human body in the burning flame, test the change of the surface temperature of the dummy, and predict the percentage of second and third degree burns and total burn area that may be caused by the skin, the larger the percentage of burn area, the worse the flame retardant protection performance of the clothing.
Burning dummy: made of non-metallic materials, clothing test flame duration is generally 4s, the dummy surface needs to have good thermal stability under the burning flame conditions of 300 ℃.
Sensor: combustion dummy surface sensor response to the combustion flame, should be close to the response of human skin to the flame. At present, the sensors used at home and abroad are mainly TPP copper sheet heat flow meter sensor, adiabatic copper sheet sensor and embedded thermocouple sensor three. The deployment of the sensor needs to take into account the dummy area, data acquisition, burn assessment calculation and other factors.
Data acquisition: The data acquisition device mainly completes the signal acquisition and processing of each sensor on the dummy surface. To ensure the synchronous and efficient acquisition of multiple sensor signals, multiple data processing units are required.
Flame generation and control device:The flame generation and control device includes the selection of fuel (propane material is usually used), gas delivery pipeline and burner.
Application software:The application software platform is the nerve center of the whole system, which mainly consists of data acquisition module, detection and control module, matrix operation module, burn prediction analysis processing module and system resource management module.