In order to reduce the probability of fault occurrence of local ventilation system in coal mine and prevent gas from exceeding the standard limit, an approach incorporating the reliability analysis, rough set theory, ...In order to reduce the probability of fault occurrence of local ventilation system in coal mine and prevent gas from exceeding the standard limit, an approach incorporating the reliability analysis, rough set theory, genetic algorithm (GA), and intelligent decision support system (IDSS) was used to establish and develop a fault diagnosis system of local ventilation in coal mine. Fault tree model was established and its reliability analysis was performed. The algorithms and software of key fault symptom and fault diagnosis rule acquiring were also analyzed and developed. Finally, a prototype system was developed and demonstrated by a mine instance. The research results indicate that the proposed approach in this paper can accurately and quickly find the fault reason in a local ventilation system of coal mines and can reduce difficulty of the fault diagnosis of the local ventilation system, which is significant to decrease gas exploding accidents in coal mines.展开更多
Aperture design is very important in the design process of rainwear,as garment aperture is one of the main pathways for air exchange between clothing microclimate and the environment.The purpose of this study was to i...Aperture design is very important in the design process of rainwear,as garment aperture is one of the main pathways for air exchange between clothing microclimate and the environment.The purpose of this study was to investigate the effects of aperture design on whole and local ventilations of rainwear.Ventilation was measured by a tester developed based on the steady-state method.A rainwear suit with top and bottom was chosen as the basic ensemble.Apertures were added at the arm,chest,back and knee separately.Local ventilation of the arm,chest,back and whole ventilation of the top and bottom in different walking and wind conditions were measured.Local and whole ventilations at five aperture conditions for the top and four for the bottom were studied.The results indicated that local ventilation value of the chest was the biggest and the arm was the smallest.Whole ventilation of the suit was the biggest when walking at 5.6 km/h,with all the designed apertures opened.Local ventilation value was bigger when opening arm aperture than that of opening chest or back aperture.The bottom ventilation was the highest when both front and back apertures were opened.展开更多
基金Projects 04JK197T supported by Shaanxi Education Bureau Science Foundation and 2005E202 by Shaanxi Science Foundation
文摘In order to reduce the probability of fault occurrence of local ventilation system in coal mine and prevent gas from exceeding the standard limit, an approach incorporating the reliability analysis, rough set theory, genetic algorithm (GA), and intelligent decision support system (IDSS) was used to establish and develop a fault diagnosis system of local ventilation in coal mine. Fault tree model was established and its reliability analysis was performed. The algorithms and software of key fault symptom and fault diagnosis rule acquiring were also analyzed and developed. Finally, a prototype system was developed and demonstrated by a mine instance. The research results indicate that the proposed approach in this paper can accurately and quickly find the fault reason in a local ventilation system of coal mines and can reduce difficulty of the fault diagnosis of the local ventilation system, which is significant to decrease gas exploding accidents in coal mines.
基金National Natural Science Foundation of China(No.51506076)China’s Post-Doctoral Science Fund(No.2016M591763)Fundamental Research Funds for the Central Universities,China(Nos.JUSRP 51735b,2232017D3-19)
文摘Aperture design is very important in the design process of rainwear,as garment aperture is one of the main pathways for air exchange between clothing microclimate and the environment.The purpose of this study was to investigate the effects of aperture design on whole and local ventilations of rainwear.Ventilation was measured by a tester developed based on the steady-state method.A rainwear suit with top and bottom was chosen as the basic ensemble.Apertures were added at the arm,chest,back and knee separately.Local ventilation of the arm,chest,back and whole ventilation of the top and bottom in different walking and wind conditions were measured.Local and whole ventilations at five aperture conditions for the top and four for the bottom were studied.The results indicated that local ventilation value of the chest was the biggest and the arm was the smallest.Whole ventilation of the suit was the biggest when walking at 5.6 km/h,with all the designed apertures opened.Local ventilation value was bigger when opening arm aperture than that of opening chest or back aperture.The bottom ventilation was the highest when both front and back apertures were opened.
