Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.011
G. Lin, Wang Jiachen, Kong Dezhong, Wu Guiyi, Ma Zhenqian
In order to solve difficulty of surrounding rock control under influence of dynamic pressureꎬ with uphill coal transportation roadway of a mine in Guizhou province as engineering backgroundꎬ main features of surrounding rock deformation of such kind of roadway were clarified through field investigation. Thenꎬ spatial and temporal distribution characteristics of plastic zoneꎬ stress field and displacement field were obtained by numerical simulation analysisꎬ and condition for shear ̄slip ̄fault occurrence of coal ̄rock interface was analyzed theoretically. Thenꎬ through analysis on action principle of overlap arch bearing structureꎬ it was found that failure mechanism of original " bolt + mesh + shotcrete + anchor cable" support was disappearance of main compression arch and effect limitation of subordinate compression arch. 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 Finallyꎬ repairing principle and a scheme were put forward with the core of collaborative control of " grouting after covering U ̄steel shed + asymmetric and inclined cross ̄layer locking clamp cables" . The practice shows that serious asymmetric deformation of surrounding rock can be effectively controlled with the proposed scheme.
{"title":"Deformation mechanism and repairing technology for coal-rock uphill roadway under influence of dynamic pressure","authors":"G. Lin, Wang Jiachen, Kong Dezhong, Wu Guiyi, Ma Zhenqian","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.011","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.011","url":null,"abstract":"In order to solve difficulty of surrounding rock control under influence of dynamic pressureꎬ with uphill coal transportation roadway of a mine in Guizhou province as engineering backgroundꎬ main features of surrounding rock deformation of such kind of roadway were clarified through field investigation. Thenꎬ spatial and temporal distribution characteristics of plastic zoneꎬ stress field and displacement field were obtained by numerical simulation analysisꎬ and condition for shear ̄slip ̄fault occurrence of coal ̄rock interface was analyzed theoretically. Thenꎬ through analysis on action principle of overlap arch bearing structureꎬ it was found that failure mechanism of original \" bolt + mesh + shotcrete + anchor cable\" support was disappearance of main compression arch and effect limitation of subordinate compression arch. 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 Finallyꎬ repairing principle and a scheme were put forward with the core of collaborative control of \" grouting after covering U ̄steel shed + asymmetric and inclined cross ̄layer locking clamp cables\" . The practice shows that serious asymmetric deformation of surrounding rock can be effectively controlled with the proposed scheme.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"28 1","pages":"67"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89013262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.007
Wen Tingxin, Wang Guitong, Kong Xiangbo, Li Mengxiao, BO Jingkai
In order to accurately identify unsafe behaviors of miners and reduce occurrence of accidents in coal minesꎬ an image recognition method combining transfer learning and deep residual network is proposed. Firstlyꎬ behavior instances of miners were divided into three dimensionsꎬ namely completely safe behaviorsꎬ relatively safe behaviorsꎬ and unsafe behaviorsꎬ among which completely safe behaviors included walkingꎬ sitting and standingꎬ relatively safe behaviors included bendingꎬ squattingꎬ liftingꎬ pushingꎬ pullingꎬ waving and clappingꎬ and unsafe behaviors included falling and throwing. Thenꎬ ResNet50 network was used for trainingꎬ and transfer learning weight parameters of ImageNet data set were fine ̄tuned. Finallyꎬ 12 classification was conducted through full connection layerꎬ and final classification results were checked against test data. The results show that residual network model based on transfer learning is superior to other deep neural network models in identification accuracy of falling and throwing movementsꎬ and it can effectively identify unsafe behaviorsꎬ thus avoiding accidents caused by human factors.
{"title":"Identification of miners' unsafe behaviors based on transfer learning and residual network","authors":"Wen Tingxin, Wang Guitong, Kong Xiangbo, Li Mengxiao, BO Jingkai","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.007","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.007","url":null,"abstract":"In order to accurately identify unsafe behaviors of miners and reduce occurrence of accidents in coal minesꎬ an image recognition method combining transfer learning and deep residual network is proposed. Firstlyꎬ behavior instances of miners were divided into three dimensionsꎬ namely completely safe behaviorsꎬ relatively safe behaviorsꎬ and unsafe behaviorsꎬ among which completely safe behaviors included walkingꎬ sitting and standingꎬ relatively safe behaviors included bendingꎬ squattingꎬ liftingꎬ pushingꎬ pullingꎬ waving and clappingꎬ and unsafe behaviors included falling and throwing. Thenꎬ ResNet50 network was used for trainingꎬ and transfer learning weight parameters of ImageNet data set were fine ̄tuned. Finallyꎬ 12 classification was conducted through full connection layerꎬ and final classification results were checked against test data. The results show that residual network model based on transfer learning is superior to other deep neural network models in identification accuracy of falling and throwing movementsꎬ and it can effectively identify unsafe behaviorsꎬ thus avoiding accidents caused by human factors.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"27 1","pages":"41"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82108752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.010
Song Gaofeng, Zhang Yan-bing, Sun Peipei, Shen Shuoxun, Wang Zhirong
In order to explore variation characteristics of related parameters of corrosion acoustic emission signalsꎬ experiment was carried out with a common vertical metal storage tank as research object to study characteristics of its acoustic emission source for corrosion. Thenꎬ a safety evaluation model based on BP neural network was establishedꎬ and case study of its application was carried out. The results show that acoustic emission activity and intensity will change along with severity of corrosion reactionꎬ and wave forms of corrosion signals in different periods of corrosion activity will exhibit three typesꎬ continuousꎬ abrupt and hybrid types with its frequencies mainly concentrating between 20-60 kHz. The output of BP neural network model is consistent with actual evaluation resultsꎬ which proves its feasibility and effectiveness.
{"title":"Safety evaluation method based on acoustic emission technology for large-scale storage tanks","authors":"Song Gaofeng, Zhang Yan-bing, Sun Peipei, Shen Shuoxun, Wang Zhirong","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.010","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.010","url":null,"abstract":"In order to explore variation characteristics of related parameters of corrosion acoustic emission signalsꎬ experiment was carried out with a common vertical metal storage tank as research object to study characteristics of its acoustic emission source for corrosion. Thenꎬ a safety evaluation model based on BP neural network was establishedꎬ and case study of its application was carried out. The results show that acoustic emission activity and intensity will change along with severity of corrosion reactionꎬ and wave forms of corrosion signals in different periods of corrosion activity will exhibit three typesꎬ continuousꎬ abrupt and hybrid types with its frequencies mainly concentrating between 20-60 kHz. The output of BP neural network model is consistent with actual evaluation resultsꎬ which proves its feasibility and effectiveness.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"150 1","pages":"60"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87728912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.012
Huang Zi-chao, Si Rongjun
In order to explore prevention and control measures for gas and coal dust explosionꎬ explosion ̄ proof performance of powder clouds is tested in roadways with large ̄scale sections. Firstlyꎬ an 2 m large pipe and its open space were used to study formation process and dynamic distribution characteristics of powder clouds. On this basisꎬ with explosion pressure and flame velocity as characteristic parametersꎬ gas and coal dust explosion and suppression experiments were conducted in a large roadway with a section of 7 2 m . The results show that the powder can cover 7 4 m section at 60 msꎬ and most of the powder is ejected at 1 200 msꎬ forming an effective explosion ̄proof barrier. When surface density of powder cloud reaches 8 1 kg / mꎬ flame can be completely extinguished within 13 mꎬ and maximum explosion pressure is reduced by 57 0% from 0 293 to 0 126 MPa while pressure rising time at 140 m is delayed by 137 ms. As power concentration increasesꎬ suppression effect of cloud curtain is enhancedꎬ and it can extinguish 第 3 期 黄子超等: 粉体云幕对瓦斯煤尘爆炸隔爆效果的试验研究 flame in a short distance and greatly attenuate explosion pressure.
{"title":"Experimental study on suppression of gas and coal dust explosion by powder clouds","authors":"Huang Zi-chao, Si Rongjun","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.012","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.012","url":null,"abstract":"In order to explore prevention and control measures for gas and coal dust explosionꎬ explosion ̄ proof performance of powder clouds is tested in roadways with large ̄scale sections. Firstlyꎬ an 2 m large pipe and its open space were used to study formation process and dynamic distribution characteristics of powder clouds. On this basisꎬ with explosion pressure and flame velocity as characteristic parametersꎬ gas and coal dust explosion and suppression experiments were conducted in a large roadway with a section of 7 2 m . The results show that the powder can cover 7 4 m section at 60 msꎬ and most of the powder is ejected at 1 200 msꎬ forming an effective explosion ̄proof barrier. When surface density of powder cloud reaches 8 1 kg / mꎬ flame can be completely extinguished within 13 mꎬ and maximum explosion pressure is reduced by 57 0% from 0 293 to 0 126 MPa while pressure rising time at 140 m is delayed by 137 ms. As power concentration increasesꎬ suppression effect of cloud curtain is enhancedꎬ and it can extinguish 第 3 期 黄子超等: 粉体云幕对瓦斯煤尘爆炸隔爆效果的试验研究 flame in a short distance and greatly attenuate explosion pressure.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"23 1","pages":"74"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77692881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.022
Jiang Xinguo, Ren Hankun, Fan Yingfei, L. Xiang, Fu Chuanyun
In order to reduce accidents of signal ̄coordinated arteriesꎬ changes of traffic safety performance before and after adopting coordinated signal control on arteries were explored. Thenꎬ with data from Shuhan road in Chengdu collectedꎬ SSAM was established based on traffic simulation conflicts. Finallyꎬ a kernel regression model was used to fit simulated traffic conflictsꎬ and safety of arteries before and after coordinated signal control was evaluated based on fitting results. The results show that arteries with signal ̄coordinated control comparatively has worse safety performance when traffic volume is under 3 864 pcu / h. There are more conflicts as small cars reach a too high or too low proportion(P<0 73 or P> 0 83) in traffic flowꎬ and signal ̄coordinated arteries have fewer crossing conflicts and more rear ̄end conflicts.
{"title":"Simulation analysis on traffic safety of signal-coordinated arteries","authors":"Jiang Xinguo, Ren Hankun, Fan Yingfei, L. Xiang, Fu Chuanyun","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.022","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.022","url":null,"abstract":"In order to reduce accidents of signal ̄coordinated arteriesꎬ changes of traffic safety performance before and after adopting coordinated signal control on arteries were explored. Thenꎬ with data from Shuhan road in Chengdu collectedꎬ SSAM was established based on traffic simulation conflicts. Finallyꎬ a kernel regression model was used to fit simulated traffic conflictsꎬ and safety of arteries before and after coordinated signal control was evaluated based on fitting results. The results show that arteries with signal ̄coordinated control comparatively has worse safety performance when traffic volume is under 3 864 pcu / h. There are more conflicts as small cars reach a too high or too low proportion(P<0 73 or P> 0 83) in traffic flowꎬ and signal ̄coordinated arteries have fewer crossing conflicts and more rear ̄end conflicts.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"30 1","pages":"143"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86206930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.018
Zhao Aohan, Ma Yankun, Liu Jian, Chen Dezhong, Yuan Hongyong, Fu Ming
In order to analyze gas's influence on AE band energy during coal rupture under loadingꎬ with structural coal as research objectꎬ uni ̄axial compression test was carried out by using self ̄developed gas ̄ containing coal test device. Thenꎬ signal processing method of fast Fourier transform (FFT) and wavelet packet analysis was used to obtain characteristics of AE band energy during coal rupture under different gas 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 pressure. The results show that the greater gas pressure isꎬ the larger main frequency of AE signal isꎬ the narrower frequency band isꎬ and spectrum transforms gradually from a complex multi ̄peak form to a single peak form. When three is gasꎬ with the increase of loading stressꎬ frequency band enriches and spectrum shifts to left gradually. As gas pressure changesꎬ energy of 2 92-4 38 kHzꎬ 4 38-5 84 and 7 3-8 76 kHz changes significantly while that in 2 92-4 38 kHz is basically same as the sum of 4 38-5 84 and 7 3-8 76 kHzꎬ showing an opposite trend. When stress of structural coal increasesꎬ 4 38-5 84 and 7 38 76 kHz indicate the largest increase and decrease of energy respectively. 2 92-4 38 kHz and 4 385 84 kHz can be used as characteristic frequency bands to study damage of structural coal under loading in mines with gas.
{"title":"Energy characteristics of AE signal frequency band during coal rupture in mines with gas","authors":"Zhao Aohan, Ma Yankun, Liu Jian, Chen Dezhong, Yuan Hongyong, Fu Ming","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.018","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.018","url":null,"abstract":"In order to analyze gas's influence on AE band energy during coal rupture under loadingꎬ with structural coal as research objectꎬ uni ̄axial compression test was carried out by using self ̄developed gas ̄ containing coal test device. Thenꎬ signal processing method of fast Fourier transform (FFT) and wavelet packet analysis was used to obtain characteristics of AE band energy during coal rupture under different gas 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 pressure. The results show that the greater gas pressure isꎬ the larger main frequency of AE signal isꎬ the narrower frequency band isꎬ and spectrum transforms gradually from a complex multi ̄peak form to a single peak form. When three is gasꎬ with the increase of loading stressꎬ frequency band enriches and spectrum shifts to left gradually. As gas pressure changesꎬ energy of 2 92-4 38 kHzꎬ 4 38-5 84 and 7 3-8 76 kHz changes significantly while that in 2 92-4 38 kHz is basically same as the sum of 4 38-5 84 and 7 3-8 76 kHzꎬ showing an opposite trend. When stress of structural coal increasesꎬ 4 38-5 84 and 7 38 76 kHz indicate the largest increase and decrease of energy respectively. 2 92-4 38 kHz and 4 385 84 kHz can be used as characteristic frequency bands to study damage of structural coal under loading in mines with gas.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"103 1","pages":"115"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79518254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.008
Jin Lianghai, L. Jiaxin, Zheng Xiazhong, Chen Shu, Chen Yan-gao
In order to ensure safety and efficiency of lifting operation and reduce risks of its spatial conflictsꎬ Manhattan plane of lifting operation was designed. Thenꎬ OARMST model of lifting trajectory was constructed by analyzing spatial conflict factorsꎬ mechanical operation conditions and construction organization conditions. Finallyꎬ lifting trajectory planning system was developed to explore safe moving trace of lifting objects under multiple sites and obstacles by integrating Dijkstra heuristic algorithm and 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 ultra wide band (UWB) positioning technology. The research shows that the optimal moving trace obtained from OARMST model can avoid spatial conflictsꎬ prevent multiple sudden suspensions of hanging objects and redundant operation of drivers by reducing turns and displacement of objectsꎬ therefore improving safe dispatching of lifting operation.
{"title":"Trajectory planning model for lifting operation considering spatial conflict","authors":"Jin Lianghai, L. Jiaxin, Zheng Xiazhong, Chen Shu, Chen Yan-gao","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.008","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.008","url":null,"abstract":"In order to ensure safety and efficiency of lifting operation and reduce risks of its spatial conflictsꎬ Manhattan plane of lifting operation was designed. Thenꎬ OARMST model of lifting trajectory was constructed by analyzing spatial conflict factorsꎬ mechanical operation conditions and construction organization conditions. Finallyꎬ lifting trajectory planning system was developed to explore safe moving trace of lifting objects under multiple sites and obstacles by integrating Dijkstra heuristic algorithm and 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 ultra wide band (UWB) positioning technology. The research shows that the optimal moving trace obtained from OARMST model can avoid spatial conflictsꎬ prevent multiple sudden suspensions of hanging objects and redundant operation of drivers by reducing turns and displacement of objectsꎬ therefore improving safe dispatching of lifting operation.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"20 1 1","pages":"47"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78152085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to address problems of heavy materials and inefficient construction of traditional mine ventilation structuresꎬ a new type of graphene polyurethane foam was developed and its performance for various structures was tested. Firstlyꎬ new graphene polyurethane foam was prepared using one ̄step method. Thenꎬ its hermeticity was tested through gas permeability experiments of plastic films and sheets. Finallyꎬ its structures were analyzed by using a comprehensive thermal analyzerꎬ a Fourier transform infrared spectrometer and a metallographic microscope. The results show that the density of new graphene polyurethane foam is only 40 kg / m . Infrared spectrum shows that it is rich in organic functional groups such as C = Cꎬ C = Oꎬ ̄OHꎬ ̄CO and ̄NHꎬ and based on observation of metallurgical microscopeꎬ distribution of 160 μm foam is uniform and stable. And the new material remains highly efficient and hermetic within 30 days of simulation testꎬ maintains excellent thermal stability within 400 °Cꎬ and can 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 extinguish within 0 13 s from fireꎬ thus reducing fire risks during its use as a temporary ventilation structure in the mine.
针对传统矿井通风结构材料重、施工效率低的问题ꎬ，研制了一种新型石墨烯聚氨酯泡沫材料，并对其在各种结构中的性能进行了测试。首先采用一步法制备了新型石墨烯聚氨酯泡沫ꎬ。然后ꎬ通过塑料薄膜和塑料片材的透气性实验来测试其密封性。最后利用综合热分析仪ꎬ、傅里叶变换红外光谱仪和金相显微镜对其结构进行了分析ꎬ。结果表明，新型石墨烯聚氨酯泡沫的密度仅为40 kg / m。红外光谱显示其含有丰富的C = CꎬC = Oꎬ' OH 'ꎬ' CO '和' NHꎬ等有机官能团，金相显微镜观察发现ꎬ160 μm泡沫分布均匀稳定。新材料在模拟试验30天内保持高效和密闭性ꎬ在400°C内保持优异的热稳定性ꎬ并且可以在013秒内扑灭火ꎬ从而降低了作为矿井临时通风结构使用时的火灾风险。
{"title":"Experimental research on temporary closed wall constructed by graphene polyurethanen in coal mine","authors":"Wang Hua’e, Tang Yibo, Guo Pengwei, Huang Shihua, Zhou Jinqiang, Guo-ping Qian","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.017","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.017","url":null,"abstract":"In order to address problems of heavy materials and inefficient construction of traditional mine ventilation structuresꎬ a new type of graphene polyurethane foam was developed and its performance for various structures was tested. Firstlyꎬ new graphene polyurethane foam was prepared using one ̄step method. Thenꎬ its hermeticity was tested through gas permeability experiments of plastic films and sheets. Finallyꎬ its structures were analyzed by using a comprehensive thermal analyzerꎬ a Fourier transform infrared spectrometer and a metallographic microscope. The results show that the density of new graphene polyurethane foam is only 40 kg / m . Infrared spectrum shows that it is rich in organic functional groups such as C = Cꎬ C = Oꎬ ̄OHꎬ ̄CO and ̄NHꎬ and based on observation of metallurgical microscopeꎬ distribution of 160 μm foam is uniform and stable. And the new material remains highly efficient and hermetic within 30 days of simulation testꎬ maintains excellent thermal stability within 400 °Cꎬ and can 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 extinguish within 0 13 s from fireꎬ thus reducing fire risks during its use as a temporary ventilation structure in the mine.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"25 1","pages":"109"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89876537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.001
Yang Xiaoqiang, Z. Zhihua, Ji Haoran, Y. Chenguang
In order to explore airport safety performance evaluation index system for the sake of improving airport safety management quality and levelꎬ evaluation index system of civil transportation airport was studied based on CPE. Thenꎬ key safety performance dimensions were established from a multicriteria perspectiveꎬ and an index systemꎬ through filtered statistical analysisꎬ was constructedꎬ which consisted of 6 first ̄level indicators (category)ꎬ 17 second ̄level indicatorsꎬ and 81 third ̄level indicators. Finallyꎬ weights of each index were calculated through G1ꎬ and the system and weights were applied in an airport. The results show that customers and corresponding indicators play little role in the evaluation index systemꎬ and CPE can be combined with it. Multidimensional evaluation index system satisfies actual needs in safety management of civil aviation airports.
{"title":"Research on airport safety performance evaluation index system based on criteria for performance excellence and G1 method","authors":"Yang Xiaoqiang, Z. Zhihua, Ji Haoran, Y. Chenguang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.001","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.001","url":null,"abstract":"In order to explore airport safety performance evaluation index system for the sake of improving airport safety management quality and levelꎬ evaluation index system of civil transportation airport was studied based on CPE. Thenꎬ key safety performance dimensions were established from a multicriteria perspectiveꎬ and an index systemꎬ through filtered statistical analysisꎬ was constructedꎬ which consisted of 6 first ̄level indicators (category)ꎬ 17 second ̄level indicatorsꎬ and 81 third ̄level indicators. Finallyꎬ weights of each index were calculated through G1ꎬ and the system and weights were applied in an airport. The results show that customers and corresponding indicators play little role in the evaluation index systemꎬ and CPE can be combined with it. Multidimensional evaluation index system satisfies actual needs in safety management of civil aviation airports.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"5 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72928904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.03.005
Z. Shaoyu, Xian Xue-lei, Dong Hai-bin, Li Yi, Y. Dongxing
In order to effectively control thermal runaway expansion of high energy density lithium ion batteries (LIBs)ꎬ a composite barrier technology was proposed. With soft NCM811 battery as research objectꎬ existing fire prevention and control method of LIBs was analyzed and relationship between surface temperature and thermal runaway trigger time was determined by studying its thermal runaway characteristics. Thenꎬ thermal insulation tests for materials of different microstructures and sizesꎬ represented by aerogelsꎬ asbestos and rock woolꎬ were conducted to determine relationship between microstructure size and thermal barrier characteristics. Finallyꎬ thermal resistance characteristics of different barrier schemes were studied through thermal isolation tests with different thickness and number of layers. The results show that the smaller microstructure of barrier material is ( less than 70 nm of average free path of air molecules)ꎬ the thinner it isꎬ and the more layers and better thermal barrier effect it has.
{"title":"Research on thermal runaway expansion barrier technology of NCM power battery","authors":"Z. Shaoyu, Xian Xue-lei, Dong Hai-bin, Li Yi, Y. Dongxing","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.03.005","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.03.005","url":null,"abstract":"In order to effectively control thermal runaway expansion of high energy density lithium ion batteries (LIBs)ꎬ a composite barrier technology was proposed. With soft NCM811 battery as research objectꎬ existing fire prevention and control method of LIBs was analyzed and relationship between surface temperature and thermal runaway trigger time was determined by studying its thermal runaway characteristics. Thenꎬ thermal insulation tests for materials of different microstructures and sizesꎬ represented by aerogelsꎬ asbestos and rock woolꎬ were conducted to determine relationship between microstructure size and thermal barrier characteristics. Finallyꎬ thermal resistance characteristics of different barrier schemes were studied through thermal isolation tests with different thickness and number of layers. The results show that the smaller microstructure of barrier material is ( less than 70 nm of average free path of air molecules)ꎬ the thinner it isꎬ and the more layers and better thermal barrier effect it has.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"31 1","pages":"28"},"PeriodicalIF":0.0,"publicationDate":"2020-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72905876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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