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Characterization and assessment of safety situation for regional railway transportation 区域铁路运输安全状况表征与评价
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.006
Yan Xu, P. Qi-yuan, Y. Yong, L. Wenxin
{"title":"Characterization and assessment of safety situation for regional railway transportation","authors":"Yan Xu, P. Qi-yuan, Y. Yong, L. Wenxin","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.006","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.006","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"33 9","pages":"33"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72546267","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}
引用次数: 0
Image detection method of combustible dust cloud 可燃粉尘云的图像检测方法
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.002
Zhao Xinran, Zhang Qi, W. Weidong, Xu Zhiqing
{"title":"Image detection method of combustible dust cloud","authors":"Zhao Xinran, Zhang Qi, W. Weidong, Xu Zhiqing","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.002","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.002","url":null,"abstract":"In recent yearsꎬ production accidents caused by dust explosion occur frequentlyꎬ and on ̄line detection and early warning of dust cloud concentration in dust gathering places has become a key means to control dust explosion. Howeverꎬ installation and identification of dust concentration sensors were limited in large space where dust cloud gathers. In order to address thisꎬ combustible dust cloud recognition method based on deep learning was proposed. End ̄to ̄end detection and identification of explosive dust cloud were conducted by using CNN ̄based Faster R ̄CNN model. Thenꎬ a standard concentration image database was established to verify experimental results. The results show that Faster R ̄CNN model can effectively detect and identify explosive dust cloudsꎬ and it has high recognition accuracy.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"143 1","pages":"8"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77942321","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}
引用次数: 1
Lateral collision dynamics of CSPRs paired approach under influence of wake vortex field 尾流场影响下CSPRs配对方法的横向碰撞动力学
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.004
Lui Fei, Teng Jingjie, Wu Jun, Zhang Zhaoning, Zhang Zonglu
{"title":"Lateral collision dynamics of CSPRs paired approach under influence of wake vortex field","authors":"Lui Fei, Teng Jingjie, Wu Jun, Zhang Zhaoning, Zhang Zonglu","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.004","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.004","url":null,"abstract":"In order to study lateral collision risk of CSPRS paired approachꎬ firstlyꎬ considering traditional approach motion processꎬ an interval model of paired approaching aircrafts was established to determine theoretical interval between them at any time. Secondlyꎬ characteristics of aircrafts' wake vortex field were analyzed to establish a strength calculation model and dissipation model for leading aircraft 's wake flow. Rear aircraft's response mechanism after encountering wake flow was also studiedꎬ and a torque balance model of it in wake vortex field of leading aircraft was developed to determine safety spacing between them. Thenꎬ lateral positioning error of aircrafts was analyzed to obtain probability distribution of 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 actual interval between paired aircraftsꎬ and a risk calculation model was establishedꎬ which was applied to analyze changes of lateral collision risk between leading and rear aircrafts during paired approach. The results show that lateral collision risk increases with the increase of initial interval and positive side windꎬ and then decreases with the increase of aileron 's deflection angle. It rises to the maximum value when paired aircrafts reach the head of runway.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"538 ","pages":"21"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72495342","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}
引用次数: 1
Overcharging safety characteristics of retired VRLA 退役VRLA过充安全特性研究
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.003
Wu Jingyun, Shih-Wei Cheng, Guo Pengyu, Yao Lijuan, Sun Yiting, Jin Yang
{"title":"Overcharging safety characteristics of retired VRLA","authors":"Wu Jingyun, Shih-Wei Cheng, Guo Pengyu, Yao Lijuan, Sun Yiting, Jin Yang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.003","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.003","url":null,"abstract":"In order to solve problems of battery temperature riseꎬ gas generation and failure caused by overcharged VRLAꎬ an experiment was conducted on a module composed of 8 VRLA cells in parallel with rated parameter of each cell at 12 V / 160 Ahꎬ and it was overcharged at constant current of 0􀆰 17 C (27 A). The results show that H2ꎬ SO2ꎬ and CO are generated in sequence 169ꎬ 189ꎬ and 209 s after overcharge while hydrocarbon gas is generated at 33 minutes. 17􀆰 6 V is the maximum charging voltage for retired VRLA batteriesꎬ and once it is reachedꎬ internal electrolytic water as well as other reactions will be intensified. According to thermal simulation temperature curveꎬ internal and external temperature difference of the module can be 40 °C while temperature difference of each cell can also be significant after overcharge for a long time with a maximum gap of 30 °C . In additionꎬ retired VRLA does not cause obvious deformation and combustion after overcharging. But abnormal status of batteriesꎬ like overchargingꎬ can be warned by monitoring concentration variation of H2 .","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"70 1","pages":"14"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84018550","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}
引用次数: 0
Experimental research on suppression of NH4H2PO4 on sucrose dust explosion NH4H2PO4抑制蔗糖粉尘爆炸的实验研究
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.007
Qin Xiaoling, Li Xiaoquan
{"title":"Experimental research on suppression of NH4H2PO4 on sucrose dust explosion","authors":"Qin Xiaoling, Li Xiaoquan","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.007","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.007","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"7 1","pages":"41"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85308170","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}
引用次数: 0
A proposed model and application for pedestrian evacuation time calculation in road tunnels 一种道路隧道行人疏散时间计算模型及其应用
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.019
Cheng Yanying, Xie Wei, Zhang Yu-chun, Peng Qi, Li Jiewei, Chen Ke
{"title":"A proposed model and application for pedestrian evacuation time calculation in road tunnels","authors":"Cheng Yanying, Xie Wei, Zhang Yu-chun, Peng Qi, Li Jiewei, Chen Ke","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.019","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.019","url":null,"abstract":"In order to accurately calculate pedestrians' evacuation time and provide a theoretical basis for reasonable design of evacuation routes in tunnelsꎬ an innovative empirical model was proposed to calculate evacuation time in road tunnelsꎬ which considered influence of parameters like distanceꎬ movement speedꎬ tunnel widthꎬ occupant flow and traffic volume. In this modelꎬ critical conditions of exit cloggingꎬ its start time and duration were all taken into consideration. Thenꎬ with a real underwater tunnel as an exampleꎬ influence of occupant density and their movement speed on evacuation time and exit clogging was analyzed after different horizontal or vertical escape routes were setꎬ and rules of equivalent setting space of 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 horizontal and vertical routes were proposed. The results show that pedestrians' evacuation time is affected by their walking speed to different degrees in the event of different (horizontal / vertical) routesꎬbut it is closely related with occupant density. And evacuation capacity of horizontal routes is significantly greater than that of vertical ones under the same condition.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"56 1","pages":"121"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77814520","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}
引用次数: 0
Influence of multi-component combustible gases on explosion characteristics and free radical emission spectrum of CH4 多组分可燃气体对CH4爆炸特性及自由基发射谱的影响
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.001
Luo Zhenmin, Wan Zijin, Su Bin, Li Kui, Shi-nong Jing
{"title":"Influence of multi-component combustible gases on explosion characteristics and free radical emission spectrum of CH4","authors":"Luo Zhenmin, Wan Zijin, Su Bin, Li Kui, Shi-nong Jing","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.001","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.001","url":null,"abstract":"In order to investigate influence of multi ̄component combustible gases on explosion characteristics of CH4 in fire area of minesꎬ a 20 L multifunctional spherical gas explosion device was used for experiments to collect explosion pressure parameters. Thenꎬ emission spectra of key free radicals OH and CH2O of CH4 explosion were obtained through a digital oscilloscope. Finallyꎬ influence of multi ̄ 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年 component combustible gases on explosion characteristics of CH4 was analyzed from macro and micro aspectsꎬ and they were correlated and compared. The research shows that their influence indicates different characteristics due to different oxygen contents. An increase in multi ̄component combustible gas content under an oxygen ̄depleted state can inhibit explosion of CH4. But its inhibition effect gradually weakens as oxygen content increases until an oxygen ̄rich state is reached. Relative intensity of key radical emission spectra is basically consistent with corresponding changes of explosion pressure parameters. Although different radicals have the same change trend in participating in reaction processꎬ they are affected by oxygen content to different degreesꎬ and CH2O∗ꎬ compared with OH∗ꎬ is more susceptible to oxygen content during the process.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"1 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90345843","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}
引用次数: 1
Effective extraction radius of gas drilling in coal seam 煤层瓦斯钻井有效抽采半径
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.009
Zou Shichao, Xin Song
{"title":"Effective extraction radius of gas drilling in coal seam","authors":"Zou Shichao, Xin Song","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.009","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.009","url":null,"abstract":"In order to predict effective extraction radius of drilling hole in gas control of coal mineꎬ taking No. 6 coal seam of Sijichun mine in Guizhou Province as an exampleꎬ a gas seepage model of surrounding units of boreholes was established. Thenꎬ gas pressure distribution cloud chart along radial direction at different drilling time was obtained through Comsol numerical simulation. Finallyꎬ effective extraction radius was determined based on theoretical derivation and numerical simulation data while considering critical gas pressure (0􀆰 5 MPa)ꎬ and verification was made with on ̄site test. The results show that relative error rate of theoretical and simulated effective extraction radius is less than 10%ꎬ verifying accuracy of both calculation results. Effective radius is linearly dependent on extraction time. Considering its complexity to measure effective radius on siteꎬ it can be obtained through theoretical and numerical simulation methods used in this paperꎬ which provides a theoretical basis for underground gas control.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"135 1","pages":"53"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74878331","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}
引用次数: 5
Scenario analysis of stampede accidents in scenic spots 景区踩踏事故情景分析
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.017
L. Hua, Li Linqian, Yijing Peng
{"title":"Scenario analysis of stampede accidents in scenic spots","authors":"L. Hua, Li Linqian, Yijing Peng","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.017","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.017","url":null,"abstract":"In order to improve emergency management and control ability of huge crowds in scenic spotsꎬ a combination of scenario analysis and dynamic Bayesian network was used to study evolution process of stampede accidents. Situation stateꎬ disaster ̄causing bodyꎬ disaster ̄bearing body and driving factors were selected as key elements to explore law and path of accident scenario evolution. Thenꎬ the dynamic Bayesian network was used to construct a scenario network of huge crowd stampede incidentsꎬ and development trend of the scene was deduced by using situation state probability. The results show that scenarios with high risk of accidents are population fallꎬ crowd stalemateꎬ population flow increase and crowd gathering in turn. And the major reasons for them are interventions of corresponding driving factors such as inadequate preparation for preventionꎬ inadequate security management of scenic spotsꎬ imperfect human flow monitoring equipment and crowd diversion facilities.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"52 3 1","pages":"108"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77341779","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}
引用次数: 1
Simulation of personal evacuation in smoke scenario 烟雾情景下人员疏散模拟
中国安全科学学报 Pub Date : 2021-01-27 DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.014
L. Changhua, HE Haitong, L. Zhijie, Zhang Jie
{"title":"Simulation of personal evacuation in smoke scenario","authors":"L. Changhua, HE Haitong, L. Zhijie, Zhang Jie","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.014","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.014","url":null,"abstract":"In order to address the problem that people are greatly affected by real ̄time dynamic changes of smoke diffusion during evacuationꎬ an improved cellular automaton model is developed to simulate personnel evacuation in smoke scenario. Firstlyꎬ change rules for evacuees ' sight radius were proposed based on a dynamic parameter model to describe influence of smoke environment changes on their behaviorsꎬ and meanwhile movement rules of regional herd behaviors were established. Thenꎬ numerical simulation research on evacuation process in scenarios of single and double exits were conducted by using the model. Finallyꎬ impacts of visual field changesꎬ herd behaviors and width of exits on evacuation in smoke scene were analyzed. The results show that herd behaviors have uncertainty on evacuation in some casesꎬ and presence of guides can greatly improve evacuation efficiency. Changes of visual field have an impact on evacuation timeꎬ which is greater when number of evacuees is smaller. Increasing exit width can improve evacuation efficiencyꎬ but improvement is not obvious when the width reaches certain degree.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"78 1","pages":"86"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79086984","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}
引用次数: 0
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