China Safety Science Journal

Business interruption risk analysis based on fuzzy BN: a case study of flood disaster

SONG Yinghua, MA Lianlong, YANG Lijiao, JIANG Xinyu

2019, 29(6): 1-6. doi:10.16265/j.cnki.issn1003-3033.2019.06.001

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In order to identify the risk factors and estimate the probability of firms' inoperation caused by extreme heavy rain and flood disaster, 183 news reports of business interruption due to flood disaster since 2008 were analyzed, and a BN for business interruption based on the fault tree method was constructed. FST was adopted to reduce the uncertainty of database and to optimize fuzzy probability reasoning process. The sensitivity analysis was utilized to identify the key factors of business interruption. The results show that the business interruption risk of enterprises in China is 35.5% under the extreme heavy rain and flood disaster, and that the two main critical risk factors are water supply interruption and power supply interruption.

A calculation model for airlines' weather-related costs under disastrous weather conditions

LI Hang, GUO Xiaomei, HU Xiaobing

2019, 29(6): 7-12. doi:10.16265/j.cnki.issn1003-3033.2019.06.002

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In order to mitigate the impact of disastrous weather on airlines and improve their economic efficiency, this paper proposes a calculation model for airlines' weather-related costs. Firstly, the airlines' operating costs were reclassified into two categories: regular operating costs and weather-related costs. Then, weather-related costs for a flight under a given scenario was calculated by analyzing its cost in normal weather and abnormal flight status cost. The weather-related costs of one airline was obtained by summing up the costs of all flights, focusing on the reducible weather-related costs under disastrous weather conditions. Finally, a simulation case study of a medium-sized airline in China was carried out. The results show that the reduced weather-related costs of airlines can be calculated by the proposed model reasonably, and the weather-related costs are closely linked with the weather hazard degree of departure and arrival airports of planned flights.

Study on concept of safety

WEI Junjie, WANG Ge, LIU Mingju

2019, 29(6): 13-18. doi:10.16265/j.cnki.issn1003-3033.2019.06.003

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In order to give a more scientific definition of safety, combining the basic hypothesis of bounded rationality of human beings in economics, the whole emergence feature of the system science, and the objectivism and constructivism in epistemology, the attributes and characteristics of safety were thoroughly analyzed from four dimensions of basic hypothesis, system theory, epistemology and restrictive conditions. A new definition of safety was proposed: safety is a state in which a system is protected from unacceptable risks in a given context. Based on this, the connotation and extension of the new safety definition were analyzed. The results show that the essence of safety is risk acceptability, that the safety research is to find a method to determine the acceptable risk and establish acceptable risk criteria which conform to the national conditions of China, and that in the process of research, we should take the system as the research object, establish a suitable bounded rationality model, and takes into account the influence of social construction factors.

Development and demonstration of pedestrian traffic safety culture scale on urban streets

LIU Qing, NIAN Lufa

2019, 29(6): 19-24. doi:10.16265/j.cnki.issn1003-3033.2019.06.004

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In order to evaluate the status quo of pedestrian traffic safety culture on urban roads, a design method of evaluation scale was proposed. Firstly, on the basis of identifying the connotation of pedestrian traffic safety culture on urban streets, the preliminary scale was formed with reference to relevant literatures, and citizens in Wuchang District of Wuhan City were selected to test and empirically study the scale. Then 11 items were deleted by discriminant analysis, correlation analysis, exploratory factor analysis and confirmatory factor analysis. Finally, through empirical research, it's found that the system, behavior, and material and cultural level of urban pedestrian traffic safety were weak. The results show that the final scale with 4 dimensions and 21 items is credible and effective, and that it provides basis for the assessment of pedestrian traffic safety culture in urban streets and has the application and promotion value in the field of traffic safety culture.

Research progress and scientific development model of safety culturology

WANG Bing, WU Chao

2019, 29(6): 25-31. doi:10.16265/j.cnki.issn1003-3033.2019.06.005

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The paper aims to clarify the major fields, existing problems and developing trend of safety culturology researches, explore the scientific development model of safety culturology, and promote the research and development of safety culturology. The research progress and scientific development model were studied. The typical stages and major fields of safety culturology researches were reviewed, and a brief comment on existing researches was given. The results show that the existing safety culturology researches can be roughly divided into three stages and mainly involve the upstream research, midstream research and downstream research, and that the “Horizontal-Vertical” model for safety culturology development established in this paper can provide a clear framework for future research and development of safety culturology.

Quantitative study on accumulative effects of continuous high temperature weather on human physiological stress

ZHENG Guozhong, LI Ke

2019, 29(6): 32-36. doi:10.16265/j.cnki.issn1003-3033.2019.06.006

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In order to quantify the accumulative effect of continuous high temperature weather on the physiological stress of human body, a field experiment was conducted with ten healthy college students being selected as subjects and three consecutive days of which the was larger than 35℃ were maximum outdoor temperature considered as continuous high temperature condition, meanwhile the physiological parameters of the subjects under non air-conditioned indoor environment were also measured. Then the changes in these parameters within the three days were analyzed through paired T-test to verify the presence of accumulative effect. Finally, the daily maximum temperatures of the three days were corrected by utilizing the temperature correction model and thus the cumulative effect was quantified. The results indicate that the continuous high temperature exerts an unfavorable accumulative effect on systolic blood pressure, rectal temperature and mean skin temperature, and the cumulative effect coefficient of the second day on the third day is larger than that of the first day on the third one, the ranking of the coefficients goes as mean skin temperature > systolic blood pressure > rectal temperature.

Correlation study of airline pilots' psychology of risk and flight operation

WANG Lei, DONG Chuanting, YANG Xingyue, ZHANG Jingyi

2019, 29(6): 37-42. doi:10.16265/j.cnki.issn1003-3033.2019.06.007

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In order to examine the composition of airline pilots' psychology of risk and its impacts on flight operation, a method of mental measurement and cluster classification was proposed from three dimensions including risk tolerance, attitude towards risks and risk perception. Based on FOQA standard and flight data, the flight operation evaluation index system and model were developed, which integrated feature parameters of different phases-take off, initial climb, approach and landing. The psychological perception of 27 pilots was clustered into three grades: low, medium and high. Then, QAR data of 50 random flights performed by pilots in each grade were collected and analyzed by using the flight operation evaluation model. The results indicate that airline pilots' psychology of risk is correlated with their operation proficiency. Those with low grade psychology of risk possess relatively high operation skills while the flight operation skill of high grade pilots is the worst, and it is concluded that the lower grade the psychology of risk is, the better the flight operation skill will be.

Research on fall prediction method for elderly at home based on SVM

MA Yingnan, LYU Ziyang, GAO Xing, WANG Yongyi

2019, 29(6): 43-48. doi:10.16265/j.cnki.issn1003-3033.2019.06.008

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In order to reduce the falls of the elderly, the kinematics data from 54 elderly people were collected in the laboratory. Taking the thoracic spine, knee, scapula and pelvis as the research objects, and the average displacement of joint points in sagittal plane, coronal plane and cross-section as the feature dimension, the prediction model was constructed, and the SVM algorithm was applied to indentify and predict elderly people who are likely to fall. By comparing the data, the minimum dimension that can achieve higher prediction accuracy was obtained. The results show that the prediction accuracy of the proposed model is 87.5% when the parameters of SVM are optimized by particle swarm optimization(PSO)and genetic algorithm(GA), and that the same prediction accuracy can be achieved by establishing three dimensions through pelvic position.

Spatial and temporal distribution and causes analysis of accidents in hazardous chemicals enterprises based on accident fatality elasticity and cloud model

ZHOU Jiangtao, ZHANG Junpeng

2019, 29(6): 49-55. doi:10.16265/j.cnki.issn1003-3033.2019.06.009

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In order to objectively reflect the safety degree of a certain area, the accident death elasticity index and cloud model were applied to explore the spatial and temporal distribution and the causes of accidents in hazardous chemicals enterprises. Fatality elasticity was established on the basis of the existing statistical indicators as a new evaluation index. Cloud model was used to investigate the uniformity and stability of spatial and temporal distribution of accidents in Shandong province from 2000 to 2011. Finally, the direct cause of accidents was analyzed statistically based on the space-time scale. The results show that in the temporal dimensions, accident severity in April is the highest and its distribution shows great instability, the lowest in June, and the distribution of accident severity is the most stable in December, that in the spatial dimensions, the uneven and unstable distribution of accident severity is the largest in Southwest Shangdong, and the unevenness of accident severity in centralis small and stable, and that flammable and explosive chemicals are the main cause of accidents, and operational errors and neglect of safety and warning are the main unsafe act.

Systematic model of construction accident causation and its empirical analysis

ZHANG Wei, ZHU Shuangna, ZHANG Xiao, ZHAO Tingsheng

2019, 29(6): 56-62. doi:10.16265/j.cnki.issn1003-3033.2019.06.010

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In order to prevent and reduce construction accidents, a method combining accidents statistical analysis and the typical accident analysis was put forward to find out the critical causes of construction accidents. Firstly, a construction accident causation system model was built based on system thinking and accident causation theory, which contains six subsystems, 16 factors, and 39 sub-factors. Then the investigation reports of 812 accident cases from 2005 to 2017 in China were collected and causes of them were analyzed and counted. According to that, 39 sub-factors of accident causes were divided into four severity levels: critical, important, secondary, and normal. Finally, a collapse accident of Fengcheng power plant project in Jiangxi Province in 2016 was used as a case study to verify the effectiveness of the model. The results show that workers' wrong actions, inadequate safety inspection and safety engineer's mismanagement are three critical causes of construction accidents, which should be paid more attentions to and controlled.

Simulation of spatial conflict during cross operation in dam construction

CHEN Shu, YUAN Yue, TIAN Ya, ZHOU Jiali

2019, 29(6): 63-69. doi:10.16265/j.cnki.issn1003-3033.2019.06.011

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In order to prevent accidents in dam construction, the variation of the influence space of the cable crane was analyzed by decomposing the transporting process of the cable crane. According to the size of the roller compacted concrete dam storehouse surface, the number of rolling strips were calculated and the changing characteristics of the working space of the compactor were discussed. The overlapping area between the impact space of the cable crane and the working space of the compactor was analyzed and the spatial conflict strength was calculated. Besides, the implicit time correlation and the frequency of spatial conflict were calculated, and a simulation method of spatial conflict was proposed to comprehensively express the spatial conflict. The results show that this method can provide detailed data for builders before construction, and provide theoretical support to establish reasonable construction scheme and improve construction safety.

Study on parameter sensitivity in accident reconstruction model for car-pedestrian collision

WANG Qingping, QIAN Yubin, FENG Hao, MA Minghui, LI Wei

2019, 29(6): 70-75. doi:10.16265/j.cnki.issn1003-3033.2019.06.012

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In order to determine the sensitivity of each parameter in the car and pedestrian accident reconstruction system, nine parameters were extracted by PC-Crash software, and the orthogonal test was designed. The sensitivity ranking of parameters affecting the stop position of car and pedestrian was obtained by grey relational analysis, and according to whether the ranking results are used or not, a real car-pedestrian collision accident were reconstructed twice to verify the credibility and reliability of test results. The results show that parameters that have a significant impact on the reconstruction results are the vehicle speed, pedestrian speed, steering angle of car steering wheel during collision, the direction of the car in collision, and the friction coefficient between human body and the ground, and that by adjusting these parameters in a targeted manner, the final position error of each participant can be significantly reduced, and the speed of accident reconstruction and its fitting degree with the actual accident can be improved.

Smoke movement and control of fire in deep buried metro station with long passages

MAO Jun, XI Yanhong, HU Jiapeng, ZHU Lan, LIN Zhenyao, CAI Yu

2019, 29(6): 76-82. doi:10.16265/j.cnki.issn1003-3033.2019.06.013

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In order to determine the reasonable mode and parameters of smoke exhaust in the case of fire in a new type of separated metro station, the deep-buried metro station whose station hall and platform is connected by a long escalator channel was taken as the research object, and the numerical simulation was used to analyze the smoke movement process and its prevention and control methods in different areas of the station and escalator passages when the fire occurred. The results show that the smoke exhaust of the platform area fire needs to adopt the reasonable matching operation mode between the station and the tunnel fan, that the fire in the lobby floor and the long passage only needs to open the smoke exhaust fan of the hall to make the wind speed of the stairs reach the critical wind speed requirement, and that the proposed smoke exhaust mode and parameters are applicable to the fire smoke prevention and exhaust design of this type of station.

Evaluation of domino effect in fire accidents in storage tank area based on graph model

PAN Shihao, DOU Zhan, LI Yang, SHI Li

2019, 29(6): 83-89. doi:10.16265/j.cnki.issn1003-3033.2019.06.014

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In order to quantify the accident risk caused by domino effect of fire accidents in the crude oil storage tank area, a graph-based domino effect evaluation algorithm was developed which considers both the probabilities of primary fire and its probability of subsequent events. Firstly, the accident tree method was used to calculate the expected number of primary fire accidents in the tank. Then the graph model was constructed with the storage tanks in which primary fire occurs as nodes and the probable fire expansion directions as edges. Afterwards, the Bayesian networks presenting the fire expansion of each node were build based on the abovementioned graph model. Finally, the Bayesian network was used to calculate the total expectation of each node's accidents under the domino effect, and the proposed algorithm was applied to evaluate the domino effect in a crude oil tank farm. The results show that compared with the expected value of accidents considering only a single storage tank, the total expected value of accidents in some storage tanks is increasing significantly after considering the domino effect of accidents in surrounding storage tanks, and that the domino effect should not be ignored in accident risk assessment.

Fire risk assessment of northeast forest lumberyards based on improved matter-element extension method

GENG Zhiwei, XUE Wei, WANG Haibin, ZHANG Huachao, GUO Deyu

2019, 29(6): 90-96. doi:10.16265/j.cnki.issn1003-3033.2019.06.015

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To promote lumberyards' fire prevention ability and reduce fire incidence, the improved matter-element extension method is used to evaluate the fire risk in northeast forest lumberyards. Firstly, a fire risk evaluation index system of northeast forest lumberyards was established from personnel, equipment, combustible, environment and management perspectives, which contains five primary indicators and sixteen secondary indexes. Then a matter-element extension model of fire risk assessment of northeast forest lumberyards was set up on the basis of the hierarchical structure of lumberyard fire risk index with quantitative fuzziness taken into consideration so as to complete the fire risk evaluation. The example analysis results show that the improved matter-element extension method can be applied to the fire risk rating of northeast forest lumberyards, and the danger of single fire risk index can be directly expressed with improved radar chart, thus promoting the visualization of fire prevention management and providing theoretical basis for safe production and scientific management of lumberyards.

Development of muscular fatigue for workers in intermittent static pulling task

YI Cannan, TANG Fan, LI Kaiway, HU Hong, ZUO Huali, WANG Yuxin

2019, 29(6): 97-103. doi:10.16265/j.cnki.issn1003-3033.2019.06.016

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In order to explore features of the development of muscular fatigue in intermittent static pulling task and the difference between it and continuous static pulling task, and to reduce the accumulation of muscular fatigue and risk of getting work-related musculoskeletal disorders, a pulling task was designed and 8 male college students were recruited to participate in the experiment. Then the force (F) and RPE at different time over different ratio of work and rest were measured and analyzed by statistical method. The results show that F curves were almost the same over experiments with different ratio of work and rest during intermittent static pulling task, that values of F and RPE at the end of each trial show insignificant difference, that remarkable differences were found in some RPE over time period and body parts, that there were distinct differences between intermittent and continuous static pulling task and the accumulation of muscular fatigue in intermittent task was much slower than that of continuous task, that it was suggested that pulling task be arranged according to ratios of work and rest in this study, and that workers should adopt intermittent static force application for man-handling static work to reduce the accumulation of muscular fatigue.

A rapid determination method for aging curve of polymer matrix composites

FU Huimin, WEI Yian, WEN Xinlei

2019, 29(6): 104-108. doi:10.16265/j.cnki.issn1003-3033.2019.06.017

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In order to address the issue of long duration and high cost of aging tests for polymer matrix composites, a three-parameter exponential model for strength decline stage of aging curve was established by investigating the regularity of aging curves. A rapid determination method for aging curve of polymer matrix composites was proposed and it was then verified by simulations and real applications. The results show that the complete aging curve of strength decline can be obtained by this method with the test data from fast decline stage, or adding a little of test data from slow decline stage. The obtained aging curve can approach the true value, or be more conservative, which is safe and useable in engineering, and compared with the traditional approach, it can reduce about two thirds of test time and costs.

Research on permeability enhancement of coal seam by compound perforation technology

ZHAO Dan, LI Bin, LEI Yun, PAN Jingtao

2019, 29(6): 109-115. doi:10.16265/j.cnki.issn1003-3033.2019.06.018

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In order to increase the permeability of low permeability and high gas seam and improve gas utilization and extraction efficiency, a composite perforation blasting technology was proposed. Based on the theories of elastic mechanics and fracture mechanics, the crack strength factor and the crack secondary propagation radius equation of composite perforated detonation gas fracturing crack were established respectively, and the mechanism of coal rock fracture expansion was studied. FLAC^3D finite difference simulation software was used to analyze the effect of different lengths of cracks in blasting borehole on the effect of blasting and penetration. Industrial tests were carried out to compare the effects of underground composite perforation blasting and conventional pre-splitting blasting, and the gas extraction radius of coal seam after pre-splitting was determined by the variation characteristics of gas permeability. The results show that the gas permeability of coal seam after compound perforation blasting is significantly higher than that of conventional deep hole pre-splitting blasting and the effective radius can reach 5 m, and that the numerical simulation and field test prove that the gas permeability of coal seam can be effectively increased and the extraction rate can be improved by using compound perforation blasting.

Traffic safety assessment of highway workzone based on traffic conflict

JIANG Ruoxi , ZHU Shunying , WANG Lei , WANG Pan , WANG Hong , KUANG Shiping

2019, 29(6): 116-121. doi:10.16265/j.cnki.issn1003-3033.2019.06.019

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In order to solve the problem that the accuracy of current traffic conflict data collection method is not high and the outcome severity of traffic conflict is not considered, the typical highway workzone (subgrade stage) was selected as the research object, high-precision regional vehicle operation videos were captured by high-altitude unmanned aerial vehicle, and continuous vehicle microdata were obtained through video and conflict recognition program. Based on the theory and process of vehicle collision, the outcome severity of traffic conflict model was derived and the index of traffic conflict severity rates was used to assess traffic safety. The results show that traffic volume and large truck rate have a significant impact on the traffic conflict severity, that when the traffic volume is less than 700 pcu/h, the conflict severity is low, that when the traffic volume exceeds 900 pcu/h, the conflict severity increases rapidly, that the higher the large truck rate is, the higher the conflict severity will be, and that the traffic safety in highway workzone can be improved by diverting traffic volume and large trucks through traffic organizations.

Application of electromagnetic method in magnetic memory testing of buried pipelines

LI Zhongji, LI Changjun, CHENG Tingting, HE Yufa

2019, 29(6): 122-127. doi:10.16265/j.cnki.issn1003-3033.2019.06.020

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In order to improve the accuracy of magnetic memory testing of buried pipelines and reduce the interference of external factors on magnetic memory signals, the effect of electromagnetic method on buried pipelines' magnetic memory is studied by using enhanced magnetic memory detection technology. Firstly, based on the analysis of the magnetization principle of pipelines, the change of magnetization intensity along with that of external magnetic fields was analyzed. Then, a computational model for the gradient modulus of magnetic induction intensity applied to buried pipelines by electromagnetic method was established, and the influence of current on gradient modulus of magnetic induction intensity was analyzed. Finally, the electromagnetic method was used in the magnetic memory testing of some buried pipelines, and its testing results were compared with the results under the geomagnetic field. The results show that the growth rate of pipelines' magnetization intensity is larger under the geomagnetic field, and the application of electromagnetic method can strengthen pipelines' magnetization and increase magnetic induction gradient modulus of the defect, which can highlight the characteristics of the magnetic memory signal at the defect and suppress the influence of interference factors, therefore improving the magnetic memory testing sensibility of buried pipelines.

Research on interval time of traffic violations for bus drivers and its influencing factors

WANG Xiaoyong, LUO Shen, REN Jie, ZHU Tong

2019, 29(6): 128-133. doi:10.16265/j.cnki.issn1003-3033.2019.06.021

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In order to strengthen the management of bus drivers' violations of traffic rules, their time of violations and gender, driving age, education background and other personal characteristics data were collected. The non-parametric analysis method and the Cox regression analysis method were used to study the differences in the interval time of different bus drivers'violations and factors affecting the drivers' interval time of violations based on survival analysis. The results show that 50% of bus drivers' interval time is greater than 65 days, that in terms of education level, drivers with junior high school background have the longest interval time of violations, that in terms of gender, the interval time of violations for female drivers is similar to that for male, that in terms of driving age, drivers with driving age greater than 20 years have the longest interval time of violations, and that factors that have a significant effect on the drivers' interval time of violations are education background and driving age, while gender have no significant effect on drivers' interval time of violation.

Analysis of mitigation effect of longitudinal ribs on stay cable

BI Jihong, QIAO Haoyue, GUAN Jian, WANG Jian

2019, 29(6): 134-139. doi:10.16265/j.cnki.issn1003-3033.2019.06.022

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This paper is presented in order to study the mitigation mechanism of longitudinal ribs on rain-wind-induced vibration. Firstly, a theoretical vibration model of stay cables with kinetic rivulet which could be used for different aerodynamic shapes was established. Then the coupled water film oscillation and cable vibration equations were deduced. Finally, the theoretical model was used to study cable vibration response, water film features and changes of aerodynamic lifts and drags of stay cables with different longitudinal ribs. The results show that longitudinal ribs could suppress the formation of upper rivulet, and the increase of longitudinal ribs number could reduce the occurrence of rain-wind-induced vibration; the mitigation effect will be the best when the stay cable is installed with 12 longitudinal ribs since the dominant frequency of water film will deviate from the inherent frequency of stay cables, thus reducing the amplitude of crosswind while ensuring the drag coefficient is small and the amplitude of stay cable is decreased, the mitigation effect is the best.

Teaching model and effect evaluation of safety engineering discipline under idea of new engineering

TONG Ruipeng, MA Xiaofei, LI Jing, XU Surui, AN Yu, FU Gui

2019, 29(6): 140-145. doi:10.16265/j.cnki.issn1003-3033.2019.06.023

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In order to match the teaching model of safety engineering discipline with the new engineering idea, the social demand for safety professionals and the requirements of new engineering construction for teaching mode reform of safety engineering specialty were analyzed. Then combining with the characteristics of safety engineering and problems existing in the teaching process, the teaching model of safety engineering discipline under the new engineering concept was constructed from the aspects of teaching objectives, curriculum system and teaching methods. Finally, the teaching effect evaluation index system was constructed by analytic hierarchy process method, and it was compared with some other effect evaluation systems of successful teaching models both at home and abroad. The results show that the cultivation of core competence of safety engineering professionals is the guidelines and requirements for the construction of teaching mode of safety engineering specialty in the new period, and that the new curriculum system, diversified teaching methods and teaching effect evaluation system are the important parts of constructing teaching mode.

Risk analysis of human error in civil aircraft assembly process based on HFACS

SONG Zhihong, GENG Xiuli

2019, 29(6): 146-151. doi:10.16265/j.cnki.issn1003-3033.2019.06.024

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In order to solve the uncertainty of human error risk assessment in the process of civil aircraft manufacturing in China, an improved HFACS model was presented. Firstly, the FMEA were used to assess the risk of human error in the process of civil aircraft assembly, and an improved HFACS model was proposed in combination with the common human factors proposed by the International Civil Aviation Organization (ICAO). The improved HFACS model was used as the evaluation basis of the occurrence and difficulty of man-made errors. Then the rough set method was applied to deal with the uncertainty in information evaluation. The risk of human error was evaluated and sorted by using Preference Ranking Organization Method for Enrichment Evaluations II (PROMETHEE II) method, so as to set the priority of improvement. Finally, the risk of human error in the process of civil aircraft assembly was analyzed to verify the proposed method. The results show that the proposed method is effective and reliable and can provide a reasonable basis for human error risk assessment of civil aircraft manufacturing enterprises.

Risk assessment algorithm of crowd crushing and trampling in crowd-gathered place

WANG Baoyun, WANG Ting, ZHANG Lingli, HU Li

2019, 29(6): 152-157. doi:10.16265/j.cnki.issn1003-3033.2019.06.025

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In order to measure the trampling risk of crowds gathering places, a 4-variable risk assessment algorithm based on minimum width, slope, convergence and length was constructed. Firstly, the algorithm divides the accident HRSes into point-type nodes (PN), line-type nodes (LN) and surface-type nodes (SN). Then a risk measure function based on 4-variables was built to calculate risk values of the three kinds of nodes. Finally, the overall risk of the site was calculated according to the distribution of HRSes and the risk of each node. The results show that the proposed model can accurately identify the high-risk ENs and reasonably evaluate the overall trampling risk distribution of the site based on the quantitative calculation of the danger degree of three types of nodes.

Study on signal analysis technology of tank acoustic emission testing

SHEN Shuqian, LI Wei

2019, 29(6): 158-164. doi:10.16265/j.cnki.issn1003-3033.2019.06.026

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In order to improve the accuracy of post-test evaluation of tanks by non-expert inspectors and comprehensively analyze those common types of noise, an acoustic emission signal processing method based on wavelet analysis and pattern recognition was proposed The experiment of Q235B three-point bending sandpaper rub, rubber handle percussion and electric noise was designed, and the experimental data of new acoustic emission waveform feature analysis were collected to obtain different kinds of signal characteristics. Finally, the large sample data was cluster analyzed to distinguish different types of sound sources based on the proposed signal processing method and the new feature quantity. The results show that the proposed method can quantitatively reflect the sudden burst of acoustic emission waveforms and identify the signal type of acoustic emission; it is also found to be able to extract typical features of valid acoustic emission signals and preserve key frequency band wavelet coefficients to reconstruct waveforms, thus making it suitable for acoustic emission testing of tanks.

Lightning warning model based on multiple real-time monitoring data

PANG Huaji, ZHANG Yuanyuan, SONG Lin

2019, 29(6): 165-170. doi:10.16265/j.cnki.issn1003-3033.2019.06.027

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In order to improve the accuracy and timeliness of lightning prewarning, a real-time lightning warning system is established based on the monitoring information of atmospheric electric field, lightning location and weather radar. Firstly, a lightning warning model was built according to the changing rule of atmospheric electric field. Secondly, the warning algorithms of these three kinds of data were designed separately, and the reasonable warning thresholds were selected. Finally, lightning warning information was sent accurately to the customers who were located in the warning grids through targeted sending technology. Results show that the integrated model of multiple data with the reasonable setting of warning threshold,the fully automatic operation of the system and the targeted sending technology of information can improve the effect of lightning prewarning, it is also find that the systems is able to send out lightning warning 5-30 minutes ahead through several tests of thunderstorm process.

Multi-place and multi-scenario emergency exercise based on scenario-building

ZHENG Dengfeng, FU Mingfu, GONG Xiaofeng, ZHU Xiaoman, TAN Bo

2019, 29(6): 171-176. doi:10.16265/j.cnki.issn1003-3033.2019.06.028

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In order to prevent safety incidents and respond to emergencies, a comprehensive multi-scenario government and enterprise emergency exercise mode is put forward. First, based on the scenario-building technology, scenarios were set up for different incidents in multiple places, and the organization of exercise activities was established. Secondly, a task list was made and five working groups with clear division of works were established under the leading group of the exercise. Then, support and risk control measures were proposed and the exercise was conducted and evaluated in a "double blind" manner. Finally, this mode was applied to the emergency exercise of a pipeline company. The results show that the mode demonstrates strong operability as it adopts the "scenario-task-capability" technical route, and compared with the traditional exercise it makes the exercise more difficult with the increase of accident scenes, but reflects the performance of participants in a more realistic way.

Identification of key nodes in transportation network with node failure in natural disasters

CHEN Si, DENG Xiaozhen

2019, 29(6): 177-183. doi:10.16265/j.cnki.issn1003-3033.2019.06.029

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For the sake of improving the efficiency of emergency rescue organization and operation of transportation network under natural disasters, key nodes in transportation network were identified. PageRank and Warshall were combined to establish a key node identification algorithm for each stage based on random failure of nodes, and greedy strategy was used to predict key nodes in transportation network based on the premise of maximum damage of natural disasters. The critical transportation network in Wenchuan earthquake was taken as an example to validate the proposed algorithm. The results show that the algorithm has a good recognition effect on the accessibility nodes and isolated nodes of the network under the condition of taking into account the uncertainty of natural disasters, and that it can detect the key nodes of the transportation network dynamically in real time and provide a theoretical basis for material transportation and personnel evacuation in the rescue process.

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