Research on Tunnel Interior Zone Luminance Evaluation Method and its Application

2013 ◽  
Vol 779-780 ◽  
pp. 929-934
Author(s):  
Jing Bi Hu ◽  
Da Guo ◽  
Xiao Qin Zhang
Keyword(s):  
South China ◽  
Evaluation Method ◽  
Operating Speed ◽  
Safe Operation ◽  
Luminance Threshold ◽  
Traffic Environment ◽  
Interior Zone ◽  
Driver Workload ◽  
Driving Workload ◽  
Driving Fatigue

Because of the special traffic environment, the tunnel is called a bottleneck on the highway sections; there is a huge risk of safe operation. Tunnel interior zone lighting plays an important role in the tunnel; good lighting can eliminate depression and driving fatigue of the driver in the tunnel. In this paper, freeway tunnel interior zone lighting is as the research object. We analyzed the driver's demand for freeway tunnel interior zone lighting and transformed illumination to luminance in the model of driver workload, operating speed and the illumination. And this model is established by our group. According to comfortable and relatively comfortable driving workload intense threshold, we can get the safe and comfortable luminance threshold of tunnel interior zone. This paper proposed a detection and evaluation method in freeway tunnel interior zone luminance, and the method have been applied and verified on one freeway in south China.

Research of Pipeline Weld Detection Based on Magnetic Memory Technology

2014 ◽  
Vol 940 ◽  
pp. 222-225
Author(s):  
Fei Fei Long ◽  
Jian Zeng Wang ◽  
Li Li ◽  
Jun Ru Zhao
Keyword(s):  
Strain State ◽  
Evaluation Method ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Safe Operation ◽  
Long Distance ◽  
Peak Period ◽  
Detection Evaluation ◽  
Metal Magnetic Memory Method ◽  
Testing Work

Ensuring the safe operation of pipeline and monitoring it to prevent sudden accidents are an important task of current nondestructive testing work because of our country is in the peak period of long-distance pipeline construction. Welding cracks are common and most dangerous flaw in the root of the failure of the welded joints . Metal magnetic memory method is the only viable detection , evaluation method currently used for diagnosing the stress-strain state of serving welding crack in the early stages. So this article designs weld cracks of the general pipeline, establish a method to detect pipeline weld crack by metal magnetic memory method.

scholarly journals Automated Visual Recognizability Evaluation of Traffic Sign Based on 3D LiDAR Point Clouds

2019 ◽  
Vol 11 (12) ◽  
pp. 1453 ◽  
Author(s):  
Shanxin Zhang ◽  
Cheng Wang ◽  
Lili Lin ◽  
Chenglu Wen ◽  
Chenhui Yang ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Laser Scanning ◽  
Large Scale ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Point Clouds ◽  
Traffic Sign ◽  
Traffic Signs ◽  
3D Point Clouds ◽  
Traffic Environment

Maintaining the high visual recognizability of traffic signs for traffic safety is a key matter for road network management. Mobile Laser Scanning (MLS) systems provide efficient way of 3D measurement over large-scale traffic environment. This paper presents a quantitative visual recognizability evaluation method for traffic signs in large-scale traffic environment based on traffic recognition theory and MLS 3D point clouds. We first propose the Visibility Evaluation Model (VEM) to quantitatively describe the visibility of traffic sign from any given viewpoint, then we proposed the concept of visual recognizability field and Traffic Sign Visual Recognizability Evaluation Model (TSVREM) to measure the visual recognizability of a traffic sign. Finally, we present an automatic TSVREM calculation algorithm for MLS 3D point clouds. Experimental results on real MLS 3D point clouds show that the proposed method is feasible and efficient.

Assessment of Urban Railway Transit Driver Workload and Fatigue under Real Working Conditions

2019 ◽  
Vol 2673 (11) ◽  
pp. 891-900
Author(s):  
Yuan-chun Huang ◽  
Lan-peng Li ◽  
Zhi-gang Liu ◽  
Hai-yan Zhu ◽  
Lin Zhu
Keyword(s):  
Reaction Time ◽  
Working Conditions ◽  
Night Shift ◽  
Driving Mode ◽  
Autonomous Mode ◽  
Driver Workload ◽  
Driving Workload ◽  
Significant Regression ◽  
Time Changes ◽  
Fatigue Driving

This paper describes an experiment conducted to establish a workload model by employing physiological methods to measure driver workload and fatigue under real working conditions. Experienced healthy metro drivers were selected as subjects; they performed normal schedules during which simultaneous electrocardiogram (ECG) recording was used to assess their levels of fatigue. Then, subjective workload assessment and reaction time tests were conducted during each break interval to monitor the drivers’ physiological and psychological performance. Based on task analysis, driving workload models with time weight parameters of four types of tasks were established and the workload real-time changes during different shifts were evaluated. The results demonstrate that workload tends to increase over time and it is significantly higher during manual driving mode than autonomous mode ( p = 0.015 < 0.05). Driving fatigue occurs earlier in the night shift than in the day shift according to ECG spectrum analysis results. Although the results of reaction time tests show no significance ( p = 0.917 > 0.05), the increase in the number of reaction errors after fatigue driving indicates a reduction in drivers’ cognitive ability. Regression analysis shows a significant regression relationship with a mutual incentive effect between workload and fatigue in three shifts ( R2 > 0.4). These will be used as a future reference for fatigue research and to help develop reasonable schedules to ensure operational safety.

Risk Assessment of Relay Protection Setting Value in Power Plant

2013 ◽  
Vol 373-375 ◽  
pp. 1345-1348 ◽  
Author(s):  
Zong Jiang Mu ◽  
Yan Xu ◽  
Shao Bo Yan
Keyword(s):  
Risk Assessment ◽  
Power Plant ◽  
Potential Risk ◽  
Risk Evaluation ◽  
Evaluation Method ◽  
Relay Protection ◽  
Stable Operation ◽  
Protection Device ◽  
Safe Operation ◽  
Risk Assessment And Analysis

Power plant relay protection setting value of the hidden harm causes of relay protection device is not correct, safe and stable operation of the power plant. In this paper, from the angle of the safe operation of power plant, the hidden danger to plant with the protection setting is studied and then the risk evaluation method of power plant relay protection setting values of hidden trouble is proposed. From the power plant relay protection setting value considering two aspects of probability and consequences of potential outbreak of different values, value potential risk is considered, and of a certain power plant in Hubei was made the risk assessment and analysis, in order to verify the theoretical rationality and accuracy.

Health Evaluation for Durability of Harbor Engineering in South China Based on AHP

2013 ◽  
Vol 842 ◽  
pp. 489-493 ◽  
Author(s):  
Zheng Chen ◽  
Xi Li ◽  
Jia Yi Chen ◽  
Yu Liu Wei ◽  
Fei Xu ◽  
...  
Keyword(s):  
South China ◽  
Evaluation Method ◽  
Chloride Concentration ◽  
Health Evaluation ◽  
Analytic Hierarchy ◽  
Existing Structures ◽  
Practical Engineering ◽  
Chloride Penetration Resistance ◽  
Hierarchy Process ◽  
Degree Of Reinforcement

Considering the corrosion degree of reinforcement, the chloride penetration resistance of concrete and chloride concentration distribution in concrete, a health evaluation method for durability of harbor engineering was established by analytic hierarchy process (AHP). Analysis of a harbor in South China demonstrates that the health indicator for durability condition of existing structures can be effectively used to quantitatively health evaluation for durability of practical engineering.

Safety Evaluation of Freeway Alignment Case Analysis

2013 ◽  
Vol 779-780 ◽  
pp. 939-945
Author(s):  
Jiang Bi Hu ◽  
Xiang Zheng Chang ◽  
Jian Ping Cao
Keyword(s):  
Heart Rate ◽  
Healthy Adult ◽  
Safety Evaluation ◽  
Case Analysis ◽  
Truck Drivers ◽  
Operating Speed ◽  
Road Design ◽  
Driver Workload ◽  
Accident Data ◽  
Variability Index

Variation of driver workload degree on freeway was analyzed in order to research safe and comfort of alignment and provide a new technical support for humanization road design. A total of 12 healthy adult drivers heart rate variability index and operating speed are tested on 77 sections of one mountainous freeway. According to the change law of different drivers workload degree on different alignment conditions,4 sections cant meet the expectations of the truck drivers safe and comfort. In addition, accident data is used to verify the dangerous sections. Research results can be applied to design road alignment that meets the driving expectations of different drivers.

Electrochemical Evaluation Method for Soil Corrosion Properties in Grid Substation

2013 ◽  
Vol 295-298 ◽  
pp. 811-814 ◽  
Author(s):  
Feng Pei ◽  
Jing Fu ◽  
Fa Yuan Wu ◽  
Lei Jing Wang ◽  
Xiao Lei Liu ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Power Grids ◽  
Corrosion Mechanism ◽  
Safe Operation ◽  
Corrosion Properties ◽  
Corrosion Failure ◽  
Soil Corrosion ◽  
Grounding Grids ◽  
Soil Corrosivity ◽  
Electrochemical Evaluation

Soil corrosion is the main reason of corrosion failure for substation grounding grids. To explore electrochemical evaluation method for soil corrosion of substation grounding grids would effectively ensure the safe operation of power grids. This paper discussed the main several kinds of soil corrosive electrochemical research methods and application. These methods played an important role on researching soil corrosion mechanism, soil corrosivity and corrosion behavior.

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