Implementing a Digital Twin of an Underground Utility Tunnel for Geospatial Feature Extraction Using a Multimodal Image Sensor

Lee, Jae‐Wook; Lee, Yong-Hwan; Park, Sangmi; Hong, Chang-Hee

doi:10.3390/app13169137

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…τ S = 2008.011v −1.3328 d −2.901 ϕ o 0.287 (7) The application limits of the model are 1 ≤ v ≤ 5, 0.5 ≤ d ≤ 1.5, and 5 ≤ ϕ o ≤ 25. In the design of gas tunnel, the scientific and reasonable exhaust velocity and equivalent diameter of the vent can be calculated through the given alarm removal time.…”

Section: Ventilation Durationmentioning

confidence: 99%

“…Due to the flammable and explosive characteristics of natural gas, the establishment of gas tunnels has been controversial all over the world [4,5]. If a leakage accident occurs in the gas tunnel, i.e., an urban underground closed structure, the consequences are very serious [6][7][8]. As the only channel for gas exchange inside and outside the gas tunnel, the ventilation system is the key to avoid accidents under abnormal conditions [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Zhang,

Lan

2023

Applied Sciences

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The ventilation system is the only channel for gas exchange inside and outside the gas tunnel, which determines whether the high-risk gas in the tunnel can be exhausted in time after a gas leakage accident; thus, it is essential to study the dynamic ventilation characteristics. A fire-retarding division of the gas tunnel in Songjiang District of Shanghai is taken as the study object, and, based on the similarity theory, a similarity experiment platform is built. The simulation experiments of exhaust are carried out under different exhaust velocities, ventilation equivalent diameters and initial gas concentrations by using the control variable method. The changes in ventilation duration and gas concentration are analyzed in detail. The conclusions are as follows: (1) Time–concentration curves at all positions in the gas tunnel exhibit an “asymptote” distribution. (2) Average gas concentration has a linear relationship with time at the beginning and becomes an exponential relationship after a certain time. (3) When the exhaust velocity is 5 m/s, the initial gas concentration is 15%VOL; when the equivalent diameter of the vent in the model is 0.2 m, the ventilation duration is 100.2 s. A calculation model of ventilation duration for the standard gas tunnel is established, and the application limits of the model are 1 ≤ v ≤ 5, 0.5 ≤ d ≤ 1.5, and 5 ≤ φo ≤ 25. (4) In practical engineering, an exhaust velocity of 5 m/s and an equivalent ventilation diameter of 1 m are relatively optimal ventilation parameters.

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Section: Ventilation Durationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Zhang,

Lan

2023

Applied Sciences

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Multi-object extraction technology for complex background based on faster regions-CNN algorithm in the context of artificial intelligence

Peng

2024

SOCA

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A digital twin model of urban utility tunnels and its application

Jiansong,

chen,

Yanzhu

et al. 2024

digitaltwin

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Background Multiple pipelines in utility tunnels may lead to various accidents and serious social impact. In the era of digitalization, how to better model the operation of a utility tunnel, dynamically predict the accident evolutions, and support corresponding decision-makings are essential issues. Methods In this study, a CFD-based digital twin framework for accidents in utility tunnels is proposed. First, Kalman filtering is applied to correct the parameter drift of sensors used for long-term monitoring. A data interaction system is then developed based on Internet of Things (IOT) and OPC Unified Architecture (OPC UA) to comprehensively manage data transmission within the utility tunnel. Subsequently, a natural gas leakage prediction model is developed to enable the efficient prediction of the spatial and temporal distribution in the case of leakage. Finally, these components are integrated for visualization in a digital twin platform for natural gas leakage in utility tunnels. Additionally, numerical simulations are employed to validate of the proposed method. Results The utility tunnel data transmission system based on IoT and OPC UA proposed in this paper is case-validated. By comparing the simulation results at 10 s, 20 s, 30 s, and 40 s, the model accurately predicts the methane concentration at the leak position after 10 seconds and maintains acceptable accuracy thereafter. The simulation results of different cases are introduced to verify the reliability of the risk indicator proposed in this paper, which increases with the leakage rate. Finally, A process for visualizing numerical simulation is proposed into a digital twin. Conclusions The proposed predictive digital twin technology facilitates the rapid risk assessment of and emergency management of natural gas accidents in utility tunnels. Based on the results of predictive model, a risk indicator is introduced to evaluate the natural gas accidents.

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Implementing a Digital Twin of an Underground Utility Tunnel for Geospatial Feature Extraction Using a Multimodal Image Sensor

Cited by 8 publications

References 30 publications

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Multi-object extraction technology for complex background based on faster regions-CNN algorithm in the context of artificial intelligence

A digital twin model of urban utility tunnels and its application

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