scholarly journals Influence of Arc Size on the Ignition and Flame Propagation of Cable Fire

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5675
Author(s):  
Chenying Li ◽  
Jie Chen ◽  
Wei Zhang ◽  
Libing Hu ◽  
Jingying Cao ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Flame Propagation ◽  
3D Model ◽  
Arc Discharge ◽  
Gas Temperature ◽  
Safe Operation ◽  
Xlpe Cable ◽  
Equivalent Impedance ◽  
Cable Fire ◽  
First Time

Cable fire caused by arc faults is one of the essential factors threatening the safe operation of a power system. The ignition and flame propagation of cable fire dependent on the characteristics of the arc discharge is lackingin in-depth understanding at present. In this work, with the constant electric power deposited into the arc discharge, the effects of arc size on the ignition and flame propagation of 110 kV XLPE cable fire are investigated for the first time. The arc size is changed by varying the gap distance of electrodes from 1.5 cm to 2.5 cm. It is interesting to find that the larger the arc size is, the faster the cable fire is ignited and propagates, and the larger the damaged area of the sheath of the cable is. Therein, when the gap distance increases from 1.3 cm to 3.1 cm, the equivalent impedance and the length of the arc discharge increase nearly seven times and three times, respectively. However, the gas temperature of the arc decreases slightly from 2280 K to 2100 K. In addition, a 3D model of the cable fire ignited by arc discharge is computed by Pyrosim software with fire dynamic simulation (FDS) module. Simulated results show that as the arc size increases, the cable fire is ignited faster, the flame propagates both vertically and horizontally increasing significantly, which is agreed well with the experimental results. This study deepens the understanding of the cable fire ignited by arc discharge and therefore it is useful for the evaluation and prevention of cable fire.

Experimental and numerical investigations on novel models for mechanical behaviors of the elastic ring in aero-engine

2021 ◽  
pp. 095440622110130
Author(s):  
Zhong Luo ◽  
Lei Li ◽  
Yang Yang ◽  
Xiaojie Hou ◽  
Jiaxi Liu ◽  
...  
Keyword(s):  
3D Model ◽  
Maximum Stress ◽  
Simple Structure ◽  
Experimental Testing ◽  
Axial Direction ◽  
Elastic Ring ◽  
Load Range ◽  
Aero Engine ◽  
Stiffness Characteristics ◽  
First Time

The elastic ring is widely used in elastic support structures of aero-engine because of its simple structure and convenient manufacturing. In this paper, two elastic ring models, 3D and 2D models, are proposed, where the fillets between the bulges and ring are considered. The 2D model is more efficient for the calculation of stiffness characteristics. The 3D model can be used to obtain the maximum stress position in the axial direction. Then the experimental testing is carried out to verify the accuracy and effectiveness of the proposed models. Based on the proposed models, the stiffness nonlinearity and critical load of the elastic ring are found for the first time, which can be used to determine the normal working load range. Moreover, the elastic ring models with and without fillets are developed, and the effect of the fillets on stress is discussed. The results show that the stress is reduced by considering the fillets, which are not considered in the existing literature.

scholarly journals UNDERWATER PHOTOGRAMMETRY DIGITAL SURFACE MODEL (DSM) OF THE SUBMERGED SITE OF THE ANCIENT LIGHTHOUSE NEAR QAITBAY FORT IN ALEXANDRIA, EGYPT

2019 ◽  
Vol XLII-2/W10 ◽  
pp. 1-8 ◽  
Author(s):  
M. Abdelaziz ◽  
M. Elsayed
Keyword(s):  
3D Model ◽  
Low Cost ◽  
Data Gathering ◽  
Archaeological Site ◽  
3D Models ◽  
Surface Model ◽  
Digital Surface Model ◽  
Architectural Elements ◽  
3D Photogrammetry ◽  
First Time

<p><strong>Abstract.</strong> Underwater photogrammetry in archaeology in Egypt is a completely new experience applied for the first time on the submerged archaeological site of the lighthouse of Alexandria situated on the eastern extremity of the ancient island of Pharos at the foot of Qaitbay Fort at a depth of 2 to 9 metres. In 2009/2010, the CEAlex launched a 3D photogrammetry data-gathering programme for the virtual reassembly of broken artefacts. In 2013 and the beginning of 2014, with the support of the Honor Frost Foundation, methods were developed and refined to acquire manual photographic data of the entire underwater site of Qaitbay using a DSLR camera, simple and low cost materials to obtain a digital surface model (DSM) of the submerged site of the lighthouse, and also to create 3D models of the objects themselves, such as statues, bases of statues and architectural elements. In this paper we present the methodology used for underwater data acquisition, data processing and modelling in order to generate a DSM of the submerged site of Alexandria’s ancient lighthouse. Until 2016, only about 7200&amp;thinsp;m<sup>2</sup> of the submerged site, which exceeds more than 13000&amp;thinsp;m<sup>2</sup>, was covered. One of our main objectives in this project is to georeference the site since this would allow for a very precise 3D model and for correcting the orientation of the site as regards the real-world space.</p>

Study on Experiment Modeling of Human-Gun System

2014 ◽  
Vol 644-650 ◽  
pp. 2137-2142
Author(s):  
Jian Wang ◽  
Yan Liu ◽  
Zhi Guang Zhang ◽  
Zhan Jiang Yu ◽  
Bao Gui Wang ◽  
...  
Keyword(s):  
Parameter Identification ◽  
Dynamic Simulation ◽  
Test Data ◽  
Main Part ◽  
3D Model ◽  
Quality Test ◽  
High Quality ◽  
Model Parameter ◽  
Interaction System ◽  
Experiment Method

A new kind of human-imitate shooting platform is needed, so that the automation and standardization of small arm experiment could be realized. And the main part of shooting platform design is the modeling of human-gun interaction system. The main object of this paper is modeling human-gun interaction system by testing the model of the system. Firstly, the testing scheme is promoted for testing interaction between gun and human shoulder, and high quality test data is collected. Then, the model parameter of human-gun system is calculated by the method of model parameter identification. 3D model of human-gun system is built. At last, the dynamic simulation is made by ADAMS. And human-gun model built by experiment method is verified.

scholarly journals Improving the efficiency of power boilers by cooling the flue gases to the lowest possible temperature under the conditions of safe operation of reinforced concrete and brick chimneys of power plants

2018 ◽  
Vol 245 ◽  
pp. 07014 ◽  
Author(s):  
Evgeny Ibragimov ◽  
Sergei Cherkasov
Keyword(s):  
Reinforced Concrete ◽  
Power Plant ◽  
Flue Gas ◽  
Power Plants ◽  
Thermal Power ◽  
Operating Mode ◽  
Flue Gases ◽  
Technical Solution ◽  
Gas Temperature ◽  
Safe Operation

The article presents data on the calculated values of improving the efficiency of fuel use at the thermal power plant as a result of the introduction of a technical solution for cooling the flue gases of boilers to the lowest possible temperature under the conditions of safe operation of reinforced concrete and brick chimneys with a constant value of the flue gas temperature, when changing the operating mode of the boiler.

scholarly journals A Magnetohydrodynamic Model of Galaxy Formation

1997 ◽  
Vol 163 ◽  
pp. 797-798
Author(s):  
J. P. Sleath ◽  
A. H. Nelson
Keyword(s):  
Active Galactic Nuclei ◽  
Galaxy Formation ◽  
3D Model ◽  
Galactic Nuclei ◽  
Preliminary Results ◽  
Magnetohydrodynamic Model ◽  
The Creation ◽  
First Time

AbstractWe present a full 3D model of galaxy formation, incorporating for the first time magnetohydrodynamical effects. By this means we hope to simulate the creation of active galactic nuclei, including jets. Preliminary results are encouraging.

Dynamic Simulation of the Stack-Manipulator to Aluminum-Ingot Based on ADAMS

2014 ◽  
Vol 541-542 ◽  
pp. 700-703
Author(s):  
Da Wei Xu ◽  
Hai Tao Wu ◽  
Hong Bin Liu ◽  
Jia Cheng Cai ◽  
Tian Chang Yao
Keyword(s):  
Control System ◽  
Angular Velocity ◽  
Research And Development ◽  
Dynamic Simulation ◽  
3D Model ◽  
Scientific Basis ◽  
Aluminum Ingot

On the research and development of the Stack-Manipulator to Aluminum-Ingot, the Stack-Manipulator 3D model was established by using SolidWorks and imported into ADAMS via the interface between them. And then the authors got the torque and angular velocity curves after adding the driving and constraints. Finally, this paper chose the servo motors by using the simulated results. The results provide a reliable and scientific basis for the development of the control system.

A Study on Effects of Gear Backlash on Differential Vibration

2014 ◽  
Vol 945-949 ◽  
pp. 730-734
Author(s):  
Jin Li Xu ◽  
Peng Wei ◽  
Feng Yun Huang ◽  
Hong Jun Wang
Keyword(s):  
Dynamic Analysis ◽  
Mechanical System ◽  
Dynamic Simulation ◽  
3D Model ◽  
Contact Forces ◽  
Planetary Gears ◽  
Time Dynamic ◽  
Gear Backlash ◽  
Impact Theory ◽  
Simulation Results

Based on UG and Automatic Dynamic Analysis of Mechanical System (ADAMS), the 3D model of differential was constructed and the real-time dynamic simulation of differential was achieved. The effects of gear backlash between half axle gears and planetary gears on the vibration of differential are studied. To increase the credibility of simulation results , the contact forces between half axle gears and planetary gears were calculated based on the Hertz elasticity impact theory.

scholarly journals A STUDY OF CO-PLANING TECHNOLOGY OF SPACEBORNE, AIRBORNE AND GROUND REMOTE SENSING DETECTING RESOURCE, DRIVEN BY DISASTER EMERGENCY TASK

2018 ◽  
Vol XLII-3 ◽  
pp. 2147-2151
Author(s):  
F. Yu ◽  
H. Chen ◽  
K. Tu ◽  
Q. Wen ◽  
J. He ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Dynamic Simulation ◽  
Disaster Response ◽  
Major Disaster ◽  
Key Technologies ◽  
Different Types ◽  
Disaster Monitoring ◽  
Disaster Chain ◽  
First Time ◽  
Workflow Tasks

Facing the monitoring needs of emergency responses to major disasters, combining the disaster information acquired at the first time after the disaster and the dynamic simulation result of the disaster chain evolution process, the overall plan for coordinated planning of spaceborne, airborne and ground observation resources have been designed. Based on the analysis of the characteristics of major disaster observation tasks, the key technologies of spaceborne, airborne and ground collaborative observation project are studied. For different disaster response levels, the corresponding workflow tasks are designed. On the basis of satisfying different types of disaster monitoring demands, the existing multi-satellite collaborative observation planning algorithms are compared, analyzed, and optimized.

scholarly journals Charge transfer in steam purified arc discharge single walled carbon nanotubes filled with lutetium halides

2020 ◽  
Vol 22 (18) ◽  
pp. 10063-10075
Author(s):  
Ana Santidrián ◽  
Magdalena Kierkowicz ◽  
Elzbieta Pach ◽  
Denisa Darvasiová ◽  
Belén Ballesteros ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Electronic Properties ◽  
Arc Discharge ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Effect Of Doping

In the present work, the effect of doping on electronic properties in bulk purified and filled arc-discharge single-walled carbon nanotubes samples is studied for the first time by in situ Raman spectroelectrochemical method.

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