Research of Urban Rail Transit Vehicle Aluminum Alloy Bolster FSW Welding Technology Based on Thermal-Mechanical Coupling

2018 ◽  
Vol 773 ◽  
pp. 208-213 ◽  
Author(s):  
Ying Shi Sun
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Rapid Development ◽  
Engineering Application ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Mechanical Coupling ◽  
Friction Stir ◽  
Welding Technology ◽  
Urban Rail

With the rapid development of urban rail transit and the increasing level of research and development, aluminum alloy materials feature excellent physical and mechanical properties, and thus an urban rail transit vehicle adopts aluminum alloy materials. Friction Stir Welding (FSW) technology is adopted in the production process of a bolster in this article and research of stress strain of friction stir welding parts plays an important role for engineering application of friction stir welding technology.

Design for Urban Rail Transit Energy Efficiency Management System

2013 ◽  
Vol 749 ◽  
pp. 629-633
Author(s):  
Jian Bin Ye ◽  
Zhi Yan Ding ◽  
Qi Zhu
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Management System ◽  
Rapid Development ◽  
Chinese Economy ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Service Architecture ◽  
Urban Rail ◽  
Emission Reduction Strategies

With the rapid development of Chinese economy and the speeding up urbanization, urban rail transit has entered a rapid development period, which results in more and more energy consumption. Meanwhile affected by energy source and environment factors, the state has implemented energy-saving emission reduction strategies in various fields, so energy efficient management for urban rail transit becomes more important. Based on the analysis of energy consumption problems in urban rail transit, the paper designs urban rail transit energy efficiency management system from the aspects of overall architecture, service architecture and application function, and provides technical support for the realization of the software system.

Adaptive Spectrum Management of Cognitive Radio in Intelligent Transportation System

2015 ◽  
Vol 743 ◽  
pp. 765-773 ◽  
Author(s):  
Cheng Wu ◽  
Y.M. Wang ◽  
Xiang Qiang ◽  
Z.Y. Zhang
Keyword(s):  
Cognitive Radio ◽  
Ad Hoc ◽  
Intelligent Transportation System ◽  
Environmental Changes ◽  
Rapid Development ◽  
Spectrum Management ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Value Functions ◽  
Urban Rail

With the rapid development of urban rail transit, the demand of the public in rail transportationto take real-time, reliable and efficient wireless access services, has become the focus of mobilebroadband communications. Wireless cognitive radio (CR) over urban rail transit is a newly emergingparadigm that attempts to opportunistically transmit in licensed frequencies, without affecting the preassignedusers of these bands. To enable this functionality, such a radio must predict its operationalparameters, such as transmit power and spectrum. These tasks, collectively called spectrum management,is difficult to achieve in a dynamic distributed environment, in which CR users may only takelocal decisions, and react to the environmental changes. In this paper, we propose a reinforcementlearning based approach for spectrum management. Our approach uses value functions to evaluate thedesirability of choosing different transmission parameters, and enables efficient assignment of spectrumsand transmit powers by maximizing long-term reward. We then investigate various real-worldscenarios, and compare the communication performance using different sets of learning parameters.The results proves our reinforcement learning based spectrum management can significantly reduceinterference to licensed users, while maintaining a high probability of successful transmissions in acognitive radio ad hoc network.

Effect of Welding Parameters on AA8090 Al-Li Alloy FSW T-Joints

2013 ◽  
Vol 554-557 ◽  
pp. 985-995 ◽  
Author(s):  
Enrico Lertora ◽  
Chiara Mandolfino ◽  
Carla Gambaro
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
High Strength ◽  
Welding Parameters ◽  
T Joints ◽  
Friction Stir ◽  
High Strength Aluminum Alloy ◽  
Welding Technology

In aeronautics and aerospace construction, whenever a seam is needed between aluminum alloy parts, riveting, nailing or bolting are the preferred methods of junction. Friction stir welding technology has made possible the realization of high strength aluminum alloy joints, which are normally considered non-weldable with conventional welding techniques.

Research and Design of Network System for LIM Rail Transit Vehicle

2012 ◽  
Vol 253-255 ◽  
pp. 2086-2090
Author(s):  
Ning Zi Cheng ◽  
Yao Hua Li ◽  
Qiong Xuan Ge ◽  
Rui Hua Zhang ◽  
Ke Wang
Keyword(s):  
Engineering Application ◽  
Cost Effective ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Network System ◽  
Transit System ◽  
Linear Induction Motor ◽  
Urban Rail ◽  
Programmable Logical Controller ◽  
Research And Design

The new linear induction motor (LIM) driven urban rail transit system is favored for more rapidly and reliability, cost-effective and environmental friendly. As the core of the LIM vehicle, network system is proposed in this paper. The scheme of network system is given by using Beckhoff programmable logical controller and its sub-modules, and CANopen protocol is applied in network communication. The performance of the network system is demonstrated by the experiment results. The research and design can be a useful guidance to engineering application for future LIM urban rail transit construction in China.

Design and Implementation of Mobile Client for Passenger Dynamic Travel Information Enquiry in Urban Rail Transit Network

2014 ◽  
Vol 571-572 ◽  
pp. 502-506
Author(s):  
Qin Luo ◽  
Guan Di Ye ◽  
Jia Zhi Yang ◽  
Yi Kui Mo
Keyword(s):  
Rapid Development ◽  
Smart Phone ◽  
Mobile Internet ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Mobile Client ◽  
Travel Choice ◽  
Travel Information ◽  
Client Software ◽  
Urban Rail

With rapid development and popularity of smart phone and mobile internet, mobile client software (APP) is widely used in every aspect of daily life. To improve the informatization and intellectualization of Urban Rail Transit passenger services, the paper brings forward a method of optimal travel choice for passengers based on “dynamic travel time”(hereinafter to be referred as DTT), and also takes advantage of the Android platform to develop an APP for dynamic travel information enquiry. The structure of the APP and the key problems to be resolved during the development process are introduced. As the APP is applied into practice, it can provide passengers with effective support.

Urban Rail Transit Types and Single Wire on the Propagation Law of Delays

2016 ◽  
Vol 835 ◽  
pp. 763-766
Author(s):  
Dong Xue Zhang ◽  
Yan Hui Wang ◽  
Ya Fei Wang
Keyword(s):  
Rapid Development ◽  
Recursive Formula ◽  
Urban Rail Transit ◽  
Living Standard ◽  
Rail Transit ◽  
Urban Rail ◽  
Propagation Law ◽  
Politics And Culture ◽  
Several Delays

Along with our country, a steady and rapid development of economy, politics and culture, the traffic also got rapid development with the trend. The improvement of people's living standard in our country, more and more frequent transportation also emerged, the requirement for the quality of travel people also put forward higher requirements; Therefore, as a responsible for the daily commuter traffic tools, urban rail transit train delay problem should give our attention. The types of urban rail traffic delay is described in this paper, including the initial delay and joint and several delays, and expounds the time characteristics and spatial characteristics of delays, and the urban rail transit delays was studied, on the single line shows the single delays the transmission of the recursive formula, for the delay of the urban rail transit emergency disposal provides theory basis.

scholarly journals An Innovative Approach to Determining High-Risk Nodes in a Complex Urban Rail Transit Station: A Perspective of Promoting Urban Sustainability

2018 ◽  
Vol 10 (7) ◽  
pp. 2456 ◽  
Author(s):  
Hui Xu ◽  
Liudan Jiao ◽  
Shulin Chen ◽  
Milan Deng ◽  
Ningxin Shen
Keyword(s):  
High Risk ◽  
Public Transportation ◽  
Public Safety ◽  
Rapid Development ◽  
Urban Sustainability ◽  
Urban Rail Transit ◽  
Innovative Approach ◽  
Rail Transit ◽  
Urban Rail ◽  
Transit Station

Public safety presents high importance in urban sustainable development. Transportation safety is a significant section in public safety. Over the last couple of decades, as a sustainable means of public transportation, urban rail transit presents a rapid development in China. Increasing initiatives and practices have been engaged with views to facilitating people’s travel and intensive utilizing land resources. Echoing this, rail transit stations with multi-floor structure have been built and show structure complexity. Due to this complexity, there is a need to focus on risk management for the stations to guarantee operation safety. Accordingly, this research introduces an innovative approach to identify high-risk nodes in the complex rail transit stations. The high-risk nodes are determined according to two aspects, which are the key nodes of the station and presenting large passenger volumes. Complex network analysis and field investigation were adopted in this study. The Lianglukou rail transit station in Chongqing, China was selected for case study. The research results in this study indicate that (1) in platform floors, stairs/escalators are almost high-risk nodes; (2) columns and metal fences that have been determined as high-risk nodes are located near stairs/escalators; (3) in concourse floor, the determined high-risk nodes present relative high degree centrality and low betweenness centrality compared with nodes in platform floor. The obtained high-risk nodes are helpful for the management firms to develop risk mitigation measures and re-allocate their resources to create a safe environment for passengers in the stations. The guarantee for the rail transit station operation safety plays an important role in enhancing urban sustainability.

scholarly journals A Resilience-Based Security Assessment Approach for CBTC Systems

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ruiming Lu ◽  
Huiyu Dong ◽  
Hongwei Wang ◽  
Dongliang Cui ◽  
Li Zhu ◽  
...  
Keyword(s):  
Rapid Development ◽  
Urban Rail Transit ◽  
Economic Losses ◽  
Rail Transit ◽  
Security Level ◽  
Continuous Exposure ◽  
Efficient Operation ◽  
Train Control ◽  
Urban Rail ◽  
Assessment Approach

With the rapid development of urban rail transit systems, large amounts of information technologies are applied to increase efficiency of train control systems, such as general computers, communication protocols, and operation systems. With the continuous exposure of information technology vulnerabilities, security risks are increasing, and information is easy to use by malicious attackers, which can bring huge property and economic losses. The communication-based train control (CBTC) system is the most important subsystem of urban rail transit. The CBTC system ensures safe and efficient operation of trains, so the quantitative assessment of cyber security is quite necessary. In this paper, a resilience-based assessment method is proposed to analyze the security level of CBTC systems based on indicators of both the cyber domain and the physical domain. The proposed method can demonstrate the robustness and recovery ability of CBTC systems under different security attacks. Based on the structural information entropy, the fusion of different indicators is achieved. Two typical attacking scenarios are analyzed, and the simulation results illustrate the effectiveness of the proposed assessment approach.

scholarly journals GROUND SUBSIDENCE ALONG SHANGHAI METRO LINE 6 BY PS-InSAR METHOD

2018 ◽  
Vol XLII-3 ◽  
pp. 1889-1893 ◽  
Author(s):  
J. Wu ◽  
M. Liao ◽  
N. Li
Keyword(s):  
Ground Deformation ◽  
Rapid Development ◽  
Vertical Direction ◽  
Urban Rail Transit ◽  
Displacement Rate ◽  
Rail Transit ◽  
Maximum Displacement ◽  
Envisat Asar ◽  
Urban Rail ◽  
Shanghai Metro

With the rapid development of urban economy, convenient, safe, and efficient urban rail transit has become the preferred method for people to travel. In order to ensure the safety and sustainable development of urban rail transit, the PS-InSAR technology with millimeter deformation measurement accuracy has been widely applied to monitor the deformation of urban rail transit. In this paper, 32 scenes of COSMO-SkyMed descending images and 23 scenes of Envisat ASAR images covering the Shanghai Metro Line 6 acquired from 2008 to 2010 are used to estimate the average deformation rate along line-of-sight (LOS) direction by PS-InSAR method. The experimental results show that there are two main subsidence areas along the Shanghai Metro Line 6, which are located between Wuzhou Avenue Station to Wulian Road Station and West Gaoke Road Station to Gaoqing Road Station. Between Wuzhou Avenue Station and Wulian Road Station, the maximum displacement rate in the vertical direction of COSMO-SkyMed images is −9.92 mm/year, and the maximum displacement rate in the vertical direction of Envisat ASAR images is −8.53 mm/year. From the West Gaoke Road Station to the Gaoqing Road Station, the maximum displacement rate in the vertical direction of COSMO-SkyMed images is −15.53 mm/year, and the maximum displacement rate in the vertical direction of Envisat ASAR images is −17.9 mm/year. The results show that the ground deformation rates obtained by two SAR platforms with different wavelengths, different sensors and different incident angles have good consistence with each other, and also that of spirit leveling.

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