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Wei Y.,Beijing Urban Construction Design and Development Group Co. | Lin S.,North China University of Technology | Chu R.,North China University of Technology | Tian Q.,North China University of Technology | Fei W.,China Aerospace Science and Technology Corporation
Procedia Engineering | Year: 2016

This paper summarizes the classification method of domestic subway station, and points out the existing defects. In order to design of a relatively reasonable grading system, this paper reference to the existing classification method and passenger flow data. First, obtain a dynamic correction of parameters according to the static factors. Then, combine with the data of dynamic flow to determine the level of the station. © 2016 The Authors. Published by Elsevier Ltd. Source

Yang D.,Beijing Institute of Technology | Yang D.,Beijing Urban Construction Design and Development Group Co. | Ren W.,University of California at Riverside | Liu X.,Beijing Institute of Technology | Chen W.,Xidian University
Automatica | Year: 2016

In this paper, the event-triggered consensus problem is studied for multi-agent systems with general linear dynamics under a general directed graph. Based on state feedback, we propose a decentralized event-triggered consensus controller (ETCC) for each agent to achieve consensus, without requiring continuous communication among agents. Each agent only needs to monitor its own state continuously to determine when to trigger an event and broadcast its states to its out-neighbors. The agent updates its controller when it broadcasts its states to its out-neighbors or receives new information from its in-neighbors. The ETCC can be implemented in multiple steps. it is proved that under the proposed ETCC there is no Zeno behavior exhibited. To relax the requirement of continuous monitoring of each agent's own states, we further propose a self-triggered consensus controller (STCC). Simulation results are given to illustrate the theoretical analysis and show the advantages of the event-triggered and self-triggered controllers proposed in this paper. © 2016 Elsevier Ltd. All rights reserved. Source

Yu Y.,Beijing Urban Construction Design and Development Group Co. | Liu X.,Chongqing Jiaotong University | Zhang X.,Chongqing Jiaotong University
Modern Tunnelling Technology | Year: 2014

When the bench method is used for the excavation of a multi-arch loess tunnel, steel rib support and backfill support are commonly used for the temporary support of the middle pilot heading. Using the Qingliangsi multi-arch tunnel on the Taiyuan-Jiaxian Expressway as an example, a comparative analysis of overall elastic-plastic simulation was carried out for those two kinds of supporting methods in order to select the most logical temporary support. The results show that the steel rib and backfill supporting methods have the same supporting effects on the surface displacement, crown settlement, and bolt axial force, and both of them can meet the requirements for tunnel deformation. However, the support provided by steel ribs in terms of the surrounding rock stress, initial support stress, and bolt axial force is better than that provided by the backfill support. Source

Zhai W.,Southwest Jiaotong University | Yang J.,China Railway Eryuan Engineering Group Co. | Li Z.,Southwest Jiaotong University | Han H.,Beijing Urban Construction Design and Development Group Co.
Wind and Structures, An International Journal | Year: 2015

A numerical model for analyzing air-train-track interaction is proposed to investigate the dynamic behavior of a high-speed train running on a track in crosswinds. The model is composed of a train-track interaction model and a train-air interaction model. The train-track interaction model is built on the basis of the vehicle-track coupled dynamics theory. The train-air interaction model is developed based on the train aerodynamics, in which the Arbitrary Lagrangian-Eulerian (ALE) method is employed to deal with the dynamic boundary between the train and the air. Based on the air-train-track model, characteristics of flow structure around a high-speed train are described and the dynamic behavior of the high-speed train running on track in crosswinds is investigated. Results show that the dynamic indices of the head car are larger than those of other cars in crosswinds. From the viewpoint of dynamic safety evaluation, the running safety of the train in crosswinds is basically controlled by the head car. Compared with the generally used assessment indices of running safety such as the derailment coefficient and the wheel-load reduction ratio, the overturning coefficient will overestimate the running safety of a train on a track under crosswind condition. It is suggested to use the wheel-load reduction ratio and the lateral wheel-rail force as the dominant safety assessment indices when high-speed trains run in crosswinds. Copyright © 2015 Techno-Press, Ltd. Source

Tian Q.,North China University of Technology | Lin S.,North China University of Technology | Wei Y.,Beijing Urban Construction Design and Development Group Co. | Fei W.W.,China Aerospace Science and Technology Corporation
Advances in Energy, Environment and Materials Science - Proceedings of the International Conference on Energy, Environment and Materials Science, EEMS 2015 | Year: 2016

In this paper, combined with the existing algorithm of human detection and the depth camera, a human detection system under the Android system was set. Depth information and color information of the scene can be obtained by depth camera. According to depth information and threshold segmentation method, the area of head and shoulder is determined. Then the histogram of oriented gradient is extracted from the head and shoulder region. And the support of vector machine is used to classify and identify the target. © 2016 Taylor & Francis Group, London. Source

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