Expanded Uncertainty in Measurements of Vertical and Lateral Behaviors for the Rubber-Tired Light Rail Vehicle

2010 ◽  
Vol 452-453 ◽  
pp. 37-40
Author(s):  
Yeon Su Kim
Keyword(s):  
Ride Comfort ◽  
Light Rail ◽  
Lateral Vibration ◽  
Passenger Compartment ◽  
Expanded Uncertainty ◽  
The Public ◽  
Rail Vehicle ◽  
Transport Vehicle ◽  
Curved Track ◽  
Minimum Curvature

In the public transport vehicle, vertical and lateral behaviors have a significant effect on ride comfort and safety of passengers on curved track. Based on vertical and lateral vibration accelerations measured on floor level in passenger compartment when the K-AGT ran on the minimum curvature of the 2.4km-test track in driverless mode, expanded uncertainties in measurement were estimated statistically. In addition, vertical and lateral dynamic behaviors of the K-AGT were discussed in this paper.

Dynamic model for ride comfort evaluations of the rubber-tired light rail vehicle

2008 ◽  
Vol 46 (11) ◽  
pp. 1061-1082 ◽  
Author(s):  
Yeon-Su Kim ◽  
Tae-Keon Lim ◽  
Sung-Hyuk Park ◽  
Rag-Gyo Jeong
Keyword(s):  
Dynamic Model ◽  
Ride Comfort ◽  
Light Rail ◽  
Rail Vehicle

Traditional LRV Side-Load Requirements and Their Applicability to Low Floor Cars

2002 ◽  
Author(s):  
Wm. Murphy Madison ◽  
Jeffrey T. Lau
Keyword(s):  
Light Rail ◽  
Passenger Vehicle ◽  
Passenger Compartment ◽  
Rail Vehicle ◽  
Side Load ◽  
Light Trucks

The focus of this paper is to study the application of Light Rail Vehicle (LRV) side-load requirements to Low Floor LRVs (LF LRVs). Although the side-load requirements of LRVs are not completely consistent among different transit authorities, an industry pseudo-standard of 40,000 lbs applied over an 8 foot span at the side sill has emerged. In LF LRVs, this standard may not provide the same level of safety as in High Floor LRVs (HF LRVs). In some US automobiles, the bottom of the bumper is higher than the top of the floor in LF LRVs. Given comparable sidewall construction, when a passenger vehicle impacts the side of an LRV, the opportunity for intrusion/override into the passenger compartment in a LF LRV is higher than that in a HF LRV. The popularity of light trucks, SUVs, minivans and other vehicles with high bumper heights further aggravates this situation.

Vibration-Based Symptoms in Condition Monitoring of a Light Rail Vehicle

2012 ◽  
Vol 518 ◽  
pp. 409-417 ◽  
Author(s):  
Bartosz Firlik ◽  
Maciej Tabaszewski ◽  
Bogdan Sowinski
Keyword(s):  
Public Transport ◽  
Ride Comfort ◽  
Light Rail ◽  
State Monitoring ◽  
Experimental Phase ◽  
Rail Vehicle ◽  
European Cities ◽  
Operation And Maintenance ◽  
Rail Systems ◽  
Increasing Trend

Light rail systems have now their great return in many European cities carrying an increasing number of people every year. This increasing trend requires suitable operation and maintenance standards for both vehicle and track. Furthermore, in order to make a public transport competitive to private transport, its very important to increase safety and ride comfort for passengers. The aim of the presented work was to determine the suitable vibration-based symptoms for the identification of a light rail vehicle technical state, as well as the development of appropriate methodology to use the information contained therein. Both simulation and experimental phase are described. The present analysis is focused mainly on the suspension state monitoring, but some others failures were also considered.

Condition Monitoring System for Light Rail Vehicle and Track

2012 ◽  
Vol 518 ◽  
pp. 66-75 ◽  
Author(s):  
Bartosz Firlik ◽  
Bartosz Czechyra ◽  
Andrzej Chudzikiewicz
Keyword(s):  
Monitoring System ◽  
Condition Monitoring ◽  
Public Transport ◽  
Ride Comfort ◽  
Operating Conditions ◽  
Maintenance Cost ◽  
Light Rail ◽  
Main Concept ◽  
Rail Vehicle ◽  
Condition Monitoring System

Condition monitoring and fault detection systems are becoming increasingly important in rail vehicles maintenance and operation, ensuring safety and reliability improvement. Light rail systems are not the main target for this trend, because of low operational speed and lower safety factors. Nevertheless public transport operators begin to pay a closer attention to the technical state monitoring of vehicle and track, in order to reduce maintenance cost and increase safety and ride comfort for passengers, which is an important challenge for public transport competitiveness in XXI century. The paper describes the main concept of the innovative on-board condition monitoring system for light rail vehicle and track. Functional requirements, assumptions and procedures are described, as well as the on-board data acquisition unit with necessary transducers, which number, function and technical parameters were optimized during the research phase of the project. The prototype of the presented system is now being tested in normal operating conditions.

A simplified iterative approach for testing the pulse derailment of light rail vehicles across a viaduct to near-fault earthquake scenarios

2021 ◽  
pp. 095440972098741
Author(s):  
Ling-Kun Chen ◽  
Peng Liu ◽  
Li-Ming Zhu ◽  
Jing-Bo Ding ◽  
Yu-Lin Feng ◽  
...  
Keyword(s):  
Ground Motions ◽  
Simulation Software ◽  
Light Rail ◽  
Rail Transit ◽  
Light Rail Transit ◽  
Seismic Responses ◽  
Near Fault ◽  
Rail Vehicle ◽  
Pulse Type ◽  
The Impact

Near-fault (NF) earthquakes cause severe bridge damage, particularly urban bridges subjected to light rail transit (LRT), which could affect the safety of the light rail transit vehicle (“light rail vehicle” or “LRV” for short). Now when a variety of studies on the fault fracture effect on the working protection of LRVs are available for the study of cars subjected to far-reaching soil motion (FFGMs), further examination is appropriate. For the first time, this paper introduced the LRV derailment mechanism caused by pulse-type near-fault ground motions (NFGMs), suggesting the concept of pulse derailment. The effects of near-fault ground motions (NFGMs) are included in an available numerical process developed for the LRV analysis of the VBI system. A simplified iterative algorithm is proposed to assess the stability and nonlinear seismic response of an LRV-reinforced concrete (RC) viaduct (LRVBRCV) system to a long-period NFGMs using the dynamic substructure method (DSM). Furthermore, a computer simulation software was developed to compute the nonlinear seismic responses of the VBI system to pulse-type NFGMs, non-pulse-type NFGMs, and FFGMs named Dynamic Interaction Analysis for Light-Rail-Vehicle Bridge System (DIALRVBS). The nonlinear bridge seismic reaction determines the impact of pulses on lateral peak earth acceleration (Ap) and lateral peak land (Vp) ratios. The analysis results quantify the effects of pulse-type NFGMs seismic responses on the LRV operations' safety. In contrast with the pulse-type non-pulse NFGMs and FFGMs, this article's research shows that pulse-type NFGM derail trains primarily via the transverse velocity pulse effect. Hence, this study's results and the proposed method can improve the LRT bridges' seismic designs.

FACTORS INFLUENCING RIDERSHIP PREFERENCE IN USING LRT SERVICE IN KLANG VALLEY, MALAYSIA

2021 ◽  
Vol 19 (16) ◽  
Author(s):  
Rohayu Ab Majid ◽  
Rosli Said ◽  
Jamalunlaili Abdullah ◽  
Rohana Ngah ◽  
Qi Jie Kwong
Keyword(s):  
Light Rail ◽  
Negative Effects ◽  
Chi Square ◽  
The Public ◽  
Factors Influencing ◽  
Transportation Service ◽  
Design Attributes ◽  
Site Design ◽  
Klang Valley ◽  
Main Components

Light Rail Transit (LRT) is one of the public transports that provides a lot of benefits to the Malaysian. Yet this consumption depends on the diverse tastes of potential ridership which are influenced by various factors. However, it is very challenging to predict significant factors influencing ridership preferences. As such, the identification of these factors is very important in ensuring this transportation service really attract ridership attention. Thus, this paper intends to identify the main factors that influence ridership preference in taking LRT transportation. 28 attributes have been identified in this research which expands from four (4) main components. Data were collected from ridership’s survey, site observations and ridership statistical data. Pearson Chi-square has been employed to justify the significant status and the influence level of each LRT attribute and component factors toward ridership preference. The results show that 23 attributes recorded a significant status (<0.00) in two (2) different directions of correlation. Overall, three (3) component factors namely i) Comfortable Service, ii) Economics and iii) Indoor Environment Conditions, have influenced and contributed to the same effect on ridership considerations, as compared to the negative effects displayed by the Site Design Attributes.

Consistent Tangent Stiffness of a Three-Dimensional Wheel–Rail Interaction Element

2021 ◽  
Author(s):  
Quan Gu ◽  
Jinghao Pan ◽  
Yongdou Liu
Keyword(s):  
Finite Element ◽  
Quadratic Convergence ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Light Rail ◽  
Software Framework ◽  
Tangent Stiffness ◽  
Rail Vehicle ◽  
Interaction Element ◽  
Nonlinear Equations Of Motion

Consistent tangent stiffness plays a crucial role in delivering a quadratic rate of convergence when using Newton’s method in solving nonlinear equations of motion. In this paper, consistent tangent stiffness is derived for a three-dimensional (3D) wheel–rail interaction element (WRI element for short) originally developed by the authors and co-workers. The algorithm has been implemented in finite element (FE) software framework (OpenSees in this paper) and proven to be effective. Application examples of wheelset and light rail vehicle are provided to validate the consistent tangent stiffness. The quadratic convergence rate is verified. The speeds of calculation are compared between the use of consistent tangent stiffness and the tangent by perturbation method. The results demonstrate the improved computational efficiency of WRI element when consistent tangent stiffness is used.

scholarly journals Bifurcation analysis of 4-axle rail vehicle models in a curved track

2017 ◽  
Vol 89 (2) ◽  
pp. 863-885 ◽  
Author(s):  
Krzysztof Zboinski ◽  
Miroslaw Dusza
Keyword(s):  
Bifurcation Analysis ◽  
Rail Vehicle ◽  
Curved Track

The U.S. Standard Light Rail Vehicle-A Progress Report

1977 ◽  
Author(s):  
John M. Cord ◽  
Peter R. Norton
Keyword(s):  
Progress Report ◽  
Light Rail ◽  
Rail Vehicle ◽  
The U.S
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