Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Publication
- Publication Type
- File Type
Articles 1 - 8 of 8
Full-Text Articles in Engineering
Quantifying Correlations Between Winter Severity, Road Conditions, And Vtrans' Snow And Ice Control Activities: Final Report, Jonathan Dowds, James Sullivan, Mitchell Robinson
Quantifying Correlations Between Winter Severity, Road Conditions, And Vtrans' Snow And Ice Control Activities: Final Report, Jonathan Dowds, James Sullivan, Mitchell Robinson
University of Vermont Transportation Research Center
Season-to-season variability in winter weather and the absence of quantifiable methods for measuring either winter severity or snow and ice control (SIC) performance have made planning and budgeting for SIC activities challenging. Recent research initiatives undertaken by VTrans and other snowbelt DOTs have established objective measures for weather severity and SIC effectiveness, creating the opportunity to quantify the relationships among winter severity, SIC costs, and SIC performance. For this project, the research team utilized these recently established severity measures and VTrans SIC cost data from the MATS database to develop a cost estimation tool that projects expected SIC costs for …
Synthesis Of Technical Requirements And Considerations For Automated Snowplow Route Optimization: Final Report, Jonathan Dowds, James Sullivan
Synthesis Of Technical Requirements And Considerations For Automated Snowplow Route Optimization: Final Report, Jonathan Dowds, James Sullivan
University of Vermont Transportation Research Center
DOTs and other transportation agencies are increasingly using automated methods for snowplow route optimization, which have been demonstrated to produce significant savings when they result in the implementation of new routes. However, many route optimization projects have fallen short of implementation due to technical/operational issues with the routes produced or institutional barriers to change. These shortcomings can be substantially mitigated with improvements to the process of soliciting, selecting, and managing the route optimization software or service provider. This project’s objective was to provide DOTs with the tools needed to make these improvements. The key lessons from this project are provided …
Eco-Driving Systems For Connected Automated Vehicles: Multi-Objective Trajectory Optimization, Ke Huang, Xianfeng Yang
Eco-Driving Systems For Connected Automated Vehicles: Multi-Objective Trajectory Optimization, Ke Huang, Xianfeng Yang
Mineta Transportation Institute Publications
This study aims to leverage advances in connected automated vehicle (CAV) technology to design an eco-driving and platooning system that can improve the fuel and operational efficiency of vehicles during freeway driving. Following a two-stage control logic, the proposed algorithm optimizes CAVs’ trajectories with three objectives: travel time minimization, fuel consumption minimization, and traffic safety improvement. The first stage, designed for CAV trajectory planning, is carried out with two optimization models. The second stage, for real-time control purposes, is developed to ensure the operational safety of CAVs. Based on extensive numerical simulations, the results have confirmed the effectiveness of the …
To Improve The Coupon System For Monitoring Compliance With Labor Safety At The Enterprises Of Jsc "Uzbekistan Temir Yullari», Sunnatulla Sulaymanov, Miraziz Mirkadirovich Talipov, Аbdigofur Dustov
To Improve The Coupon System For Monitoring Compliance With Labor Safety At The Enterprises Of Jsc "Uzbekistan Temir Yullari», Sunnatulla Sulaymanov, Miraziz Mirkadirovich Talipov, Аbdigofur Dustov
Journal of Tashkent Institute of Railway Engineers
The article discusses the issues of improving the coupon system for monitoring compliance with labor safety by establishing the level of labor protection at work and ranking the violations committed by departments and the enterprise as a whole. A modernized structure of the labor protection management system has been developed and a coupon control system has been proposed, integrated with three-level monitoring of the conditions and labor protection, which takes into account the magnitude of the coefficient of labor protection.
Exact Controllability Of The Lazer-Mckenna Suspension Bridge Equation, Lanxuan Yu
Exact Controllability Of The Lazer-Mckenna Suspension Bridge Equation, Lanxuan Yu
UNLV Theses, Dissertations, Professional Papers, and Capstones
It is well known that suspension bridges may display certain oscillations under external aerodynamic forces. Since the collapse of the Tacoma Narrows suspension bridge in 1940, suspension bridge models have been studied by many researchers. Based upon the fundamental nonlinearity in suspension bridges that the stays connecting the supporting cables and the roadbed resist expansion, but do not resist compression, new models describing oscillations in suspension bridges have been developed by Lazer and McKenna [Lazer and McKenna (1990)]. Except for a paper by Leiva [Leiva (2005)], there have been very few work on controls of the Lazer-McKenna suspension bridge models …
Maritime Traffic Management: A Need For Central Coordination?, Fulko Van Westrenen, Gesa Praetorius
Maritime Traffic Management: A Need For Central Coordination?, Fulko Van Westrenen, Gesa Praetorius
Gesa Praetorius
Traffic management is not formally organised in the maritime domain. Ships are autonomous and find their own way. Traffic is organised through rules, regulations, and “good seamanship”; it is a distributed system. In areas of high traffic-density support is proved by vessel traffic service (VTS) to promote traffic safety and fluency. VTS does not take control. This organisational structure has proven itself in situations with sufficient resources. When resources become insufficient (e.g. not enough sailing space), the traffic needs an organising mechanism. In this article, the authors argue that the most promising way to do this is by organising centralised …
Situation Awareness And Maritime Traffic: Having Awareness Or Being In Control?, Fulko Van Westrenen, Gesa Praetorius
Situation Awareness And Maritime Traffic: Having Awareness Or Being In Control?, Fulko Van Westrenen, Gesa Praetorius
Gesa Praetorius
Situation awareness (SA) is generally seen as a mental representation of the system state, an objective measure of the ‘situation out there’. In this article, the authors make an argument that SA can only have a meaning in relation to the task of the user and characteristics of the system. This will be argued with the help of a specific environment: vessel traffic monitoring. The long-time constants and the complex constraints imposed on the ship require that the operator monitoring the traffic has a good SA: the operator must make long-term predictions about possible traffic developments. For this, being in …
Learning Lessons In Resilient Traffic Management: A Cross-Domain Study Of Vessel Traffic Service (Vts) And Air Traffic Control (Atc), Gesa Praetorius, Fulko Van Westrenen, Deborah Mitchell, Erik Hollnagel
Learning Lessons In Resilient Traffic Management: A Cross-Domain Study Of Vessel Traffic Service (Vts) And Air Traffic Control (Atc), Gesa Praetorius, Fulko Van Westrenen, Deborah Mitchell, Erik Hollnagel
Gesa Praetorius
Although younger than the maritime domain, aviation has had a huge impact on the system design and development within shipping. Stakeholders often look towards aviation to make shipping, and the way that traffic is handled and organised, safer, more efficient and more effective. Although legally not the same, Vessel Traffic Service (VTS) is frequently compared to Air Traffic Control (ATC). In this article the area of traffic management within the maritime and aviation domains is addressed from a Resilience Engineering perspective. Focus is placed on the arrival part of a mission. The comparison is based on information collected during two …