Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 67 for “"Road Conditions"”.
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FORECASTING WINTER ROAD CONDITIONS: A DATA-DRIVEN APPROACH
… vehicle crashes happen on snowy, slushy, or icy roads in the United States. Accurate prediction of road surface temperatures and conditions is crucial for ensuring safe and efficient transportation, especially during winter. In this study, we developed machine learning and computer vision models …
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Federated learning-based 3D pothole detection, evaluation, and routing for smart transportation
Bad road conditions can cause vehicle damage and create hazardous driving conditions. Auto damages caused by potholes can add up to thousands of dollars per vehicle. Besides, pothole resolution is one of the most expensive street maintenance strategies. Most cities have established social data …
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Dynamic Learning and Human Interactions under the Extended Belief-Desire-Intention Framework for Transportation Systems
… used to accurately evaluate the performance of a road network considering individual and dynamic movements of vehicles under a virtual roadway environment. Given initial traffic demands and road conditions, the simulation is executed with multiple iterations and provides users with converged …
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Simulation analysis of anti-rollover mechanism for vehicles
… able to keep the vehicle stable under various road conditions and high speeds, to prevent the vehicle from rolling over and to maintain the stability for the vehicle by creating an anti-rolling torque on the vehicle body capable of turning the vehicle smoothly to stable position.
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A study to investigate whether speed and road conditionshave an effect on the physiological stability of sick and preterm babies undergoing inter-hospital transfer by ambulance
… this study was to investigate whether speed and road conditions have an effect on the physiological stability of sick and preterm babies undergoing inter-hospital transfer by ambulance. Study Design This was a quantitative observational study using primary data. The study compared the stability …
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Bio-mimicry of a Leopard Tortoise’ Shoulder Girdle in Space Frame Design of an Ambulance Body
… Africa (SSA). It is inferred that the road conditions have an influence on the availability, durability and affordability of motorized and non-motorized vehicles in rural areas. Also, it is deduced that locally modified bicycle and motorcycle ambulances are not conducive to maternal …
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Active Suspension Design Requirements for Compliant Boundary Condition Road Disturbances
… ride and handling depending on the operating conditions of a vehicle. Active suspensions are far more effective over a variety of different road conditions compared to passive suspension systems. This is because of their ability to store and dissipate energy at different rates. Additionally, …
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Detailed Haul Unit Performance Model
… associated with the haul unit, and the haul road conditions. Presently there is no travel time model that appropriately considers these factors and simulates the interactions among them such that more detailed analysis could be performed. Such a model needs to be developed. The objective of …
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Hybrid Friction Estimation based on Intelligent Tires and Vehicle Dynamics
… the interaction between the tires and the road surface. This knowledge gap significantly impacts the safety and control of the vehicle. Thus, to address this issue, this research introduces a novel fusion approach to estimate friction at the tire-road contact interface. This hybrid fusion …
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Stochastic Terrain and Soil Modeling for Off-Road Mobility Studies
… predictions of vehicle performance in off-road conditions, it is critical to incorporate in the simulation accurate representations of the variability of the terrain profile. It is not practically feasible to measure the terrain at a sufficiently large number of points, or, if measured, to …
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Road and Driver Monitoring System
In this work we present a driver and road monitoring system capable of scaling to the number of drivers in any region without incurring the high costs of implementation, thus allowing for safer driving conditions and shorter accident response times. We propose the Smartphone Road Monitoring (SRoM) …
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Censored Regression Models With Applications to Infrastructure Degradation Studies
… variable is bounded or censored. In these conditions, least squares methods are not appropriate, although they are widely used. This dissertation develops a generalization of the Tobit censored regression model using Student's t distribution instead of the normal. Thus additional …
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Spatial Analysis of Fatal Automobile Crashes in Nashville, TN, 2001-2011
… accidents happen is critical in order to ensure road safety and to plan for adequate road infrastructure. There is a rich body of literature pertaining to time-related fatal crashes, most of which focuses on non-spatial factors such as a driver’s visibility at night, drinking and drug use, and …
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Modeling, analysis, and measurement of passenger vehicle stability
… of rollovers occur when a vehicle departs the roadway and encounters sloped and rough terrain at high speed. This thesis investigates the stability limits imposed by off-road terrain conditions and techniques for measuring vehicle stability in the presence of off-road terrain factors. An …
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Axiomatic design of customizable automotive suspension systems
… depending on user preference, vehicle speed, road conditions and maneuvering inputs. The design, fabrication and control of the customizable suspension prototype are discussed. The application of variable stiffness and variable ride-height suspension system to achieve improved vehicle dynamics …
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Improving pavement networks through performance-based planning with optimal treatment strategies and management policies
… fuel expenditures from 2017 to 2050 due to poor road conditions by 28% or about 62 billion dollars. All states can benefit from the proposed management policies. These research findings can help transportation agencies improve their performance-based planning for pavement networks within a …
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Design and Evaluation of an Active Yaw and Turbulence Generation System to Produce Unsteady Flow in Automotive Wind Tunnels
… for automotive wind tunnels that replicates on-road conditions using three combined subsystems. The focus of this thesis is primarily on one of the TGS subsystems, the unsteady yaw generation subsystem, which was made up of an airfoil-flap cascade. Tests were conducted in a 1/10th scale, 3/4 …
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The evaluation and modification of a prediction model for road surface temperatures
… been evaluated and modified to precisely predict road temperatures and road conditions during winter nights under all weather conditions at rural, suburban, and urban sites. The Partial Differential Equation approach gives encouraging results with average errors being close to -0.5°C and worse …
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Optimally controlling hybrid electric vehicles using path forecasting
… is made in part by using a prediction of future road conditions. The increasing presence of GPS navigational systems in the standard feature sets of the modern vehicles suggests that path predictive methods applied to HEVs constitute one of the most promising directions towards the solution of …
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Beta-prototype of a rickshaw suspension system
… most often operate, based on their speed and the road conditions the rickshaw regularly encounters. Ultimately, it was demonstrated that the placement of the spring within the suspension system had the greatest effect on the system's response. The configuration that applied the greatest moment to …
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