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.
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Showing 1 to 19 of 19 for “"Vehicle Acceleration"”.
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A Study of the Capacity Drop Phenomenon at Time-Dependent and Time-Independent Bottlenecks
… reductions are not impacted by the level of vehicle acceleration. Alternatively, the drop in the discharge flow rate caused by time-dependent bottleneck is recoverable and is dependent on the level of acceleration. The difference in behavior is attributed to the fact that in the case of a …
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Truck Modeling Along Grade Sections
… important for the development of an exhaustive vehicle performance procedure. Analysis was done based on data collected at the Troutville weigh station. The characterization involves an analysis of vehicle class distribution, GVW (Gross Vehicle Weight) distribution, vehicle volume distribution, …
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Analysis of the Use of Probe Vehicles for Road Infrastructure Data Analysis
… the concept of using sensors found in normal vehicles, also known as probe vehicles, to collect road infrastructure data. This concept was demonstrated by measuring vertical acceleration using in-vehicle sensors in order to describe road ride quality. Data collection was performed at the …
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Calibration and Comparison of the VISSIM and INTEGRATION Microscopic Traffic Simulation Models
… car-following model which accounts for vehicle acceleration constraints. The INTEGRATION software, however uses a physical vehicle dynamics model while the VISSIM software requires the user to input a vehicle-specific speed-acceleration kinematics model. The use of a vehicle dynamics …
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Platoon modal operations under vehicle autonomous adaptive cruise control model
… for Automated Highway Systems in the Advanced Vehicle Control Systems (AVeS). Three control modes, constant speed, emergency and vehicle-following, are defined based on the minimum safe stopping distance, and applied to the platoon operations. Desired acceleration model is built for the …
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Supercapacitor electrode materials based on nanostructured conducting polymers and metal oxides
… such as electric and hybrid electric vehicles. The higher power density of supercapacitors offers improved vehicle acceleration and the ability to recover more energy from regenerative breaking, since they can be charged and discharged at high current. Generally, the key for …
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Human Perception of Transient Longitudinal Vehicle Motion
… during transient longitudinal motion of a vehicle is little understood. Optimizing vehicle motion to maximize occupant comfort is of great interest to vehicle manufacturers. The imminent wide-scale deployment of autonomous control has further increased the attention on the ride comfort …
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Microscopic Fuel Consumption and Emission Modeling
Mathematical models to predict vehicle fuel consumption and emission metrics are presented in this thesis. Vehicle fuel consumption and emissions are complex functions to be approximated in practice due to numerous variables affecting their outcome. Vehicle energy and emissions are particularly …
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The Effect of Novel External Communication Display on Pedestrian Judgements of Acceleration
… in accurately assessing traffic conditions and vehicle actions, leading to potentially fatal collisions. One promising solution could be the use of additional visual cues through external vehicle lighting on the front of vehicles to aid pedestrians in making safer decisions. This research …
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Development of an Intelligent Tire Based Tire - Vehicle State Estimator for Application to Global Chassis Control
… the tire and the road is the key enabler of vehicle acceleration, deceleration and steering. However, under the circumstances of sudden changes to the road conditions, the driver`s ability to maintain control of the vehicle maybe at risk. In many cases, this requires intervention from the …
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Field Evaluation Methodology for Quantifying Network-wide Efficiency, Energy, Emission, and Safety Impacts of Operational-level Transportation Projects
… without significantly altering the underlying vehicle speed profile. Several smoothing techniques are then applied to the acceleration profile, including data trimming, Simple Exponential smoothing, Double Exponential smoothing, Epanechnikov Kernel smoothing, Robust Kernel smoothing, and Robust …
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Study of a Pneumatic Hybrid aided by a FPGA Controlled Free Valve Technology System
Urban traffic involves frequent acceleration and deceleration. During deceleration, the energy previously used to accelerate the vehicle is mainly wasted on heat generated by the friction brakes. If this energy that is wasted in traditional IC engines could be saved, the fuel economy would improve. …
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Vehicle Dynamics Model for Predicting Maximum and Typical Acceleration Rates for Passenger Vehicles
Effectively modeling the acceleration behavior of vehicles is an important consideration in a variety of transportation engineering applications. The acceleration profiles of vehicles are important in the geometric design of roadways and are used to model vehicle behavior in simulation software …
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Characterizing Human Driving Behavior Through an Analysis of Naturalistic Driving Data
Reducing the number of motor vehicle crashes is one of the major challenges of our times. Current strategies to reduce crash rates can be divided into two groups: identifying risky driving behavior prior to crashes to proactively reduce risk and automating some or all human driving tasks using …
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Real-Time Anticipatory Suspension Control for Single Event Disturbances
Most commercial vehicles currently on the market are still equipped with a passive suspension system, while some luxury brands may already use an adaptive suspension. Active suspension systems on the other hand are rarely found, however, they offer great opportunities to close the gap of the …
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Development of a smartphone application to measure pavement roughness and to identify surface irregularities
… that adversely affects the ride quality of a vehicle. Roughness also affects user delay costs, fuel consumption, tire, and maintenance costs. Roughness is predominantly characterized in terms of International Roughness Index (IRI), which is often measured using inertial profilers. Inertial …
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Eco-Driving in the Vicinity of Roadway Intersections - Algorithmic Development, Modeling and Testing
Vehicle stops and speed variations account for a large percentage of vehicle fuel losses especially at signalized intersections. Recently, researchers have attempted to develop tools that reduce these losses by capitalizing on traffic signal information received via vehicle connectivity with …
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Path Selection to Minimize Energy Consumption of an Electric Vehicle using Synthetic Speed Profiles and Predictive Terminal Energy
Manufacturers of passenger vehicles are experiencing increased pressure from consumers and legislators due to the impact of transportation on the environment. Automotive manufacturers are responding by designing more sustainable forms of transportation through a variety of efforts, including …
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An Analysis of EcoRouting Using a Variable Acceleration Rate Synthesis Model
… fuel consumption and greenhouse gas emissions of vehicles. This has led to many automotive manufacturers starting production of Plug-in Hybrid Electric Vehicles (PHEV's) and Battery Electric Vehicles (BEV's). Another method that helps to reduce the environmental effect of transportation is …