Development Of A Three Dimensional Lane Change Model
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Development Of A Three Dimensional Lane Change Model
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Author :
language : en
Publisher:
Release Date : 2008
Development Of A Three Dimensional Lane Change Model written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Modelling Heavy Vehicle Lane Changing
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Author : Sara Moridpour
language : en
Publisher:
Release Date : 2010
Modelling Heavy Vehicle Lane Changing written by Sara Moridpour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Lane changing manoeuvres have a substantial impact on microscopic and macroscopic traffic flow characteristics due to the interference effect they have on surrounding vehicles. The interference effects of heavy vehicles' lane changing manoeuvres on surrounding traffic are likely to be greater than when passenger cars execute lane changing manoeuvre. While heavy vehicles account for a minority of traffic stream, heavy vehicles have a pronounced effect on traffic flow and produce a disproportionate effect particularly during heavy traffic conditions. Heavy vehicles impose physical and psychological effects on surrounding traffic which are the results of physical and operational characteristics of heavy vehicles. The number of heavy vehicles on urban freeways has increased over the past three decades and this trend is likely to continue over the next decade. Despite the increasing number of heavy vehicles on freeways, previous studies have predominantly focused on the behaviour of passenger car drivers. In the previous lane changing models, heavy vehicles are accommodated in current lane changing models by calibrating the parameters of a general lane changing model for heavy vehicles rather than by incorporating a lane changing model developed specifically for the heavy vehicle drivers. However, heavy vehicle and passenger car drivers may have fundamentally different lane changing behaviour.In this study, the trajectory dataset is based on the video images of two freeway sections. In general, extracting the trajectory dataset from video images makes it impossible to capture some physical (e.g. weight) and operational (e.g. power) characteristics of vehicles. The length of vehicles is one of their physical characteristics that can be extracted from video images. Therefore, vehicle length is used to identify heavy vehicles in this research. The vehicles with the length of equal to or greater than 6 meters are classified as heavy vehicles. This classification is consistent with the definition of the heavy vehicles in the trajectory dataset used for this study.In this research, the lane changing behaviour of a driver has been characterized as a sequence of three stages including motivation to change lanes, selection of the target lane and the execution of the lane change. This research has provided new insight into the role that traffic parameters associated with the surrounding vehicles plays in the lane changing behaviour of heavy vehicle and passenger car drivers. From detailed examination of vehicle trajectory data, differences were identified in the lane changing of heavy vehicle and passenger car drivers in terms of the three stages of lane changing behaviour.To understand the influencing factors on heavy vehicle drivers' lane changing, it is required to analyse the surrounding traffic characteristics at the time that the heavy vehicle drives change lanes as well as when they do not wish to execute lane changing manoeuvre. From detailed examination of the surrounding traffic characteristics, the explanatory variables in heavy vehicle drivers' lane changing decision were identified.A reliable model has been developed in this thesis to estimate the lane changing behaviour of heavy vehicle drivers. Drivers' lane changing behaviour has been characterised as a sequence of two stages: the decision to change lanes and the execution of the lane change. Hence, separate models were considered for those two stages of the heavy vehicle drivers' lane changing behaviour. Fuzzy logic was used to develop a model of the lane changing decision of heavy vehicle drivers. The lane changing decision has been defined as the motivation for selecting either the right adjacent lane (slower lane) or the left adjacent lane (faster lane). Therefore, two separate models were developed for the lane changing decision of heavy vehicle drivers: Lane Changing to Slower Lane (LCSL) and Lane Changing to Faster Lane (LCFL). The explanatory variables in motivating heavy vehicle drivers to move into the slower lane include: the front space gap, the rear space gap, the lag space gap in the right lane and the average speed of the surrounding vehicles in the current lane. The explanatory variables in motivating heavy vehicle drivers to move into the faster lane include: the front relative speed, the lag relative speed in the left lane and the average speeds of the surrounding vehicles in the current lane and the left lane. A triangular membership function was used for all fuzzy sets in the lane changing decision model. The leave-one-out cross-validation method was used to examine the accuracy of the models in estimating the lane changing manoeuvres of heavy vehicle drivers. The obtained results showed that the LCFL model has higher percentage of accurately estimating the heavy vehicle drivers' lane changing decision. This may be due to the fact that heavy vehicle drivers mainly move into the faster lane to gain speed advantages which could be modelled by the microscopic traffic characteristics of surrounding vehicles in the current and the left lanes. However, the heavy vehicle drivers may have other motivations for moving into the slower lane than only the differences in microscopic traffic characteristics in the current and the right lanes.The speed and acceleration/deceleration profiles of heavy vehicles were analysed in detail from the start to the end of lane changing manoeuvres. The results showed that heavy vehicle drivers maintain an almost constant speed during lane changing execution. They do not accelerate or decelerate to adjust their speed according to the speeds of the surrounding vehicles in the target lane. Subsequently, a simple constant speed model could be assumed for the heavy vehicles during the lane changing execution.Finally, the performance of the heavy vehicle drivers' lane changing model was examined macroscopically and microscopically using VISSIM (German abbreviation for 'traffic simulation in cities') microscopic traffic simulation model. The heavy vehicle lane changing model in VISSIM was substituted with a combination of the fuzzy logic heavy vehicle lane changing decision model and a constant speed lane changing execution model. The traffic measurements obtained from the fuzzy logic model were compared to those obtained from a calibrated VISSIM lane changing model and the actual field observations. The results show that using the fuzzy logic heavy vehicle lane changing model provided more accurate estimates of the macroscopic traffic measurements. The number of heavy vehicle lane changing manoeuvres estimated by the fuzzy logic model was found to be more accurate than the estimates from default lane changing model in VISSIM. The microscopic analysis of the lane changing manoeuvres shows that using the fuzzy logic model more accurately replicated the microscopic lane changing behaviour of the heavy vehicle drivers. In particular, the fuzzy logic model accurately replicates the observed speed profile of heavy vehicles and the observed space gap and speed profiles of the surrounding vehicles during lane changing manoeuvres. The superior performance of the fuzzy logic heavy vehicle drivers' lane changing model highlights the importance of developing an exclusive lane changing model for heavy vehicle drivers. Employing a purpose built heavy vehicle lane changing model has been shown to increase the accuracy of the microscopic traffic simulation model.
Development Of A Geodatabase And Conceptual Model Of The Hydrogeologic Units Beneath Air Force Plant 4 And Naval Air Station Joint Reserve Base Carswell Field Fort Worth Texas
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Author :
language : en
Publisher: DIANE Publishing
Release Date :
Development Of A Geodatabase And Conceptual Model Of The Hydrogeologic Units Beneath Air Force Plant 4 And Naval Air Station Joint Reserve Base Carswell Field Fort Worth Texas written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Modeling Of Lane Change Policy For Lateral Idm Focusing On Microscopic Traffic Simulators
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Author : Sai Krishna Ramavajula
language : en
Publisher:
Release Date : 2020
Modeling Of Lane Change Policy For Lateral Idm Focusing On Microscopic Traffic Simulators written by Sai Krishna Ramavajula and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Automobile driving categories.
The purpose of this thesis is to aid in the development of a comprehensive lateral model for microscopic traffic simulators called the Lateral Intelligent Driver Model (Lateral IDM), to implement realistic lateral maneuvers, and define the lateral behavior for the vehicles. The majority of the microscopic traffic simulators have reached a sophisticated level in the modeling of the longitudinal dynamics. However, a similar model for the lateral dynamics does not exist. The proposed model works in conjunction with the Intelligent Driver Model, an existing car-following model. The lateral IDM has essentially three parts: the Road-following vehicle model, target lane function, and lane change policy. The main contributions of this work are based on the development of the lane change policy. The existing lane change models are studied to understand their limitations and incorporate some of the learnings from these models. The basic lane change maneuver is developed using a PD controller. Since the lateral IDM aims to be as general as possible the target lane and its curvature are also considered. The lane change maneuver is implemented in a Frenet Frame coordinate system. This work constitutes the free road behavior of the vehicle, i.e the lane change behavior when no other traffic participant is present. The control barrier function theory is used to develop safety barriers for the ego vehicle given a traffic configuration. This approach is used to derive the admissible control space for the vehicle. The model specifications such as integrating with existing IDM, extending the safety definition and choice of extended class k function, and their influence on the admissible control space are shown. This thesis is concluded by discussing the next steps involved in extending the safety barriers approach. Also, how the work that was done as a part of this research could be put together in the completion and deployment of a lateral IDM is discussed.
The Theory Methods And Application Of Managing Digital Supply Chains
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Author : Muhammad Shujaat Mubarik
language : en
Publisher: Emerald Group Publishing
Release Date : 2024-05-21
The Theory Methods And Application Of Managing Digital Supply Chains written by Muhammad Shujaat Mubarik and has been published by Emerald Group Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-05-21 with Business & Economics categories.
Detailing the diverse aspects of digitalization in supply chain management, Digital Supply Chain Management helps business managers harness the cutting edge, guiding those early in their careers who seek a challenging new path whilst informing top-level managers who have their eye on the future.
Recent Trends In Applied Nonlinear Mechanics And Physics
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Author : Mohamed Belhaq
language : en
Publisher: Springer
Release Date : 2017-11-13
Recent Trends In Applied Nonlinear Mechanics And Physics written by Mohamed Belhaq and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-13 with Science categories.
This book presents contributions on the most active lines of recent advanced research in the field of nonlinear mechanics and physics selected from the 4th International Conference on Structural Nonlinear Dynamics and Diagnosis. It includes fifteen chapters by outstanding scientists, covering various aspects of applications, including road tanker dynamics and stability, simulation of abrasive wear, energy harvesting, modeling and analysis of flexoelectric nanoactuator, periodic Fermi–Pasta–Ulam problems, nonlinear stability in Hamiltonian systems, nonlinear dynamics of rotating composites, nonlinear vibrations of a shallow arch, extreme pulse dynamics in mode-locked lasers, localized structures in a photonic crystal fiber resonator, nonlinear stochastic dynamics, linearization of nonlinear resonances, treatment of a linear delay differential equation, and fractional nonlinear damping. It appeals to a wide range of experts in the field of structural nonlinear dynamics and offers researchers and engineers an introduction to the challenges posed by nonlinearities in the development of these topics
Underground Space The 4th Dimension Of Metropolises Three Volume Set Cd Rom
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Author : Jiri Bartak
language : en
Publisher: CRC Press
Release Date : 2007-05-11
Underground Space The 4th Dimension Of Metropolises Three Volume Set Cd Rom written by Jiri Bartak and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-11 with Technology & Engineering categories.
The so-called fourth dimension of a metropolis is the underground space beneath a city which typically includes structures such as tunnels, which facilitate transport and provide gas, water and other supplies. Underground space may also be utilised for living, working and recreational facilities and industrial storage. These volumes focus on underg
Treatise On Geomorphology
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Author :
language : en
Publisher: Academic Press
Release Date : 2013-02-27
Treatise On Geomorphology written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-02-27 with Science categories.
The changing focus and approach of geomorphic research suggests that the time is opportune for a summary of the state of discipline. The number of peer-reviewed papers published in geomorphic journals has grown steadily for more than two decades and, more importantly, the diversity of authors with respect to geographic location and disciplinary background (geography, geology, ecology, civil engineering, computer science, geographic information science, and others) has expanded dramatically. As more good minds are drawn to geomorphology, and the breadth of the peer-reviewed literature grows, an effective summary of contemporary geomorphic knowledge becomes increasingly difficult. The fourteen volumes of this Treatise on Geomorphology will provide an important reference for users from undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic. Information on the historical development of diverse topics within geomorphology provides context for ongoing research; discussion of research strategies, equipment, and field methods, laboratory experiments, and numerical simulations reflect the multiple approaches to understanding Earth’s surfaces; and summaries of outstanding research questions highlight future challenges and suggest productive new avenues for research. Our future ability to adapt to geomorphic changes in the critical zone very much hinges upon how well landform scientists comprehend the dynamics of Earth’s diverse surfaces. This Treatise on Geomorphology provides a useful synthesis of the state of the discipline, as well as highlighting productive research directions, that Educators and students/researchers will find useful. Geomorphology has advanced greatly in the last 10 years to become a very interdisciplinary field. Undergraduate students looking for term paper topics, to graduate students starting a literature review for their thesis work, and professionals seeking a concise summary of a particular topic will find the answers they need in this broad reference work which has been designed and written to accommodate their diverse backgrounds and levels of understanding Editor-in-Chief, Prof. J. F. Shroder of the University of Nebraska at Omaha, is past president of the QG&G section of the Geological Society of America and present Trustee of the GSA Foundation, while being well respected in the geomorphology research community and having won numerous awards in the field. A host of noted international geomorphologists have contributed state-of-the-art chapters to the work. Readers can be guaranteed that every chapter in this extensive work has been critically reviewed for consistency and accuracy by the World expert Volume Editors and by the Editor-in-Chief himself No other reference work exists in the area of Geomorphology that offers the breadth and depth of information contained in this 14-volume masterpiece. From the foundations and history of geomorphology through to geomorphological innovations and computer modelling, and the past and future states of landform science, no "stone" has been left unturned!
Development Of A Geodatabase And Conceptual Model
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Author :
language : en
Publisher: DIANE Publishing
Release Date :
Development Of A Geodatabase And Conceptual Model written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
The Sage Handbook Of Geomorphology
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Author : Kenneth J Gregory
language : en
Publisher: SAGE
Release Date : 2011-06-13
The Sage Handbook Of Geomorphology written by Kenneth J Gregory and has been published by SAGE this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-13 with Science categories.
Geomorphology is the study of the Earth′s diverse physical land-surface features and the dynamic processes that shape these features. Examining natural and anthropogenic processes, The SAGE Handbook of Geomorphology is a comprehensive exposition of the fundamentals of geomorphology that examines form, process, and applications of the discipline. Organized into five substantive sections, the Handbook is an overview of: • Foundations and Relevance: including the nature and scope of geomorphology; the origins and development of geomorphology; the role and character of theory in geomorphology; geomorphology and environmental management; and geomorphology and society • Techniques and Approaches: including observations and experiments; geomorphological mapping; the significance of models; process and form; dating surfaces and sediment; remote sensing in geomorphology; GIS in geomorphology; biogeomorphology; human activity • Process and Environment: including the evolution of regolith; weathering; fluids, flows and fluxes; sediment transport and deposition; hill slopes; riverine environments; glacial geomorphology; periglacial environments; coastal environments; aeolian environments; tropical environments; karst and karst processes • Environmental Change: including landscape evolution and tectonics; interpreting quaternary environments; environmental change; disturbance and responses to geomorphic systems • Conclusion: including challenges and perspectives; and a concluding review The Handbook has contributions from 48 international authors and was initially organized by the International Association of Geomorphologists. This will be a much-used and much-cited reference for researchers in Geomorphology, Physical Geography and the Environmental Sciences.