Relevant bibliographies by topics / The operating performance of vehicles

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'The operating performance of vehicles'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "The operating performance of vehicles"

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MERKISZ, Jerzy, Ireneusz PIELECHA, and Jarosław MARKOWSKI. "Operating parameters of high performance vehicle engines." Combustion Engines 131, no. 4 (November 1, 2007): 3–18. http://dx.doi.org/10.19206/ce-117313.

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The paper presents the assessment of operating parameters for piston combustion engines used in sports vehicles. The assessment was made for parameters of selected performance vehicles: Formula 1, Le Mans and WRC in relation to conventional vehicles. The conventional vehicles were classified within two categories: sports vehicles and general use road vehicles. Basic engine characteristics were analyzed and the parameter values obtained allowed a comparison of the engines.
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Zhao, Ming Yu, Ying Hui Wang, Zhi Yuan Lu, and Wei Guo Zhang. "Electric Vehicle Operating Characteristics Analysis Based on Structural Equation Model." Applied Mechanics and Materials 278-280 (January 2013): 202–6. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.202.

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Through research of user activity characteristics of the user's social attributes of electric vehicles, electric vehicles, electric vehicles performance and electric vehicles running environment, this paper puts forward electric vehicle running characteristics model, specificly select factors affecting variables, uses structural equation modeling on operating characteristics of the electric vehicle, uses AMOS6.0 software for solve and data fitting adoping least square method, finally gives credible analysis results.
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KOSSOV, E. E., V. V. ASABIN, A. G. SILYUTA, and L. E. L. E. KOSSOVA. "Criterion for evaluating vehicle performance." Vestnik of the Railway Research Institute 78, no. 2 (June 5, 2019): 96–99. http://dx.doi.org/10.21780/2223-9731-2019-78-2-96-99.

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The article proposes to evaluate the efficiency of an autonomous vehicle, taking into account not only the energy consumption for motion, but also the time of motion, i. e. both factors — efficiency and performance — should be taken into account. As a criterion for evaluating the efficiency of vehicles, authors propose the multiplication of efficiency on performance — the energy efficiency indicator (EEI). The best will be the vehicle with the highest EEI. The indicator should be calculated according to the specified technical characteristics of the vehicle laid down in the technical specifications. This criterion is suitable both for the evaluation of the vehicle during the design and during operation. At the same time, it is possible to evaluate and compare the EEI of technical vehicles not only of railway transport. The article presents the criterion values for water, rail and air transport. Proposed criterion makes it possible to evaluate the change in vehicle efficiency over time due to technical progress. Since 1953, the energy efficiency of a diesel locomotive has increased almost 3 times. To calculate the operational energy efficiency, it is necessary to obtain data on the actual performance of the vehicle. On railway transport, this is data on train work in t·km, speed and fuel consumption. The EEI assessment based on operating data will show how correctly the organization of vehicle operation is built, how non-stationary modes of the power plant and specific modes of traction influence the overall performance of the vehicle, how well the vehicle is selected for these operating conditions.
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Guarda, Gregory, Apostolos Pesyridis, and Ashish Alex Sam. "Preliminary Investigation of the Performance of an Engine Equipped with an Advanced Axial Turbocharger Turbine." Applied Sciences 10, no. 21 (October 23, 2020): 7452. http://dx.doi.org/10.3390/app10217452.

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Stringent emission regulations and increased demand for improved fuel economy have called for advanced turbo technologies in automotive engines. The use of turbochargers on smaller engines is one such concept, but they are limited by a time delay in reaching the required boost during transient operation. The amount of turbocharger lag plays a key role in the driver’s perceived quality of a passenger vehicle’s engine response. This paper investigates an alternative method to the conventional design of a turbocharger turbine to improve the transient response of a passenger vehicle. The investigation utilises the Ford Eco-Boost 1.6 L petrol engine, an established production engine, equipped with a turbocharger of similar performance to the GT1548 produced by Honeywell. The commercially available Ricardo WAVE was used to model the engine. Comparing the steady-state performance showed that the axial turbine provides higher efficiencies at all operating conditions of an engine. The transient case demonstrated an improved transient response at all operating conditions of the engine. The study concluded that, by designing a similar sized axial turbine, the mass moment of inertia can be reduced by 12.64% and transient response can be improved on average by 11.76%, with a maximum of 21.05% improvement. This study provides encouragement for the wider application of this turbine type to vehicles operating on dynamic driving cycles such as passenger vehicles, light commercial vehicles, and certain off-road applications.
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Mukhitdinov, Akmal, Kamoliddin Ziyaev, Janserik Omarov, and Shokhsanam Ismoilova. "Methodology of constructing driving cycles by the synthesis." E3S Web of Conferences 264 (2021): 01033. http://dx.doi.org/10.1051/e3sconf/202126401033.

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The difference in the dynamics of the development of motorization in the regions of the world, the levels of traffic organization, determines the need to develop a methodology for specific operating conditions. Improvement of the existing driving cycles and methods of their development, which characterize the real operating conditions, is of great importance. An important task is considered the implementation of targeted research to improve automobile operation efficiency of vehicles by introducing modern information technologies into the process of determining the driving cycles, modernizing the design parameters of vehicles by assessing the influence of driving conditions when rationing fuel consumption, developing methods for choosing the design parameters of vehicles and the most adapted vehicle for specific operating conditions. The article provides a systematic analysis of scientific research of methodology for constructing driving cycles, factors influencing the performance and driving modes, as well as the fuel consumption of the car. The methodology for constructing a standard driving cycle for specific urban operating conditions is given based by synthesizing on passenger car driving modes in the city.
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Spielberg, Nathan A., Matthew Brown, Nitin R. Kapania, John C. Kegelman, and J. Christian Gerdes. "Neural network vehicle models for high-performance automated driving." Science Robotics 4, no. 28 (March 27, 2019): eaaw1975. http://dx.doi.org/10.1126/scirobotics.aaw1975.

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Automated vehicles navigate through their environment by first planning and subsequently following a safe trajectory. To prove safer than human beings, they must ultimately perform these tasks as well or better than human drivers across a broad range of conditions and in critical situations. We show that a feedforward-feedback control structure incorporating a simple physics-based model can be used to track a path up to the friction limits of the vehicle with performance comparable with a champion amateur race car driver. The key is having the appropriate model. Although physics-based models are useful in their transparency and intuition, they require explicit characterization around a single operating point and fail to make use of the wealth of vehicle data generated by autonomous vehicles. To circumvent these limitations, we propose a neural network structure using a sequence of past states and inputs motivated by the physical model. The neural network achieved better performance than the physical model when implemented in the same feedforward-feedback control architecture on an experimental vehicle. More notably, when trained on a combination of data from dry roads and snow, the model was able to make appropriate predictions for the road surface on which the vehicle was traveling without the need for explicit road friction estimation. These findings suggest that the network structure merits further investigation as the basis for model-based control of automated vehicles over their full operating range.
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Gan, Jing, Xiaobin Fan, Zeng Song, Mingyue Zhang, and Bin Zhao. "Power Test System Development and Dynamic Performance State Estimation Based on Hub Motor Vehicle." Recent Patents on Mechanical Engineering 13, no. 2 (May 31, 2020): 126–40. http://dx.doi.org/10.2174/2212797613666200131143626.

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Background: The power performance of an electric vehicle is the basic parameter. Traditional test equipment, such as the expensive chassis dynamometer, not only increases the cost of testing but also makes it impossible to measure all the performance parameters of an electric vehicle. Objective: A set of convenient, efficient and sensitive power measurement system for electric vehicles is developed to obtain the real-time power changes of hub-motor vehicles under various operating conditions, and the dynamic performance parameters of hub-motor vehicles are obtained through the system. Methods: Firstly, a set of on-board power test system is developed by using virtual instrument (Lab- VIEW). This test system can obtain the power changes of hub-motor vehicles under various operating conditions in real-time and save data in real-time. Then, the driving resistance of hub-motor vehicles is analyzed, and the power performance of hub-motor vehicles is studied in depth. The power testing system is proposed to test the input power of both ends of the driving motor, and the chassis dynamometer is combined to test so that the output efficiency of the driving motor can be easily obtained without disassembly. Finally, this method is used to carry out the road test and obtain the vehicle dynamic performance parameters. Results: The real-time current, voltage and power, maximum power, acceleration time and maximum speed of the vehicle can be obtained accurately by using the power test system in the real road experiment. Conclusion: The maximum power required by the two motors reaches about 9KW, and it takes about 20 seconds to reach the maximum speed. The total power required to maintain the maximum speed is about 7.8kw, and the maximum speed is 62km/h. In this article, various patents have been discussed.
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Wu, Xiao Hua, and Wei Li. "Overview Study of Multi-Dynamic Coupling Drive System on EV." Applied Mechanics and Materials 288 (February 2013): 125–29. http://dx.doi.org/10.4028/www.scientific.net/amm.288.125.

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The multi-dynamic coupling drive system can coordinate the operating characteristics of all power sources, optimize the total efficiency and driving characteristic of the drive system, and hence improve the performance of electric vehicles. Therefore, it has greater energy saving potential and better prospects. Under the premise of meeting the needs of electric vehicle performance, how to synthesis and decompose the output power of the different power sources reasonablely and efficiently is the core problem. There are a number of driving modes existing in the the multi-dynamic coupling drive electric vehicles. The coordination control of the torque of related power sources during the transition among different modes is essential to vehicle’s power and ride comfort performance. It is meaningful to improve the system efficiency and drivability performance by control strategy, while ensuring the capability of energy saving and emission reduction.
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Schlenther, Tilmann, Kai Martins-Turner, Joschka Felix Bischoff, and Kai Nagel. "Potential of Private Autonomous Vehicles for Parcel Delivery." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 11 (September 10, 2020): 520–31. http://dx.doi.org/10.1177/0361198120949878.

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Using the same vehicles for both passenger and freight transport, to increase vehicle occupancy and decrease their number, is an idea that drives transport planners and is also being addressed by manufacturers. This paper proposes a methodology to simulate the behavior of such vehicles within an urban traffic system and evaluate their performance. The aim is to investigate the impacts of resignation from fleet ownership by a transport service company (TSC) operating on a city-wide scale. In the simulation, the service provider hires private autonomous cars for tour performance. Based on assumptions concerning the operation of such vehicles and TSCs, the software Multi-Agent Transport Simulation (MATSim) is extended to model vehicle and operator behavior. The proposed framework is applied to a case study of a parcel delivery service in Berlin serving a synthetic parcel demand. Results suggest that the vehicle miles traveled for freight purposes increase because of additional access and egress trips. Moreover, the number of vehicles en route is higher throughout the day. The lowering of driver costs can reduce the costs of the operator by approximately 74.5%. If the service provider additionally considers the resignation from fleet ownership, it might lower the operation cost by another 10%, not taking into account the costs of system transfer or risks like vehicle non-availability. From an economic perspective, the reduction of the overall number of vehicles in the system seems to be beneficial.
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Regehr, Jonathan D., Jeannette Montufar, and Garreth Rempel. "Safety performance of longer combination vehicles relative to other articulated trucks." Canadian Journal of Civil Engineering 36, no. 1 (January 2009): 40–49. http://dx.doi.org/10.1139/l08-109.

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This article helps improve the understanding about the safety performance of longer combination vehicles (LCVs) relative to other articulated trucks operating on rural highways, using evidence from the Canadian portion of the CANAMEX trade corridor. The analysis reveals that from a collision rate perspective, LCVs as a group have better safety performance than other articulated trucks. Turnpike doubles have the lowest collision rate of all articulated truck types (16 collisions per 100 million vehicle-kilometres of travel or VKT), followed by Rocky Mountain doubles (32 collisions per 100 million VKT). The collision rate for triple trailer combinations (62 collisions per 100 million VKT) is higher than the collision rates for tractor semitrailers (42 collisions per 100 million VKT) and legal-length tractor double trailers (44 collisions per 100 million VKT). These results are an important input for civil engineering and transport policy decisions concerning longer combination vehicle operations.
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Dissertations / Theses on the topic "The operating performance of vehicles"

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Tesfa, Belachew Chekene. "Investigations into the performance and emission characteristics of a biodiesel fuelled CI engine under steady and transient operating conditions." Thesis, University of Huddersfield, 2011. http://eprints.hud.ac.uk/id/eprint/11072/.

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The stringent emission laws, the depletion of petroleum reserves and the relation of fuels with politics have forced the world to find alternatives to fossil fuels. Biodiesel is one of the biofuels which is renewable and environmentally friendly and can be used in diesel engines with little or no modifications. For the last two decades, many researchers have reported extensive work on the performance and emission characteristics of engines running with biodiesel during steady state operation. However, there are numbers of knowledge gaps that have been identified which include limited information on biodiesel physio-chemical properties and their effects on combustion behaviour and performance and emission characteristics of the engine. In this study after an exhaustive literature review, the following four research areas have been identified and investigated extensively using available numerical and experimental means. The initial focus was to investigate the most important properties of biodiesel such as density, viscosity and lower heating value using experimental and numerical techniques. The effects of biodiesel blend content on the physical properties were analysed. For each property, prediction models were developed and compared with current models available in literature. New density and viscosity prediction models were developed by considering the combined effect of biodiesel content and temperature. All the empirical models have showed a fair degree of accuracy in estimating the physical properties of biodiesel in comparison to the experimental results. Finally, the effects of density and viscosity on the fuel supply system were investigated. This system includes the fuel filter, fuel pump and the engine combustion chamber in which air-fuel mixing behaviour was studied numerically. These models can be used to understand the effects of changes in the physical properties of the fuel on the fuel supply system. In addition, the fuel supply system analysis can be carried out during the design stage of fuel pump, fuel filter and injection system. The second research objective was the investigation into a CI engine’s combustion characteristics as well as performance and emissions characteristics under both the steady and transient conditions when fuelled with biodiesel blends. The effects of biodiesel content on the CI engine’s in-cylinder pressure, brake specific fuel consumption, thermal efficiency and emissions (CO2, NOx, CO, THC) were evaluated based on experimental results. It has been seen that the CI engine running with the biodiesel resulted in acceptable engine performance as well as reduction in main emissions (except NOx). Following this study, a detailed analysis on the transient performance and emission output of the CI engine has been carried out. During this analysis, the emission changing rate is investigated during speed transient and torque transition stages. Further to this, a transient emission prediction model has been developed using associated steady and transient emission data. The model has been shown to predict the transient emission reasonably accurately. The third research objective was to develop a method for on-line measurement of NOx emission. For this purpose the in-cylinder pressure generated within a CI engine has been measured experimentally along with mass air flow and these parameters have been used in the development of a NOx prediction model. This model has been validated using experimental data obtained from a NOx emission analyzer. The predicted data obtained from NOx prediction model has been compared with measured data and has shown that the deviation is within acceptable range. The final research objective was to develop a simple, reliable and low-cost novel method to reduce the NOx emission of the CI engine when using biodiesel blends. A potential solution to this problem has been found to be in the form of direct water injection which has shown to be capable to reduce NOx emission. Using a water injection technique, the performance and emission(NOx and CO) characteristics of a CI engine fuelled with biodiesel has been investigated at varying water injection flow rates. Intake manifold water injection reduces NOx emission by up to 40% over the entire operating range without compromising the performance characteristics of the CI engine
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Zuñiga, Alcaraz Catya Atziry. "Causal models for performance evaluation of added-value operations." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/96320.

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La presente tesis doctoral se presenta en forma de compendio de publicaciones, en la cual se han desarrollado diversos Modelos Causales para ayudar en la toma de decisiones usando como herramienta principal las relaciones causa-efecto inherente del sistema. A continuación se describen brevemente los artículos incluidos en la tesis doctoral El artículo titulado “A CD&CR causal model based on path shortening/path stretching techniques” publicado por la revista Transportation Research Part C: Emerging Technologies esta enfocado hacia la investigación académica de alto nivel que aborda el desarrollo, las aplicaciones y consecuencias, de las nuevas tecnologías en el campo del transporte. El enfoque del modelo causal desarrollado en Redes de Petri Coloreadas aportan no solo una metodología innovativa per se, sino que su aplicación e implicaciones en la etapa de planificación, diseño, y gestión, es de particular interés en el rendimiento general del sistema de transporte aéreo. En artículo titulado "Revisiting the pallet loading problem using a discrete event system approach to minimise logistic costs” publicado en la revista International Journal of Production Research (IJPR) se presenta un modelo orientado a eventos discretos para abordar el Problema del Palletizado (PLP) usando como formalismo de especificación las Redes de Petri Coloreadas. El problema de Paletizado conforma una parte fundamental en el flujo logístico de diversos sistemas de transporte (terrestre o aéreo), siendo un factor clave en etapas aguas arriba (e.g. producción) y abajo del sistema (e.g. distribución). El trabajo presenta una novedosa forma de modelado con una importante mejora de los kPI’s respecto a los actuales entornos comerciales, soportando tanto diferentes heurísticas así como su integración con el sistema para encontrar configuraciones óptimas para el acomodo de cajas con una tipología diversa. El artículo denominado "Integrating and sequencing flows in terminal maneuvering area by evolutionary algorithms," publicado por la IEEE/AIAA en el Digital Avionics Systems Conference (DASC), 2011 presenta una aproximación innovadora para aliviar el problema de congestión en el espacio aéreo terminal (terminal maneouvering área). En este artículo se analiza un procedimiento alternativo para la integración y secuenciación de las aeronaves en la fase de aterrizaje. El artículo ha recibido diversas menciones tal como el mejor artículo de la sesión, mejor artículo en la sección de mejoras a la capacidad del sector aéreo y mejor artículo de estudiante. Estas menciones indican la importancia y trascendencia de dicho trabajo donde se utilizan algoritmos desarrollados para la optimización de sistemas altamente complejos como es el espacio aéreo terminal. El artículo que lleva por nombre “A TMA 4DT CD/CR causal model based in path shortening/path stretching techniques”, publicado en el International Conference on Research in Air Transportation — ICRAT 2010, ha recibido la mención Best paper award reconociendo las aportaciones del trabajo presentado. El modelo desarrollado en Redes de Petri Coloreadas para la solución de conflictos entre aeronaves presenta resultados experimentales validados mediante simuladores de vuelo de la compañía Aireuropa que permiten validar las trayectorias obtenidas mediante el modelo desarrollado. Finalmente, el articulo Causal model to sequence and merge 4DT flows in TMA, se encuentran publicados en las memorias del International Conference on Application and Theory of Automation in Command and Control Systems ATTACS2011 donde se presenta un algoritmo de solución para la secuencializacion y fusión de flujos de aterrizaje de aeronaves donde se muestra el gran potencial para mejorar de la toma de decisiones usando el espacio de estados de los modelos de RdPC.
The present PhD thesis report has been elaborated as a compendium of publications, in which diverse Causal Models have been developed to assist in the decision making process using a cause-effect relationship approach inherent in the system. A brief description of the items included in the doctoral thesis. The document is organized in four different parts. First, the Chapter called “Basic Notions” introduces the basic notions and a general perspective on the systems approach. Particular interest has been placed in the Discrete-Event Systems approach, presenting the main features of this formalism. The main theory behind the Coloured Petri Nets approach is presented in Section 2.1.1 Different case studies are provided from Chapters 3 to 5. Chapter 3 presents the work named “A CD&CR causal model based on path shortening/path stretching techniques”, which has been accepted for publication in the Journal Transportation Research Part C: Emerging Technologies. This work depicts a groundbreaking approach to alleviate the airspace congestion and to deal with the implications for the planning, design, and management of Air Traffic Control operations. Particular interest has been placed Terminal Manoeuvring Area (TMA) where the traffic conditions impose to take time-critical decisions. Therefore, an appropriate management of arrival operations could alleviate congestion which impacts directly in capacity and efficiency of the overall Air Traffic Management operations. To evaluate the performance of the the resolution strategy to avoid non-efficient procedures, diverse scenarios have been tasted in a busy traffic period at Gran Canaria’s airport. The result obtain contribute with the planning and management of Air Traffic Control operations to increase the overall predictability of the Air traffic, with benefit to airlines and airports, among others. Chapter 4 corresponds to the article "Revisiting the pallet loading problem using a discrete event system approach to minimise logistic costs” published in the International Journal of Production Research (IJPR). This work presents an innovative and challenging modelling approach to optimize the space and distribution of boxes into a pallet, supporting the inherent box diversity (heterogeneous palletizing problems) of present production and distribution logistic systems. The space utilization is modelled as squares that can be fragmentise and de-fragmentise. In a first approach, the state space analysis is performed to evaluate different optimal configurations to load the maximum number of boxes on a rectangular pallet. The second approach implements heuristics to show that acceptable occupancy results can be obtained without requiring the exhaustive evaluation of the different feasible combination. Chapter 5 introduces the work "Integrating and sequencing flows in terminal maneuvering area by evolutionary algorithms" in proceeding of the IEEE/AIAA en el Digital Avionics Systems Conference (DASC), 2011. This work has received three mentions: Best student paper award; Best paper in the ATM Capacity Improvements track award; y Best paper of session award which confirm the transcendence and implications of such approach. This chapter presents a new approach to optimize a set of aircraft planned to land at a given airport. It is proposed to merge the incoming flows from different routes by mean of speed and path changes. Those changes aim to remove conflicts at merging points and to maintain separation of aircraft following the same route link according to their wake turbulence constraint. The optimization criteria are based on the minimum deviation from the initial path planning. This algorithm has been successfully applied to Gran Canaria airport in Spain with real traffic demand samples for which conflict free flow merging is produced smoothly with optimal runway feeding. Finally, Chapter 5 contains the overall conclusions, future work, summary of contributions and complementary publications on the author. The work presented in annex called “Causal model to sequence and merge 4DT flows in TMA” summarizes the development of a decision support algorithm to tackle the merging and sequencing problem within the Terminal Manoeuvring Area (TMA) sector. The algorithm works with multiple landing traffic flows that share the airspace in the same time window. A flexible terminal area route structure is proposed; it eliminates conflicts within the Standard Terminal Arrival (STAR) while traffic is merged prior converging on to the final approach. As a first instance the first come first serve (FCFS) sequence policy will be tasted and later on the sequence will be altered by means of the Constrained Position Shifting (CPS) algorithm. Gran Canaria STAR is used to evaluate the benefits of the proposed model under synthetic traffic; and to determine the spacing buffers the ICAO Separation minima (ICAO DOC-4444) criteria is used as on current methodology. Finally, in Annex, the paper “A TMA 4DT CD/CR causal model based in path shortening/path stretching techniques” introduces the basic ideas behind a discrete event model for Conflict Detection and Conflict Resolution algorithm in a TMA 4D trajectory scenario in presented which focuses mainly on the arrival phase. This model brings a very interesting knowledge about the events that take place in the management of 4DT and their interactions in Gran Canaria TMA to remove non-effective operations, avoid delay propagation between arrivals and optimize the occupancy of the runway. The causal model developed considers different alternative predefined turning points for each flight evaluating path shortening/path stretching of all trajectories upwards the merging point in a TMA.
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Paternostro, Simone. "Integration of ARAIM technique for integrity performance prediction, procedures development and pre-flight operations." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52097/.

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Advanced Receiver Autonomous Integrity Monitoring (ARAIM) is a new Aircraft Based Augmentation System (ABAS) technique, firstly presented in the two reports of the GNSS Evolutionary Architecture Study (GEAS). The ARAIM technique offers the opportunity to enable GNSS receivers to serve as a primary means of navigation, worldwide, for precision approach down to LPV-200 operation, while at the same time potentially reducing the support which has to be provided by Ground and Satellite Based Augmented Systems (GBAS and SBAS). Previous work analysed ARAIM performance, clearly showing the potential of this new architectures to provide the Required Navigation Performance down to LPV 200 approach procedures. However, almost all of the studies have been performed with respect to fixed points on a grid on the Earth’s surface, with full view of the sky, evaluating ARAIM performance from a geometrical point of view and using nominal performance in simulated scenarios which last several days. Though, the operational configuration was not examined; attitude changes from manoeuvres, obscuration by the aircraft body and shadowing from the surrounding environment could all affect the incoming signal from the GNSS constellations, leading to configurations that could adversely affect the real performance. In this research, ARAIM performances in simulated operational configurations are presented. Four different algorithms were developed that integrate the ARAIM technique for performance prediction analysis. These algorithms could usefully be implemented: • In the design of instrument approach procedures. The algorithms could be used to improve the procedure of the development of new instrument approaches, reducing time, effort and costs. • In the aircraft Flight Management Systems. The algorithms could support the pilots in the pre-flight briefing, highlighting possible integrity outage in advance and allowing them to select a different approach or making them aware of the need to utilise additional positioning systems. Increased awareness and better pre-flight planning could ultimately improve the safety of flights and contribute to the safe introduction of GNSS as a viable positioning method for instrument approach. The results showed that the aircraft attitude and the surrounding environment affect the performance of the ARAIM algorithm; each satellite lost generates a peak in the performance parameters that depends on the total number of satellites in view, their relative geometry and on the number of satellites lost at the same time. The main outcome of this research is the identification that the ideal scenario would be to have a tri-constellation system that provides at the same time high redundancy, reliability and increased safety margin.
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Moreno, C. "Identification, test and performance prediction of a novel energy absorbing mechanism for railway vehicles." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/81458/.

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Regulation requires railway energy absorbers to dissipate the collision energy and to prevent overriding. There is no industrial consensus about which energy absorbing mechanism is the most suitable for the crash conditions present in a collision between railway vehicles. There is scope for improving the existing designs or creating new concepts. The combination of two energy absorption mechanisms, expansion and splitting of cylindrical tubes, was identified as an improved energy absorption mechanism. Quasi-static and dynamic testing of scaled splitting, expansion and expansion splitting (hybrid) tubes was carried out to assess their force, stroke, energy absorption and oblique loading efficiency. In addition, the standard requires a calibrated numerical model of the energy absorber to predict its behaviour. The fracture strain of the tube and the coefficient of friction between the tube and the die are needed to build accurate numerical models. The fracture strain was measured using a Digital Image Correlation technique and a new methodology was developed to overcome its limitations. The inclusion of the fracture strain correctly predicted the deformation of the splitting specimens. The friction coefficient was adjusted until the energy absorption matched that observed during testing. Quasi-static testing showed that the force efficiency was 80%, 100% and 90%, for the splitting, expansion and hybrid tubes respectively. The stroke efficiency was measured as 77%, 44% and 70%, respectively. The energy absorption efficiency of the hybrid tubes was assessed as 11% and 40% higher than that of the splitting and expansion tubes respectively. The testing also showed that the hybrid tubes were more insensitive than the expansion and splitting tubes to the application of oblique loading. More testing may be necessary to confirm this assertion. The results suggest that the hybrid energy absorbing mechanism could become a commercial energy absorber with improved performance over the existing solutions. The validation of the hybrid numerical models showed an accurate prediction of the test results. A full-scale hybrid demonstrator has been tested and a patent of the hybrid concept applied for.
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Gibbs, John H. "Actuated Continuously Variable Transmission for Small Vehicles." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1238819759.

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Hickey, April M. "Utilizing ATCS Data to Inform a Dynamic Reassignment System for Muni Metro Light Rail Vehicles Departing Embarcadero Station." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1081.

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This is a report of a professional project intended to act as an informational tool for the evaluation of a dynamic dispatch system at Embarcadero Station for the San Francisco Municipal Transportation Agency (SFMTA). Systems that operate dispatch algorithms do so in response to on-time performance and reliability. The optimization problem is documented in many transportation contexts including airline networks, bus dispatch, and freight routing. According to the research, optimizing available options and re-routing based on available options can create a more efficient system that would minimize operating costs and improving service reliability for customers. The methodology presented here uses current headway information to dynamically change dispatch assignment between J, L, and M lines. The reassignment program was applied to randomly selected weekdays in March of 2012. After analysis it was determined that the application has the potential to decrease mean operating headways by up to 3% (or approximately 15 seconds).
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Svozil, Milan. "Analýza ztráty zisku dopravní organizace v důsledku opravy po nehodě u vozidel nad 12 t celkové hmotnosti." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-232680.

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This thesis, as a part of the overall project to determine general methodology for calculating lost profits, deals with technical and economic data of trucks, cost analysis and quantification of lost profits after an accident and subsequent mending. It focuses on vehicles with a total weight of over 12 tons. The thesis and its results are beneficial for the experts and forensic engineering experts who, based on documents can more easily determine a methodology for calculating lost profits. It simplifies and accelerates the settlement of claims for loss of profits and payments.
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Harris, William Ray. "Anomaly detection methods for unmanned underwater vehicle performance data." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98718.

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Thesis: S.M., Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 101-102).
This thesis considers the problem of detecting anomalies in performance data for unmanned underwater vehicles(UUVs). UUVs collect a tremendous amount of data, which operators are required to analyze between missions to determine if vehicle systems are functioning properly. Operators are typically under heavy time constraints when performing this data analysis. The goal of this research is to provide operators with a post-mission data analysis tool that automatically identifies anomalous features of performance data. Such anomalies are of interest because they are often the result of an abnormal condition that may prevent the vehicle from performing its programmed mission. In this thesis, we consider existing one-class classification anomaly detection techniques since labeled training data from the anomalous class is not readily available. Specifically, we focus on two anomaly detection techniques: (1) Kernel Density Estimation (KDE) Anomaly Detection and (2) Local Outlier Factor. Results are presented for selected UUV systems and data features, and initial findings provide insight into the effectiveness of these algorithms. Lastly, we explore ways to extend our KDE anomaly detection algorithm for various tasks, such as finding anomalies in discrete data and identifying anomalous trends in time-series data.
by William Ray Harris.
S.M.
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Fraser, Michael B. (Michael Brent). "Analyzing the operating efficiency of autonomous water vehicles." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68838.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 29).
Power consumption is a huge limitation in the application of autonomous vehicles, making the need for efficient processes more important. A greater operating efficiency could extend the capabilities of missions by consuming less power and energy. This thesis analyzed the operating efficiency of a small, autonomous water craft. The results of the study showed that the most efficient operating condition is to run the vehicle at the bare minimum to require movement. Less current is drawn from the battery to rotate the propellers and a greater proportional thrust return when compared to the work requirements. It was not possible to measure all of the operating conditions due to the limitations of the device themselves.
by Michael B. Fraser.
S.B.
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Moura, F. C. S. "Performance evaluation of operating systems." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374799.

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Books on the topic "The operating performance of vehicles"

1

Chatti, Karim. Estimating the effects of pavement condition on vehicle operating costs. Washington, D.C: Transportation Research Board, 2012.

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Accounts, Connecticut Auditors of Public. Performance audit report, Department of Administrative Services Fleet Operations. Hartford, Conn: Auditors of Public Accounts, 1996.

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Off-road high-performance handbook: How to build, modify and play with your offroad truck. Osceola, Wis., USA: Motorbooks International, 1988.

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Office, General Accounting. Unmanned aerial vehicles: Performance of short-range system still in question : report to the Chairman, Legislation and National Security Subcommittee, Committee on Government Operations, House of Representatives. Washington, D.C: The Office, 1993.

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Gilyard, Glenn B. In-flight transport performance optimization: An experimental flight research program and an operational scenario. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Center, 1997.

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Gilyard, Glenn B. In-flight transport performance optimization: An experimental flight research program and an operational scenario. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Center, 1997.

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Thatcher, Russell H. Vehicle Operator Recruitment, Retention, and Performance in ADA Complementary Paratransit Operations. Washington, D.C: TRANSPORTATION RESEARCH BOARD, 2010.

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Weiner, Richard, David Koffman, Russell H. Thatcher, Thomas Procopio, Caroline Ferris, Mary Davis, Clementine Morris, Will Rodman, Lisa Jacobson, and Marilyn Golden. Vehicle Operator Recruitment, Retention, and Performance in ADA Complementary Paratransit Operations. Washington, D.C.: National Academies Press, 2010. http://dx.doi.org/10.17226/14415.

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Archondo-Callao, Rodrigo. Estimating vehicle operating costs. Washington, D.C: World Bank, 1994.

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Sethi, Joginder. OpenVMS performance management. Boston: Digital Press, 1995.

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Book chapters on the topic "The operating performance of vehicles"

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Rojas, Raul Fernandez, Essam Debie, Justin Fidock, Michael Barlow, Kathryn Kasmarik, Sreenatha Anavatti, Matthew Garratt, and Hussein A. Abbass. "Human Performance Operating Picture for Shepherding a Swarm of Autonomous Vehicles." In Unmanned System Technologies, 293–323. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60898-9_13.

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Wei, Heng. "Synthetic Approach for Scenario-Based Performance Estimation of Connected Vehicles Operating at Highway Facilities." In Advances in Intelligent Systems and Computing, 9–10. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-38789-5_4.

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Schneider, Fabio, Joachim Linn, and Fredrik Andersson. "Digital validation of cable performance for vehicles in operation." In Proceedings, 405–16. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-29717-6_27.

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Bowden, Fred D. J., Andrew W. Coutts, Richard M. Dexter, Luke Finlay, Ben Pietsch, and Denis R. Shine. "Impacts of Unmanned Ground Vehicles on Combined Arms Team Performance." In Operations Research for Unmanned Systems, 119–38. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118918937.ch7.

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Nordengen, Paul, Hans Prem, and Luan Mai. "An initiative to introduce a performance-based standards (PBS) approach for heavy vehicle design and operations in South Africa." In International Conference on Heavy Vehicles HVParis 2008, 73–84. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2013. http://dx.doi.org/10.1002/9781118557464.ch5.

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Díaz-Samaniego, J. P., Jaime Guillén, Daniel Arroyo, and Michael Maks Davis. "Performance Evaluation of an Electric Vehicle in Real Operating Conditions of Quito, Ecuador." In Proceedings of the 4th International Congress of Automotive and Transport Engineering (AMMA 2018), 328–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94409-8_37.

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Muller, F. J., and P. L. Klevatt. "Thermal Performance Characteristics of a Combined External Insulation System under Simulated Space Vehicle Operating Conditions." In Advances in Cryogenic Engineering, 482–89. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4613-9847-9_57.

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Theaker, Colin J., and Graham R. Brookes. "Operating System Performance." In Concepts of Operating Systems, 196–202. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-11511-2_14.

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Whiting, Edwin. "Operating profit." In A Guide to Business Performance Measurements, 81–98. London: Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-07472-3_8.

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Alapati, Sam R., Darl Kuhn, and Bill Padfield. "Analyzing Operating System Performance." In Oracle Database 11g Performance Tuning Recipes, 185–208. Berkeley, CA: Apress, 2011. http://dx.doi.org/10.1007/978-1-4302-3663-4_6.

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Conference papers on the topic "The operating performance of vehicles"

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Ahn, Seong Sik, and Massimo Ruzzene. "Optimal Design of Supercavitating Vehicles Based on Trimmed Flight Performance." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95611.

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Supercavitating vehicles exploit supercavitation as a means to reduce drag and increase their underwater speed. The dynamic behavior of this class of vehicles is very complex as a result of the coupling between vehicle and cavity dynamics and of their strong interactions. In addition, the hydrodynamic stability of supercavitating vehicles needs to be carefully addressed as the loads are completely different from those on conventional submerged bodies. As a supercavity completely envelops the vehicle, most of its surface is acted upon by almost negligible water-vapor forces, and only a small percentage of it is wetted. As a result, the center of pressure is always ahead of the center of mass, thus violating a fundamental principle of hydrodynamic stability. To this date, a number of basic issues need to be addressed regarding configurational design and operating conditions of supercavitating vehicles. This paper presents a preliminary investigation, where the vehicle configuration is evaluated for optimal performance during trim, level flight. The dynamic behavior of the vehicle is investigated through a 6 degrees of freedom rigid body model. In the considered formulation, the vehicle is acted upon by gravity and propulsion and by loads generated by the control surfaces of the vehicle and by the interactions with the cavity. The control surfaces include 4 fins and the cavitator disk at the nose, which produces the cavity. Trimmed conditions for assigned velocity and vehicle configurations are evaluated by solving a nonlinear system of equations resulting from the vehicle’s equation of motion. The vehicle performance is defined in terms of achievable range of operation, which is used as an objective function in an optimization problem, where basic configurational and operational parameters are considered as design variables. The presented results show that proper selection of the vehicle configuration can significantly improve the selected performance index. The simulation of the vehicle dynamic behavior in trim conditions and its response to small perturbations with respect to the trim values show the challenges associated to the limited stability of the vehicle and provide indications for future investigations.
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Bozza, Fabio, Daniela Tufano, Enrica Malfi, Luigi Teodosio, Cédric LIBERT, and Vincenzo De Bellis. "Performance and Emissions of an Advanced Multi-Cylinder SI Engine Operating in Ultra-Lean Conditions." In 14th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-24-0075.

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Harrison, Harold D., Li R. Cheng, and William GeMeiner. "Tracking the Performance of Heavy Axle Load Vehicles in Revenue Service." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15730.

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As market forces drive up the gross weight on rail, railroads continue moving toward increased usage of heavy axle load (HAL) equipment, namely 286,000 lb and 315,000 lb GWR vehicles that provide more competitive and efficient transportation. According to the AAR's Universal Machine Language Equipment Register (UMLER) database, since 1995, at least 70% of vehicles built each year were HAL vehicles. 2005 had 49,923 more HAL vehicles running on the North America railroad system than the previous year. This practice can result in significant overall savings in operating costs. However, HAL equipment can also accelerate wear and damage to the railroad infrastructure and have a greater potential for truck warping and vehicle dynamics problems. Thus, keeping rolling stock and track safe while ramping up the usage of HAL equipment presents a significant challenge. Wheel Impact Load Detector (WILD) SuperSites, developed by Salient Systems Inc. (SSI), provide real time monitoring and alarming on excessive axle loads and vehicle dynamics. SuperSites are important tools in the scientific study of HAL vehicles and the monitoring of heavy haul operations. This paper provides a snapshot of results of studies conducted on Union Pacific (UP) HAL routes and demonstrates how HAL loads affect the rolling stock, the track, and the wheel/rail interaction. The heavier the load, the higher the impact of the defective wheels to the track; therefore, heavily loaded vehicle routes (such as the coal route from the Powder River Basin to Kansas City and the primary intermodal route from Los Angeles to El Paso) need to be monitored more proactively to avoid track structural damage.
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Marquis, Brian, and Robert Greif. "High Speed Curving Performance of Rail Vehicles." In 2015 Joint Rail Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/jrc2015-5620.

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On March 13, 2013, the Federal Railroad Administration (FRA) published a final rule titled “Vehicle/Track Interaction Safety Standards; High-Speed and High Cant Deficiency Operations” which amended the Track Safety Standards (49 CFR Part213) and the Passenger Equipment Safety Standards (49 CFR Part 238) in order to promote VTI safety under a variety of conditions at speeds up to 220 mph [1]. Among its main accomplishments, the final rule facilitates the expansion of higher speed passenger rail by revising the standards governing permissible operating speed in curves, allowing for higher cant deficiencies in all FRA Track Classes. To ensure safety is not diminished, the FRA Track Safety Standards require railroads to maintain their tracks to stricter track geometry standards whenever they operate at these higher curving speeds and cant deficiencies. These revisions were based on studies that examined the dynamic curving performance of various representative rail vehicles. This research investigates the steady-state curving performance of truck designs while traversing curves at various curving speeds and cant deficiencies. During steady-state curve negotiation, the axles of trucks generally offset laterally from the track centerline and develop angles of attack increasing the wheel-rail contact forces. Large lateral forces can develop, particularly in flange contact, resulting in increased wheel and rail wear, track panel shift, and the risk of derailment. Depending on the truck design, such forces become larger at higher cant deficiency. An understanding of the steady-state response of a rail vehicle in a curve is essential as it represents a significant part of the total dynamic response. The curving performance of an idealized rigid truck is analyzed using nonlinear analytical methods for a wide range of operating speeds and unbalance conditions. Emphasis is placed on higher speed curving and the results are used to interpret trends observed during recent field testing with Amtrak’s Acela High-Speed Trainset on the Northeast Corridor.
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Restrepo, J., J. Rosero, and S. Tellez. "Performance testing of electric vehicles on operating conditions in Bogotá DC, Colombia." In 2014 IEEE PES Transmission & Distribution Conference and Exposition - Latin America (PES T&D-LA). IEEE, 2014. http://dx.doi.org/10.1109/tdc-la.2014.6955276.

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Dong, Xuan, Wei Zhou, Wen-Liang Li, and Ying-Ji Liu. "Research on Improving TCP Performance over Wireless Network Communication in Long-Distance Operating Vehicles." In Tenth International Conference of Chinese Transportation Professionals (ICCTP). Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41127(382)245.

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Storms, Justin, Kevin Chen, and Dawn Tilbury. "A Semi-Autonomous Control Method to Improve Performance of Small Unmanned Ground Vehicles With Communication Latency." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60006.

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Teleoperated unmanned ground vehicles are very useful in environments that are hazardous for humans. When controlled manually, speed of operation can be very slow due to degraded and delayed feedback of information to/from the vehicle’s environment. Adding autonomy to the vehicle can make control for the human teleoperator easier and improve performance. This paper presents a semi-autonomous control method for avoiding collisions while driving a vehicle. The method is well suited for small unmanned ground vehicles in unstructured environments (i.e. environments without predefined roads/paths to follow). The semi-autonomous control method and the effect of communication latency are evaluated with a human subject study (N = 20) involving teleoperation of a simulated robot search task. Results show that while semi-autonomy does improve performance at low communication latency, the improvement is much larger at higher latencies.
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Montorsi, Luca, Massimo Martelli, Silvia Gessi, and Massimo Milani. "A Combined 0D-3D Numerical Approach for the Performance Prediction of Vehicles’ Heat Exchangers Under Actual Operating Conditions." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4271.

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The paper focuses on the development of a predictive numerical tool for the performance assessment of air-cooled cross-flow heat exchangers for vehicle application. First, a CFD approach for the simulation of vehicles’ radiators under actual operating conditions is proposed. The numerical analysis accounts both for the thermo-fluid dynamics behavior of each section of the heat exchanger and for the flow characteristics of the adopted fan. The full-scale geometry of the fan is included in the simulation as well as the casing and the real rotational speed. The CFD results are used to correlate the flow distribution across the different radiator’s sections and the actual working conditions of both the heat exchanger and the fan operation. Following this methodology, a generic radiator was divided in two different sub-domain types (internal/boundary), and for each one the Wall Heat Transfer Coefficient and the pressure drop 2D maps are determined on the basis of preliminary CFD simulations as functions of fluid velocity and temperature. These elements became the elementary blocks to be used by a custom-made algorithm to characterize exchangers of any size. The algorithm was extended to develop a fully featured PC software to calculate the performance of multiple sections exchangers.
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Javanbakht, Pirooz, Grace Liu, Mohamad Abdul-Hak, Judy Brunson, Oliver Cordes, and Salman Mohagheghi. "Performance analysis of an inductive wireless power transfer system applied for electric vehicles considering operating limits." In 2017 IEEE Transportation Electrification Conference and Expo (ITEC). IEEE, 2017. http://dx.doi.org/10.1109/itec.2017.7993343.

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De Paepe, Ward, Marina Montero Carrero, Alessio Pappa, Laurent Bricteux, and Francesco Contino. "Humidified Micro Gas Turbine for Range Extended Electric Vehicles: Thermodynamic Performance Assessment." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91389.

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Abstract To reduce the emission of greenhouse gases, there is nowadays a strong focus on the electrification of transportation, especially personal vehicles. One of the main limitations of this trend is the limited range of Electrical Vehicles (EVs) due to the rather low energy density of batteries compared to liquid fossil fuels. Adding a range extender allows for a significant increase of the vehicle driving range. Typical range extenders are Internal Combustion Engine (ICE) based. Although micro Gas Turbines (mGTs) are not adequate for continuous change of load, as would be the case when used as direct power source, operating them as range extender offers large potential, especially given their higher power-to-weight ratio than ICEs, but also due to their lower emissions, vibration levels and maintenance requirements. The main drawback of the mGT compared to the ICE is its lower electrical efficiency. Humidification of the mGT cycle allows boosting its performance and by doing so making it more compatible. In this paper, we investigate the feasibility of applying a (humidified) mGT as a range extender in EVs. In this investigation, we considered a small vehicle for use in urban area. The option of using an mGT as range extender (standard and humidified) is compared to the standard ICE based range extender. Aspen plus is used to assess the engines performance, showing that the humidified mGT has the highest potential in terms of fuel consumption reduction and range extension. Moreover, the humidified mGT presents similar performance compared to an ICE, leading to the same specific energy consumption. In addition, different pathways to compensate for the water consumption (exhaust gas condensation) are studied and discussed, revealing that the vehicle does not need external input of water.
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Reports on the topic "The operating performance of vehicles"

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Rolufs, Angela, Amelia Trout, Kevin Palmer, Clark Boriack, Bryan Brilhart, and Annette Stumpf. Integration of autonomous electric transport vehicles into a tactical microgrid : final report. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42007.

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The objective of the Autonomous Transport Innovation (ATI) technical research program is to investigate current gaps and challenges and develop solutions to integrate emerging electric transport vehicles, vehicle autonomy, vehicle-to-grid (V2G) charging and microgrid technologies with military legacy equipment. The ATI research area objectives are to: identify unique military requirements for autonomous transportation technologies; identify currently available technologies that can be adopted for military applications and validate the suitability of these technologies to close need gaps; identify research and operational tests for autonomous transport vehicles; investigate requirements for testing and demonstrating of bidirectional-vehicle charging within a tactical environment; develop requirements for a sensored, living laboratory that will be used to assess the performance of autonomous innovations; and integrate open standards to promote interoperability and broad-platform compatibility. This final report summarizes the team’s research, which resulted in an approach to develop a sensored, living laboratory with operational testing capability to assess the safety, utility, interoperability, and resiliency of autonomous electric transport and V2G technologies in a tactical microgrid. The living laboratory will support research and assessment of emerging technologies and determine the prospect for implementation in defense transport operations and contingency base energy resilience.
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Kodupuganti, Swapneel R., Sonu Mathew, and Srinivas S. Pulugurtha. Modeling Operational Performance of Urban Roads with Heterogeneous Traffic Conditions. Mineta Transportation Institute, January 2021. http://dx.doi.org/10.31979/mti.2021.1802.

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The rapid growth in population and related demand for travel during the past few decades has had a catalytic effect on traffic congestion, air quality, and safety in many urban areas. Transportation managers and planners have planned for new facilities to cater to the needs of users of alternative modes of transportation (e.g., public transportation, walking, and bicycling) over the next decade. However, there are no widely accepted methods, nor there is enough evidence to justify whether such plans are instrumental in improving mobility of the transportation system. Therefore, this project researches the operational performance of urban roads with heterogeneous traffic conditions to improve the mobility and reliability of people and goods. A 4-mile stretch of the Blue Line light rail transit (LRT) extension, which connects Old Concord Rd and the University of North Carolina at Charlotte’s main campus on N Tryon St in Charlotte, North Carolina, was considered for travel time reliability analysis. The influence of crosswalks, sidewalks, trails, greenways, on-street bicycle lanes, bus/LRT routes and stops/stations, and street network characteristics on travel time reliability were comprehensively considered from a multimodal perspective. Likewise, a 2.5-mile-long section of the Blue Line LRT extension, which connects University City Blvd and Mallard Creek Church Rd on N Tryon St in Charlotte, North Carolina, was considered for simulation-based operational analysis. Vissim traffic simulation software was used to compute and compare delay, queue length, and maximum queue length at nine intersections to evaluate the influence of vehicles, LRT, pedestrians, and bicyclists, individually and/or combined. The statistical significance of variations in travel time reliability were particularly less in the case of links on N Tryon St with the Blue Line LRT extension. However, a decrease in travel time reliability on some links was observed on the parallel route (I-85) and cross-streets. While a decrease in vehicle delay on northbound and southbound approaches of N Tryon St was observed in most cases after the LRT is in operation, the cross-streets of N Tryon St incurred a relatively higher increase in delay after the LRT is in operation. The current pedestrian and bicycling activity levels seemed insignificant to have an influence on vehicle delay at intersections. The methodological approaches from this research can be used to assess the performance of a transportation facility and identify remedial solutions from a multimodal perspective.
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Yoozbashizadeh, Mahdi, and Forouzan Golshani. Robotic Parking Technology for Congestion Mitigation and Air Quality Control Around Park & Rides. Mineta Transportation Institute, June 2021. http://dx.doi.org/10.31979/mti.2021.1936.

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A lack or limited availability for parking may have multiple consequences, not the least of which is driver frustration, congestion, and air pollution. However, there is a greater problem that is not widely recognized by the public, namely the negative effect on the use of transit systems due to insufficient parking spaces close to key transit stations. Automated parking management systems, which have been successfully deployed in several European and Japanese cities, can manage parking needs at transit stations more effectively than other alternatives. Numerous studies have confirmed that quick and convenient automobile access to park-and-ride lots can be essential to making public transit competitive with the automobile in suburban areas. Automated parking systems use a robotic platform that carries each vehicle to one of the locations in a custom designed structure. Each location is designed compactly so that considerably more vehicles can be parked in the automated garages than the traditional parking lots. Central to the design of these systems are three key technologies, namely: 1. Mechanical design and the operation of vehicle transfer, i.e., the robotic platform 2. Structural and architectural requirements to meet safety and earthquake standards, among other design imperatives, 3. Automation and intelligent control issues as related to the overall operation and system engineering. This article concerns the first technology, and more specifically the design of the robotic platform for vehicle transfers. We will outline the overall design of the robot and the shuttle, followed by a description of the prototype that was developed in our laboratories. Subsequently, performance related issues and scalability of the current design will be analyzed.
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Francfort, James Edward, N. Nguyen, J. Phung, J. Smith, and M. Wehrey. Field Operations Program, Toyota PRIUS Hybrid Electric Vehicle Performance Characterization Report. Office of Scientific and Technical Information (OSTI), December 2001. http://dx.doi.org/10.2172/910981.

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Hover, Franz S. Maneuvering Performance of Autonomous Underwater Vehicles. Fort Belvoir, VA: Defense Technical Information Center, April 2006. http://dx.doi.org/10.21236/ada446746.

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Chen, Won-Zon, Jan M. DeLuca, Jeffrey D. Koeller, William F. O'Neil, and Ivan H. Wong. Autonomous Unmanned Aerial Vehicle (UAV) Airspace Operations Sensing Requirements. Volume 1 - Performance. Fort Belvoir, VA: Defense Technical Information Center, July 2002. http://dx.doi.org/10.21236/ada410310.

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Bahlavouni, Armen, Douglas Andersen, and Peter Stein. Ice Penetrating Communication Buoy for Underwater Vehicles Operating in the Arctic. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada626117.

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Kommepalli, H., A. Hirsh, C. Rahn, and S. Tadigadapa. Performance Piezoelectric Airframes for Nano Air Vehicles. Fort Belvoir, VA: Defense Technical Information Center, June 2008. http://dx.doi.org/10.21236/ada483748.

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Miaou, S. P., P. S. Hu, and J. R. Young. Fleet vehicles in the Unites States: composition, operating characteristics, and fueling practices. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/7049380.

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Miaou, S. P., P. S. Hu, and J. R. Young. Fleet vehicles in the Unites States: composition, operating characteristics, and fueling practices. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/10167656.

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