Готові списки джерел за темами / Angle of sideslip

Добірка наукової літератури з теми "Angle of sideslip"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Angle of sideslip"

1

Ko, Arim, Kyoungsik Chang, Dong-Jin Sheen, Young-Hee Jo, and Ho Joon Shim. "CFD Analysis of the Sideslip Angle Effect around a BWB Type Configuration." International Journal of Aerospace Engineering 2019 (April 23, 2019): 1–14. http://dx.doi.org/10.1155/2019/4959265.

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Анотація:
In this study, we conducted numerical simulations for a nonslender BWB type planform with a rounded leading edge and span of 2.0 m to analyze the effect of the sideslip angle on the planform at a freestream velocity of 60 m/s. The Reynolds number based on the mean chord length was 2.9×106, and we considered the angle of attack ranging from -4° to 16° and sideslip angles up to 20°. We used an unstructured mesh with a prism layer for the boundary layer with 1.11×107 grid points, and the k−ω SST turbulence model. We analyzed force and moment coefficients with respect to variation of angle of attack and sideslip angles. Side force and rolling/yawing moment coefficients had highly nonlinear relationships with the sideslip angle while lift and drag coefficients were not significantly affected. We interpreted the mechanism of these aerodynamic characteristics based on pressure and skin friction contours. Suction pressure near the leading edge had a marked effect on the pitching and rolling moment. We identified five flow types on the blunt leading edge swept wing by skin friction lines and off-body streamlines at a high angle of attack and sideslip angles.
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2

Popowski, Stanisław, and Witold Dąbrowski. "MEASUREMENT AND ESTIMATION OF THE ANGLE OF ATTACK AND THE ANGLE OF SIDESLIP." Aviation 19, no. 1 (March 30, 2015): 19–24. http://dx.doi.org/10.3846/16487788.2015.1015293.

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Анотація:
The paper presents issues concerning the estimation of the angle of attack and the angle of sideslip on a flying object board. Angle of attack and sideslip estimation methods which are based on measurements of linear velocity components of an object with the Earth’s coordinates and on attitude angles of the object are presented. Both of these measurements originate from the inertial navigation system, and velocity measurement is obtained from the satellite navigation system. The idea of applying inertial and satellite navigation for the estimation of attack and sideslip angles is presented. Practical comparison of these estimation methods has been conducted based on logged parameters of a flight onboard a Mewa aircraft. Development proposals for these methods are presented as well.
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3

Fan, Xiao Bin, and Pan Deng. "Study of Vehicle Sideslip Angle Real-Time Estimation Method." Advanced Materials Research 846-847 (November 2013): 26–29. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.26.

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Анотація:
In the vehicle stability control and other active safety systems, vehicle sideslip angle real-time estimation is necessary. However, the direct measurement of sideslip angle is more difficult or too costly, so it is often used in estimating methods. The vehicle sideslip angle of closed-loop Luenberger observer and Kalman observer were constructed based on two degrees of freedom bicycle model, as well as the direct integration method for large sideslip angle conditions. The comparative study showed that Kalman filtering estimation method and Luenberger estimation methods have better estimation accuracy in small slip angle range.
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4

Wei, Wang, Bei Shaoyi, Zhang Lanchun, Zhu Kai, Wang Yongzhi, and Hang Weixing. "Vehicle Sideslip Angle Estimation Based on General Regression Neural Network." Mathematical Problems in Engineering 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3107910.

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Анотація:
Aiming at the accuracy of estimation of vehicle’s mass center sideslip angle, an estimation method of slip angle based on general regression neural network (GRNN) and driver-vehicle closed-loop system has been proposed: regarding vehicle’s sideslip angle as time series mapping of yaw speed and lateral acceleration; using homogeneous design project to optimize the training samples; building the mapping relationship among sideslip angle, yaw speed, and lateral acceleration; at the same time, using experimental method to measure vehicle’s sideslip angle to verify validity of this method. Estimation results of neural network and real vehicle experiment show the same changing tendency. The mean of error is within 10% of test result’s amplitude. Results show GRNN can estimate vehicle’s sideslip angle correctly. It can offer a reference to the application of vehicle’s stability control system on vehicle’s state estimation.
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5

FIGAT, Marcin, and Zdobysław GORAJ. "ANALYSIS OF STABILITY DERIVATIVES IMPORTANT TO RECOVERY FROM SPIN." Aviation 20, no. 2 (June 16, 2016): 48–52. http://dx.doi.org/10.3846/16487788.2016.1195060.

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Анотація:
This paper describes the numerical analysis of light aircraft stability derivatives in a wide range of angles of attack, important for recovery from spin. Stability derivatives versus angle of attack and sideslip were calculated using a CFD software, based on Euler equation combined with boundary layer equations. The analysis was performed up to the 40 deg of angle of attack and up to 25 deg of sideslip.
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6

Singh, Kanwar Bharat. "Virtual sensor for real-time estimation of the vehicle sideslip angle." Sensor Review 40, no. 2 (July 29, 2019): 255–72. http://dx.doi.org/10.1108/sr-11-2018-0300.

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Анотація:
Purpose The vehicle sideslip angle is an important state of vehicle lateral dynamics and its knowledge is crucial for the successful implementation of advanced driver-assistance systems. Measuring the vehicle sideslip angle on a production vehicle is challenging because of the exorbitant price of a physical sensor. This paper aims to present a novel framework for virtually sensing/estimating the vehicle sideslip angle. The desired level of accuracy for the estimator is to be within +/− 0.2 degree of the actual sideslip angle of the vehicle. This will make the precision of the proposed estimator at par with expensive commercially available sensors used for physically measuring the vehicle sideslip angle. Design/methodology/approach The proposed estimator uses an adaptive tire model in conjunction with a model-based observer. The performance of the estimator is evaluated through experimental tests on a rear-wheel drive vehicle. Findings Detailed experimental results show that the developed system can reliably estimate the vehicle sideslip angle during both steady state and transient maneuvers, within the desired accuracy levels. Originality/value This paper presents a novel framework for vehicle sideslip angle estimation. The presented framework combines an adaptive tire model, an unscented Kalman filter-based axle force observer and data from tire mounted sensors. Tire model adaptation is achieved by making extensions to the magic formula, by accounting for variations in the tire inflation pressure, load, tread-depth and temperature. Predictions with the adapted tire model were validated by running experiments on the Flat-Trac® machine. The benefits of using an adaptive tire model for sideslip angle estimation are demonstrated through experimental tests. The performance of the observer is satisfactory, in both transient and steady state maneuvers. Future work will focus on measuring tire slip angle and road friction information using tire mounted sensors and using that information to further enhance the robustness of the vehicle sideslip angle observer.
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7

Huang, Yanwei, Xiaocheng Shi, Wenchao Huang, and Shaobin Chen. "Internal Model Control-Based Observer for the Sideslip Angle of an Unmanned Surface Vehicle." Journal of Marine Science and Engineering 10, no. 4 (March 26, 2022): 470. http://dx.doi.org/10.3390/jmse10040470.

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Анотація:
Since the sideslip angle is often ignored or simplified in the process of path following of unmanned surface vehicle by using the line-of-sight (LOS) guidance law because of its fast change and the difficulty of measurement, an observer was proposed by internal model control (IMC) to quickly estimate the sideslip angle in the LOS guidance law. First, a prediction model was established for the tracking error, and a state space model for prediction errors was constructed as an internal model. With the introduction of the auxiliary variables, a new augmented system was set up for a state space model of the prediction errors. Then, the sideslip angle observer was designed by the theory of state feedback with the feature of the control law of a proportional-integral type. Theoretically, the stability of the system was proved based on the Lyapunov criteria. A simulation and experiment verified the effectiveness of the proposed sideslip angle observer in improving the path-following accuracy. The results show that the IMC-based observer introduces a proportional term of tracking error that is not considered by other observers, which is easier to implement and adjust, and has a faster response speed and a smaller steady-state error for the sideslip angle. In addition, the assumption of a small sideslip angle is not introduced in the design process, so the proposed observer provides an accurate estimation method for a large sideslip angle.
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8

Kryvokhatko, Illia. "Aerodynamic moment characteristics of tandem-scheme aircraft." MATEC Web of Conferences 304 (2019): 02015. http://dx.doi.org/10.1051/matecconf/201930402015.

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Анотація:
Aerodynamic interference between forward and back wings of tandem-scheme aircraft significantly affects its pitch and roll moments. The interference increases roll stability in a narrow range of sideslip angles; there is a kink on the dependence of roll moment coefficient versus sideslip angle (that is not observed for conventional-scheme aircraft). Directional stability is decreased by a dihedral angle of forward wings and winglets on them but is increased by the same factors for back wings. If back wings’ bending is significant, then aerodynamic interference may affect directional stability as well. The vortex system of tandem-wings at a sideslip angle was modeled incorrectly by the used CFD method (solving RANS), and further research is needed. The analytical and experimental methods show a good agreement concerning moment characteristics.
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9

Singh, Kanwar Bharat. "Vehicle Sideslip Angle Estimation Based on Tire Model Adaptation." Electronics 8, no. 2 (February 9, 2019): 199. http://dx.doi.org/10.3390/electronics8020199.

Повний текст джерела
Анотація:
Information about the vehicle sideslip angle is crucial for the successful implementation of advanced stability control systems. In production vehicles, sideslip angle is difficult to measure within the desired accuracy level because of high costs and other associated impracticalities. This paper presents a novel framework for estimation of the vehicle sideslip angle. The proposed algorithm utilizes an adaptive tire model in conjunction with a model-based observer. The proposed adaptive tire model is capable of coping with changes to the tire operating conditions. More specifically, extensions have been made to Pacejka's Magic Formula expressions for the tire cornering stiffness and peak grip level. These model extensions account for variations in the tire inflation pressure, load, tread depth and temperature. The vehicle sideslip estimation algorithm is evaluated through experimental tests done on a rear wheel drive (RWD) vehicle. Detailed experimental results show that the developed system can reliably estimate the vehicle sideslip angle during both steady state and transient maneuvers.
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10

Covaciu, Dinu, Ion Preda, Dragoş Sorin Dima, and Anghel Chiru. "Study on the Possibility to Estimate the Vehicle Side Slip Using Two Independent GPS Receivers." Applied Mechanics and Materials 822 (January 2016): 321–30. http://dx.doi.org/10.4028/www.scientific.net/amm.822.321.

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Анотація:
Slip angle is the difference between the direction a vehicle is travelling and the longitudinal plane of the vehicle body. Knowing vehicle sideslip angle accurately is critical for active safety systems such as Electronic Stability Program (ESP). Vehicle sideslip angle can be measured using optical speed sensors, inertial sensors and/or dual-antenna GPS receivers. These systems are expensive and their use is limited for many users. The goal of this paper is to analyze the possibility to estimate the vehicle sideslip angle, in real-time, by using two low-cost single-antenna GPS receivers.
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Більше джерел

Дисертації з теми "Angle of sideslip"

1

Bayar, Kerem. "Development of a Vehicle Stability Control Strategy for a Hybrid Electric Vehicle Equipped With Axle Motors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1305990434.

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2

Morrison, Thomas M. "THE USE OF TELEMETRY DATA IN AN AIR DATA SYSTEM." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604135.

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Анотація:
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California
Telemetry data are usually collected for analysis at some later time and can be monitored to follow the progress of a test. In the case of an Air Data System the signals from the sensors are sent to a computer that calculates the air data parameters for use on multiple LabView-generated displays, as well as to the Data Acquisition System. The readouts on the multiple displays need to be real-time so they are useful to the flight crew. Equations that control the different air data values are determined by what telemetry data are available and the preference of those doing the test planning. These systems need to display the information in a format useful to the flight crew and be reliable.
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3

BRANDL, ALBERTO. "Techniques for effective virtual sensor development and implementation with application to air data systems." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842493.

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4

Baffet, Guillaume. "Développement et validation expérimentale d’observateurs des forces du contact pneumatique/chaussée d’une automobile." Compiègne, 2007. http://www.theses.fr/2007COMP1695.

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Анотація:
La connaissance de la dynamique d'un véhicule et de son environnement est un enjeu majeur. L'objectif de cette thèse est de développer des observateurs d'état permettant d'estimer des variables liées à l'adhérence du contact pneumatique/chaussée. Différentes méthodes d'observation sont proposées afin de reconstruire les efforts des pneumatiques et l'angle de dérive d'une automobile. Ces algorithmes d'estimation sont conçus pour être fonctionnels en cas de situation de conduite critique, notamment lors de fortes accélérations latérales ou lorsque l'adhérence de la chaussée varie. Outre une description des techniques d'observation mises en oeuvre, cette étude présente d'importantes phases de validation par la simulation et l'expérimentation. Ce travail a abouti à la conception d'un module temps réel embarqué qui a pu être évalué relativement à des mesures des forces des roues
Estimation of vehicle-dynamic variables is essential for safety enhancement, in particular for braking and trajectory-control systems. The aim of this thesis is to develop state observers for the estimation of variables linked to tire-road friction. Different estimation methods are proposed in order to reconstruct tire-road forces and vehicle sideslip angle. The estimation algorithms are constructed so as to be functional in critical driving situations, notably for weak lateral accelerations and road friction changes. In addition to estimation methods, this thesis presents a substantial number of observer evaluations, performed in simulations and in experiments. The estimation process was integrated in an experimental vehicle, and was tested in real time, particularly in relation to wheel force measurements
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5

Tekin, Gokhan. "Design And Simulation Of An Integrated Active Yaw Control System For Road Vehicles." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609243/index.pdf.

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Анотація:
Active vehicle safety systems for road vehicles play an important role in accident prevention. In recent years, rapid developments have been observed in this area with advancing technology and electronic control systems. Active yaw control is one of these subjects, which aims to control the vehicle in case of any impending spinning or plowing during rapid and/or sharp maneuver. In addition to the development of these systems, integration and cooperation of these independent control mechanisms constitutes the current trend in active vehicle safety systems design. In this thesis, design methodology and simulation results of an active yaw control system for two axle road vehicles have been presented. Main objective of the yaw control system is to estimate the desired yaw behavior of the vehicle according to the demand of the driver and track this desired behavior accurately. The design procedure follows a progressive method, which first aims to design the yaw control scheme without regarding any other stability parameters, followed by the development of the designed control scheme via taking other stability parameters such vehicle sideslip angle into consideration. A two degree of freedom vehicle model (commonly known as &ldquo
Bicycle Model&rdquo
) is employed to model the desired vehicle behavior. The design of the controller is based on Fuzzy Logic Control, which has proved itself useful for complex nonlinear design problems. Afterwards, the proposed yaw controller has been modified in order to limit the vehicle sideslip angle as well. Integration of the designed active yaw control system with other safety systems such as Anti-Lock Braking System (ABS) and Traction Control System (TCS) is another subject of this study. A fuzzy logic based wheel slip controller has also been included in the study in order to integrate two different independent active systems to each other, which, in fact, is a general design approach for real life applications. This integration actually aims to initiate and develop the integration procedure of the active yaw control system with the (ABS). An eight degree of freedom detailed vehicle model with nonlinear tire model is utilized to represent the real vehicle in order to ensure the validity of the results. The simulation is held in MATLAB/Simulink environment, which has provided versatile design and simulation capabilities for this study. Wide-ranging simulations include various maneuvers with different road conditions have been performed in order to demonstrate the performance of the proposed controller.
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6

Chang, Wen-Huan. "Effect of juncture fillets on double-delta wings undergoing sideslip at high angles of attack." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA286165.

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Анотація:
Thesis (M.S. in Aeronautical Engieering) Naval Postgraduate School, September 1994.
Thesis advisor(s): S. K.Hebbar, Max F. Platzer. "September 1994." Includes bibliographical references. Also available online.
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7

Lojková, Lea. "Experimentální metodologie měřicího řetězce." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219052.

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Анотація:
This work is focused on the development of a thorough study about ISO standards focused on the vehicle dynamics, standardized tests of vehicle dynamics and measured variables that allow us to describe and model the behaviour of riding vehicles properly. In the Appendix A of the thesis, there is a list of all known ISO standards dealing with given topic. The standard ISO 15037-1 Road vehicles – Vehicle dynamics test methods, Part 1: General conditions for passenger cars is described in detail, including the forms for test reports and the Appendix C and D. In the thesis, there is also described a model of minimal needed measuring system that is still in good accordance with the standard ISO 15037-1 and fulfills all its requirements. Detailed description of all used sensors that are used to measure required variables is given, as well as a short description of all sensors that are used for measurement of other variables. After that, measurement abilities of the instrumentation of measuring system RIO used in ÚADI FSI Brno is compared and confronted with requirements given by the standard, to see, if all given criteria are properly fulfilled. Because of the fact that standard-given criteria are quite mild, while the equipment of the faculty is high-level technology, mostly made directly for measuring of dynamic parameters of the vehicles, including racing vehicles, the system is in full accordance with the standard ISO 15037-1.
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8

Alatorre, Vazquez Angel Gabriel. "Robust estimation of dynamics behavior and driving diagnosis applied to an intelligent MAGV." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2554.

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Анотація:
Cette thèse présente une série de stratégies pour estimer la dynamique des véhicules. Le but de ce travail est de développer une stratégie d'observation qui peut être appliquée aux véhicules de série. L'idée d'avoir un algorithme dans une voiture produite en série pose un grand nombre de défis,' ceux que nous considérons dans ce travail sont la robustesse et le coût. Nous avons proposé des modèles et des stratégies d'observateurs capables de faire face à des niveaux d'excitation élevés et faibles. Nous avons validé la robustesse de l'algorithme avec de nombreux tests, des petites pistes à faible vitesse aux manœuvres de changement de voie. Nos algorithmes ont été retravaillés plusieurs fois pour atteindre un degré de précision qui peut être utile pour l'intégration dans ADAS. Nous avons également proposé des stratégies d'observateurs qui permettent ce degré de robustesse tout en conservant une grille de capteurs à faible coût. Les principales contributions sont au nombre de trois : 1 - Estimation de la vitesse latérale et longitudinale,' ces variables sont essentielles pour une bonne rétroaction des régulateurs de stabilisation et de vitesse de croisière. Notre proposition utilise comme base un modèle cinématique pour éviter d'utiliser des paramètres liés à la masse dans notre modèle; cela est possible puisque notre grille de capteurs comprend des accéléromètres et des gyroscopes. L'une des principales contributions de cette section est la compensation de la gravité,' une équation différentielle de quaternions définit l'attitude de notre système. Plus de 100 tests valident la robustesse de l'algorithme, et nous obtenons des résultats cohérents dans chacun d'eux. 2- Estimation de l'estimation de la force pneu-sol normale. Cette variable est, à notre avis, la plus difficile à estimer car la grille de capteurs des véhicules de série ne contient pas beaucoup de capteurs mesurant la dynamique verticale. Cette section doit étendre notre solution aux véhicules de série avec des systèmes de suspension améliorés, y compris des capteurs de déflexion. Nous pouvons estimer la masse, la distribution de masse et le centre de gravité avec ces capteurs en place et transmettre l'estimation normale de la force pneu-sol en utilisant la fusion de modèles et le filtre de Kalman. 3 - Stratégies d'estimation des forces longitudinales et latérales pneu-sol. La première méthode utilise les modèles bicycle et hoverboard connus et les filtres de Kalman pour estimer les TGFs, et d'autres modèles sont introduits pour répartir ces forces sur le pneu adéquat. Cette méthode doit gérer la saturation des pneus, pour séparer correctement les TGF virtuels. La deuxième méthode utilise les lois de Newton du mouvement; ici, nous calculons les accélérations locales en utilisant l'accélération et les rotations d'un corps rigide. Étant donné que nous connaissons déjà les TGF normaux à chaque pneu, nous pouvons calculer les TGFs latéraux et longitudinaux avec précision. Cette dernière méthode est plus précise et robuste que la première méthode. Enfin, au final, nous proposons une série de systèmes qui bénéficieront des estimations antérieures
The context of this thesis is the improvement of road safety through the development of active safety systems. One challenge in the development of active safety systems is obtaining accurate information about unmeasurable vehicle dynamic states. Specifically, the necessity to estimate the vertical load, frictional forces at each wheel (longitudinal and lateral), and also the sideslip angle at the center of gravity. These states are the critical parameters for optimizing the control of a vehicle’s stability. If the vertical load on each tire can be estimated, then the risk of rollover can be evaluated. Estimating tire lateral forces can help to reduce lateral slip and prevent dangerous situations like spinning and drifting out the road. Tire longitudinal forces influence the performance of a vehicle. Sideslip angle is one of the essential parameters for controlling the lateral dynamics of a vehicle. However, the different technologies that the market offers, are not based on tire-ground forces due to the lack of cost-effective methods for obtaining the required information. For the above mentioned reasons, we want to develop a system that monitors these dynamic vehicle states using only low-cost sensors. To accomplish our endeavor, we propose developing novel observers to estimate unmeasured states. Constructing an observer that met the reliability, robustness and accuracy requirements is not an easy task. It requires one the one hand, accurate and efficient models, and on the other hand, robust estimation algorithms that take into account variations in parameters and measurement errors. The present thesis has consequently been structured around the following two aspects: modeling of vehicle dynamics, and design of observers. Under the heading of modeling, we propose new models to describe vehicle dynamics. Current models simplify the vehicle motion as a planar motion. In our proposal, our models describe vehicle motion as a 3D motion, including the effects of road inclination. Regarding vertical dynamics, we propose incorporating the suspension deflection to calculate the transfer of vertical load. Regarding lateral dynamics, we propose a model for the lateral forces transfer to describe the interaction between the left wheel and the right wheel. With this relationship, the lateral force on each tire is computed without using the sideslip angle. Similarly, for longitudinal dynamics, we also propose a model for the transfer of longitudinal forces to calculate the longitudinal force at each tire. Under the heading of observer design, we propose a novel observation system consisting of four individual observers connected in cascade. The four observers are developed for estimating vertical tire force, lateral tire force, longitudinal tire force, and sideslip angle, respectively. For the linear system, the Kalman filter is employed, while for the nonlinear system, the EKF applied to reduce estimation errors. Finally, we implement our algorithm in an experimental vehicle to perform estimation in real-time, and we validate our proposed algorithm using experimental data
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9

Golinucci, Luca. "Lateral tires characterization: testing, analytical models and applications for aeronautic purpose." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6097/.

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Анотація:
The lateral characteristics of tires in terms of lateral forces as a function of sideslip angle is a focal point in the prediction of ground loads and ground handling aircraft behavior. However, tests to validate such coefficients are not mandatory to obtain Aircraft Type Certification and so they are not available for ATR tires. Anyway, some analytical values are implemented in ATR calculation codes (Flight Qualities in-house numerical code and Loads in-house numerical code). Hence, the goal of my work is to further investigate and validate lateral tires characteristics by means of: exploitation and re-parameterization of existing test on NLG tires, implementation of easy-handle model based on DFDR parameters to compute sideslip angles, application of this model to compute lateral loads on existing flight tests and incident cases, analysis of results. The last part of this work is dedicated to the preliminary study of a methodology to perform a test to retrieve lateral tire loads during ground turning with minimum requirements in terms of aircraft test instrumentation. This represents the basis for future works.
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10

Nawathe, Piyush. "Neural Network Trees and Simulation Databases: New Approaches for Signalized Intersection Crash Classification and Prediction." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4067.

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Анотація:
Intersection related crashes form a significant proportion of the crashes occurring on roadways. Many organizations such as the Federal Highway Administration (FHWA) and American Association of State Highway and Transportation Officials (AASHTO) are considering intersection safety improvement as one of their top priority areas. This study contributes to the area of safety of signalized intersections by identifying the traffic and geometric characteristics that affect the different types of crashes. The first phase of this thesis was to classify the crashes occurring at signalized intersections into rear-end, angle, turn and sideswipe crash types based on the traffic and geometric properties of the intersections and the conditions at the time of the crashes. This was achieved by using an innovative approach developed in this thesis "Neural Network Trees". The first neural network model built in the Neural Network tree classified the crashes either into rear end and sideswipe or into angle and turn crashes. The next models further classified the crashes into their individual types. Two different neural network methods (MLP and PNN) were used in classification, and the neural network with a better performance was selected for each model. For these models, the significant variables were identified using the forward sequential selection method. Then a large simulation database was built that contained all possible combinations of intersections subjected to various crash conditions. The collision type of crashes was predicted for this simulation database and the output obtained was plotted along with the input variables to obtain a relationship between the input and output variables. For example, the analysis showed that the number of rear end and sideswipe crashes increase relative to the angle and turn crashes when there is an increase in the major and minor roadways' AADT and speed limits, surface conditions, total left turning lanes, channelized right turning lanes for the major roadway and the protected left turning lanes for the minor roadway, but decrease when the light conditions are dark. The next phase in this study was to predict the frequency of different types of crashes at signalized intersections by using the geometric and traffic characteristics of the intersections. A high accuracy in predicting the crash frequencies was obtained by using another innovative method where the intersections were first classified into two different types named the "safe" and "unsafe" intersections based on the total number of lanes at the intersections and then the frequency of crashes was predicted for each type of intersections separately. This method consisted of identifying the best neural network for each step of the analysis, selecting significant variables, using a different simulation database that contained all possible combinations of intersections and then plotting each input variable with the average output to obtain the pattern in which the frequency of crashes will vary based on the changes in the geometric and traffic characteristics of the intersections. The patterns indicated that an increase in the number of lanes of the major roadway, lanes of the minor roadway and the AADT on the major roadway leads to an increased crashes of all types, whereas an increase in protected left turning lanes on the major road increases the rear end and sideswipe crashes but decreases the angle, turning and overall crash frequencies. The analyses performed in this thesis were possible due to a diligent data collection effort. Traffic and geometric characteristics were obtained from multiple sources for 1562 signalized intersections in Brevard, Hillsborough, Miami-Dade, Seminole and Orange counties and the city of Orlando in Florida. The crash database for these intersections contained 27,044 crashes. This research sheds a light on the characteristics of different types of crashes. The method used in classifying crashes into their respective collision types provides a deeper insight on the characteristics of each type of crash and can be helpful in mitigating a particular type of crash at an intersection. The second analysis carried out has a three fold advantage. First, it identifies if an intersection can be considered safe for different crash types. Second, it accurately predicts the frequencies of total, rear end, angle, sideswipe and turn crashes. Lastly, it identifies the traffic and geometric characteristics of signalized intersections that affect each of these crash types. Thus the models developed in this thesis can be used to identify the specific problems at an intersection, and identify the factors that should be changed to improve its safety
M.S.C.E.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering
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Книги з теми "Angle of sideslip"

1

Whipple, Raymond D. Low-speed aerodynamic characteristics of a 1/8-scale X-29A airplane model at high angles of attack and sideslip. Hampton, Va: Langley Research Center, 1986.

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2

A, Whitmore Stephen, and Dryden Flight Research Facility, eds. A preliminary look at techniques used to obtain airdata from flight at high angles of attack. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1990.

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3

Applin, Zachary T. Wing pressure distributions from subsonic tests of a high-wing transport model. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Applin, Zachary T. Wing pressure distributions from subsonic tests of a high-wing transport model. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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5

Ross, Holly M. Low-speed wind-tunnel investigation of the stability and control characteristics of a series of flying wings with sweep angles of 70 ̊. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Ross, Holly M. Low-speed wind-tunnel investigation of the stability and control characteristics of a series of flying wings with sweep angles of 70 ̊. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Ross, Holly M. Low-speed wind-tunnel investigation of the stability and control characteristics of a series of flying wings with sweep angles of 70 ̊. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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8

Ross, Holly M. Low-speed wind-tunnel investigation of the stability and control characteristics of a series of flying wings with sweep angles of 70 ̊. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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9

J, Bjarke Lisa, and Hugh L. Dryden Flight Research Center., eds. Flow-visualization study of the X-29A aircraft at high angles of attack using a 1/48-scale model. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Center, 1994.

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10

J, Bjarke Lisa, and Hugh L. Dryden Flight Research Center., eds. Flow-visualization study of the X-29A aircraft at high angles of attack using a 1/48-scale model. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Center, 1994.

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Частини книг з теми "Angle of sideslip"

1

Kwon, Baek-soon, and Kyongsu Yi. "Vehicle Sideslip Angle Estimation Using Disturbance Observer." In Lecture Notes in Mechanical Engineering, 1584–92. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_181.

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2

Ling, Jie, Hui Chen, and Fan Xu. "Estimation of Vehicle Sideslip Angle with Adaptation to Road Bank Angle and Roll Angle." In Lecture Notes in Electrical Engineering, 403–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45043-7_41.

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3

Yang, Guibing, Chunguang Liu, and Dingzhe Qin. "Estimation of Electric Drive Vehicle Sideslip Angle Based on EKF." In Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation, 695–702. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49367-0_67.

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4

Pieralice, Cristiano, Basilio Lenzo, Francesco Bucchi, and Marco Gabiccini. "Vehicle Sideslip Angle Estimation Using Kalman Filters: Modelling and Validation." In Mechanisms and Machine Science, 114–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03320-0_12.

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5

Cheli, F., D. Ivone, and E. Sabbioni. "Smart Tyre Induced Benefits in Sideslip Angle and Friction Coefficient Estimation." In Sensors and Instrumentation, Volume 5, 73–83. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15212-7_9.

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6

Gai, Jiangtao, Yue Ma, Xuzhao Hou, Gen Zeng, and Shumin Ruan. "Research on Sideslip Angle Estimation and Prediction for Electric Tracked Vehicle." In Lecture Notes in Electrical Engineering, 576–83. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6226-4_57.

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7

Todoruţ, Adrian, and Nicolae Cordoş. "Evaluation of the Vehicle Sideslip Angle According to Different Road Conditions." In Proceedings of the 4th International Congress of Automotive and Transport Engineering (AMMA 2018), 814–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94409-8_95.

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8

Milanese, Mario, C. Novara, and I. Gerlero. "Robust estimation of vehicle sideslip angle from variables measured by ESC system." In Proceedings, 1063–76. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-08844-6_72.

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9

Xu, Fan, Hui Chen, Xiang Wang, and Junxi Xiong. "Estimation of Sideslip Angle with Tire-Road Friction Adaptation Using Nonlinear Observability Theory." In Proceedings of China SAE Congress 2020: Selected Papers, 627–53. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-2090-4_38.

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10

Xie, Huawei, Junqing Han, Bin Li, and Wei Li. "Sideslip Angle Compensation Based Adaptive Neural Network Path Tracking Control for Underactuated Ship." In Proceedings of 2022 International Conference on Autonomous Unmanned Systems (ICAUS 2022), 2208–20. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0479-2_206.

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Тези доповідей конференцій з теми "Angle of sideslip"

1

Stephant, Joanny, Ali Charara, and Dominique Meizel. "Vehicle sideslip angle observers." In 2003 European Control Conference (ECC). IEEE, 2003. http://dx.doi.org/10.23919/ecc.2003.7086497.

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2

Liu, Wei, Lu Xiong, Xin Xia, and Zhuoping Yu. "Vehicle Sideslip Angle Estimation: A Review." In WCX World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-0569.

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3

Carlos Daniel Reyes Bautista, Pablo Siqueira Meirelles, and Olmer Garcia Bedoya. "SIDESLIP ANGLE ESTIMATION FOR GROUND VEHICLES." In 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-2715.

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4

Ryu, Jihan, Flavio Nardi, and Nikolai Moshchuk. "Vehicle Sideslip Angle Estimation and Experimental Validation." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64466.

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This paper presents a comparison study of three different methods for the estimation of vehicle’s lateral velocity: one based on algebraic relationships, a second based on a dynamic observer, and lastly one based on kinematic equations. All methods are based on the implementation of an experimental nonlinear model that relates the front and rear axles’ lateral forces to their respective side slip angles. These nonlinear models include the effects of different surface coefficients of friction, and all three methods include a real time estimation of the surface coefficient of friction based on standard production sensors. Real time estimation performance of the proposed observers is compared and evaluated based on experimental implementation on a series production vehicle. Vehicle dynamic tests include highly dynamic maneuvers such as slaloms, single and double lane changes, fishhooks on test surfaces such as ice, snow, gravel, and wet/dry asphalt.
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5

Botha, Theunis R., and Pieter S. Els. "Vehicle Sideslip Estimation Using Unscented Kalman Filter, AHRS and GPS." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70875.

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A vehicle’s sideslip angle is an important parameter for both vehicle control and tyre property estimation. This paper details the method of determining a vehicles sideslip angle using an Attitude Heading Reference System (AHRS) and a Global Position System (GPS) in conjunction with the Unscented Kalman Filter (UKF). The addition of a single GPS antenna and the AHRS provides the ability to directly estimate the sideslip angle. Incorporating this direct measurement, as well as the summation of the gravity and gyro-compensated lateral acceleration to provide lateral velocity, allows the continuous and drift free estimation of the sideslip angle. The method is evaluated in simulation, using a validated non-linear full vehicle ADAMS model with added sensor noise. The estimated sideslip angle compares well against the simulated vehicle’s sideslip angle.
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6

Yoon, Jong-Hwa, and Huei Peng. "Vehicle Sideslip Angle Estimation Using Two Single-Antenna GPS Receivers." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4249.

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Knowing vehicle sideslip angle accurately is critical for active safety systems such as Electronic Stability Control (ESC). Vehicle sideslip angle can be measured through optical speed sensors, or dual-antenna GPS. These measurement systems are costly (∼$5k to $100k), which prohibits wide adoption of such systems. This paper demonstrates that the vehicle sideslip angle can be estimated in real-time by using two low-cost single-antenna GPS receivers. Fast sampled signals from an Inertial Measurement Unit (IMU) compensate for the slow update rate of the GPS receivers through an Extended Kalman Filter (EKF). Bias errors of the IMU measurements are estimated through an EKF to improve the sideslip estimation accuracy. A key challenge of the proposed method lies in the synchronization of the two GPS receivers, which is achieved through an extrapolated update method. Analysis reveals that the estimation accuracy of the proposed method relies mainly on vehicle yaw rate and longitudinal velocity. Experimental results confirm the feasibility of the proposed method.
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7

Milanese, Mario, Ilario Gerlero, and Carlo Novara. "Effective Vehicle Sideslip Angle Estimation using DVS Technology." In SAE 2014 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2014. http://dx.doi.org/10.4271/2014-01-0084.

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8

Kumar, Vivek, Alakesh Chandra Mandal, and Kamal Poddar. "Video: Effect of sideslip angle on vortex breakdown." In 73th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2020. http://dx.doi.org/10.1103/aps.dfd.2020.gfm.v0031.

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9

Busnelli, Fabio, Giulio Panzani, Matteo Corno, and Sergio M. Savaresi. "Two-wheeled vehicles black-box sideslip angle estimation." In 2017 IEEE 56th Annual Conference on Decision and Control (CDC). IEEE, 2017. http://dx.doi.org/10.1109/cdc.2017.8263689.

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10

Stephant, J., A. Charara, and D. Meizel. "Linear observers for vehicle sideslip angle : experimental validation." In 2004 IEEE International Symposium on Industrial Electronics. IEEE, 2004. http://dx.doi.org/10.1109/isie.2004.1571831.

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Звіти організацій з теми "Angle of sideslip"

1

Event-Triggered Adaptive Robust Control for Lateral Stability of Steer-by-Wire Vehicles with Abrupt Nonlinear Faults. SAE International, July 2022. http://dx.doi.org/10.4271/2022-01-5056.

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Because autonomous vehicles (AVs) equipped with active front steering have the features of time varying, uncertainties, high rate of fault, and high burden on the in-vehicle networks, this article studies the adaptive robust control problem for improving lateral stability in steer-by-wire (SBW) vehicles in the presence of abrupt nonlinear faults. First, an upper-level robust H∞ controller is designed to obtain the desired front-wheel steering angle for driving both the yaw rate and the sideslip angle to reach their correct values. Takagi-Sugeno (T-S) fuzzy modeling method, which has shown the extraordinary ability in coping with the issue of nonlinear, is applied to deal with the challenge of the changing longitudinal velocity. The output of the upper controller can be calculated by a parallel distributed compensation (PDC) scheme. Then an event-triggered adaptive fault-tolerant lower controller (ET-AFTC) is proposed to drive the whole SBW system driving the desired steering angle offered by the upper controller with fewer communication resources and strong robustness. By employing a backstepping technique, the tracking performance is improved. The dynamic surface control (DSC) approach is used to avoid the problem of repeated differentiations, and Nussbaum function is adopted to overcome the difficulty of unknown nonlinear control gain. Both the stability of the upper and lower controllers can be guaranteed by Lyapunov functions. Finally, the simulations of Matlab/Simulink are given to show that the proposed control strategy is effectively able to deal with the abrupt nonlinear fault via less communication resources and perform better in ensuring the yaw stability of the vehicle.
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