Bibliographies thématiques / Longitudinal Stability Control

Littérature scientifique sur le sujet « Longitudinal Stability Control »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 11 mars 2023

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Articles de revues sur le sujet "Longitudinal Stability Control"

Houston, S. S. « Identification of Autogyro Longitudinal Stability and Control Characteristics ». Journal of Guidance, Control, and Dynamics 21, n^o 3 (mai 1998) : 391–99. http://dx.doi.org/10.2514/2.4271.

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Bloy, A. W. « An Aircraft Longitudinal Static Stability and Control Experiment ». International Journal of Mechanical Engineering Education 24, n^o 3 (juillet 1996) : 183–90. http://dx.doi.org/10.1177/030641909602400305.

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OHMOTO, Terunori, et Muneo HIRANO. « STABILITY MECHANISM AND CONTROL OF LONGITUDINAL VORTEX STREETS ». PROCEEDINGS OF HYDRAULIC ENGINEERING 37 (1993) : 495–501. http://dx.doi.org/10.2208/prohe.37.495.

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Walker, D. J., et P. Perfect. « LONGITUDINAL STABILITY AND CONTROL OF LARGE TILT-ROTOR AIRCRAFT ». IFAC Proceedings Volumes 40, n^o 7 (2007) : 413–18. http://dx.doi.org/10.3182/20070625-5-fr-2916.00071.

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Taha, Haithem E., Craig A. Woolsey et Muhammad R. Hajj. « Geometric Control Approach to Longitudinal Stability of Flapping Flight ». Journal of Guidance, Control, and Dynamics 39, n^o 2 (février 2016) : 214–26. http://dx.doi.org/10.2514/1.g001280.

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Ahangarnejad, Arash Hosseinian, et Stefano Melzi. « Active longitudinal load transfer control for improving vehicle's stability ». International Journal of Vehicle Performance 5, n^o 1 (2019) : 2. http://dx.doi.org/10.1504/ijvp.2019.097091.

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Bai, Yunlong, Gang Li, Hongyao Jin et Ning Li. « Research on Lateral and Longitudinal Coordinated Control of Distributed Driven Driverless Formula Racing Car under High-Speed Tracking Conditions ». Journal of Advanced Transportation 2022 (11 août 2022) : 1–15. http://dx.doi.org/10.1155/2022/7344044.

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Aiming at the problem that it is difficult to ensure the trajectory tracking accuracy and driving stability of the distributed driven driverless formula racing car under high-speed tracking conditions, a lateral and longitudinal coordinated control strategy is proposed. Based on the adaptive model predictive control theory, the lateral motion controller is designed, and the prediction time domain of the controller is changed in real time according to the change of vehicle speed. Based on the sliding mode variable structure control theory, a longitudinal motion controller is designed to accurately track the desired vehicle speed. Considering the coupling between the lateral and longitudinal controls, the lateral controller inputs the longitudinal speed and displacement of the vehicle, using the feedback mechanism to update the prediction model in real time, the longitudinal controller takes the front wheel angle as the input, the driving torque is redistributed through the differential drive control, and the lateral and longitudinal coordinated control is carried out to improve the trajectory tracking accuracy and driving stability. The typical working conditions are selected for co-simulation test verification. The results show that the lateral and longitudinal coordinated control strategy can effectively improve the vehicle trajectory tracking control accuracy and driving stability.

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Huang, Man Hong, Huan Shen et Yun Sheng Tan. « Vehicle Direct Yaw Moment Control with Longitudinal Forces Distribution ». Applied Mechanics and Materials 709 (décembre 2014) : 331–34. http://dx.doi.org/10.4028/www.scientific.net/amm.709.331.

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In this paper, a vehicle stability control system is proposed to improve vehicle comfort, handling and stability. The control system includes reference model, DYC controller and Distributer. Reference model is used to obtain the desired yaw rate. DYC controller determines the desired yaw moment by means of sliding-mode technique. Distributer, based on maneuverability and comfort, distributes driving torque or braking torque according to the desired yaw rate. Simulation result shows that the proposed control algorithm can improve vehicle handling and stability effectively.

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Li, Mei Hong, Jian Yin, Xue Yang Sun, Jin Xiang Xu et Mei Mei Zhang. « Design of Missile Longitudinal Control System Based on Backstepping Control ». Applied Mechanics and Materials 496-500 (janvier 2014) : 1401–6. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1401.

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Missile control system is not block strict feedback system which is suitable to use backstepping method. So in this paper, a backstepping control method is proposed to design a missile longitudinal autopilot and is proved to be asymptotically stable by Lyapunov stability theory. The simulation results show that the designed system can still track commands quickly and accurately and is robust with aerodynamic perturbation and control input saturation.

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Thèses sur le sujet "Longitudinal Stability Control"

Fino, Peter C. « Longitudinal Locomotor and Postural Control Following Mild Traumatic Brain Injury ». Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73775.

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Millions of people sustain a mild traumatic brain injury (concussion) each year. While most clinical signs and symptoms resolve within 7-10 days for the majority of typical concussions, some gait and balance tasks have shown abnormalities lasting beyond the resolution of clinical symptoms. These abnormalities can persist after athletes have been medically cleared for competition, yet the implications of such changes are unclear. Most prior research has examined straight gait and standard measures of balance, yet there is a lack of knowledge regarding potential persistent effects on non-straight maneuvers or on indicators of motor control variability or complexity. To expand the knowledge of post-concussion locomotor and postural changes, this investigation examined the recovery of recently concussed athletes longitudinally, over the course of one year, in three domains: 1) path selection and body kinematics during turning gait, 2) non-linear local dynamic stability during straight gait, and 3) postural control complexity during quiet standing. Compared to matched health controls, concussed athletes exhibited significant and persistent differences in turning kinematics, local dynamic stability, and postural complexity over the initial six weeks following injury. These motor differences may increase the risk of injury to concussed athletes who are cleared to return to play. Given the persistent nature of these effects, future clinical tests may benefit from incorporating gait assessments before returning athletes to competition. Future research should prospectively and longitudinally monitor locomotor and postural control in conjunction with structural and functional changes within the brain to better understand the pathophysiology of concussions and potential rehabilitation strategies.
Ph. D.

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Camillo, Giannino Ponchio. « Longitudinal stability analysis and control of an airbreathing hypersonic vehicle ». Instituto Tecnológico de Aeronáutica, 2014. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3154.

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This work presents the open-loop stability analysis and an active control strategy for an airbreathing hypersonic vehicle. The 14-XB, a bidimensional flow airframe derived from the Brazilian 14-X Aerospace Hypersonic Vehicle, is adopted as study platform. In order to perform such analyses, a simulation mathematical model of the airframe longitudinal forces and moments is obtained using perfect gas equations, after considering the relevance of the real gas hypotheses for the expected Mach number range and verifying that the simpler formulation is sufficient. An all-moving horizontal tail is designed in order to enable the aircraft trimming. The horizontal tail design considered simple constraints based on static analysis, and the same gas equations as those used for the airframe study. In order to analyze the aircraft';s dynamic behavior, a Six-Degree-of-Freedom set of equations of motion considering a spherical, rotating Earth is presented in detail, and the necessary conditions to have adequate longitudinal trimming in this scenario are discussed. The open-loop stability of the 14-XB with the designed horizontal tail is assessed through eigenvalue analysis and numerical flight simulations with the horizontal tail fixed at a trim position. Having observed that the aircraft presents unstable long-term natural modes, an active control strategy is suggested in order to stabilize the vehicle and track a desired flight path angle, assuming that thrust is constant and the control surface is an all-moving horizontal tail. The suggested control structure presents pitch stability augmentation system and flight path angle compensator. Optimal gains are calculated using linear quadratic design, along with a gain-scheduling strategy based on simultaneous control design, and the resulting controller presents proper results.

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Pienaar, D. van V. « Longitudinal stability and control analysis and parameter sensitivity investigation of fixed wing aircraft in ground proximity using various aerodynamic approaches ». Doctoral thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/5486.

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Summary in English.
The investigation of the stability of longitudinal motion of fixed wing aircraft in ground proximity presented here focuses on rectangular wing and tail configurations similar to that of the Piper Cherokee PA-28-180. The majority of our results pertain to the height range down to one quarter of the wing span, and th main objectives of the investigation were the following: to reveal the physical nature and causes of the instability encountered in the close ground proximity; to assess the influence the design parameters such as the centre of the mass placement, tail length, tail height and wing aspect ration have on the stability of longitudinal motion; and to suggest a feedback control strategy that would alleviate the instability.

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Guillet, Audrey. « Commande locale décentralisée de robots mobiles en formation en milieu naturel ». Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22609/document.

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La problématique étudiée dans cette thèse concerne le guidage en formation d’une flotte de robots mobiles en environnement naturel. L’objectif poursuivi par les robots est de suivre une trajectoire connue (totalement ou partiellement) en se coordonnant avec les autres robots pour maintenir une formation décrite comme un ensemble de distances désirées entre les véhicules. Le contexte d’évolution en environnement naturel doit être pris en compte par les effets qu’il induit sur le déplacement des robots. En effet, les conditions d’adhérence sont variables et créent des glissements significatifs des roues sur le sol. Ces glissements n’étant pas directement mesurables, un observateur est mis en place, permettant d’obtenir une estimation de leur valeur. Les glissements sont alors intégrés au modèle d’évolution, décrivant ainsi un modèle cinématique étendu. En s’appuyant sur ce modèle, des lois de commande adaptatives sur l’angle de braquage et la vitesse d’avance d’un robot sont alors conçues indépendamment, asservissant respectivement son écart latéral à la trajectoire et l’interdistance curviligne de ce robot à une cible. Dans un second temps, ces lois de commande sont enrichies par un algorithme prédictif, permettant de prendre en compte le comportement de réponse des actionneurs et ainsi d’éviter les erreurs conséquentes aux retards de la réponse du système aux commandes. À partir de la loi de commande élémentaire en vitesse permettant d’assurer un asservissement précis d’un robot par rapport à une cible, une stratégie de commande globale au niveau de la flotte est établie. Celle-ci décline l’objectif de maintien de la formation en consigne d’asservissement désiré pour chaque robot. La stratégie de commande bidirectionnelle conçue stipule que chaque robot définit deux cibles que sont le robot immédiatement précédent et le robot immédiatement suivant dans la formation. La commande de vitesse de chaque robot de la formation est obtenue par une combinaison linéaire des vitesses calculées par la commande élémentaire par rapport à chacune des cibles. L’utilisation de coefficients de combinaison constants au sein de la flotte permet de prouver la stabilité de la commande en formation, puis la définition de coefficients variables est envisagée pour adapter en temps réel le comportement de la flotte. La formation peut en effet être amenée à évoluer, notamment en fonction des impératifs de sécurisation des véhicules. Pour répondre à ce besoin, chaque robot estime en temps réel une distance d’arrêt minimale en cas d’urgence et des trajectoires d’urgence pour l’évitement du robot précédent. D’après la configuration de la formation et les comportements d’urgence calculés, les distances désirées au sein de la flotte peuvent alors être modifiées en ligne afin de décrire une configuration sûre de la formation
This thesis focuses on the issue of the control of a formation of wheeled mobile robots travelling in off-road conditions. The goal of the application is to follow a reference trajectory (entirely or partially) known beforehand. Each robot of the fleet has to track this trajectory while coordinating its motion with the other robots in order to maintain a formation described as a set of desired distances between vehicles. The off-road context has to be considered thoroughly as it creates perturbations in the motion of the robots. The contact of the tire on an irregular and slippery ground induces significant slipping and skidding. These phenomena are hardly measurable with direct sensors, therefore an observer is set up in order to get an estimation of their value. The skidding effect is included in the evolution of each robot as a side-slip angle, thus creating an extended kinematic model of evolution. From this model, adaptive control laws on steering angle and velocity for each robot are designed independently. These permit to control respectively the lateral distance to the trajectory and the curvilinear interdistance of the robot to a target. Predictive control techniques lead then to extend these control laws in order to account for the actuators behavior so that positioning errors due to the delay of the robot response to the commands are cancelled. The elementary control law on the velocity control ensures an accurate longitudinal positioning of a robot with respect to a target. It serves as a base for a global fleet control strategy which declines the overall formation maintaining goal in local positioning objective for each robot. A bidirectionnal control strategy is designed, in which each robot defines 2 targets, the immediate preceding and following robot in the fleet. The velocity control of a robot is finally defined as a linear combination of the two velocity commands obtained by the elementary control law for each target. The linear combination parameters are investigated, first defining constant parameters for which the stability of the formation is proved through Lyapunov techniques, then considering the effect of variable coefficients in order to adapt in real time the overall behavior of the formation. The formation configuration can indeed be prone to evolve, for application purposes and to guarantee the security of the robots. To fulfill this latter requirement, each robot of the fleet estimates in real time a minimal stopping distance in case of emergency and two avoidance trajectories to get around the preceding vehicle if this one suddenly stops. Given the initial configuration of the formation and the emergency behaviors calculated, the desired distances between the robots can be adapted so that the new configuration thus described ensures the security of each and every robot of the formation against potential collisions

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Pereira, Natanael de Carvalho. « Desenvolvimento de um sistema de aumento de estabilidade longitudinal de uma aeronave com enflechamento negativo e canard, com ensaios em túnel de vento ». Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-18022016-094528/.

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As pesquisas modernas em aeronáutica envolvem a expansão dos envelopes de vôo, como resultado do desejo de melhorar a manobrabilidade e controlabilidade em operações táticas, e melhorar a segurança do vôo. Esses objetivos podem ser alcançados através do desenvolvimento de sistemas automáticos de controle de vôo. Os sistemas de controle aplicados a aeronaves podem ser desenvolvidos e simulados através de métodos computacionais. No entanto, existem imperfeições na simulação computacional por não se conseguir reproduzir algumas características do vôo real ou devido a simplificações no modelo matemático da aeronave. Desta forma, a construção de um modelo físico de uma aeronave em escala reduzida e a implementação de um controlador a este modelo, torna-se uma ferramenta bastante importante para validar resultados teóricos e métodos computacionais. Os custos associados a estes testes são geralmente muito menores que aqueles dos ensaios em vôo e com maior flexibilidade de instrumentação. Este trabalho descreve a construção de um modelo de aeronave, baseado no X-29, o desenvolvimento de um mecanismo de fixação do modelo ao túnel de vento, tipo rótula, e a implementação de um sistema de aumento de estabilidade longitudinal, através de um sistema de controle automático. O modelo físico possui uma configuração de asa com enflechamento negativo e canard, e que tende a ser inerentemente instável, sendo necessário o auxílio de um sistema de aumento de estabilidade. Testes de estabilidade dinâmica em arfagem foram realizados no túnel de vento em diferentes posições do centro de gravidade. Os parâmetros de estabilidade foram registrados e analisados através de uma curva de ajuste exponencial.
Modern aeronautical research involves flight envelope expansion as the result of a desire for improvement in tactical operation handling qualities and improvement in flight safety. These objectives can be achieved through the development of automatic flight control systems. Aircraft flight control systems can be developed and simulated through computational methods. However, there are imperfections in the computational simulation of flight dynamics due to the difficulty in reproducing real flight conditions or due simplifications in the aircraft mathematical model. The construction of a reduced scale physical aircraft model and the implementation of a controller is a very valuable tool to validate theoretical results and computational methods. The costs associated with these tests are usually much smaller than those associated with full scale flight testing and may offer greater flexibility for instrumentation. The present work describes the construction of an airplane model, based on the X-29, the development of a wind tunnel gimbal type support and the implementation of a longitudinal stability augmentation system using automatic flight control. The model configuration has forward swept wings and canard with a tendency to be inherently unstable and, thus, requiring a stability augmentation system. Pitching dynamic stability tests where conducted in a wind tunnel in different center of gravity positions. Stability parameters were acquired and analyzed by exponential fit curve.

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Richier, Mathieu. « Conception de dispositifs actifs de maintien de stabilité pour les véhicules évoluant en milieux naturels ». Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-01066614.

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La problématique de cette thèse réside dans la caractérisation et le maintien de la stabilité des Véhicules Légers Tout Terrain (VLTT). Elle se concentre plus particulièrement sur le développement de systèmes de sécurité actifs capables à la fois de prévenir le conducteur des risques encourus mais aussi de les limiter afin d'assurer l'évolution du véhicule dans une zone de stabilité prédéfinie. Comme le cadre expérimental privilégié est l'application à la stabilité des quadricycles légers à moteurs, plus connus sous le terme anglophone "quad", une des contraintes du projet a été de se limiter à un système sensoriel bas-coût afin d'être en mesure d'industrialiser un tel système. En premier lieu, les métriques de stabilité (Transfert de Charge Latéral et Longitudinal : TCLa et TCLo) ont été choisies grâce à une étude préliminaire sur la stabilité des VLTT. Par la suite, une modélisation 2D en roulis et en tangage avec la prise en compte des déplacements du pilote sur le véhicule sont présentées, ce qui permet d'estimer respectivement le TCLa et le TCLo uniquement à partir de la mesure de l'accélération latérale et longitudinale. Étant donné que pour la suite des travaux, l'anticipation du risque de renversement latéral est nécessaire, un modèle 2D en lacet du véhicule est proposé afin d'obtenir un modèle analytique décrivant la dynamique latérale du véhicule. La suite du mémoire présente les différentes techniques d'observation proposées pour l'estimation des variables et paramètres non-directement mesurables du modèle en lacet du véhicule et qui influencent sa stabilité latérale : les glissements, les conditions d'adhérence et les inclinaisons du véhicule. Plusieurs observateurs ont été proposés, dont le dernier permet de considérer des conditions d'adhérence différentes entre les essieux avant et arrière en utilisant plus largement les accélérations mesurées. Cela permet d'intégrer les passages de sous- à sur-vireur qu'il est essentiel de considérer quand on étudie la stabilité de ce type de véhicule. Ainsi, l'estimation des glissements est toujours pertinente, ce qui permet d'obtenir par la suite une meilleure prédiction de la métrique de stabilité latérale (TCLa) quel que soit le comportement du véhicule. Puis en s'appuyant sur les estimations des observateurs couplées aux modèles dynamiques du véhicule et sur l'extrapolation des commandes du conducteur sur un horizon de prédiction, il est possible de prédire les évolutions du TCLa. Cette valeur prédite ainsi que les estimations en ligne des métriques de stabilité constituent alors le point d'entrée pour la synthétisation d'un système de sécurité actif dédié aux VLTT. Celui-ci est basé sur la génération d'un retour d'effort au niveau de la gâchette des gaz permettant soit d'informer le pilote du risque encouru par la création d'une sensation de dureté, soit d'imposer le retour complet de la gâchette des gaz, ce qui implique une diminution de la vitesse et donc la réduction du risque. Finalement, dans le cas où il est possible de maîtriser la vitesse du véhicule par l'installation d'un système de rétroaction sur les freins (Quad haut de gamme ou robot mobile), les derniers travaux présentés s'intéressent aux techniques de commande prédictive à modèle afin de calculer en temps-réel la vitesse maximale admissible, qui assure l'évolution du critère de stabilité choisi dans un domaine de stabilité. Les modèles, les observateurs, la prédiction du TCLa et les 2 systèmes de prévention présentés dans ce mémoire ont été validés et testés au travers de simulations avancées et d'essais expérimentaux réalisés sur un quad agricole et un robot autonome. Il apparaît alors qu'en plus d'être efficace pour la prévention des risques de renversement à hautes dynamiques, le système de sécurité est industriellement viable. Cela a été rendu possible grâce à une conception reposant uniquement sur des actionneurs et un système sensoriel, dont les coûts sont en adéquation avec le prix d'un VLTT.

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Denis, Dieumet. « Contribution à la modélisation et à la commande de robots mobiles reconfigurables en milieu tout-terrain : application à la stabilité dynamique d'engins agricoles ». Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22565/document.

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La thématique étudiée dans ce mémoire est axée sur la préservation de la stabilité dynamique de véhicules évoluant en environnement naturel. En effet, la mobilité en milieu tout-terrain est une activité particulièrement pénible et dangereuse en raison de la nature difficile de l'environnement de conduite et de la reconfigurabilité des machines. Le caractère changeant et incertain des interactions rencontrées entre des véhicules à dynamique complexe et variable et leur environnement entraîne régulièrement des risques accrus de renversement et/ou de perte de contrôle (dévalement, dérapage déclenché par une perte soudaine d'adhérence) pour le conducteur. Une forte accidentalité mortelle est, en effet, recensée dans ce secteur, en particulier, dans le milieu agricole ou le renversement de véhicule est classé comme étant la première cause de mortalité au travail. A l'heure actuelle, les approches existantes sur la stabilité d'engins agricoles sont qualifiées à juste titre de passives car elles ne permettent pas d'éviter que les accidents ne se produisent. Par ailleurs, la transposition directe des solutions de sécurité active du secteur de l'automobile (ABS, ESP) s'est révélée inadaptée aux véhicules tout-terrain a cause des hypothèses simplificatrices (routes plates et homogènes, conditions d'adhérence constantes, etc.) dont souffre la conception de ces dispositifs. Ainsi, le développement de systèmes actifs de sécurité prenant en compte les spécificités de la conduite en milieu tout-terrain se révèle être la meilleure voie d'amélioration à suivre. Eu égard à ces circonstances, ce projet se propose d'adresser cette problématique en étudiant des métriques de stabilité pertinentes permettant d'estimer et d'anticiper en temps réel les risques afin de permettre des actions correctives pour la préservation de l'intégrité des machines tout-terrain. Afin de faciliter l'industrialisation du dispositif actif de sécurité conçu, l'une des contraintes sociétales et commerciales de ce projet a été l'utilisation de capteurs compatibles avec le coût des machines visées. L'objectif ambitieux de cette étude a été atteint par différentes voies. En premier lieu, une approche de modélisation multi-échelle a permis de caractériser l'évolution dynamique de véhicules en milieu tout-terrain. Cette approche à dynamique partielle a offert l'avantage de développer des modèles suffisamment précis pour être représentatifs du comportement réel de l'engin mais tout en présentant une structure relativement simple permettant la synthèse d'asservissements performants. Puis, une étude comparative des avantages et des inconvénients des trois grandes familles de métriques répertoriées dans la littérature a permis de mettre en exergue l'intérêt des métriques analytiques à modèle dynamique par rapport aux catégories de critères de stabilité dits statiques et empiriques. Enfin, l'analyse approfondie des métriques dynamiques a facilité le choix de trois indicateurs (Lateral and Longitudinal Load Transfer (LLT), Force Angle Stability Measurement (FASM) et Dynamic Energy Stability Measurement (DESM)) qui sont représentatifs d'un risque imminent de renversement du véhicule. La suite du mémoire s'appuie sur la théorie d'observation pour l'estimation en ligne des variables non directement mesurables en milieu tout-terrain telles que les rigidités de glissement et dérive du pneumatique. Jumelée aux différents modèles dynamiques du véhicule, la synthèse d'observateurs a permis donc d'estimer en temps réel les efforts d'interaction pneumatiques-sol nécessaires à l'évaluation des indicateurs d'instabilité. Le couplage de ces modèles multi-échelles à la théorie d'observation a ainsi constitué un positionnement original à même de briser la complexité de la caractérisation de la stabilité de véhicules à dynamiques complexes et incertaines. (...)
This work is focused on the thematic of the maintenance of the dynamic stability of off-road vehicles. Indeed, driving vehicles in off-road environment remains a dangerous and harsh activity because of the variable and bad grip conditions associated to a large diversity of terrains. Driving difficulties may be also encountered when considering huge machines with possible reconfiguration of their mechanical properties (changes in mass and centre of gravity height for instance). As a consequence, for the sole agriculture sector, several fatal injuries are reported per year in particular due to rollover situations. Passive protections (ROllover Protective Structure - ROPS) are installed on tractors to reduce accident consequences. However, protection capabilities of these structures are very limited and the latter cannot be embedded on bigger machines due to mechanical design limitations. Furthermore, driving assistance systems (such as ESP or ABS) have been deeply studied for on-road vehicles and successfully improve safety. These systems usually assume that the vehicle Center of Gravity (CG) height is low and that the vehicles are operating on smooth and level terrain. Since these assumptions are not satisfied when considering off-road vehicles with a high CG, such devices cannot be applied directly. Consequently, this work proposes to address this research problem by studying relevant stability metrics able to evaluate in real time the rollover risk in order to develop active safety devices dedicated to off-road vehicles. In order to keep a feasible industrialization of the conceived active safety device, the use of compatible sensors with the cost of the machines was one of the major commercial and societal requirements of the project. The ambitious goal of this study was achieved by different routes. First, a multi-scale modeling approach allowed to characterize the dynamic evolution of off-road vehicles. This partial dynamic approach has offered the advantage of developing sufficiently accurate models to be representative of the actual behavior of the machine but having a relatively simple structure for high-performance control systems. Then, a comparative study of the advantages and drawbacks of the three main families of metrics found in the literature has helped to highlight the interest of dynamic stability metrics at the expense to categories of so-called static and empirical stability criteria. Finally, a thorough analysis of dynamic metrics has facilitated the choice of three indicators (Longitudinal and Lateral Load Transfer (LLT), Force Angle Stability Measurement (FASM) and Dynamic Energy Stability Measurement (DESM)) that are representative of an imminent rollover risk. The following of the document is based on the observation theory for estimating online of variables which are not directly measurable in off-road environment such as slip and cornering stiffnesses. Coupled to the dynamic models of the vehicle, the theory of observers has helped therefore to estimate in real time the tire-soil interaction forces which are necessaries for evaluating indicators of instability. The coupling of these multiscale models to the observation theory has formed an original positioning capable to break the complexity of the characterization of the stability of vehicles having complex and uncertain dynamics. (...)

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Polack, Philip. « Cohérence et stabilité des systèmes hiérarchiques de planification et de contrôle pour la conduite automatisée ». Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM025/document.

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La voiture autonome pourrait réduire le nombre de morts et de blessés sur les routes tout en améliorant l'efficacité du trafic. Cependant, afin d'assurer leur déploiement en masse sur les routes ouvertes au public, leur sécurité doit être garantie en toutes circonstances. Cette thèse traite de l'architecture de planification et de contrôle pour la conduite automatisée et défend l'idée que l'intention du véhicule doit correspondre aux actions réalisées afin de garantir la sécurité à tout moment. Pour cela, la faisabilité cinématique et dynamique de la trajectoire de référence doit être assurée. Sinon, le contrôleur, aveugle aux obstacles, n'est pas capable de la suivre, entraînant un danger pour la voiture elle-même et les autres usagers de la route. L'architecture proposée repose sur la commande à modèle prédictif fondée sur un modèle bicyclette cinématique afin de planifier des trajectoires de référence sûres. La faisabilité de la trajectoire de référence est assurée en ajoutant une contrainte dynamique sur l'angle au volant, contrainte issue de ces travaux, afin d'assurer que le modèle bicyclette cinématique reste valide. Plusieurs contrôleurs à haute-fréquence sont ensuite comparés afin de souligner leurs avantages et inconvénients. Enfin, quelques résultats préliminaires sur les contrôleurs à base de commande sans modèle et leur application au contrôle automobile sont présentés. En particulier, une méthode efficace pour ajuster les paramètres est proposée et implémentée avec succès sur la voiture expérimentale de l'ENSIAME en partenariat avec le laboratoire LAMIH de Valenciennes
Autonomous vehicles are believed to reduce the number of deaths and casualties on the roads while improving the traffic efficiency. However, before their mass deployment on open public roads, their safety must be guaranteed at all time.Therefore, this thesis deals with the motion planning and control architecture for autonomous vehicles and claims that the intention of the vehicle must match with its actual actions. For that purpose, the kinematic and dynamic feasibility of the reference trajectory should be ensured. Otherwise, the controller which is blind to obstacles is unable to track it, setting the ego-vehicle and other traffic participants in jeopardy. The proposed architecture uses Model Predictive Control based on a kinematic bicycle model for planning safe reference trajectories. Its feasibility is ensured by adding a dynamic constraint on the steering angle which has been derived in this work in order to ensure the validity of the kinematic bicycle model. Several high-frequency controllers are then compared and their assets and drawbacks are highlighted. Finally, some preliminary work on model-free controllers and their application to automotive control are presented. In particular, an efficient tuning method is proposed and implemented successfully on the experimental vehicle of ENSIAME in collaboration with the laboratory LAMIH of Valenciennes

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Tsung-HsienLi et 李聰賢. « Longitudinal Stability Control Design for the Flying Wing ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/24924446406879533272.

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碩士
國立成功大學
航空太空工程學系碩博士班
101
In this thesis, the major objective is to synthesizes the longitudinal stability control design for a flying-wing type aircraft. The flying-wing geometrical configuration is established and the digital DATCOM program is used to estimate its aerodynamic coefficients in order to analyze its stability characteristics and tracking performance. The results show that its stability characteristics is poor and a control system is needed to be designed in order to enhance the stability. It is known that PID method is very useful for control design, as it can improve the transient state characteristics and track a constant command input. However, when the system is multiple-input and multiple-output (MIMO) as for the case in this thesis, it is unhelpful to use the conventional root locus method. Therefore, in this thesis, the eigenvalue assignment method which can be used in the multiple-input and multiple-output (MIMO) system is adopted. In using the eigenvalue assignment method, the characteristic equation of the system is established and the coefficients are compared with those of the polynomial equation formed from the desired eigenvalues. A set of nonlinear algebraic equations are thus established for the control gains and solved by using the Newton-Raphson iterative method. After the gains are determined, the feedback control system is simulated. From the simulation results, it is found that the output response in longitudinal system of flying wing has been significantly improved with the PID control.

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Montani, Margherita. « Development of a hierarchical architecture for real-time autonomous vehicle control ». Doctoral thesis, 2022. http://hdl.handle.net/2158/1276700.

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The autonomous driving is one of the automotive research challenges of the last years, and even if a lot of technologies steps forward have been taken, it remains an open research issue. So, the aim of this PhD thesis was to improve the current level of dynamic control of an autonomous car using commercial hardware and sensor technologies and respecting their functioning constraints. The research focused on the development and implementation of different logic layers inside the autonomous car framework. The first step was to develop an algorithm to localize the vehicle and estimate the car speeds. In this way, the signals required for the correct operation of the control architecture are added to the input signals provided by the sensors. Two of the most adopted technologies were tested. However, the estimation errors made were too high to guarantee the desired level of operation of the control systems. Therefore, based on the characteristics and issues given by the design of these systems, we developed a vehicle speeds estimator consisting of a combination of both. In this way, even in high non-linear dynamic conditions, the errors on the estimation were reduced, improving the car localization and functioning of the control algorithms. Then, an on-line Path Planning was developed able to define the performances that maximize the car speed in a known track. The focuses were: to ensure a real-time trajectory calculation (updating it with the current vehicle dynamics and environmental conditions); and allow computational cost compatible with the correct functioning of the other systems involved. For this reason, it was chosen an optimization algorithm that allows to maintain a linear cost function simplifying the car model and limiting the computational times. However, in order to ensure the most correct representation of vehicle dynamics a more accurate modelling of the car GG-V has been implemented as constraint equations. Once defined the trajectory, a high-level controller was developed to track the dynamic performances provided by the Path Planning. So, was implemented an algorithm that ensures a feed-back control of the Steering Wheel Angle (SWA), accelerator and brake pedal by dividing the later dynamic model from the longitudinal one. In addition, was added a feed-forward control that tracks the lateral and longitudinal acceleration calculated by the planner. Thus, the performances tracking delay and the feed-back control modelling errors were reduced. Finally, to enhance the lateral and longitudinal stability, an Electronic Stability System (ESC) and Anti-lock Brake System (ABS) controls are developed with the aim of improve the current commercial systems performances. About the lateral stability control, a tracking controller was implemented to define the brake input corrections that must be added to the ones established by the Trajectory Tracking to follow reference yaw rate and side slip angle. Instead, to ensure that the wheels don’t lock, a discrete control allows the wheels to follow a target longitudinal speed. In this way, it was found that comparing with the standard ABS the tuning process takes less time and the brake performances are increased, in terms of reduction of the brake distance; and increased stability during full braking manoeuvres. The different layers ware developed independently achieving their own performance improvement and then are integrated together with specific interfaces. Furthermore, two mathematical modelling types were made starting from available experimental data: a sensor characterization to ensure the input signals have their delays, noise and sample time; and a transfer function model of the Brake-By-Wire system developed by Meccanica 42 srl, to ensure actuation outputs delay and constraints. Thus, the real exchange of signals between the architecture developed and the vehicle model is ensured, and the correct operation of the controls once implemented in the car is verified. A real-time static simulator placed at Meccanica 42 srl is used to develop and test the architecture and compare the performances obtained with the ones of a driver. The results showed that: it was possible to obtain an optimisation and tracking of the trajectory that update in real-time taking into account the current dynamic conditions; some good improvements were achieved both with regard to the estimation of the states and the stability of the vehicle; and it was possible to integrate the various layers together guaranteeing satisfactory dynamic performance even if worse than the individual one.

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Livres sur le sujet "Longitudinal Stability Control"

H, Hardy Gordon, et United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., dir. Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA). [Washington, D.C.] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Ostroff, Aaron J. Longitudinal-control design approach for high-angle-of-attack aircraft. Hampton, Va : Langley Research Center, 1993.

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S, Proffitt Melissa, et United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., dir. Longitudinal-control design approach for high-angle-of-attack aircraft. [Washington, DC] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Ostroff, Aaron J. Longitudinal-control design approach for high-angle-of-attack aircraft. [Washington, DC] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Suit, William T. Lateral and longitudinal stability and control parameters for the space shuttle Discovery as determined from flight test data. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1988.

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Sanjay, Garg, et United States. National Aeronautics and Space Administration., dir. Stable H(infinity) controller design for the longitudinal dynamics of an aircraft. [Washington, DC] : National Aeronautics and Space Administration, 1995.

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Stephenson, Jack D. Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA). Moffett Field, Calif : Ames Research Center, 1989.

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Mooij, H. A. Criteria for Low-Speed Longitudinal Handling Qualities. Dordrecht : Springer Netherlands, 1985.

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Ostroff, Aaron J. Redesign of a variable-gain output feedback longitudinal controller flown on the High-Alpha Research Vehicle (HARV). Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1998.

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Batterson, James G. Estimation of longitudinal stability and control derivatives for an icing research aircraft from flight data. Hampton, Va : Langley Reserach Center, 1989.

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Plus de sources

Chapitres de livres sur le sujet "Longitudinal Stability Control"

Sadraey, Mohammad H. « Longitudinal Stability ». Dans Flight Stability and Control, 59–107. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18765-0_3.

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Sadraey, Mohammad H. « Longitudinal Control ». Dans Flight Stability and Control, 159–89. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18765-0_5.

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Gratton, Guy. « Longitudinal Stability and Control ». Dans Initial Airworthiness, 241–58. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75617-2_12.

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Gratton, Guy. « Longitudinal Stability and Control ». Dans Initial Airworthiness, 201–15. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11409-5_12.

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Zhang, Xudong, et Dietmar Göhlich. « Integrated traction control strategy for 4-motorized-wheels electric vehicles with improvement of economy and longitudinal driving stability ». Dans Advanced Vehicle Control AVEC’16, 717–22. CRC Press/Balkema, P.O. Box 11320, 2301 EH Leiden, The Netherlands, e-mail : Pub.NL@taylorandfrancis.com, www.crcpress.com – www.taylorandfrancis.com : Crc Press, 2016. http://dx.doi.org/10.1201/9781315265285-113.

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Keller, Dennis. « Numerical Approach Aspects for the Investigation of the Longitudinal Static Stability of a Transport Aircraft with Circulation Control ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 13–22. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03158-3_2.

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Chen, Lin, Yaan Hu, Zhonghua Li et Chao Guo. « Study on the Mechanism of Water Loss and Capsizing of Multi - point Suspension Ship Lift ». Dans Lecture Notes in Civil Engineering, 668–79. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_58.

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AbstractThe stability of ship lift chamber operation has always been the key factor restricting the development of ship lift, which has not been well solved for a long time. With the development of upsizing of ships, the super-huge fully balanced ship lift with hoisting steel wire rope over 10000–15000 t is the development trend in the future. The mechanism of water loss and capsizing of multi-point ship lift is the most key scientific problem, and the most core technical problem is the layout and operation control of ship lift system. A generalized physical model of ship lift with the model scale of 1:33 was established to study the influence of multiple factors on water loss stability of ship chamber, such as gravity counterweight/torque counterweight ratio, water leakage flow, the position of suspension points among the chamber, quantity of the suspension points, and so on. Secondly, the structural dynamics equations of hoisting system is deduced in detail, considering the water fluctuation in the process of water loss caused by longitudinal capsizing moment influence on balance system, and research on the transient dynamic characteristics of hoisting system of the filtration process, determine the ship chamber conditions of stability for the trim through the Lyapunov stability criterion. The optimization calculation model of ship lift mechanical suspension system layout under the action of multiple constraints was established, and the effective measures will be given to improve the pitch stability. The results can provide technical guidance for the upsizing of ship lifters.

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Gudmundsson, Snorri. « Longitudinal Stability and Control ». Dans General Aviation Aircraft Design, 925–73. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-818465-3.00024-0.

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Gottfredson, Michael, et Travis Hirschi. « Stability Matters ». Dans Modern Control Theory and the Limits of Criminal Justice, 75–92. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190069797.003.0004.

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With regard to crime, stability does not imply once a crook always a crook, that levels of crime or problem behaviors remain at the same rate over time and do not fluctuate, or that crime is caused only by variation in self control. It does mean that some characteristic or characteristics of the person cause crime rate differences over large periods of time. This chapter reviews and critiques developmental criminology and longitudinal studies of crime causation. It provides a critical evaluation of the use of the concept of stability in research about crime and on how prior record and early childhood effects have been misspecified in criminology. In addition, it critically evaluates the turning points, transition, and desistence research. Critiques of tests of the self-control concept in developmental and life-course research are presented. The role of individual differences in sociological theories of crime and delinquency and common problems with inferences from longitudinal data are discussed.

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« Longitudinal and Lateral Linear Stability and Control ». Dans Flight Dynamics, Simulation, and Control, 210–89. CRC Press, 2014. http://dx.doi.org/10.1201/b17346-10.

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Actes de conférences sur le sujet "Longitudinal Stability Control"

Tahir, Naveed, et Adnan Maqsood. « Effect of Active Flow Control on Longitudinal Stability Characteristics ». Dans AIAA SCITECH 2023 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-0994.

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Alesova, Irina M. « Optimum control of one-dimensional structures with longitudinal periodic excitation ». Dans 2018 14th International Conference "Stability and Oscillations of Nonlinear Control Systems" (Pyatnitskiy's Conference) (STAB). IEEE, 2018. http://dx.doi.org/10.1109/stab.2018.8408338.

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Mudford, Neil, et Russell Boyce. « Longitudinal Stability and Control of a Mach 10 "scramjet" glider ». Dans AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-3408.

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Rogers, Robert. « Longitudinal Dynamics and Stability of Hang-Gliders with Pilot Control Reaction ». Dans AIAA Atmospheric Flight Mechanics Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-6307.

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Attia, R., R. Orjuela et M. Basset. « Coupled longitudinal and lateral control strategy improving lateral stability for autonomous vehicle ». Dans 2012 American Control Conference - ACC 2012. IEEE, 2012. http://dx.doi.org/10.1109/acc.2012.6315130.

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Leffler, Heinz. « Consideration of Lateral and Longitudinal Vehicle Stability by Function Enhanced Brake and Stability Control System ». Dans International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1994. http://dx.doi.org/10.4271/940832.

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Ma Weixin. « The features of stability in longitudinal power system and strategy ». Dans 3rd International Conference on Advances in Power System Control, Operation and Management (APSCOM 95). IEE, 1995. http://dx.doi.org/10.1049/cp:19951226.

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Taha, Haitham E. « A Geometric Control Approach for the Longitudinal Flight Stability of Hovering Insects/FWMAVs ». Dans AIAA Guidance, Navigation, and Control Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-1552.

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Lustosa, Leandro R., Francois Defay et Jean-Marc Moschetta. « Longitudinal study of a tilt-body vehicle : Modeling, control and stability analysis ». Dans 2015 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE, 2015. http://dx.doi.org/10.1109/icuas.2015.7152366.

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Sill, Justin, et Beshah Ayalew. « Cascaded Predictive Control of Tire Force Saturation Levels for Vehicle Stability ». Dans ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34661.

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This paper proposes and demonstrates a cascaded predictive control strategy that quantifies and uses longitudinal and lateral tire force saturation for directional stability control of road vehicles. Saturation is explicitly defined and computed as the deficiency of a tire to generate a linearly increasing force in either the lateral or longitudinal direction. The optimal management of lateral saturation levels is set as the objective for an upper level controller, while the optimal management of longitudinal saturation among all tires is set as the objective for a lower level driving/braking torque distribution controller. This cascaded predictive scheme exploits prevailing time scale separations between the lateral vehicle dynamics and the tire/wheel dynamics. The performance of the approach is illustrated using simulations of a medium-duty truck undergoing a transient handling maneuver.

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Rapports d'organisations sur le sujet "Longitudinal Stability Control"

Event-Triggered Adaptive Robust Control for Lateral Stability of Steer-by-Wire Vehicles with Abrupt Nonlinear Faults. SAE International, juillet 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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