Bibliografias temáticas / High speed maneuver

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Literatura científica selecionada sobre o tema "High speed maneuver"

Autor: Grafiati

Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "High speed maneuver"

Li, Hao, Yuping Li, Zhongliang Zhao, Xiaobing Wang, Haiyong Yang e Shang Ma. "High-Speed Virtual Flight Testing Platform for Performance Evaluation of Pitch Maneuvers". Aerospace 10, n.º 11 (15 de novembro de 2023): 962. http://dx.doi.org/10.3390/aerospace10110962.

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To research serious nonlinear coupling problems among aerodynamics, flight mechanics, and flight control during high maneuvers, a virtual flight testing platform has been developed for a large-scale, high-speed wind tunnel, based on the real physical environment, and it can significantly mitigate risks and reduce the costs of subsequent flight tests. The platform of virtual flight testing is composed of three-degrees-of-freedom model support, measuring devices for aerodynamic and motion parameters, a virtual flight control system, and a test model. It provides the ability to realistically simulate real maneuvers, investigate the coupling characteristics of unsteady aerodynamics and nonlinear flight dynamics, evaluate flight performance, and verify the flight control law. The typical test results of a pitch maneuver with open-loop and closed-loop control are presented, including a one-degree-of-freedom pitch motion and a two-degrees-of-freedom pitch and roll motion. The serious pitch and roll-coupled motion during a pitch maneuver at a high angle of attack is revealed, and the flight control law for decoupled control is successfully verified. The comparison of the test results and the flight data of a real pitch maneuver proves the reliability and capability of virtual flight testing.

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Cai, Haohao, e Xiaomei Xu. "Lateral Stability Control of a Tractor-Semitrailer at High Speed". Machines 10, n.º 8 (20 de agosto de 2022): 716. http://dx.doi.org/10.3390/machines10080716.

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To improve the high-speed lateral stability of the tractor-semitrailer, a lateral stability control strategy based on the additional yaw moment caused by differential braking is proposed and investigated based on the co-simulation environment. First of all, a five-degree-of-freedom (5-DOF) yaw-roll dynamic model of the tractor-semitrailer is established, and the model accuracy is verified. Secondly, the lateral stability control strategy of the tractor-semitrailer is proposed, two yaw moment controllers and the braking torque distributor are designed. Then, the effectiveness of the proposed control strategy and the influence of the yaw moment controller on the lateral stability of the tractor-semitrailer are investigated under the high-speed lane-change maneuvers. Finally, the controller robustness is discussed. Research results show that the proposed high-speed lateral stability control strategy can ensure the tractor-semitrailer to perform safely the single lane-change (SLC) maneuver at 110 km/h and the double lane-change (DLC) maneuver at 88 km/h; the yaw moment controller has significant influence on the lateral dynamic performance of the tractor-semitrailer; compared with the proportional-derivative (PD) control, the model predictive control (MPC) can make the tractor-semitrailer obtain better lateral stability under high-speed lane-change maneuvers; MPC and PD controllers exhibit good robustness to the considered vehicle parameter uncertainties.

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Rodriguez, Renato, Yan Wang, Joseph Ozanne, Dogan Sumer, Dimitar Filev e Damoon Soudbakhsh. "Adaptive Takeoff Maneuver Optimization of a Sailing Boat for America’s Cup". Journal of Sailing Technology 7, n.º 01 (17 de outubro de 2022): 88–103. http://dx.doi.org/10.5957/jst/2022.7.4.88.

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This paper presents the development of optimal takeoff maneuvers for an AC75 foiling sailboat competing in the oldest and most prestigious sailboat competition in the world, America’s Cup. The AC75 sailboat presents many challenges to developing these optimal maneuvers due to its nonlinear, high-dimensional, and highly unstable dynamics. During the takeoff maneuver, the boat starts in the water with low speed (displacement mode) and increases its speed until it reaches steady-state foiling (the hull stays out of the water). We optimized the time for the boat’s transitions from displacement mode to foiling mode while maximizing the projection of the velocity in the desired target direction (VMG). We used an adaptive control approach to obtain these optimal maneuvers, which involved using a high-fidelity sailboat simulator for data generation and Jacobian learning for optimization. The optimal solutions were subject to value and rate constraints based on the physical limitations of the actuators, as well as the constraints enforced by human (sailors) abilities to perform such maneuvers. The optimal takeoff maneuver had an average VMG of 7.42 [m s-1], the boat reached the desired takeoff velocity in 14.8 [s] and completed the entire maneuver in 36.4 [s]. The optimal solutions provide insightful information about the dynamic behavior of this complex system and serve as benchmarks for the sailors.

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Kitano, M., K. Watanabe, Y. Takaba e K. Togo. "Lane-change maneuver of high speed tracked vehicles". Journal of Terramechanics 25, n.º 2 (janeiro de 1988): 91–102. http://dx.doi.org/10.1016/0022-4898(88)90017-1.

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Hirano, Masahiro, Akihito Noda, Masatoshi Ishikawa e Yuji Yamakawa. "Networked high-speed vision for evasive maneuver assist". ICT Express 3, n.º 4 (dezembro de 2017): 178–82. http://dx.doi.org/10.1016/j.icte.2017.11.008.

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Quinn, Daniel, Daniel Kress, Eric Chang, Andrea Stein, Michal Wegrzynski e David Lentink. "How lovebirds maneuver through lateral gusts with minimal visual information". Proceedings of the National Academy of Sciences 116, n.º 30 (9 de julho de 2019): 15033–41. http://dx.doi.org/10.1073/pnas.1903422116.

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Flying birds maneuver effectively through lateral gusts, even when gust speeds are as high as flight speeds. What information birds use to sense gusts and how they compensate is largely unknown. We found that lovebirds can maneuver through 45° lateral gusts similarly well in forest-, lake-, and cave-like visual environments. Despite being diurnal and raised in captivity, the birds fly to their goal perch with only a dim point light source as a beacon, showing that they do not need optic flow or a visual horizon to maneuver. To accomplish this feat, lovebirds primarily yaw their bodies into the gust while fixating their head on the goal using neck angles of up to 30°. Our corroborated model for proportional yaw reorientation and speed control shows how lovebirds can compensate for lateral gusts informed by muscle proprioceptive cues from neck twist. The neck muscles not only stabilize the lovebirds’ visual and inertial head orientations by compensating low-frequency body maneuvers, but also attenuate faster 3D wingbeat-induced perturbations. This head stabilization enables the vestibular system to sense the direction of gravity. Apparently, the visual horizon can be replaced by a gravitational horizon to inform the observed horizontal gust compensation maneuvers in the dark. Our scaling analysis shows how this minimal sensorimotor solution scales favorably for bigger birds, offering local wind angle feedback within a wingbeat. The way lovebirds glean wind orientation may thus inform minimal control algorithms that enable aerial robots to maneuver in similar windy and dark environments.

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HARA, Kiyoshi. "Safety of Collision Avoidance Maneuver under High Speed-Navigation". Journal of Japan Institute of Navigation 82 (1990): 69–75. http://dx.doi.org/10.9749/jin.82.69.

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Chen, Wenyu, Weimin Li, Lei Shao e Tao Zhang. "Correction Strategy of Online Midcourse Guidance for High-Speed Gliding Target Interceptor". Applied Sciences 13, n.º 11 (30 de maio de 2023): 6661. http://dx.doi.org/10.3390/app13116661.

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During the interception of a high-speed gliding vehicle (HGV), the predicted intercept point (PIP) is updated many times, so the interceptor must continuously adjust its trajectory. In this paper, we propose an online guidance correction algorithm for the interceptor, which can effectively meet the position constraints and energy management of the guidance process. Firstly, we simplify the interceptor’s maneuvering problem to a two-body orbital transfer problem. The Lambert orbit transfer method is used to enable the interceptor to maneuver towards the target’s PIP. Secondly, by comparing the target’s high probability existence area (THPEA) with the interceptor-interceptable area (IIA), the engine start threshold is set in stages to avoid frequent redundancy maneuvers caused by frequent engine starting during missile correction. This approach achieves energy management. Simulation results show that our midcourse guidance strategy is effective.

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Yasukawa, Hironori, Noritaka Hirata e Yoshiyuki Nakayama. "High-Speed Ship Maneuverability". Journal of Ship Research 60, n.º 04 (1 de dezembro de 2016): 239–58. http://dx.doi.org/10.5957/jsr.2016.60.4.239.

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In this paper, the effects of changes in hull attitude and the presence of stern append- ages such as rudders, shaft brackets, bossing, and propeller shafts on the maneuver- ability of a high-speed ship are investigated. The study is conducted for a ship operating within a Froude number range of 0.6–1.0. To determine the effect of attitude changes on the hydrodynamic derivatives during maneuvering, the hydrodynamic forces acting on the ship model with/without stern appendages are measured in three conditions: an even keel with the designed draft, and the same setup including hull rise or trim. For each condition, measurements are conducted for oblique motion, steady turning, and straight motion with heel, for various ship speeds. The hydro-dynamic derivatives excluding the attitude change are obtained from the measured results, along with the changes in these derivatives due to hull rise and trim. Using the hydrodynamic derivatives, the maneuverability indexes are calculated.

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Yang, Yun Gang, Feng Wang e Zhao Wei Sun. "A Rapid Maneuver Method with High Accuracy for Spacecraft Based on CMG and RW". Advanced Materials Research 591-593 (novembro de 2012): 2395–400. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.2395.

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The mission of ground tracking satellite requires not only the ability of large angle rapid maneuver, but also the ability of attitude stability with high accuracy during and after maneuver. A rapid maneuver method with high accuracy for spacecraft based on CMG and RW is proposed to solve this problem. By use of initial quaternions and target quaternions, a minimum path trajectory tracking algorithm is designed along the instantaneous Euler rotation axis. This algorithm requires that during the accelerating stage and the decelerating stage, the torque command is assigned to CMG system; however, during the constant-speed stage and after maneuver, the torque is assigned to RW system. Mathematical simulation indicates that, compared with the situation of just using CMG, the new method endows the spacecraft with the ability of rapid maneuver with high accuracy.

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Mais fontes

Teses / dissertações sobre o assunto "High speed maneuver"

Penco, Dario. "Contrôle véhicule autonome. Contrôle robuste et haute performance pour permettre les manœuvres à haute dynamique des véhicules autonomes". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG039.

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Le travail abordé dans ces travaux de thèse se place dans le contexte de la conduite autonome. Plus particulièrement, l'objectif est le développement d'une loi de commande pour le suivi de trajectoire d'un véhicule autonome pour des manœuvres d'évitement d'obstacles à haute dynamique.Plusieurs modèles non-linéaires de dynamique du véhicule, capables de représenter son comportement dans des manœuvres à haute dynamique, sont proposés. Le but de la modélisation est d'obtenir un modèle pour la synthèse des correcteurs. L'ensemble de modèles proposés considère les dynamiques des vitesses longitudinale, latérale et de lacet du véhicule, en vue de la synthèse des correcteurs abordant simultanément le contrôle longitudinale et latérale du véhicule. De plus, un modèle non-linéaire des forces des pneus et une représentation variable du transfert de charge ont été utilisés, très importants pour des manouvres à haute dynamique. Des simulations permettent de comparer les différents modèles entre eux et de choisir le plus approprié pour la synthèse du correcteur.Un modèle linéaire variable dans le temps est formulé grâce à une linéarisation le long d'une trajectoire de référence du modèle non-linéaire choisi. En utilisant les approches LPV polytopique et grid-based, ce modèle linéarisé est utilisé pour la définition de deux modèles LPV.Les deux modèles LPV sont donc utilisés pour la synthèse de plusieurs correcteurs, statiques et dynamiques, qui combinent le braquage et le couple aux roues pour stabiliser le véhicule et garantir le suivi de trajectoire sur un ensemble varié de manœuvres d'évitement d'obstacles. La synthèse des correcteurs est effectuée en utilisant la commande robuste et optimale multi-objectif, au moyen de la résolution de problèmes d'optimisation sous contraintes LMI. La prise en compte des saturations des signaux de commande et des forces des pneus permet de maximiser la taille de la région d'attraction du système en boucle fermée pendant la synthèse des correcteurs.Des simulations exploitant un modèle du véhicule à haute représentativité permettent d'analyser la performance du système en boucle fermée en cas des conditions initiales différentes de zéro et de dispersions paramétriques
The work proposed in this thesis is in the context of autonomous driving. In particular, the objective is the development of a control law for path tracking of collision avoidance maneuvers for an autonomous vehicle.Several non-linear models of the vehicle, capable of representing its behavior in high dynamics maneuvers, are presented. The purpose is to obtain a model for the synthesis of the controllers. The different vehicle models proposed take into consideration the dynamics of the longitudinal, lateral and yaw vehicle speeds. That allows to use the models for the synthesis of controllers that deals simultaneously with vehicle longitudinal and lateral control. Moreover, a non-linear model for tire forces and the variable representation for load transfer have been used for the vehicle models. In fact, the representation of the non-linear behavior of the tires, influenced by the load transfer, is critical in high dynamics maneuvers. Some simulation results allow to compare the different vehicle models and to choose the model used for the controllers synthesis.A linear time-variant model is obtained through the linearization of the chosen non-linear model. The LPV polytopic and grid-based approaches are then used to define two LPV models.Several controllers, static and dynamic, have been developed using the two LPV models. These controllers combine the wheels steering ang torques to stabilize the vehicle and to guarantee the vehicle path tracking on a set of collision avoidance maneuvers. The synthesis of the controllers is done using robust and optimal control methods, through the resolution of optimization problems subjected to LMI constraints. The saturations of the control signals and of the tire forces are taken into consideration in the control synthesis in order to maximize the region of attraction of the system in closed loop.Several simulation results, obtained using a high representativity simulation model, allow to asses the closed loop system performances in presence of non-zero initial conditions and parameter dispersions

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Capítulos de livros sobre o assunto "High speed maneuver"

Hui, Xiangyang, Fenghua Chi, Zheng Qi, Meng Wu e Fei Li. "High-Speed Reentry Vehicle Trajectory Optimization and Guidance with Lateral Maneuver". In Lecture Notes in Electrical Engineering, 4151–66. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8155-7_346.

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Florence, Pete, John Carter e Russ Tedrake. "Integrated Perception and Control at High Speed: Evaluating Collision Avoidance Maneuvers Without Maps". In Springer Proceedings in Advanced Robotics, 304–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43089-4_20.

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Maisser, P., e U. Jungnickel. "Stability of Controlled Motion of a Gymnast in High-Speed Mid Air Maneuvers". In IUTAM Symposium on Recent Developments in Non-linear Oscillations of Mechanical Systems, 121–29. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4150-5_13.

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Cushman, Stephen. "The Merit of Philip H. Sheridan’s Memoir Campaign". In The Generals' Civil War, 135–60. University of North Carolina Press, 2021. http://dx.doi.org/10.5149/northcarolina/9781469666020.003.0006.

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Hoping to capitalize on the success of Grant’s memoir, Mark Twain approached Philip H. Sheridan to ask him to write his memoir as well. But by 1888, the Civil War memory market was becoming saturated with generals’ books, and Twain’s assistant at Charles L. Webster and Company warned that sales of Sheridan’s book would never equal those of Grant’s, despite Sheridan’s wide popularity at the time. Nevertheless, Sheridan wrote an excellent memoir in which he created a persona who was frank about his shortcomings, among them his tendency toward insubordination, and about his strengths, among them his ability to inspire soldiers under his command. In his accounts of his Shenandoah Valley Campaign of 1864 and his part in the final Appomattox Campaign of April 1865, Sheridan’s narrative invites discussion of the role of contingency and moral luck in his successful career. Drawing on the thinking of philosopher Thomas Nagel, the discussion considers the relation between Sheridan’s brand of high-speed maneuver warfare and his moral luck.

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"Scott and Tabibi phase into the other by feeding it into the vicinity of the mixing/dispersing element. In this way, the phase being added is quickly dispersed into the continuous phase. Although it is widely accepted that the higher the shear rate produced by the mixer the smaller the droplets and, hence, the more stable the emulsion, there is a major prob-lem that must be avoided if good results are to be obtained with high-speed mixing equipment. Every effort should be made to avoid incorporating air into the mix. Air forms a third phase that could ruin emulsion stability in a number of ways. Air usu-ally reduces the viscosity. The addition steps should be organized such that the impel-ler of the mixture is always submerged deeply enough to avoid surface turbulence or splashing. The arrangement of the mixer angle and/or baffles should avoid vortexing. Another alternative is to perform all of the emulsion-making steps in a vacuum-pro-cessing vessel. An additional method is to premix the components at low speeds and shear rates and then subsequently execute the high-shear portion of the process with in-line equipment in the absence of air. In short, aeration should be avoided. Sometimes the direct approach is not the most effective one. When one phase is first added to another, the small amount of liquid being added forms the internal phase. If more of this liquid is added there comes a point where the continuous phase loses its ability to hold all of the internal phase and the emulsion inverts to the opposite type, e.g., from O/W to W/O. Since it has been found that this practice (phase inversion) can yield small droplet sizes, this method is widely used in batch processing. To ex-ecute this maneuver, one needs to begin mixing with only a small amount of liquid in a batch that will later increase to usually more than four times the starting volume. Therefore, the mixer has to extend well to the bottom of the vessel. One way to avoid this small volume of starting liquid is by using an in-line mixer in a recirculation loop attached to the main mixing vessel as illustrated in Fig. 5. The initial phase is recirculated through the in-line high mixer and the phase to be inverted is then carefully metered directly into the recirculation line. This avoids Fig. 5 In-line mixer in recirculation loop to kettle." In Pharmaceutical Dosage Forms, 326–33. CRC Press, 1998. http://dx.doi.org/10.1201/9781420000955-37.

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Trabalhos de conferências sobre o assunto "High speed maneuver"

JONSSON, H. "High-speed Offensive Missile Evasive maneuver". In Astrodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-2039.

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Irwanto, Herma Yudhi. "Increase maneuver performance of high speed UAV". In 2017 International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM). IEEE, 2017. http://dx.doi.org/10.1109/issimm.2017.8124253.

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Lawitzky, Andreas, Dirk Wollherr e Martin Buss. "Maneuver-based risk assessment for high-speed automotive scenarios". In 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2012). IEEE, 2012. http://dx.doi.org/10.1109/iros.2012.6385825.

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Bumbaugh, James, John Tritschler, Christopher Mattei, Michael Mosher e Robert Barthelmes. "Flight Test Evaluation of Proposed High-Speed Break Turn MTE". In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14594.

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The present work provides the results and findings from continuing research investigations into the high-speed mission task elements (MTEs) for Future Vertical Lift configurations. This study focuses solely on the recently proposed break turn MTE, an aggressive heading change performed at high forward speeds. All prior development and testing of this MTE had been performed in simulators with advanced rotorcraft configurations. The goal of the present study was to conduct a limited-scope flight test assessment of the break turn MTE. The MTE was flown with two helicopters (the UH-72A and UH-60L) and one fixed-wing airplane (the T-6B) to demonstrate how the MTE and its performance criteria applied to aircraft of varying performance and operational limitations. In the design and conduct of the test, a build-up/build-down philosophy of testing was applied to ensure that aircraft limitations were approached deliberately. Additionally, the maneuver conditions were modified in the present study to ensure that the MTE was an assessment of handling qualities alone, i.e., not aircraft performance. The study demonstrated that the break turn MTE is a suitable maneuver to evaluate high speed handling qualities for rotorcraft with the appropriate performance considerations, and the maneuver course layout provided adequate cueing to the pilots.

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Li, Jingliang, Yang Zhang, Jingang Yi e Zhaodu Liu. "Understanding Agile-Maneuver Driving Strategies Using Coupled Longitudinal/Lateral Vehicle Dynamics". In ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-6152.

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Agile maneuvers performed by professional racing car drivers have shown superior travel time and agility. These agile unstable yet safe maneuvers can be potentially used for active safety feature for high-speed obstacle avoidance or other emergency driving. Understanding the driving strategies during these agile maneuvers is however still not clear. In this paper, we first present coupled longitudinal/lateral vehicle dynamics and stability. Based on the stability analysis, we discuss agile maneuver driving strategies under which the vehicle is operated outside the stability region while still maintaining the safety. A new concept of safety boundary is used to quantitatively capture the safe region in the state space of vehicle dynamics. We use pendulum-turn agile maneuver experiments and CarSim simulations as an example to illustrate the analysis. We demonstrate that driving strategies are not unique to achieve high agile maneuvers such as pendulum-turn maneuvers.

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Lucet, E., Ch Grand, D. Salle e Ph Bidaud. "Stabilization Algorithm for a High Speed Car-Like Robot Achieving Steering Maneuver". In 2008 IEEE International Conference on Robotics and Automation. The Half-Day Workshop on: Towards Autonomous Agriculture of Tomorrow. IEEE, 2008. http://dx.doi.org/10.1109/robot.2008.4543595.

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Steinbock, Nathaniel, Laura Prange e Brian C. Fabien. "Active Torque Vectoring in High Speed Lane Change Maneuvers". In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65539.

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Emergency lane changes are often the best course of action when avoiding obstacles on the road, but this maneuver has the possibility of sending the vehicle out of control. The University of Washington EcoCAR team has a hybrid-electric vehicle outfitted with an electric drivetrain and variable torque control to each of the rear wheels. Each rear wheel has an electric motor that is independently controlled to provide torque to the wheel. A lateral vehicle dynamics model is used to develop a torque control strategy to improve the safety and maneuverability of a modified hybrid-electric 2016 Camaro as part of the EcoCAR 3 competition. The specific scenario simulated is a two-lane lane change at a speed of 55 mph. We would like to increase the yaw and lateral accelerations that the vehicle can perform safely by controlling differing torques out of the two motors. Regulating these accelerations requires a control strategy over the left and right motor torques. Equal-torque control of the electric motors will be used as a baseline.

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Oh, Kyeung Heub, Jin Kwon Hwang e Chul Ki Song. "Fuzzy Estimation of Vehicle Speed". In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84029.

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The absolute longitudinal speed of a vehicle is estimated by using data from an accelerometer of the vehicle and wheel speed sensors of a standard 50-tooth antilock braking system. An intuitive solution to this problem is, “When wheel slip is low, calculate the vehicle velocity from the wheel speeds; when wheel slip is high, calculate the vehicle speed by integrating signal of the accelerometer.” The speed estimator weighted with fuzzy logic is introduced to implement the above concept, which is formulated as an estimation method. And the method is improved through experiments by how to calculate speed from acceleration signal and slip ratios. It is verified experimentally to usefulness o estimation speed of a vehicle. And the experimental result shows that the estimated vehicle longitudinal speed has only a 6 % worst-case error during a hard braking maneuver lasting a few seconds.

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Huang, Adam, e Eui-Hyeok Yang. "MEMS Thruster System for CubeSat Orbital Maneuver Applications". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12675.

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This paper reviews the previously developed attitude control micro-thruster propulsion unit (The Aerospace Corporation) and a high pressure piezoelectric microvalve (Jet Propulsion Laboratory), and follows up with a conceptual development effort that is currently underway to optimize the benefits of merging these two technologies. The goal is to provide orbital maneuver capabilities for future Air Force and NASA nano/pico-satellite missions, such as inspector satellites for post launch diagnostics, sparse array antennas, field measurements of space weather events, and the calibration of atmospheric drag in the thermosphere. The piezoelectric microvalve developed is capable of low power (3mW), high speed (>1kHz), and high pressure (70 bar absolute). The target warm gas Newton level propulsion system dry mass is 200 grams and with a volume of <100 cm3 and the intended first mission is to provide CubeSats the ability to operate at orbits of choice rather than opportunity.

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Catania, Giuseppe, Luca Leonelli e Nicolò Mancinelli. "A Multibody Motorcycle Model for the Analysis and Prediction of Chatter Vibrations". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62903.

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The chatter phenomenon, appearing during high speed cornering maneuvers performed by racing motorcycles, consists of a self-excited vertical oscillation of both the front and rear unsprung masses in the range of frequency between 17 and 22 Hz. The suspensions are not generally able to dampen the above vibrations which start from the rear wheel and suddenly propagate to the front wheel during the corner entry phase, making the vehicle’s handling unpredictable and, ultimately, weakening the overall performance, that is the lap time. It is not clear which is the determining factor causing this phenomenon. Therefore, numerical simulation on a three dimensional, multibody motorcycle model is proposed, taking into account the effects of the major parameters involved, in order to highlight which of them takes part in the vibration. Accurate models for tire and drivetrain have been developed, making it possible to consider tire carcass deformability, chain transmission in both traction and braking states, full drivetrain inertia and anti-hop clutch effect. A critical maneuver experimentally measured on the race track is analyzed. The modal response of the linearized system is evaluated for several configurations extracted from the maneuver. The above maneuver is then simulated with the model, showing the actual vibration uprising. A critical discussion of the possible physical interpretations of the phenomenon is given.

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Relatórios de organizações sobre o assunto "High speed maneuver"

Buck, Nicole L., Barry A. Coutermarsh e Sally A. Shoop. Loose-Surface Tire-Terrain Interaction During High-Speed Maneuvers. Fort Belvoir, VA: Defense Technical Information Center, novembro de 2010. http://dx.doi.org/10.21236/ada533233.

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Volunteer Kinematics and Reaction in Lateral Emergency Maneuver Tests. SAE International, novembro de 2013. http://dx.doi.org/10.4271/2013-22-0013.

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It is important to understand human kinematics and muscle activation patterns in emergency maneuvers for the design of safety systems and for the further development of human models. The objective of this study was to quantify kinematic behavior and muscle activation in simulated steering tests in several realistic conditions. In total 108 tests were performed with 10 volunteers undergoing purely lateral maneuvers at 5 m/s2 deceleration or simulated lane change maneuvers at 5 m/s2 peak acceleration and peak yaw velocity of 25 °/s. Test subjects were seated on a rigid seat and restrained by a 4-point belt with retractor. Driver subjects were instructed to be relaxed or braced and to hold the steering wheel while passenger subjects were instructed to put their hands on their thighs. Subjects were instrumented with photo markers that were tracked with 3D high-speed stereo cameras and with electromyography (EMG) electrodes on 8 muscles. Corridors of head displacement, pitch and roll and displacement of T1, shoulder, elbow, hand and knee were created representing mean response and standard deviation of all subjects. In lane change tests for the passenger configuration significant differences were observed in mean peak of head left lateral displacement between the relaxed and the braced volunteers, i.e. 171 mm (σ=58, n=21) versus 121 mm (σ=46, n=17), respectively. Sitting in a relaxed position led to significantly lower muscle activity of the neck muscles. It was concluded that significantly more upper body motion and lower muscle activity was observed for relaxed subjects than for braced subjects.

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