The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
D A Macdonald - One of the best experts on this subject based on the ideXlab platform.
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vortex breakdown in a slowly varying tube impulsively rotated about its axis with Constant Angular Velocity
Physics of Fluids, 2003Co-Authors: D A MacdonaldAbstract:For time t<0 viscous fluid is in slow flow through a long straight axially symmetric tube whose radius, ā(x), varies slowly with axial distance, x. When t=0 the tube is impulsively rotated about its axis with Angular Velocity, Ω, at which Angular speed it is thereafter maintained. When Re=Wa/ν=O(1) and e=Wā02/νL→0, λ=Ωa/W→∞ with Γ=eλ2 finite, MacDonald [Phys. Fluids 12, 3168 (2000)] has shown that during the transition from zero Angular Velocity to solid body rotation the flow in the tube is strikingly different for a diverging and a converging tube, when Γ is sufficiently large. Here, e is the Blasius parameter for slowly varying tubes and ā0 and W denote a reference radius and Velocity, respectively. When the tube is diverging, a bubble of recirculating fluid, centered on the axis can occur. This bubble satisfies the definitions of vortex breakdown. When the tube is converging, a toroid of recirculating fluid can occur adjacent to the wall of the tube. Streamlines for each of these cases have bee...
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Vortex breakdown in a slowly varying tube impulsively rotated about its axis with Constant Angular Velocity
Physics of Fluids, 2003Co-Authors: D A MacdonaldAbstract:For time t
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transient recirculation in a slowly varying tube impulsively rotated about its axis with Constant Angular Velocity
Physics of Fluids, 2000Co-Authors: D A MacdonaldAbstract:For time t<0, viscous fluid is in slow flow through a long straight axially symmetric tube whose radius, ā, varies slowly with axial distance, x. When t=0 the tube is impulsively rotated about its axis with Angular Velocity, Ω, at which Angular speed it is thereafter maintained. During the transition from zero Angular Velocity, when t<0, to solid body rotation, when t→∞, the flow in the tube can briefly exhibit striking physical behavior, markedly different from the flow in the stationary tube. We present a linearization of the Navier–Stokes equations, valid when the Blasius parameter e, which governs the magnitude of the inertial forces, tends to zero and the swirl parameter, λ, which is the ratio of a representative tube wall Velocity, Ωā0, to a representative axial Velocity, tends to infinity, with the product eλ2≡Γ held fixed. An analytic solution suitable for computation and valid for suitably large t is presented and streamlines are plotted for a typical diverging and a typical converging tu...
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Transient recirculation in a slowly varying tube impulsively rotated about its axis with Constant Angular Velocity
Physics of Fluids, 2000Co-Authors: D A MacdonaldAbstract:For time t
T. Matsuzaki - One of the best experts on this subject based on the ideXlab platform.
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SMC - Maneuvering target tracking using Constant Velocity and Constant Angular Velocity model
SMC 2000 Conference Proceedings. 2000 IEEE International Conference on Systems Man and Cybernetics. 'Cybernetics Evolving to Systems Humans Organizati, 2000Co-Authors: T. Matsuzaki, H. Kameda, S. Tsujimichi, K. KosugeAbstract:The paper summarizes a maneuvering target tracking using a tracking filter with Constant Velocity and Constant Angular Velocity model. A Constant Velocity model or a Constant acceleration model is often used as a dynamic model of a tracking filter. If a target turns, these filters can not give full performance due to the disagreement between the real target and these models. In order to solve the problem, we propose a tracking filter using Constant Velocity and Constant Angular Velocity model. This model has few disagreements of the dynamic model. The effectiveness of this scheme is confirmed through computer simulations.
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Maneuvering target tracking using Constant Velocity and Constant Angular Velocity model
Smc 2000 conference proceedings. 2000 ieee international conference on systems man and cybernetics. 'cybernetics evolving to systems humans organizati, 2000Co-Authors: T. Matsuzaki, H. Kameda, S. Tsujimichi, K. KosugeAbstract:The paper summarizes a maneuvering target tracking using a tracking filter with Constant Velocity and Constant Angular Velocity model. A Constant Velocity model or a Constant acceleration model is often used as a dynamic model of a tracking filter. If a target turns, these filters can not give full performance due to the disagreement between the real target and these models. In order to solve the problem, we propose a tracking filter using Constant Velocity and Constant Angular Velocity model. This model has few disagreements of the dynamic model. The effectiveness of this scheme is confirmed through computer simulations.
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Manoeuvring target tracking using Constant Velocity and Constant Angular Velocity model
SICE '99. Proceedings of the 38th SICE Annual Conference. International Session Papers (IEEE Cat. No.99TH8456), 1999Co-Authors: T. Matsuzaki, H. Kameda, S. Tsujimichi, Y. KosuoAbstract:A Constant Velocity model and a Constant acceleration model are often used as a dynamic model of a tracking filter. If a target turns, these filters cannot give full performance due to the disagreement between the real target and these models. To solve the problem, in this paper, we propose the tracking filter using the Constant Velocity and Constant Angular Velocity model. This model has better agreements with actual dynamics. In this paper, the effectiveness has been confirmed through computer simulations.
K. Kosuge - One of the best experts on this subject based on the ideXlab platform.
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SMC - Maneuvering target tracking using Constant Velocity and Constant Angular Velocity model
SMC 2000 Conference Proceedings. 2000 IEEE International Conference on Systems Man and Cybernetics. 'Cybernetics Evolving to Systems Humans Organizati, 2000Co-Authors: T. Matsuzaki, H. Kameda, S. Tsujimichi, K. KosugeAbstract:The paper summarizes a maneuvering target tracking using a tracking filter with Constant Velocity and Constant Angular Velocity model. A Constant Velocity model or a Constant acceleration model is often used as a dynamic model of a tracking filter. If a target turns, these filters can not give full performance due to the disagreement between the real target and these models. In order to solve the problem, we propose a tracking filter using Constant Velocity and Constant Angular Velocity model. This model has few disagreements of the dynamic model. The effectiveness of this scheme is confirmed through computer simulations.
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Maneuvering target tracking using Constant Velocity and Constant Angular Velocity model
Smc 2000 conference proceedings. 2000 ieee international conference on systems man and cybernetics. 'cybernetics evolving to systems humans organizati, 2000Co-Authors: T. Matsuzaki, H. Kameda, S. Tsujimichi, K. KosugeAbstract:The paper summarizes a maneuvering target tracking using a tracking filter with Constant Velocity and Constant Angular Velocity model. A Constant Velocity model or a Constant acceleration model is often used as a dynamic model of a tracking filter. If a target turns, these filters can not give full performance due to the disagreement between the real target and these models. In order to solve the problem, we propose a tracking filter using Constant Velocity and Constant Angular Velocity model. This model has few disagreements of the dynamic model. The effectiveness of this scheme is confirmed through computer simulations.
Jigen Peng - One of the best experts on this subject based on the ideXlab platform.
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AIAI - Constant Angular Velocity Regulation for Visually Guided Terrain Following
IFIP Advances in Information and Communication Technology, 2019Co-Authors: Huatian Wang, Qinbing Fu, Hongxin Wang, Jigen PengAbstract:Insects use visual cues to control their flight behaviours. By estimating the Angular Velocity of the visual stimuli and regulating it to a Constant value, honeybees can perform a terrain following task which keeps the certain height above the undulated ground. For mimicking this behaviour in a bio-plausible computation structure, this paper presents a new Angular Velocity decoding model based on the honeybee’s behavioural experiments. The model consists of three parts, the texture estimation layer for spatial information extraction, the motion detection layer for temporal information extraction and the decoding layer combining information from pervious layers to estimate the Angular Velocity. Compared to previous methods on this field, the proposed model produces responses largely independent of the spatial frequency and contrast in grating experiments. The Angular Velocity based control scheme is proposed to implement the model into a bee simulated by the game engine Unity. The perfect terrain following above patterned ground and successfully flying over irregular textured terrain show its potential for micro unmanned aerial vehicles’ terrain following.
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Constant Angular Velocity regulation for visually guided terrain following
arXiv: Robotics, 2019Co-Authors: Huatian Wang, Qinbing Fu, Hongxin Wang, Jigen PengAbstract:Insects use visual cues to control their flight behaviours. By estimating the Angular Velocity of the visual stimuli and regulating it to a Constant value, honeybees can perform a terrain following task which keeps the certain height above the undulated ground. For mimicking this behaviour in a bio-plausible computation structure, this paper presents a new Angular Velocity decoding model based on the honeybee's behavioural experiments. The model consists of three parts, the texture estimation layer for spatial information extraction, the motion detection layer for temporal information extraction and the decoding layer combining information from pervious layers to estimate the Angular Velocity. Compared to previous methods on this field, the proposed model produces responses largely independent of the spatial frequency and contrast in grating experiments. The Angular Velocity based control scheme is proposed to implement the model into a bee simulated by the game engine Unity. The perfect terrain following above patterned ground and successfully flying over irregular textured terrain show its potential for micro unmanned aerial vehicles' terrain following.
J. Baillieul - One of the best experts on this subject based on the ideXlab platform.
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Stabilizability and stabilization of a rotating body-beam system with torque control
IEEE Transactions on Automatic Control, 1993Co-Authors: C.-z. Xu, J. BaillieulAbstract:The stabilizability and stabilization of a rotating body-beam system with torque control are discussed. This system has a linear inertial manifold. An operator-theoretic argument is used to provide an alternative proof of this fact. By taking into account the effect of damping (structural or viscous), the stability result of J. Baillieul and M. Levi (1987) is proved using the LaSalle principle (1968). It is shown that there exists a critical Angular Velocity for the use of torque control to stabilize the system in the neutral configuration with Constant Angular Velocity. For any Constant Angular Velocity smaller than the critical one a feedback torque control law is given which exponentially strongly stabilizes the system in the neutral configuration with the system rotating at the given Constant Angular Velocity.