The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Fred Nitzsche - One of the best experts on this subject based on the ideXlab platform.
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An investigation of in‐field blockage effects in closely spaced Lateral Wind farm configurations
Wind Energy, 2014Co-Authors: S. Mctavish, S. Rodrigue, Daniel Feszty, Fred NitzscheAbstract:A method of increasing the performance of Wind farms has been established by limiting the Lateral separation between neighbouring Wind turbines. The close proximity of the Wind turbines creates a beneficial in-field blockage effect that results in a core of increased speed that is accelerated through the gap between the turbines. A preceding study indicated that the performance of three Wind turbines can be increased by over 10% with tip-to-tip separation of 0.5 diameters (D) compared with the power output of the respective turbines in isolation. A corresponding flow-mapping study has been completed in the current work using a single-normal hot-wire anemometer to characterize the increased flow speed through a narrow Lateral gap, leading to the observation of a region of increased speed that occurs between 0D and 2.5D downstream of the gap between Laterally spaced Wind turbines. The experimental results were confirmed by conducting a series of computational simulations with the generalized unsteady vortex particle discrete vortex method code. The simulations were conducted with three rotors arranged in five different configurations, and the increase in power generated by the multi-rotor configurations closely followed the observed experimental trends. The closely spaced Lateral Wind turbine configurations may have the ability to increase the annual capacity factor of Wind farms while reducing Wind farm land use requirements. Copyright © 2014 John Wiley & Sons, Ltd.
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A study of the performance benefits of closely-spaced Lateral Wind farm configurations
Renewable Energy, 2013Co-Authors: S. Mctavish, Daniel Feszty, Fred NitzscheAbstract:Abstract Scaled Wind turbine experiments were conducted in order to evaluate the beneficial effect of closely-spaced Lateral Wind turbine configurations on the performance of a Wind farm. Two outer Wind turbines were spaced apart with a particular gap distance and the longitudinal setback of a central rotor was varied at each gap width. The turbine placement resulted in tip-to-tip separation distances that ranged from 1 diameter (D) to 0.25D. Additionally, the performance of a Wind farm layout in rough and smooth boundary layers, designed to mimic onshore and offshore conditions, respectively, was evaluated. It was observed that a narrow gap between several Laterally-aligned rotors creates an in-field blockage effect that results in beneficial flow acceleration through the gap. This increase in speed increases the power output of the central turbine when its longitudinal setback is between 0D and 2.5D. A cumulative increase in power output of 17% was observed when 3 rotors were aligned in a Lateral plane with a blade tip separation of 0.5D or 0.25D, compared to the same number of rotors in isolation. While the benefits of closely-spaced Wind turbines were observed in both of the tested boundary layers, the performance benefits with a smooth boundary layer were smaller than with a rough boundary layer. These results may lead to new Wind farm design methodologies for certain topology- and Wind distribution-specific sites and suggest that Wind turbines can be closely-spaced in the Lateral direction in order to obtain substantial increases in power.
S. Mctavish - One of the best experts on this subject based on the ideXlab platform.
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An investigation of in‐field blockage effects in closely spaced Lateral Wind farm configurations
Wind Energy, 2014Co-Authors: S. Mctavish, S. Rodrigue, Daniel Feszty, Fred NitzscheAbstract:A method of increasing the performance of Wind farms has been established by limiting the Lateral separation between neighbouring Wind turbines. The close proximity of the Wind turbines creates a beneficial in-field blockage effect that results in a core of increased speed that is accelerated through the gap between the turbines. A preceding study indicated that the performance of three Wind turbines can be increased by over 10% with tip-to-tip separation of 0.5 diameters (D) compared with the power output of the respective turbines in isolation. A corresponding flow-mapping study has been completed in the current work using a single-normal hot-wire anemometer to characterize the increased flow speed through a narrow Lateral gap, leading to the observation of a region of increased speed that occurs between 0D and 2.5D downstream of the gap between Laterally spaced Wind turbines. The experimental results were confirmed by conducting a series of computational simulations with the generalized unsteady vortex particle discrete vortex method code. The simulations were conducted with three rotors arranged in five different configurations, and the increase in power generated by the multi-rotor configurations closely followed the observed experimental trends. The closely spaced Lateral Wind turbine configurations may have the ability to increase the annual capacity factor of Wind farms while reducing Wind farm land use requirements. Copyright © 2014 John Wiley & Sons, Ltd.
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A study of the performance benefits of closely-spaced Lateral Wind farm configurations
Renewable Energy, 2013Co-Authors: S. Mctavish, Daniel Feszty, Fred NitzscheAbstract:Abstract Scaled Wind turbine experiments were conducted in order to evaluate the beneficial effect of closely-spaced Lateral Wind turbine configurations on the performance of a Wind farm. Two outer Wind turbines were spaced apart with a particular gap distance and the longitudinal setback of a central rotor was varied at each gap width. The turbine placement resulted in tip-to-tip separation distances that ranged from 1 diameter (D) to 0.25D. Additionally, the performance of a Wind farm layout in rough and smooth boundary layers, designed to mimic onshore and offshore conditions, respectively, was evaluated. It was observed that a narrow gap between several Laterally-aligned rotors creates an in-field blockage effect that results in beneficial flow acceleration through the gap. This increase in speed increases the power output of the central turbine when its longitudinal setback is between 0D and 2.5D. A cumulative increase in power output of 17% was observed when 3 rotors were aligned in a Lateral plane with a blade tip separation of 0.5D or 0.25D, compared to the same number of rotors in isolation. While the benefits of closely-spaced Wind turbines were observed in both of the tested boundary layers, the performance benefits with a smooth boundary layer were smaller than with a rough boundary layer. These results may lead to new Wind farm design methodologies for certain topology- and Wind distribution-specific sites and suggest that Wind turbines can be closely-spaced in the Lateral direction in order to obtain substantial increases in power.
Daniel Feszty - One of the best experts on this subject based on the ideXlab platform.
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An investigation of in‐field blockage effects in closely spaced Lateral Wind farm configurations
Wind Energy, 2014Co-Authors: S. Mctavish, S. Rodrigue, Daniel Feszty, Fred NitzscheAbstract:A method of increasing the performance of Wind farms has been established by limiting the Lateral separation between neighbouring Wind turbines. The close proximity of the Wind turbines creates a beneficial in-field blockage effect that results in a core of increased speed that is accelerated through the gap between the turbines. A preceding study indicated that the performance of three Wind turbines can be increased by over 10% with tip-to-tip separation of 0.5 diameters (D) compared with the power output of the respective turbines in isolation. A corresponding flow-mapping study has been completed in the current work using a single-normal hot-wire anemometer to characterize the increased flow speed through a narrow Lateral gap, leading to the observation of a region of increased speed that occurs between 0D and 2.5D downstream of the gap between Laterally spaced Wind turbines. The experimental results were confirmed by conducting a series of computational simulations with the generalized unsteady vortex particle discrete vortex method code. The simulations were conducted with three rotors arranged in five different configurations, and the increase in power generated by the multi-rotor configurations closely followed the observed experimental trends. The closely spaced Lateral Wind turbine configurations may have the ability to increase the annual capacity factor of Wind farms while reducing Wind farm land use requirements. Copyright © 2014 John Wiley & Sons, Ltd.
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A study of the performance benefits of closely-spaced Lateral Wind farm configurations
Renewable Energy, 2013Co-Authors: S. Mctavish, Daniel Feszty, Fred NitzscheAbstract:Abstract Scaled Wind turbine experiments were conducted in order to evaluate the beneficial effect of closely-spaced Lateral Wind turbine configurations on the performance of a Wind farm. Two outer Wind turbines were spaced apart with a particular gap distance and the longitudinal setback of a central rotor was varied at each gap width. The turbine placement resulted in tip-to-tip separation distances that ranged from 1 diameter (D) to 0.25D. Additionally, the performance of a Wind farm layout in rough and smooth boundary layers, designed to mimic onshore and offshore conditions, respectively, was evaluated. It was observed that a narrow gap between several Laterally-aligned rotors creates an in-field blockage effect that results in beneficial flow acceleration through the gap. This increase in speed increases the power output of the central turbine when its longitudinal setback is between 0D and 2.5D. A cumulative increase in power output of 17% was observed when 3 rotors were aligned in a Lateral plane with a blade tip separation of 0.5D or 0.25D, compared to the same number of rotors in isolation. While the benefits of closely-spaced Wind turbines were observed in both of the tested boundary layers, the performance benefits with a smooth boundary layer were smaller than with a rough boundary layer. These results may lead to new Wind farm design methodologies for certain topology- and Wind distribution-specific sites and suggest that Wind turbines can be closely-spaced in the Lateral direction in order to obtain substantial increases in power.
S. Rodrigue - One of the best experts on this subject based on the ideXlab platform.
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An investigation of in‐field blockage effects in closely spaced Lateral Wind farm configurations
Wind Energy, 2014Co-Authors: S. Mctavish, S. Rodrigue, Daniel Feszty, Fred NitzscheAbstract:A method of increasing the performance of Wind farms has been established by limiting the Lateral separation between neighbouring Wind turbines. The close proximity of the Wind turbines creates a beneficial in-field blockage effect that results in a core of increased speed that is accelerated through the gap between the turbines. A preceding study indicated that the performance of three Wind turbines can be increased by over 10% with tip-to-tip separation of 0.5 diameters (D) compared with the power output of the respective turbines in isolation. A corresponding flow-mapping study has been completed in the current work using a single-normal hot-wire anemometer to characterize the increased flow speed through a narrow Lateral gap, leading to the observation of a region of increased speed that occurs between 0D and 2.5D downstream of the gap between Laterally spaced Wind turbines. The experimental results were confirmed by conducting a series of computational simulations with the generalized unsteady vortex particle discrete vortex method code. The simulations were conducted with three rotors arranged in five different configurations, and the increase in power generated by the multi-rotor configurations closely followed the observed experimental trends. The closely spaced Lateral Wind turbine configurations may have the ability to increase the annual capacity factor of Wind farms while reducing Wind farm land use requirements. Copyright © 2014 John Wiley & Sons, Ltd.
S. Di Gennaro - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear adaptive tracking for ground vehicles in the presence of Lateral Wind disturbance and parameter variations
Journal of the Franklin Institute, 2017Co-Authors: C. Acosta Lúa, S. Di GennaroAbstract:Abstract In this paper we design a dynamic controller for the attitude control of a ground vehicle. This controller ensures the tracking of desired references, in the presence of uncertainties in the parameters describing the tire-road friction coefficient and the Lateral tire stiffness, and in the presence of external perturbations, such as Lateral Wind. It incorporates some dynamics reconstructing the Lateral vehicle velocity, often not directly measured. Finally, the proposed control scheme allows the identification of the unknown parameters and, at the same time, of the disturbance due to the Lateral Wind acting on the vehicle. The performance of the dynamic controller is evaluated making use of CarSim considering a challenging double steer maneuver.
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CDC - Nonlinear adaptive tracking for ground vehicles
Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009Co-Authors: G. Burgio, Bernardino Castillo-toledo, S. Di GennaroAbstract:In this paper we design of an adaptive scheme for controlling the attitude of a ground vehicle. This control ensures the tracking of desired references for Lateral and angular references, in presence of uncertainties in the parameters describing the tire-road friction coefficient and the Lateral tire stiffness, and in presence of external perturbation, such as Lateral Wind. The proposed adaptive control scheme allows the identification of the disturbance acting on the vehicle and, at the same time, behaves well also in presence of sudden changes of the friction coefficient, in the case of vehicle parameter variations, and in presence of Wind gusts.
