The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Tor Anders Johansen - One of the best experts on this subject based on the ideXlab platform.
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A four-quadrant thrust estimation scheme for marine propellers: Theory and experiments
IEEE Transactions on Control Systems Technology, 2009Co-Authors: Luca Pivano, Tor Anders Johansen, Øyvind N. SmogeliAbstract:A thrust estimation scheme for marine propellers that can operate in the full four-quadrant range of the propeller Shaft Speed and the vessel Speed has been developed. The scheme is formed by a nonlinear observer to estimate the propeller torque and the propeller Shaft Speed and by a mapping to compute the thrust from the observer estimates. The mapping includes the estimation of the propeller advance ratio. The advance Speed is assumed to be unknown, and only measurements of Shaft Speed and motor torque have been used. The robustness of the scheme is demonstrated by Lyapunov theory. The proposed method is experimentally tested on an electrically driven fixed pitch propeller in open-water conditions, in waves and with a wake screen that scales the local flow down in order to simulate one of the effects of the interaction between the propeller and the vessel hull.
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Nonlinear thrust controller for marine propellers in four-quadrant operations
Proceedings of the American Control Conference, 2007Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:In this paper a nonlinear thrust controller for a marine propeller in four-quadrant operations is presented. It is a Shaft Speed controller where the desired velocity is computed based on the desired propeller thrust and on the torque losses, estimated with a nonlinear observer. Experimental results are provided to demonstrate the effectiveness of the controller. The proposed scheme shows improved performance in thrust production when compared to traditional Shaft Speed and torque control.
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Preliminary simulation studies of a new four-quadrant propeller thrust controller applied to underwater vehicles
IFAC Proceedings Volumes (IFAC-PapersOnline), 2007Co-Authors: Luca Pivano, Tor Anders Johansen, Louis L. Whitcomb, ThorI I FossenAbstract:In this paper a recently reported four-quadrant nonlinear thrust controller for marine propellers is applied to the velocity control of an underwater vehicle. The controller, designed for fixed pitch electrically driven propellers, is based on a Shaft Speed control and employs an estimate of the propeller torque loss. A simulation study is performed in order to compare the presented approach with the conventional Shaft Speed and torque propeller controllers. Copyright © 2007 IFAC.
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Marine Propeller Thrust Estimation in Four-Quadrant Operations
Proceedings of the 45th IEEE Conference on Decision and Control, 2006Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:This paper proposes a scheme for thrust estimation of a marine propeller over the full four-quadrant range of propeller Shaft Speed and vessel Speed. Based on Shaft Speed and motor torque measurements, the scheme involves a nonlinear observer for the propeller torque that shows stability and robustness for hounded modeling and measurement errors. The propeller thrust is computed as a static function of the propeller torque. The performance has been demonstrated in experimental tests
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Anti-spin control for marine propulsion systems
Proceedings of the IEEE Conference on Decision and Control, 2004Co-Authors: Øyvind N. Smogeli, Jostein Hansen, Asgeir J Sorensen, Tor Anders JohansenAbstract:An anti-spin controller for marine propulsion systems in rough seas is developed. From measurements of motor torque and propeller Shaft Speed, an observer providing an accurate estimate of the propeller load torque is used to calculate an estimate of the torque loss. A monitoring algorithm utilizing the estimated torque loss detects ventilation incidents, and activates the anti-spin control action. When a ventilation situation is detected, the anti-spin control action will reduce the propeller Shaft Speed to some optimal value, using a combined power/torque controller. The ultimate goal is to minimize the effect of ventilation, and hence increase the thrust production, limit the transients in the power system and reduce the mechanical wear and tear of the propulsion system components. Simulations are provided to validate the performance of the control scheme.
Øyvind N. Smogeli - One of the best experts on this subject based on the ideXlab platform.
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A Four-Quadrant Thrust Controller for Marine Propellers with Loss Estimation and Anti-Spin
IFAC Proceedings Volumes, 2016Co-Authors: Luca Pivano, Jostein Bakkeheim, Tor Arne Johansen, Øyvind N. SmogeliAbstract:Abstract In this paper a nonlinear thrust controller for a fixed pitch marine propeller with torque loss estimation and an anti-spin strategy is presented. The controller, designed to work in the four-quadrant plane composed by the Shaft Speed and the vessel Speed, is a combination of a thrust controller designed for calm sea conditions and an anti-spin strategy to reduce power peaks and wear-and-tear in extreme sea conditions. The anti-spin algorithm avoid large increase of the Shaft Speed once high torque losses due to ventilation are detected and set the Shaft Speed to normal when the loss situation is considered over. The ventilation incident is detected by monitoring the torque losses, estimated with a nonlinear observer. The performances of the proposed controller are validated by experiments carried out in a towing tank.
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Torque and power control of electrically driven marine propellers
Control Engineering Practice, 2009Co-Authors: Asgeir J Sorensen, Øyvind N. SmogeliAbstract:In conventional electric propulsion systems with fixed pitch propellers, the low-level thruster controllers are usually aimed at controlling the Shaft Speed only, without fully utilizing the capabilities of the electrical motors to apply other control strategies. In the dynamic operating conditions encountered in waves, this leads to undesired oscillations in thrust, torque, and power. This paper presents a comparison study and analysis of thruster Shaft Speed, torque, and power controllers, and shows that significant reductions in thrust, torque, and power fluctuations can be achieved. Open-water model test experiments validate the analysis and demonstrate the performance of the proposed controllers.
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A four-quadrant thrust estimation scheme for marine propellers: Theory and experiments
IEEE Transactions on Control Systems Technology, 2009Co-Authors: Luca Pivano, Tor Anders Johansen, Øyvind N. SmogeliAbstract:A thrust estimation scheme for marine propellers that can operate in the full four-quadrant range of the propeller Shaft Speed and the vessel Speed has been developed. The scheme is formed by a nonlinear observer to estimate the propeller torque and the propeller Shaft Speed and by a mapping to compute the thrust from the observer estimates. The mapping includes the estimation of the propeller advance ratio. The advance Speed is assumed to be unknown, and only measurements of Shaft Speed and motor torque have been used. The robustness of the scheme is demonstrated by Lyapunov theory. The proposed method is experimentally tested on an electrically driven fixed pitch propeller in open-water conditions, in waves and with a wake screen that scales the local flow down in order to simulate one of the effects of the interaction between the propeller and the vessel hull.
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Torque and power control of electrically driven marine propellers
Control Engineering Practice, 2009Co-Authors: Asgeir J Sorensen, Øyvind N. SmogeliAbstract:In conventional electric propulsion systems with fixed pitch propellers, the low-level thruster controllers are usually aimed at controlling the Shaft Speed only, without fully utilizing the capabilities of the electrical motors to apply other control strategies. In the dynamic operating conditions encountered in waves, this leads to undesired oscillations in thrust, torque, and power. This paper presents a comparison study and analysis of thruster Shaft Speed, torque, and power controllers, and shows that significant reductions in thrust, torque, and power fluctuations can be achieved. Open-water model test experiments validate the analysis and demonstrate the performance of the proposed controllers. © 2009 Elsevier Ltd. All rights reserved.
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Nonlinear thrust controller for marine propellers in four-quadrant operations
Proceedings of the American Control Conference, 2007Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:In this paper a nonlinear thrust controller for a marine propeller in four-quadrant operations is presented. It is a Shaft Speed controller where the desired velocity is computed based on the desired propeller thrust and on the torque losses, estimated with a nonlinear observer. Experimental results are provided to demonstrate the effectiveness of the controller. The proposed scheme shows improved performance in thrust production when compared to traditional Shaft Speed and torque control.
Luca Pivano - One of the best experts on this subject based on the ideXlab platform.
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A Four-Quadrant Thrust Controller for Marine Propellers with Loss Estimation and Anti-Spin
IFAC Proceedings Volumes, 2016Co-Authors: Luca Pivano, Jostein Bakkeheim, Tor Arne Johansen, Øyvind N. SmogeliAbstract:Abstract In this paper a nonlinear thrust controller for a fixed pitch marine propeller with torque loss estimation and an anti-spin strategy is presented. The controller, designed to work in the four-quadrant plane composed by the Shaft Speed and the vessel Speed, is a combination of a thrust controller designed for calm sea conditions and an anti-spin strategy to reduce power peaks and wear-and-tear in extreme sea conditions. The anti-spin algorithm avoid large increase of the Shaft Speed once high torque losses due to ventilation are detected and set the Shaft Speed to normal when the loss situation is considered over. The ventilation incident is detected by monitoring the torque losses, estimated with a nonlinear observer. The performances of the proposed controller are validated by experiments carried out in a towing tank.
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NONLINEAR MODEL IDENTIFICATION OF A MARINE PROPELLER OVER FOUR-QUADRANT OPERATIONS
IFAC Proceedings Volumes, 2016Co-Authors: Luca Pivano, ThorI I Fossen, Tor Arne JohansenAbstract:Abstract This paper proposes a nonlinear dynamics model for a marine propeller able to reproduce the propeller thrust over the full four-quadrant range of propeller Shaft Speed and vessel Speed. A two-state model has been identified from experimental data. The model includes a state equation for the propeller Shaft Speed and one that describes the dynamics of the axial flow velocity. The model reproduces accurately propeller thrust and torque over a wide range of operation.
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A four-quadrant thrust controller for marine propellers with loss estimation and anti-spin : theory and experiments
Marine Technology and Sname News, 2009Co-Authors: Luca Pivano, Tor Arne Johansen, Y³vind N SmogeliAbstract:In this paper a nonlinear thrust controller for fixed pitch marine propellers with torque loss estimation and an antispin strategy is presented. The controller, designed to operate in the four-quadrant plane composed by the Shaft Speed and the vessel Speed, is a combination of a thrust controller developed for calm/moderate sea states and an anti-spin strategy to reduce power peaks and wear-and-tear in extreme sea conditions. The thrust controller aims at producing the demanded thrust independently from the propeller losses. The anti-spin algorithm lowers the Shaft Speed once large torque losses are detected and increases the Shaft Speed to normal when the loss situation is considered over. The torque losses are estimated with a nonlinear observer. The performance of the proposed controller is validated by experiments carried out in a towing tank.
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A four-quadrant thrust estimation scheme for marine propellers: Theory and experiments
IEEE Transactions on Control Systems Technology, 2009Co-Authors: Luca Pivano, Tor Anders Johansen, Øyvind N. SmogeliAbstract:A thrust estimation scheme for marine propellers that can operate in the full four-quadrant range of the propeller Shaft Speed and the vessel Speed has been developed. The scheme is formed by a nonlinear observer to estimate the propeller torque and the propeller Shaft Speed and by a mapping to compute the thrust from the observer estimates. The mapping includes the estimation of the propeller advance ratio. The advance Speed is assumed to be unknown, and only measurements of Shaft Speed and motor torque have been used. The robustness of the scheme is demonstrated by Lyapunov theory. The proposed method is experimentally tested on an electrically driven fixed pitch propeller in open-water conditions, in waves and with a wake screen that scales the local flow down in order to simulate one of the effects of the interaction between the propeller and the vessel hull.
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Nonlinear thrust controller for marine propellers in four-quadrant operations
Proceedings of the American Control Conference, 2007Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:In this paper a nonlinear thrust controller for a marine propeller in four-quadrant operations is presented. It is a Shaft Speed controller where the desired velocity is computed based on the desired propeller thrust and on the torque losses, estimated with a nonlinear observer. Experimental results are provided to demonstrate the effectiveness of the controller. The proposed scheme shows improved performance in thrust production when compared to traditional Shaft Speed and torque control.
ThorI I Fossen - One of the best experts on this subject based on the ideXlab platform.
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NONLINEAR MODEL IDENTIFICATION OF A MARINE PROPELLER OVER FOUR-QUADRANT OPERATIONS
IFAC Proceedings Volumes, 2016Co-Authors: Luca Pivano, ThorI I Fossen, Tor Arne JohansenAbstract:Abstract This paper proposes a nonlinear dynamics model for a marine propeller able to reproduce the propeller thrust over the full four-quadrant range of propeller Shaft Speed and vessel Speed. A two-state model has been identified from experimental data. The model includes a state equation for the propeller Shaft Speed and one that describes the dynamics of the axial flow velocity. The model reproduces accurately propeller thrust and torque over a wide range of operation.
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Preliminary simulation studies of a new four-quadrant propeller thrust controller applied to underwater vehicles
IFAC Proceedings Volumes (IFAC-PapersOnline), 2007Co-Authors: Luca Pivano, Tor Anders Johansen, Louis L. Whitcomb, ThorI I FossenAbstract:In this paper a recently reported four-quadrant nonlinear thrust controller for marine propellers is applied to the velocity control of an underwater vehicle. The controller, designed for fixed pitch electrically driven propellers, is based on a Shaft Speed control and employs an estimate of the propeller torque loss. A simulation study is performed in order to compare the presented approach with the conventional Shaft Speed and torque propeller controllers. Copyright © 2007 IFAC.
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Nonlinear thrust controller for marine propellers in four-quadrant operations
Proceedings of the American Control Conference, 2007Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:In this paper a nonlinear thrust controller for a marine propeller in four-quadrant operations is presented. It is a Shaft Speed controller where the desired velocity is computed based on the desired propeller thrust and on the torque losses, estimated with a nonlinear observer. Experimental results are provided to demonstrate the effectiveness of the controller. The proposed scheme shows improved performance in thrust production when compared to traditional Shaft Speed and torque control.
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CDC - Marine Propeller Thrust Estimation in Four-Quadrant Operations
Proceedings of the 45th IEEE Conference on Decision and Control, 2006Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Arne Johansen, ThorI I FossenAbstract:This paper proposes a scheme for thrust estimation of a marine propeller over the full four-quadrant range of Propeller Shaft Speed and vessel Speed. Based on Shaft Speed and motor torque measurements, the scheme involves a nonlinear observer for the propeller torque that shows stability and robustness for bounded modeling and measurement errors. The propeller thrust is computed as a static function of the propeller torque. The performance has been demonstrated in e perimental tests.
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Marine Propeller Thrust Estimation in Four-Quadrant Operations
Proceedings of the 45th IEEE Conference on Decision and Control, 2006Co-Authors: Luca Pivano, Øyvind N. Smogeli, Tor Anders Johansen, ThorI I FossenAbstract:This paper proposes a scheme for thrust estimation of a marine propeller over the full four-quadrant range of propeller Shaft Speed and vessel Speed. Based on Shaft Speed and motor torque measurements, the scheme involves a nonlinear observer for the propeller torque that shows stability and robustness for hounded modeling and measurement errors. The propeller thrust is computed as a static function of the propeller torque. The performance has been demonstrated in experimental tests
J.d. Aplevich - One of the best experts on this subject based on the ideXlab platform.
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maximum power tracking control for a wind turbine system including a matrix converter
IEEE Transactions on Energy Conversion, 2009Co-Authors: S. Masoud Barakati, Mehrdad Kazerani, J.d. AplevichAbstract:This paper focuses on maximum wind power extraction for a wind energy conversion system composed of a wind turbine, a squirrel-cage induction generator, and a matrix converter (MC). At a given wind velocity, the mechanical power available from a wind turbine is a function of its Shaft Speed. In order to track maximum power, the MC adjusts the induction generator terminal frequency, and thus, the turbine Shaft Speed. The MC also adjusts the reactive power transfer at the grid interface toward voltage regulation or power factor correction. A maximum power point tracking (MPPT) algorithm is included in the control system. Conclusions about the effectiveness of the proposed scheme are supported by analysis and simulation results.
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Maximum Power Tracking Control for a Wind Turbine System Including a Matrix Converter
IEEE Transactions on Energy Conversion, 2009Co-Authors: S. Masoud Barakati, Mehrdad Kazerani, J.d. AplevichAbstract:This paper focuses on maximum wind power extraction for a wind energy conversion system composed of a wind turbine, a squirrel-cage induction generator, and a matrix converter. At a given wind velocity, the mechanical power available from a wind turbine is a function of its Shaft Speed. In order to track maximum power, the matrix converter (MC) adjusts the induction generator terminal frequency, and thus, the turbine Shaft Speed. The MC also adjusts the reactive power transfer at the grid interface towards voltage regulation or power factor correction. A Maximum Power Point Tracking (MPPT) algorithm is included in the control system. Conclusions about the effectiveness of the proposed scheme are supported by analysis and simulation results.
