The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Mou Chen - One of the best experts on this subject based on the ideXlab platform.
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Unilateral boundary control for a Suspension Cable system of a helicopter with horizontal motion
IET Control Theory & Applications, 2019Co-Authors: Yong Ren, Mou Chen, Jianye LiuAbstract:In this study, the anti-swing control is investigated for a Suspension Cable system of a helicopter subject to external disturbance. First, a disturbance observer is designed to compensate for the effect of the external disturbance in finite time. Next, based on the proposed disturbance observer and the given desired trajectory, a unilateral boundary control law is proposed to eliminate the vibration by using Lyapunov's direct method. Under the designed control scheme, the ultimately boundedness of closed-loop is guaranteed. Moreover, the vibration range and trajectory tracking error will converge to a small neighbourhood of zero by selecting suitable parameters. Simulation results verify the rationality and validity of proposed control scheme.
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Anti-swing control for a Suspension Cable system of a helicopter with Cable swing constraint and unknown dead-zone
Neurocomputing, 2019Co-Authors: Yong Ren, Mou ChenAbstract:Abstract This paper is devoted to investigating the anti-swing control problem for a Suspension Cable system of a helicopter with Cable swing constraint and unknown dead-zone. Barrier Lyapunov function is adopted to guarantee that Cable swing constraint will not be violated and dead-zone problem is considered as a special bounded disturbance to tackle in the processing of adaptive controller design. Under the proposed control law, the uniform ultimately boundedness of closed-loop system is analyzed. Meanwhile, the vibration range will converge to a small neighborhood of zero by choosing suitable design parameters in spite of considering Cable swing constraint and unknown dead-zone. The performances of the designed adaptive boundary control scheme are verified by a numerical simulation.
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Disturbance observer-based boundary control for a Suspension Cable system moving in the horizontal plane:
Transactions of the Institute of Measurement and Control, 2018Co-Authors: Yong Ren, Mou ChenAbstract:This paper addresses the suppressing problem of Cable vibration and the positioning control design for a Suspension Cable system of a helicopter with disturbances. Hamilton’s principle is applied t...
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Antidisturbance Control for a Suspension Cable System of Helicopter Subject to Input Nonlinearities
IEEE Transactions on Systems Man and Cybernetics: Systems, 2018Co-Authors: Mou Chen, Yong Ren, Jianye LiuAbstract:In this paper, the suppressing problem of the Cable’s vibration is studied for a Suspension Cable system of helicopter with disturbances. The Hamilton’s principle is applied to obtain a distributed parameter system of the Suspension Cable system which includes one partial differential equation and two ordinary differential equations. Two nonlinear disturbance observers are developed to compensate the effect of boundary disturbances. The auxiliary systems are designed to eliminate the effects of input nonlinearities. Based on the designed disturbance observer and auxiliary systems, two boundary controllers are designed at the top and bottom boundaries of the Suspension Cable. Under the proposed controllers, the amplitude of oscillation is proven to be uniformly ultimately bounded and converges to a small neighborhood of zero by selecting proper design parameters of the antidisturbance control scheme for the Suspension Cable system. Meanwhile, some sufficient conditions are provided to guarantee the effectiveness of the developed control law. Finally, simulation results show that the controllers developed in this paper work well in handling disturbances for the Suspension Cable system of helicopter.
Yong Ren - One of the best experts on this subject based on the ideXlab platform.
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Unilateral boundary control for a Suspension Cable system of a helicopter with horizontal motion
IET Control Theory & Applications, 2019Co-Authors: Yong Ren, Mou Chen, Jianye LiuAbstract:In this study, the anti-swing control is investigated for a Suspension Cable system of a helicopter subject to external disturbance. First, a disturbance observer is designed to compensate for the effect of the external disturbance in finite time. Next, based on the proposed disturbance observer and the given desired trajectory, a unilateral boundary control law is proposed to eliminate the vibration by using Lyapunov's direct method. Under the designed control scheme, the ultimately boundedness of closed-loop is guaranteed. Moreover, the vibration range and trajectory tracking error will converge to a small neighbourhood of zero by selecting suitable parameters. Simulation results verify the rationality and validity of proposed control scheme.
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Boundary Control for a Suspension Cable System of a Helicopter With Saturation Nonlinearity Using Backstepping Approach
IEEE Access, 2019Co-Authors: Yong Ren, Zhi-bao SongAbstract:In this paper, the problems of vibration reduction and trajectory tracking are investigated for a Suspension Cable system of a helicopter in the presence of input saturation and external disturbances. First, an auxiliary system is proposed to compensate for the error between control input and actuator output which is caused by input saturation. Then, based on the introduced auxiliary system, an adaptive boundary control scheme is proposed to track a desired trajectory and restrain the vibration by using backstepping method. Under the designed control scheme, the uniform ultimate boundedness of closed-loop system is guaranteed. Moreover, the vibration amplitude and the trajectory tracking error will be guaranteed to converge ultimately to a small neighborhood of zero by selecting suitable parameters. The rationality and validity of designed control law is verified by a numerical simulation.
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Anti-swing control for a Suspension Cable system of a helicopter with Cable swing constraint and unknown dead-zone
Neurocomputing, 2019Co-Authors: Yong Ren, Mou ChenAbstract:Abstract This paper is devoted to investigating the anti-swing control problem for a Suspension Cable system of a helicopter with Cable swing constraint and unknown dead-zone. Barrier Lyapunov function is adopted to guarantee that Cable swing constraint will not be violated and dead-zone problem is considered as a special bounded disturbance to tackle in the processing of adaptive controller design. Under the proposed control law, the uniform ultimately boundedness of closed-loop system is analyzed. Meanwhile, the vibration range will converge to a small neighborhood of zero by choosing suitable design parameters in spite of considering Cable swing constraint and unknown dead-zone. The performances of the designed adaptive boundary control scheme are verified by a numerical simulation.
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Disturbance observer-based boundary control for a Suspension Cable system moving in the horizontal plane:
Transactions of the Institute of Measurement and Control, 2018Co-Authors: Yong Ren, Mou ChenAbstract:This paper addresses the suppressing problem of Cable vibration and the positioning control design for a Suspension Cable system of a helicopter with disturbances. Hamilton’s principle is applied t...
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Antidisturbance Control for a Suspension Cable System of Helicopter Subject to Input Nonlinearities
IEEE Transactions on Systems Man and Cybernetics: Systems, 2018Co-Authors: Mou Chen, Yong Ren, Jianye LiuAbstract:In this paper, the suppressing problem of the Cable’s vibration is studied for a Suspension Cable system of helicopter with disturbances. The Hamilton’s principle is applied to obtain a distributed parameter system of the Suspension Cable system which includes one partial differential equation and two ordinary differential equations. Two nonlinear disturbance observers are developed to compensate the effect of boundary disturbances. The auxiliary systems are designed to eliminate the effects of input nonlinearities. Based on the designed disturbance observer and auxiliary systems, two boundary controllers are designed at the top and bottom boundaries of the Suspension Cable. Under the proposed controllers, the amplitude of oscillation is proven to be uniformly ultimately bounded and converges to a small neighborhood of zero by selecting proper design parameters of the antidisturbance control scheme for the Suspension Cable system. Meanwhile, some sufficient conditions are provided to guarantee the effectiveness of the developed control law. Finally, simulation results show that the controllers developed in this paper work well in handling disturbances for the Suspension Cable system of helicopter.
Jianye Liu - One of the best experts on this subject based on the ideXlab platform.
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Unilateral boundary control for a Suspension Cable system of a helicopter with horizontal motion
IET Control Theory & Applications, 2019Co-Authors: Yong Ren, Mou Chen, Jianye LiuAbstract:In this study, the anti-swing control is investigated for a Suspension Cable system of a helicopter subject to external disturbance. First, a disturbance observer is designed to compensate for the effect of the external disturbance in finite time. Next, based on the proposed disturbance observer and the given desired trajectory, a unilateral boundary control law is proposed to eliminate the vibration by using Lyapunov's direct method. Under the designed control scheme, the ultimately boundedness of closed-loop is guaranteed. Moreover, the vibration range and trajectory tracking error will converge to a small neighbourhood of zero by selecting suitable parameters. Simulation results verify the rationality and validity of proposed control scheme.
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Antidisturbance Control for a Suspension Cable System of Helicopter Subject to Input Nonlinearities
IEEE Transactions on Systems Man and Cybernetics: Systems, 2018Co-Authors: Mou Chen, Yong Ren, Jianye LiuAbstract:In this paper, the suppressing problem of the Cable’s vibration is studied for a Suspension Cable system of helicopter with disturbances. The Hamilton’s principle is applied to obtain a distributed parameter system of the Suspension Cable system which includes one partial differential equation and two ordinary differential equations. Two nonlinear disturbance observers are developed to compensate the effect of boundary disturbances. The auxiliary systems are designed to eliminate the effects of input nonlinearities. Based on the designed disturbance observer and auxiliary systems, two boundary controllers are designed at the top and bottom boundaries of the Suspension Cable. Under the proposed controllers, the amplitude of oscillation is proven to be uniformly ultimately bounded and converges to a small neighborhood of zero by selecting proper design parameters of the antidisturbance control scheme for the Suspension Cable system. Meanwhile, some sufficient conditions are provided to guarantee the effectiveness of the developed control law. Finally, simulation results show that the controllers developed in this paper work well in handling disturbances for the Suspension Cable system of helicopter.
Marwan Nader - One of the best experts on this subject based on the ideXlab platform.
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Suspension Cable design of the new san francisco oakland bay bridge
Journal of Bridge Engineering, 2004Co-Authors: John Sun, Rafael Manzanarez, Marwan NaderAbstract:Various factors contribute to the difficulty in designing the main Suspension Cable for the new San Francisco–Oakland Bay Bridge Self-Anchored Suspension Span (or East Bay Bridge Suspension Span). The key factors are bridge design life, Cable geometry, Cable anchorage layout, Cable construction method, and Cable corrosion protection system. This paper describes the unique main Suspension Cable geometry layout for the East Bay Bridge Suspension Span, reviews the available technologies for each of the aforementioned design considerations, and presents the final Cable design recommendations.
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Suspension Cable Design of the New San Francisco–Oakland Bay Bridge
Journal of Bridge Engineering, 2003Co-Authors: John Sun, Rafael Manzanarez, Marwan NaderAbstract:Various factors contribute to the difficulty in designing the main Suspension Cable for the new San Francisco–Oakland Bay Bridge Self-Anchored Suspension Span (or East Bay Bridge Suspension Span). The key factors are bridge design life, Cable geometry, Cable anchorage layout, Cable construction method, and Cable corrosion protection system. This paper describes the unique main Suspension Cable geometry layout for the East Bay Bridge Suspension Span, reviews the available technologies for each of the aforementioned design considerations, and presents the final Cable design recommendations.
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design of looping Cable anchorage system for new san francisco oakland bay bridge main Suspension span
Journal of Bridge Engineering, 2002Co-Authors: John Sun, Rafael Manzanarez, Marwan NaderAbstract:Located at the rocky edge of the Yerba Buena Island, the west anchorage of the San Francisco–Oakland Bay Bridge Suspension span serves as the anchor for this single tower self-anchored Suspension bridge. With extensive comparative studies on numerous alternatives, the new looping Cable anchorage system is recommended for the final design of the west anchorage of the self-anchored Suspension span. The looping Cable anchorage system essentially consists of a prestressed concrete portal frame, a looping anchorage Cable, deviation saddles, a jacking saddle, independent tie-down systems, and gravity reinforced-concrete foundations. This anchorage system is chosen for its structural efficiency and dimensional compactness. This paper describes major design issues, design philosophy, concept development, and key structural elements and details of this innovative Suspension Cable anchorage system.
Algirdas Juozapaitis - One of the best experts on this subject based on the ideXlab platform.
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non linear analysis of Suspension bridges with flexible and rigid Cables
Journal of Civil Engineering and Management, 2010Co-Authors: Algirdas Juozapaitis, Siim Idnurm, Gintaris Kaklauskas, Juha Idnurm, Vikto GribniakAbstract:Abstract One of the main problems related to the design of Suspension bridges is stabilisation of their initial form. The tendency of Suspension bridges to deform is generally determined by the kinematical displacements of the Suspension Cable caused by asymmetrical loads rather than by the elastic deformations. There are some Suspension bridges when the so‐called rigid (stiff in bending) Cables instead of usual flexible Cables are suggested for stabilisation of their initial form. The analysis methods of such Suspension bridges with rigid Cables are underdeveloped. For the analysis of classical Suspension bridges analytical models can be applied. However, in case of concentrated forces, the numerical techniques are preferred. The article presents analytical expressions for the calculation of internal forces and displacements of Suspension bridges with a rigid Cable. The article also discusses the discrete calculation model for classical Suspension bridges.
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Non‐linear analysis of Suspension bridges with flexible and rigid Cables
Journal of Civil Engineering and Management, 2010Co-Authors: Algirdas Juozapaitis, Siim Idnurm, Gintaris Kaklauskas, Juha Idnurm, Vikto GribniakAbstract:Abstract One of the main problems related to the design of Suspension bridges is stabilisation of their initial form. The tendency of Suspension bridges to deform is generally determined by the kinematical displacements of the Suspension Cable caused by asymmetrical loads rather than by the elastic deformations. There are some Suspension bridges when the so‐called rigid (stiff in bending) Cables instead of usual flexible Cables are suggested for stabilisation of their initial form. The analysis methods of such Suspension bridges with rigid Cables are underdeveloped. For the analysis of classical Suspension bridges analytical models can be applied. However, in case of concentrated forces, the numerical techniques are preferred. The article presents analytical expressions for the calculation of internal forces and displacements of Suspension bridges with a rigid Cable. The article also discusses the discrete calculation model for classical Suspension bridges.
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Numerical modeling of Suspension Cable kinematic displacements
2005Co-Authors: Algirdas Juozapaitis, Arnoldas Norkus, Tatjana GrigorjevaAbstract:Modelling of Cable kinematic displacements is performed by FE, proposed by authors analytical and engi-neering methods. The proposed analytical and FE methods results fit sufficiently well, when engineering methods yield significant errors.
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Displacement analysis of asymmetrically loaded Cable
Journal of Civil Engineering and Management, 2004Co-Authors: Algirdas Juozapaitis, Arnoldas NorkusAbstract:Abstract A deformed state of parabolic shape Suspension Cable subjected to asymmetric loading is under consideration. The Cable kinematic nature of vertical and horizontal displacements, resulted from complementary asymmetrically distributed load are investigated, the expressions for their maximum values are derived. The deformability of Suspension Cable versus its curvature increment is investigated. The possibilities to stabilise the primary parabolic shape of Suspension Cable subjected to an asymmetric load are examined. Numerical simulation results are presented.
