The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Zhaohua Yang - One of the best experts on this subject based on the ideXlab platform.

  • An anti-saturation steering law for Three Dimensional Magnetically Suspended Wheel cluster with angle constraint
    Acta Astronautica, 2018
    Co-Authors: Rui Zhang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract Three Dimensional Magnetically Suspended Wheel (3-DMSW) is a new kind of inertia actuator for spacecraft attitude control, which can provide a 3 degrees of freedom torque. On account of the constraint characteristics of 3-DMSW such as a small Deflection saturation angle of rotor Shaft and the saturation of rotor's variable rotational speed, an anti-saturation steering law based on weighted pseudo inverse is proposed for 3-DMSW cluster. A new weight adjustment method is proposed to adjust the weights of Shaft Deflections dynamically. A specially designed exponential function with current Deflection angle and angular velocity information on the exponent position is adopted as the evaluation criterion of current torque output ability of Shaft Deflection. Thus the torque command can be distributed dynamically with no angle saturation. The weight adjustment method is demonstrated theoretically and the effectiveness of the anti-saturation steering law is validated by conducting several numerical simulations of attitude agile maneuver. Comparing with the 3-DMSW cluster and flywheel cluster using the traditional steering law, the results show that the 3-DMSW cluster using the proposed method makes the process of agile maneuver more rapid and accurate and the saturation angles of 3-DMSW cluster will not be reached.

  • a modified adaptive backstepping method for Shaft Deflection tracking control of magnetically suspended momentum wheel with nonlinear magnetic torque
    Journal of The Franklin Institute-engineering and Applied Mathematics, 2018
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract A modified adaptive backstepping tracking method is proposed to improve the tracking performance of the magnetic bearing system with nonlinear magnetic toque. For a magnetically suspended momentum wheel, two dimensional gyroscopic torque can be produced when the rotor Shaft is actively deflected by the active magnetic bearing. High precision rapid tracking control of Shaft Deflection is desiderated to provide high precision and wide bandwidth outputting torque. The nonlinearity of magnetic bearing is analyzed initially, and the stiffness coefficients of magnetic bearing can be treated as bounded continuous functions with respect to Deflection angles. A fuzzy function based adaptive law is proposed to estimate the stiffness coefficients. Combining with a modified backstepping method, the proposed control strategy can deal with the nonlinearity efficiently when the Shaft deflects rapidly, and its stability is proved by Lyapunov stability theory. To validate the effectiveness of this method, numerous simulations are performed and the results indicate that this method improves the tracking precision when tracking high frequency reference Deflection angles.

  • a non saturated sliding mode control of Shaft Deflection for magnetically suspended momentum wheel with coupled disturbance and saturated amplifier
    Acta Astronautica, 2017
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract The magnetically suspended momentum wheel (MSMW) expands its fresh functions through deflecting the rotary Shaft. An improved nonsingular terminal sliding-mode control (NTSMC) method is proposed to achieve high precision tracking of Shaft Deflection for the MSMW under coupled disturbance and saturated amplifier. A novel structure designed for this MSMW is introduced initially. Its magnetic torque model and coupled disturbance are analyzed, and a tracking error dynamic model is established. Then a NTSMC method is applied to Shaft tracking control. As the saturation of amplifier influences tracking performances, an improved NTSMC is designed to deal with saturation problem. Finally, several simulations are performed to validate the effectiveness of the proposed method. The results indicate the proposed method improves the tracking precision and velocity compared with the conventional integral sliding-mode method, and solves the saturation problem compared with existing NTSMC method.

  • active vibration control of magnetically suspended wheel using active Shaft Deflection
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Yuanjin Yu, Zhaohua Yang
    Abstract:

    A novel method is proposed to actively attenuate the synchronous vibration of a magnetically suspended wheel (MSW) on the basis of Shaft Deflection. Considering the nonparallelism of the rotary axis and the inertial axis of the rotor, a precise dynamic model of the MSW is established as a linear model with synchronous disturbances. To reduce the synchronous vibration torques transferred to the base, the rotor Shaft is actively deflected. A reference Deflection angle is scheduled according to the synchronous disturbances, and a new tracking error dynamic model is established. Then, a composite control method is designed by combining a state feedback method and a disturbance observer. The stabilities of the disturbance observer and the closed-loop system are proven by Lyapunov's stability theorem. The parameters of the disturbance observer and the state feedback controller can be obtained by solving several linear matrix inequalities. The feasibility of vibration reduction due to the proposed method is analyzed. Finally, numerical simulations and experiments are performed. The results indicate that the proposed method significantly reduces the synchronous vibration torques of the MSW.

Yuanjin Yu - One of the best experts on this subject based on the ideXlab platform.

  • An anti-saturation steering law for Three Dimensional Magnetically Suspended Wheel cluster with angle constraint
    Acta Astronautica, 2018
    Co-Authors: Rui Zhang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract Three Dimensional Magnetically Suspended Wheel (3-DMSW) is a new kind of inertia actuator for spacecraft attitude control, which can provide a 3 degrees of freedom torque. On account of the constraint characteristics of 3-DMSW such as a small Deflection saturation angle of rotor Shaft and the saturation of rotor's variable rotational speed, an anti-saturation steering law based on weighted pseudo inverse is proposed for 3-DMSW cluster. A new weight adjustment method is proposed to adjust the weights of Shaft Deflections dynamically. A specially designed exponential function with current Deflection angle and angular velocity information on the exponent position is adopted as the evaluation criterion of current torque output ability of Shaft Deflection. Thus the torque command can be distributed dynamically with no angle saturation. The weight adjustment method is demonstrated theoretically and the effectiveness of the anti-saturation steering law is validated by conducting several numerical simulations of attitude agile maneuver. Comparing with the 3-DMSW cluster and flywheel cluster using the traditional steering law, the results show that the 3-DMSW cluster using the proposed method makes the process of agile maneuver more rapid and accurate and the saturation angles of 3-DMSW cluster will not be reached.

  • a modified adaptive backstepping method for Shaft Deflection tracking control of magnetically suspended momentum wheel with nonlinear magnetic torque
    Journal of The Franklin Institute-engineering and Applied Mathematics, 2018
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract A modified adaptive backstepping tracking method is proposed to improve the tracking performance of the magnetic bearing system with nonlinear magnetic toque. For a magnetically suspended momentum wheel, two dimensional gyroscopic torque can be produced when the rotor Shaft is actively deflected by the active magnetic bearing. High precision rapid tracking control of Shaft Deflection is desiderated to provide high precision and wide bandwidth outputting torque. The nonlinearity of magnetic bearing is analyzed initially, and the stiffness coefficients of magnetic bearing can be treated as bounded continuous functions with respect to Deflection angles. A fuzzy function based adaptive law is proposed to estimate the stiffness coefficients. Combining with a modified backstepping method, the proposed control strategy can deal with the nonlinearity efficiently when the Shaft deflects rapidly, and its stability is proved by Lyapunov stability theory. To validate the effectiveness of this method, numerous simulations are performed and the results indicate that this method improves the tracking precision when tracking high frequency reference Deflection angles.

  • a non saturated sliding mode control of Shaft Deflection for magnetically suspended momentum wheel with coupled disturbance and saturated amplifier
    Acta Astronautica, 2017
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract The magnetically suspended momentum wheel (MSMW) expands its fresh functions through deflecting the rotary Shaft. An improved nonsingular terminal sliding-mode control (NTSMC) method is proposed to achieve high precision tracking of Shaft Deflection for the MSMW under coupled disturbance and saturated amplifier. A novel structure designed for this MSMW is introduced initially. Its magnetic torque model and coupled disturbance are analyzed, and a tracking error dynamic model is established. Then a NTSMC method is applied to Shaft tracking control. As the saturation of amplifier influences tracking performances, an improved NTSMC is designed to deal with saturation problem. Finally, several simulations are performed to validate the effectiveness of the proposed method. The results indicate the proposed method improves the tracking precision and velocity compared with the conventional integral sliding-mode method, and solves the saturation problem compared with existing NTSMC method.

  • active vibration control of magnetically suspended wheel using active Shaft Deflection
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Yuanjin Yu, Zhaohua Yang
    Abstract:

    A novel method is proposed to actively attenuate the synchronous vibration of a magnetically suspended wheel (MSW) on the basis of Shaft Deflection. Considering the nonparallelism of the rotary axis and the inertial axis of the rotor, a precise dynamic model of the MSW is established as a linear model with synchronous disturbances. To reduce the synchronous vibration torques transferred to the base, the rotor Shaft is actively deflected. A reference Deflection angle is scheduled according to the synchronous disturbances, and a new tracking error dynamic model is established. Then, a composite control method is designed by combining a state feedback method and a disturbance observer. The stabilities of the disturbance observer and the closed-loop system are proven by Lyapunov's stability theorem. The parameters of the disturbance observer and the state feedback controller can be obtained by solving several linear matrix inequalities. The feasibility of vibration reduction due to the proposed method is analyzed. Finally, numerical simulations and experiments are performed. The results indicate that the proposed method significantly reduces the synchronous vibration torques of the MSW.

Xinwei Wang - One of the best experts on this subject based on the ideXlab platform.

  • a modified adaptive backstepping method for Shaft Deflection tracking control of magnetically suspended momentum wheel with nonlinear magnetic torque
    Journal of The Franklin Institute-engineering and Applied Mathematics, 2018
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract A modified adaptive backstepping tracking method is proposed to improve the tracking performance of the magnetic bearing system with nonlinear magnetic toque. For a magnetically suspended momentum wheel, two dimensional gyroscopic torque can be produced when the rotor Shaft is actively deflected by the active magnetic bearing. High precision rapid tracking control of Shaft Deflection is desiderated to provide high precision and wide bandwidth outputting torque. The nonlinearity of magnetic bearing is analyzed initially, and the stiffness coefficients of magnetic bearing can be treated as bounded continuous functions with respect to Deflection angles. A fuzzy function based adaptive law is proposed to estimate the stiffness coefficients. Combining with a modified backstepping method, the proposed control strategy can deal with the nonlinearity efficiently when the Shaft deflects rapidly, and its stability is proved by Lyapunov stability theory. To validate the effectiveness of this method, numerous simulations are performed and the results indicate that this method improves the tracking precision when tracking high frequency reference Deflection angles.

  • a non saturated sliding mode control of Shaft Deflection for magnetically suspended momentum wheel with coupled disturbance and saturated amplifier
    Acta Astronautica, 2017
    Co-Authors: Xinwei Wang, Yuanjin Yu, Zhaohua Yang
    Abstract:

    Abstract The magnetically suspended momentum wheel (MSMW) expands its fresh functions through deflecting the rotary Shaft. An improved nonsingular terminal sliding-mode control (NTSMC) method is proposed to achieve high precision tracking of Shaft Deflection for the MSMW under coupled disturbance and saturated amplifier. A novel structure designed for this MSMW is introduced initially. Its magnetic torque model and coupled disturbance are analyzed, and a tracking error dynamic model is established. Then a NTSMC method is applied to Shaft tracking control. As the saturation of amplifier influences tracking performances, an improved NTSMC is designed to deal with saturation problem. Finally, several simulations are performed to validate the effectiveness of the proposed method. The results indicate the proposed method improves the tracking precision and velocity compared with the conventional integral sliding-mode method, and solves the saturation problem compared with existing NTSMC method.

Eiji Toma - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of rotor Shaft shrink fit method for motor using “Robust design”
    Journal of Industrial Engineering International, 2018
    Co-Authors: Eiji Toma
    Abstract:

    This research is collaborative investigation with the general-purpose motor manufacturer. To review construction method in production process, we applied the parameter design method of quality engineering and tried to approach the optimization of construction method. Conventionally, press-fitting method has been adopted in process of fitting rotor core and Shaft which is main component of motor, but quality defects such as core Shaft Deflection occurred at the time of press fitting. In this research, as a result of optimization design of “shrink fitting method by high-frequency induction heating” devised as a new construction method, its construction method was feasible, and it was possible to extract the optimum processing condition.

  • Optimization of Shrink Fitting Process of Rotor Shaft for Motor Applying High Frequency Induction Heating
    Journal of the Institute of Industrial Applications Engineers, 2017
    Co-Authors: Eiji Toma
    Abstract:

    This research is collaborative investigation with the general-purpose motor manufacturer. In order to review construction method in production process, we applied the parameter design method of quality engineering and tried to approach the optimization of construction method. Conventionally, press fitting method has been adopted in process of fitting rotor core and Shaft which is main component of motor, but quality defects such as core Shaft Deflection occurred at the time of press fitting. In this research, as a result of optimization design of "shrink fitting method by high frequency induction heating" devised as a new construction method, its construction method was feasible, and it was possible to extract the optimum processing condition.

Vaclav Pistěk - One of the best experts on this subject based on the ideXlab platform.

  • truck vibrations caused by rotating Shaft Deflection
    Journal of Vibroengineering, 2017
    Co-Authors: Pavel Kucera, Vaclav Pistěk
    Abstract:

    The article deals with the creation of a transient computational model of rotating Shaft Deflection. This model is used for analysis of vibrations in the truck powertrain with an 8×8 drive. This vehicle is intended for military or fire purposes. However, issues with powertrain vibrations after reaching a certain vehicle speed appear. It was assumed that it was caused by the revolutions of the powertrain Shaft and its Deflection. Therefore, the aim is to reduce the vibrations affecting the drive comfort and prepare a computational model of the Shaft. The transient computational model was created in Matlab software and compared with the results of a second model with the use of the finite element method. The second computational model works as a control version for the first model. The verification was carried out with the use of measurement of Shaft Deflection and directional vibrations on the powertrain. The conclusion shows the results of the comparison between the old and the new version of powertrain where vibrations were reduced.

  • Truck vibrations caused by unbalanced rotating Shaft
    2016
    Co-Authors: Pavel Kucera, Vaclav Pistěk
    Abstract:

    This article presents an analysis of vibrations in drivetrain of an 8×8 truck caused by an unbalanced rotating drive Shaft. This truck is also used in military and fire sphere. The aim was to reduce the vibrations affecting the drivers, therefore, a transient computational model for analysis of drivetrain Shaft Deflection was created in Matlab software. This model was compared to the simulation of the transient behaviour of a drivetrain Shaft 3D model with the use of FEM. To verify the computational models, measurements of the rotating Shaft Deflection and directional oscillations on the truck driveline were carried out in the original version and then also with the designed modifications of the components. The conclusion presents the interpretation of the results.