The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The constant speed control of variable speed pump controlled motor system is discussed in this paper. A dynamic surface controller is chosen to improve robustness of motor speed when rotational speed of variable pump is time-varying. In the presence of bounded parametric uncertainties, an adaptive control scheme with parameter estimation is presented. Load torque used in dynamic surface controller...
Ultra-low speed control strategy is a difficult problem in the single gimbal control moment gyro (SGCMG) gimbal servo system. Speed detection resolution and disturbance torque attenuation are two major factors that restrict further improvements on the ultra-low speed control performance. In this paper, a novel ultra-low speed control strategy is proposed, including a multi-cycle backward difference...
The safe and stable operation of the large capacity thermal power unit must be seriously affected by the rapidly changed load when the unit participates in peak regulation. This paper takes a domestic 600MW steam turbine unit as an example, sets up a mass-spring model with lumped parameter method and calculates the torsional vibration responses of the shafts with the method combined Riccati transfer...
Aiming at the chattering problem of sliding mode control systems for brushless double-fed machines (BDFM), a control strategy named as high order sliding control with chattering avoidance is presented. A feedback linearization technology was adopted for the nonlinear model of BDFM. The results show that compared with traditional sliding mode control, high order sliding control can remove system chattering...
Launch control is a complex issue which requires keeping the engine running, making the launch process of the vehicle smooth and fast. According to the diversity and the uncertainty of launch conditions and the complex control requirements, an active disturbance rejection controller (ADRC) is designed by the speed tracking control. Moreover, a model of the clutch system is given based on the dynamics...
Due to mechanic vibration, multi-frame coupled and gyro random drift and so on, the design and control of the aerial photography stabilized platform is a complicated process. To improve the existing problem of aerial photography stabilized platform, such as the heavy structure, the lacking of adaptability and so on, the small aerial photography stabilized platform is developed. This system consists...
When wave power system using BDFG operated in islanded mode, the unbalanced loads condition should be taken into consideration in the control system, otherwise it will cause active, reactive power and electromagnetic torque fluctuations because of civil electricity. In this paper, the model of BDFG with unbalanced loads is deduced based on symmetrical component theory, the impact of negative sequence...
The full speed range stabilizing control of interior permanent magnet synchronous motor(IPMSM)for electric vehicles based on Port-Controlled Hamiltonian(PCH)theory is proposed in this paper. First, the Hamiltonian stabilizing control of IPMSM is realized using energy-shaping method of interconnection and damping assignment. Then the desired equilibrium is acquired by maximum torque per current(MTPA)...
The gear shift control of 2-speed AMT (Automated Manual Transmission) of pure electric vehicle is investigated to improve the shift quality. During the inertia phase of the gear shift process, a linear-quadratic optimal controller is designed for minimizing the clutch friction work, vehicle jerk and ensuring the transmission output torque change smoothly. The optimal controller is a time-varying linear...
PMSM has been used widely in elevator speed control system. Based on the mathematical model of PMSM and algorithm of inverter (CFPWM, SPWM, SVPWM), PMSM vector control systems are built. By the software of MATLAB/Simulink, the control systems using three inverter methods of CFPWM, SPWM, SVPWM are comparative simulated and analyzed. The results show that the oscillating of torque, speed, and magnetic...
Two classical high frequency voltage injection methods based on saliency-tracking were introduced for initial rotor position identification in permanent magnet synchronous motors (PMSMs): high frequency rotating voltage (HFRV) injection and high frequency pulsating voltage (HFPV) injection. However, the injected voltage resulted in rotor movement, which was not allowed in some high accuracy applications...
Due to the strongly coupled characteristics of permanent magnet synchronous motors(PMSM), the feedback linearization method is presented to decouple the torque current and the flux current in the dynamic state, and control both currents respectively to achieve a quick and precise torque tracking control. Then, the effectiveness of the control method is validated by an effective simulation model of...
This paper focuses on the speed control of the hydraulic secondary regulation system, which has a wide application prospect in hydraulic drive due to its high system efficiency, fast dynamic response and energy recovery capability. To obtain its robust speed control under the conditions of load disturbances and system parameters variations, an active disturbance rejection controller in conjunction...
The vibration suppressive control problem is a challenge of flexible-joint space manipulators, which is settled by solving the energy optimal nonlinear control problem in this paper. Based on Legendre pseudo-spectrum method, the nonlinear model of optimal control problem is converted into the corresponding nonlinear programming problem. The complex and difficult two-point boundary value problem is...
This paper studies the Linear Parameter Varying (LPV) Takagi-Sugeno (T-S) fuzzy gain scheduling control of Wind Turbine Generation System (WTGS) below rated wind speed. The T-S fuzzy linearization approach is used to deal with the Affine Nonlinear Parameter Varying (ANPV) model of WTGS and the LPV T-S fuzzy model with required accuracy is obtained. Considering the maximum utilization of wind energy...
Crane is one of the indispensable tools in the engineering application, and it is one of the multi-axial drag lifting work systems. In this paper, the idea of distributed physical net modeling is adopted to the modeling and simulation of simplified multi-axial drag lifting work system which is based on DC motor, a way of applying in the practical application is put forward. After building a model...
Path optimization for the eddy-current on the surface of conductor is of great importance because the transmission efficiency of the permanent magnetic driver depends on the excitation level generated by the induced current. In this paper we focus on a kind of permanent magnetic driver with notched conductive plate with which the current path is optimized, the current is made to flow radically and...
The Hub-Spoke Tethered Space Robot Formation System is a new Tethered Formation System, which is formed by a master TSR (Tethered Space Robot) and several sub-TSRs. The control problem of the rotating motion of the Hub-Spoke Tethered Space Robot Formation System is presented in this paper, and a coordinated control strategy is proposed to control the errors of the angle between two neighboring sub-TSRs...
This paper designs a MCU-based robot fish with caudal fin in order to model the robot fish and verify the related control methods. Firstly, this paper presents an overall design according to the functions required and then chooses the ideal servo motor after calculating its parameters based on the amplitude and frequency of the sine law. In addition, the controller, the inertial navigation model,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.