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Suspension is one of the important parts of automobile which has a great influence on the comfort of riding, the stability of handling and the control of vehicle's posture. With the simple two degree of freedom of a quarter of the simplified model of automotive suspension, we use the fixed-gain control and the adaptive control to design the controller. Making use of the MATLAB simulation, the scientific...
In this paper, a practical Identification strategy is applied to the optimal design of fractional-order iterative learning control (FOILC). The initialized fractional-order gray-box system with commensurate order or non-commensurate order is identified by using the fractional-order iterative learning Identification and the least square or instrumental variable method. The optimal Dα-type FOILC is...
Based on the characteristic of uncertainty and multi-disturbance of variable-speed of SGIG for wind power generation system, a self-adaptive PID controller was proposed for harvesting the maximum power from wind. Self-adaptive parameters self-turning control and vector control were used via mathematical model of SCIG-wind energy generator system. The controller was designed in Matlab and dSPACE respectively...
According to the random characteristics of external wind speed, time-varying of the internal unit parameters and nonlinearity of wind turbine system, a pitch angle control strategy based on reinforcement learning algorithm for wind turbine is proposed in this paper. The framework of Actor-Critic is adopted in this algorithm and RBF neural network is used to process continuous input and output space...
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...
This note focuses on robust adaptive controller design for Hammerstein systems with symmetric dead-zone nonlinearity and bounded noise. A modified control law is proposed to compensate dead-zone nonlinearity and a new recursive estimator with a nonnegative data weighting is presented to deal with bounded noise. From convergence properties and global stability analysis, we show that parameter estimation...
In this paper the disturbance rejection problem is investigated for a class of linear systems in a new online disturbance-observer-based control framework. The external disturbances are supposed to be cosine harmonic signal with the known frequency. First for the system without disturbances, an output feedback controller is designed via LMI. Based on Fourier transformation algorithm, a modified algorithm...
In this paper, the design of delay-dependent H∞ controller for a class of singular Lurie systems with state-delay is studied. Delay-dependent sufficient condition is obtained in terms of matrix inequalities to ensure the resultant closed-loop system regularity, free of impulses, global uniform asymptotically stable and a prescribed H∞ performance. Furthermore, an LMI based state feedback H∞ control...
The problem of L1-induced performance analysis for continuous positive systems with time-delay is investigated in this paper. At first, we propose a integral method to compute the value of the system L1-induced norm, and the relationship between the transfer function and L1-induced norm of such systems is obtained. Then, the necessary and sufficient condition is given to ensure that such systems are...
In this paper, an improved fractional order proportional integral controller parameter tuning method has been proposed. This method is to map the controller to get a set of vectors in the complex plane. Following the method of vector and geometric in the complex plane, the complicated derivation and calculation can be simplified in the process of the controller design. In addition, the established...
Dynamical systems in the real world are always subject to various disturbances. This paper studies the dynamics of delayed discrete-time linear systems with decaying disturbances. It is first shown that if an unforced linear system is exponentially stable, then the disturbed system has a dynamical property like the exponential stability if the disturbance decays at an exponential rate, and has a dynamical...
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...
In this paper, a suboptimal subcarrier and power allocation algorithm has been developed for the orthogonal frequency division multiplexing(OFDM)-based relay cognitive radio systems. The channel capacity of secondary users is maximized while keeping the total interference introduced to primary user less than a given threshold with a specified power. Compared with the other power allocation algorithm,...
The emergency resources dispatching problem (EMDP) has been addressed in many research papers. few of them take dynamic travel time and how to find key dispatching route into consideration. Based on previous research about the EMDP, in this paper an optimization model is presented, a new model constraint is added which aims to decide the key routes that need to be repaired priority, and the dynamic...
To deal with the problems of topological structure cannot adjust adaptively, easy to trap into the local minimum and diversity losing in traditional particle swarm optimization algorithm, a newly adaptive PSO algorithm based on dynamic link matrix was proposed, which build the neighborhoods though link matrix and divide them into the sub-swarm based on feature clustering. The algorithm can adjust...
The optimal Operation Scheduling for power output of a wind farm with storage units and forecasting system has been studied in this paper. Genetic algorithm(GA) is used to achieve the optimal scheduling of wind farm output power which maximize revenue and minimize costs over a required period. However, the Traditional Genetic Algorithm(TGA) has the characteristics of premature phenomenon and slow...
This paper will establish a reasonable evaluation index system and research method as a solution of main problems. First of all, according to the specific problems on solar house design, evaluation index system is constructed, Then, the idea of integrating the AHP method and the intuitionistic fuzzy entropy method is proposed to determine the weight coefficient of each index; Finally, using the grey...
The design objectives of PID controller is to choose the reasonable parameters which can make the system meet the design requirements. Specific to the problem of the controller parameter optimization of flight control system, the classic tuning method of PID controller parameters is cumbersome and need repeating trial. What's more, the controller parameters cannot be guaranteed to be optimal. Therefore,...
This paper considers the problem of global output feedback control for a class of nonlinear systems with inverse dynamics. The main contribution of paper is that: For the inverse dynamics with uncertain ISS/iISS supply rates, we construct a reduced-order observer-based output feedback controller, which drives the output of system to zero and maintain other closed-loop signals bounded. Finally, a simulation...
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