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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, 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...
This paper addresses a constrained robust output regulation problem for a class of output feedback systems with unknown control direction. The problem is firstly transformed into a constrained stabilization problem by introducing the internal model principle. Then a robust adaptive feedback control law for the system is proposed to solve the constrained stabilization problem by incorporating the techniques...
In this paper, the performance analysis of the model of gradient neural network (or termed G-type model), which was designed originally for solving constant linear equation, is investigated, analyzed and simulated for online solution of Zhang linear equation (ZLE or termed time-varying linear equation). Compared with the constant case, G-type model for online ZLE solving can only approximately approach...
By combining two fast training methods, i.e., the weights-direct-determination (WDD) method and Levenberg-Marquardt method, this paper proposes a novel training algorithm called weights and structure policy (WASP) for the three-layer feedforward neuronet, in addition to the algorithm of weights and structure determination (WASD). Note that the pruning-while-growing and second-pruning techniques are...
In this paper, we study the stability of a one-dimentional Euler-Bernoulli beam coupled with a Kelvin-Voigt damped wave equation, where the wave equation acts as a dynamic boundary feedback controller to exponentially stabilize the Euler-Bernoulli beam. Remarkably, the resolvent of the closed-loop system operator is not compact anymore. By a detailed spectral analysis, we show that the residual spectrum...
Information fusion for nonlinear systems is one of the challenging topics in target tracking recently. Aiming at a kind of multi-sensor target tracking systems with correations between process and measurement noises, we study the design of a decentralized fusion algorithm based on the unscented strong tracking filter with correlated noises (USTF-CN). Firstly, the information form of USTF with correlated...
In this article, we provide a numerical method for the mixed H2/H∞ synthesis minimizing the H2 norm of one transfer function while imposing restriction on H∞ norm of the other transfer function. The mixed H2/H∞ robust controller with degree constraint can be designed by solving the nonlinear equations, where a group-preserving scheme is introduced. Three examples are used to investigate the numerical...
In this paper, we discuss how to synthesize a stabilizably robust controller for a ball and plate system (BPS). In order to reduce the fragility in its robust controller synthesis, a loop-shaping method in terms of a normalized right coprime factor (NRCF) uncertainty description for the BPS is thus employed. In effect, the design of weighting functions for the BPS loop-shaping is a decisive factor...
Military and civil aviation are requiring higher performance for the aircrafts in recent years. The morphing techniques can effectively improve aircraft's performance to meet the customer's multi-mission requirement for the aircraft. To get the optimal aerodynamic performance under different flight conditions, the aircraft must change its aerodynamic configuration adaptive to specific condition. In...
Soft variable structure control (VSC) for generalized systems is concerned in the paper. The structural features of soft VSC with differential equation, and some preliminaries for generalized systems are given. The generalized soft variable structure controller is designed, and the stability of generalized systems with soft VSC is proposed by an equivalent characterization. The concrete algorithm...
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...
Variable universe fuzzy control based on intelligent control technology is proposed in this paper for the hypersonic flight process of nearspace vehicle (NSV) with severe changes of aero-dynamic parameters and susceptibility on the external disturbances. And the contraction-expansion factor of the fuzzy control is given to modify the scale of universe and reduce the computational cost. By adopting...
A direct method is discussed for multistage launch vehicle ascent trajectory optimization. First the optimal control problem is modeled with the performance index as maximum terminal mass. A modified Gauss Pseudospectral method is used to design a rapid optimal algorithm for multistage launch vehicle ascent trajectory. The nonlinear terminal state constraints are converted into linear terminal state...
This paper studies the collaboration-based vehicle routing problem with appointment time window aiming at the pickup and delivery service to airport. After defining the satisfaction degree under appointment time window, a heuristic approach is proposed to find the globally optimal vehicle routing scheme. By modeling the pickup and delivery service to airport with and without collaborations, the corresponding...
In this paper we consider H2-regularity of pullback attractors for the reaction-diffusion equation. Firstly, we show that under the suitable conditions, every family of bounded subsets of L2(Ω) which is invariant for the process U, is in fact bounded in H2(Ω). Then, as a consequence, we obtain that the system has a unique continuous periodic solution which attracts any bounded set exponentially.
Seasonal adjustment plays a significant role in the analysis of current social and economic conditions, particularly in determining the stages of the business cycle at which the economy stands. Nowadays the most popular method for seasonal adjustment in time series forecasting is the X-12-ARIMA algorithm, etc. All of these methods are sophisticated and difficult to understand and not suitable for...
A parametric design problem of the finite time state observers for the linear time-invariant systems is investigated. The design aim of the finite time state observers in linear time-invariant systems is to present the parametric form of the state observers which can estimate the system state in a predefined finite time and the estimation stays bounded during the convergence time interval. Based on...
In this paper a current predictive control strategy for grid side converter was proposed, which is of fixed switching frequency, the sinusoidal output current, and fast dynamic response. Experimental platform based on Infineon XC2785X was built. Experimental results showed that the control strategy is feasible and efficient.
In this paper, we propose two modified conjugate gradient methods, which produce sufficient descent direction at every iteration. The theoretical analysis shows that the algorithms are global convergence under some suitable conditions. The numerical results show that both algorithms are efficient for the given test problems from the Matlab library.
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