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.
Facing the shortcomings of fuzzy set in fuzzy time series, a new data fuzzification method is presented by a kind of new fuzzy sets based on distance sense. Then, the reduction algorithm of fuzzy rules is given by the characteristic expansion method. Finally, through the forecasting of Alabama university enrollments, the results show that the proposed method is effective.
Geometric rectification problems of the strapdown scene matching for aircraft with attitude variances are investigated. Firstly, by analyzing the main factors causing geometric distortion in the process of real-time image capturing, two coordinates system are established, the real-time image distortion is classified, and the distortion mathematic models are proposed. Then, according to the altitude...
As for parameters fluctuating, uncertainties caused by external disturbance and friction, the nonlinearity of the flight simulator turntable servo system, a discrete model reference sliding mode control theme combining with adaptive method and decoupled disturbance compensator is presented, and the globally asymptotically stability of the system is proved. The simulation results verified that the...
In this paper, a method for calibrating and compensating the errors of magnetometer is proposed, in which the error sources consist of constant bias, scale factors, nonorthogonality, hard iron effects and soft iron effects. Related estimation algorithms were proposed, calibration procedure was presented. Two dimensional and three dimensional cases are considered, the efficiency of the proposed algorithms...
In this paper, a four-dimension genetic regulatory network model with two time delays is considered. Firstly, the existence of Hopf bifurcation is considered. Then, by using the normal form method and center manifold theory, the explicit formulas are derived to determine the direction of the Hopf bifurcation and the stability of the bifurcating periodic solutions. Finally, one numerical example is...
This paper presents a robust adaptive fault estimation design method to solve the problem of actuator fault estimation for CCBII Braking System with disturbances and model uncertainties. The proposed robust adaptive fault estimator which is based on an adaptive observer can improve the speed of fault estimation. By transforming the system model into a special coordinate basis (SCB) form, we can structure...
In this paper, the fault detection and isolation problems (FDI) of heavy-haul trains equipped with electronically controlled pneumatic (ECP) brake system are studied. A longitudinal dynamical model and the fault modes of trains are considered. A fault detection estimator bases on the nonlinear observer is designed to generate residual for detecting fault. After the fault is detected, a group of fault...
A hybrid isolated microgrid is proposed, including PV power, diesel generator system, load and other subsystems.. Based the equivalent circuit and output characteristics of photovoltaic cells, PV model has been established and maximum power point tracking(MPPT) has been implemented to make full use of solar energy. Diesel model has been established, base on it PID load frequency compensation control...
In order to determine whether the groundwater seepage has an impact on the ground heat exchanger in thermal efficiency, a three-dimensional coupling thermal seepage model of the vertical u-tube ground heat exchanger was established. The standard κ-ε turbulence model was used inside the pipe and the porous media model was used outside the pipe. The heat transfer process was simulated by the FLUENT...
The model of pressure swing adsorption separation process for CO2 with zeolite molecular sieve is established in this paper. The pressure swing adsorption system of CO2 is simulated with mass, gas and energy balance equations. The CO2 adsorption isotherm is fitted by Dual-site Langmuir equation. The recovery rate, productive rate and energy of the separation process is designed. Finally, the model...
Based on pressure sensor, a speed estimation method for robotic fish is presented in this paper. Based on property of pressure sensor, the relation model between pressure and speed is fitted by experimental analysis. Using this relation model, the swimming speed of robotic fish can be calculated by pressure. A validation experiment was conducted with a freely swimming robot. The experiment results...
This paper is concerned with the evaluation model of emergency capability evaluation for the ship at sea. The goal of our work is to find the human reasons leading to the poor ship emergency capability, and then improve the team cooperation ability in emergency to avoid the vessel accidents. In this paper, firstly, according to the special attitude of the ship on sailing, the emergency capability...
A session-based admission time ratio (ATR) feedback control mechanism is introduced in order to the control Internet load pressure. An auto-regressive moving average (CARIMA) system is described as the Internet load pressure model. The Model Reference Adaptive Controller (MRAC) based on feedback control and feedforward compensation is designed to adjust ATR, and feedback controller is used to statue...
Multiple time lags can occur very naturally in the study of population dynamics. In this paper, we study two forms of the delay logistic equation with two discrete time delays. For both the models, we identify the condition for the first local Hopf bifurcation. For our analysis, we employ a non-dimensional bifurcation parameter. Using Poincaré normal forms and the center manifold theory, we also conduct...
This paper focuses on an integral sliding mode control (ISMC) algorithm for the fault-tolerant control of linear continuous multi-input systems with non-smooth nonsymmetric actuator dead-zone failure and unmatched disturbances. The dead-zone is first modeled as a combination of a line and a disturbance-like term. And the novelty of the paper lies in that the treatment of the deadzone failure based...
A drum boiler is a multivariable nonlinear system with strong interactions and input constraints. In this paper, a robust control method with feed-forward compensation is applied to design a multivariable PID controller for a benchmark boiler control problem, where the boiler model is proposed in an IFAC Conference and can be used as a benchmark for various control methods. H∞ loop-shaping approach...
The boiling process is a multivariable nonlinear system with strong interactions and input constraints. In this paper, a multivariable PID control with feed-forward compensation is designed for a benchmark boiler control problem, where the boiler model is proposed in an IFAC Conference and can be used as a benchmark for various control methods. The proposed PID controller is obtained as a result of...
Firstly, this paper established an optimization model on laying photovoltaic battery with the optimal horizontal obliquity aiming at maximum radiation intensity and the slope obliquity as the decision variable. Then, proposed an “Embedded Search Algorithm” to solve this model. The algorithm not only has high computation efficiency, but also can according to the requirements of the project to achieve...
This paper considers optimization chemical control in integrated pest management. The impulsive models of the pest management consisting of the spaying pesticides and the pesticide effect of crops are established and analyzed. Making use of the optimal control theory to solve the optimal dosages of the pesticides and the time intervals with spaying pesticides. Thus, given an optimal pest management...
Speeding of E-commerce and Internet nowadays promote development, reform and recombination of logistics industry. More and more professionals focus here and approve concept of 4PL, which is the integrator of logistics industry, owns obvious advantages, and can play a role in today's highly competitive condition. In this paper, a multi-objective and multi-task routing problem of 4PL is considered,...
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.