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.
This paper describes Network Enabled Capability (NEC) within Command & Control (C2) systems. In the first part we present the need to transform military operations of Industrial Age to Information Age military operations and the related NCW (Network Centric Warfare). In the next part of the paper we discuss OODA (Observe, Orient, Decide, Act) Loop as a means of optimizing NEC within Command &...
The paper presents a variation of the systems' synthesis problem setting, where it is proposed to use the values of the entropy potentials of the output parameters as an optimization criterion. The use of such criteria makes it possible to improve the quality of the process dynamics assessment, what creates the prerequisites for the control efficiency improvement. With the reference to this specific...
The problems of control applied investment processes under risk conditions are considered. Firstly, theoretical considerations given regarding the formulation and approximate solution of the optimization problem in the presence of finite series of observation of the flow of the process. □ Secondly, we present the results of the computational experiments.
The problem of spatial sensor location under parametric uncertainty of the repetitive distributed-parameter process is discussed. The idea is to reduce the uncertainty of the model used for the design of the iterative learning control, thus increasing the system performance. Particularly, an iterative scheme for estimation of the system parameter distributions is proposed based on the sequential experimental...
During the process of managing a project, requirements and approaches are changed, depending on the project implementation stage or certain challenges that occur during the project implementation. The degree of project's complexity changes over its life cycle phases, where the uncertainty might be considered as highest at the initial phase with the tendency to reduce as information gathers over time...
In this paper, an enhanced form of modified Smith predictor (EMSP) is designed for the control of higher order stable systems. The higher order process, whose controller design is practically difficult, is reduced into first order plus delay (FOPDT) and second order plus delay (SOPDT) and thereby designing controllers capable to control servo and regulatory problems of its original higher order process...
A model-based control design method is developed for nonlinear reactive sputter processes that can be modelled by a nonlinear ordinary differential equation with linear input and stable and unstable equilibrium states. The controller shall robustly stabilize the unstable working points. Lyapunov's direct method is used to formulate stability conditions that respect possible uncertainties in the process...
A new analytical method for a proportional-integral-derivative (PID) controller cascaded with a lead/lag filter based on the basis of the renowned internal model control (IMC) theory is proposed for the first-order plus dead time (FOPDT), the integrator plus dead time (IPDT), and the unstable FOPDT processes. Analytical tuning rules for the PID filter controller are derived in the transparent way...
In this paper, an improved interval type-2 fuzzy logic controller based on genetic algorithm is presented to deal with the problem of losing uncertain information in the type reduction process of interval type-2 fuzzy logic controller. The four uncertain boundary values of interval type-2 fuzzy output are obtained by using interval type-2 fuzzy reasoning and the Wu-Mendel uncertainty bound type reduction...
In this paper, an indirect type iterative learning control (ILC) scheme is proposed for industrial batch processes with input delay, based on using a two-degree-of-freedom control (2DOF) internal model control (IMC) structure. An important merit is that the 2DOF IMC design for robust closed-loop control against process uncertainties and load disturbance is independent of the ILC design specifically...
This paper investigates the periodic disturbance rejection control of time-delay process by integrating a modified disturbance observer (MDOB) and internal model control (IMC) structure. A modified disturbance observer design method based on zero-pole placement is proposed. By the MDOB, periodic disturbance can be accurately estimated and the estimation is used as compensation to suppress disturbance...
In this study flexible job shop scheduling problem (FJSP) with interval processing times is considered and a novel shuffled frog-leaping algorithm (SFLA) is applied to minimize the maximum interval completion time. Memeplexes are constructed only once and no population shuffling is done. The cooperation of global search and neighborhood search are adopted within the search process of each memeplex...
This paper utilizes the quantitative feedback theory (QFT) to design a robust controller for adaptive cutting feedrate control. The proposed algorithm could dynamically change the feedrate according to the spindle current which is highly related to the measured cutting force. The QFT controller could provide the constant cutting force even under different cutting condition. Hence, the machining efficiency...
Exact linearization is often applied to nonlinear processes. This method requires not only the knowledge of the model structure but also the accurate parameter values. If the real parameter values of the controlled process are different from the nominal values used for the exact linearization, the resulting system may not be linear or may have different gains and time constants as expected. A simple...
A sliding mode control (SMC) method based on loop transfer reCovery (LTR) observer is proposed for the equivalent first-order model of pH neutralization process in this paper. The non-singular linear transformations is also used to make delay-free transform for the time-delay process. At the same time, two observers are designed by using LTR method: one is used to observe the system states and the...
Active disturbance rejection control (ADRC) exemplifies the spirit of the data-driven control (DDC) design strategy and shows much promise in obtaining consistent applications in industrial control systems with uncertainties, without the premise that the detailed mathematical model of the controlled system is given. Instead, it is shown that the information needed for the control system to work at...
In this work, an alternative event-based control configuration is presented. The proposal is based on the Internal Model Control (IMC) configuration. As a major difference with existing event-based controllers, the sampling is applied here to the uncertainty estimation signal as it is understood within the IMC scheme. The event generator is therefore based on the combination of a prediction structure...
The welding process is one of the most important application in uncertain sampled-data system. In this paper, the study deals with a fundamental issue of non-fragile control for a class of uncertain sampled-data system. The focus is to design non-fragile controller against possible perturbation by combining pole contraints theory and the linear matrix inequality approach which results in sampled-data...
A large number of real-world problems nowadays require that decisions be made in the presence of uncertainties. Traditionally, the task of separation systems design neglects the influence of uncertainties. This work, however, explores the optimization strategy of a frequently encountered equilibrium-based distillation system design problem in the face of uncertainties. In particular, uncertainties...
In order to solve the problem of position and velocity control of asteroid detectors in the weak gravitational field, a double power sliding mode optimal control method based on radial basis network is proposed in this paper. The dynamic model of the detector in the asteroid fixed coordinate system and the detector landing point coordinate system is analyzed in detail. In the process of the detector...
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.