Fuzzy decoupling predictive functional control for nonlinear hydro-turbine governing systems with mechanical time delay of the hydraulic servo system

This study presents fuzzy decoupling predictive functional control for nonlinear hydro-turbine governing systems with time delay and strong coupling. Here, the Takagi–Sugeno fuzzy approach and fuzzy neural network decoupling algorithm are implemented in the pretreatment of a four-dimensional time delay hydro-turbine governing system model, aiming to solve the nonlinearity and separate coupling variables of the hydro-turbine governing system effectively. Then, a new fuzzy decoupling predictive functional control strategy proposed by combining the simplified hydro-turbine governing system model and predictive function control as well as the robustness and stability of the designed controller are verified by theoretical derivation. Numerical experiment demonstrates effectiveness and superiority of the proposed approach in comparison with fuzzy control under different operation conditions.

Adaptive Predictive Functional Control of X-Y Pedestal for LEO Satellite Tracking Using Laguerre Functions

In this paper, Predictive Functional Control (PFC) is used for X-Y pedestal control for LEO satellite tracking. According to the nonlinear characteristics of the X-Y pedestal and pedestal model variation caused by its operating point change, the use of system identification algorithm, which is based on special types of orthonormal functions known as Laguerre functions, is presented. This algorithm is combined with PFC to obtain a novel adaptive control algorithm entitled Adaptive Predictive Functional Control (APFC). In this combination, Laguerre functions are utilized for system identification, while the PFC is the control law. An interesting feature of the proposed algorithm is its desirable performance against the interference effect of channel X and channel Y. The proposed APFC algorithm is compared with Proportional Integral Derivative (PID) controller using simulation results. The results confirm that the proposed controller improves the performance in terms of the pedestal model variations; that is, the controller is capable of adapting to the model changes desirably.

Pneumatic positioning control system using constrained model predictive controller: Experimental repeatability test

Most of the controllers that were proposed to control the pneumatic positioning system did not consider the limitations or constraints of the system in their algorithms. Non-compliance with the prescribed system constraints may damage the pneumatic components and adversely affect its positioning accuracy, especially when the system is controlled in real-time environment. Model predictive controller (MPC) is one of the predictive controllers that is able to consider the constraint of the system in its algorithm. Therefore, constrained MPC (CMPC) was proposed in this study to improve the accuracy of pneumatic positioning system while considering the constraints of the system. The mathematical model of pneumatic system was determined by system identification technique and the control signal to the valves were considered as the constraints of the pneumatic system when developing the controller. In order to verify the accuracy and reliability of CMPC, repetitive experiments on the CMPC strategy was implemented. The existing predictive controller, that was used to control the pneumatic system such as predictive functional control (PFC), was also compared. The experimental results revealed that CMPC effectively improved the position accuracy of the pneumatic system compared to PFC strategy. However, CMPC not capable to provide a fast response as PFC.

RESEARCH OF PECULIARITIES OF ERROR DETECTION ON THE OUTPUTS OF PROGRAMMABLE LOGIC INTEGRATED CIRCUITS WITH FUNCTIONAL CONTROL BASED ON MODULAR CODES WITH SUMMATION

The article provides examples of the use of programmable logic integrated circuits in various industries. Possible faults in FPGA blocks and their difference from faults in programmable logic arrays are described. Particular attention is paid to the failures of the LUT element. Features of the organization of technical diagnostics systems operating in the operating mode of the objects of diagnostics for combinational logic devices, implemented on the basis of programmable logic integrated circuits are described. Using the example of modular summation codes, it is shown that the known approaches to organizing such systems for devices implemented on a valve basis can be directly applied to devices of the type under consideration. Since malfunctions in the form of errors are recorded, and not the malfunctions themselves, the approaches to the organization of diagnostic systems are universal. It also provides a comparative characteristic of modular sum codes depending on the code module. A code has been proposed that will detect all faults in the example under study.

SYNTHESIS OF FULLY SELF-CHECKED SCHEMES BUILT-IN CONTROL BASED ON POLYNOMIAL CODES FOR COMBINATION LOGIC DEVICES

The article examines the methods of production of functional control systems for logic combinational circuits with full detection of any single faults using the error detection properties of polynomial codes. A classification of special generators of polynomials that form codes with a small value of the control vector length and complete identification of errors of a certain type or multiplicity is presented. A method is presented for constructing a functional control system with complete identification of single faults based on the complete detection of triple errors by polynomial codes. Algorithms for the search and formation of controllable H1-, H2- and H3-groups of circuit outputs, taking into account the properties of polynomial codes, have been developed. The types of functional dependence of the operating outputs for combinational circuits are listed, in which errors of various types can occur. Based on the detection of any symmetric and asymmetric errors by polynomial codes, a method is presented for the constructionof functional control systems with full identification of these type of errors. For an approximate scheme, the development of a functional control system based on the proposed methods is given as:-

Enhancement in pneumatic positioning system using nonlinear gain constrained model predictive controller: experimental validation

The issues of inaccurate positioning control have made an industrial use of pneumatic actuator remains restricted to certain applications only. Non-compliance with system limits and properly control the operating system may also degrade the performance of pneumatic positioning systems. This study proposed a new approach to enhance pneumatic positioning system while considering the constraints of system. Firstly, a mathematical model that represented the pneumatic system was determined by system identification approach. Secondly, model predictive controller (MPC) was developed as a primary controller to control the pneumatic positioning system, which took into account the constraints of the system. Next, to enhance the performance of the overall system, nonlinear gain function was incorporated within the MPC algorithm. Finally, the performances were compared with other control methods such as constrained MPC (CMPC), proportional-integral (PI), and predictive functional control with observer (PFC-O). The validation based on real-time experimental results for 100 mm positioning control revealed that the incorporation of nonlinear gain within the MPC algorithm improved 21.03% and 2.69% of the speed response given by CMPC and PFC-O, and reduced 100% of the overshoot given by CMPC and PI controller; thus, providing fast and accurate pneumatic positioning control system.

Africa and the Eastern Mediterranean After the War

Italy joined the Allies in sending troops to occupy the defeated Ottoman Empire; a detachment went to Constantinople while a larger Expeditionary Force, commanded from the Dodecanese islands, moved into Antalya and the surrounding region where Italy hoped to create a lasting Eastern Mediterranean sphere of influence or even perhaps a League of Nations Mandate. Ultimately, the Treaty of Sèvres was a disappointment, offering no guarantees in Asia Minor; since Italy was both unwilling and unable to fight against Atatürk’s forces to secure its goals in Turkey, it was forced to withdraw altogether by 1923, though it kept hold of the Dodecanese. In Libya, having lost functional control of the interior, Italy had few options but to concede considerable power to Sanussiya brotherhood and others. It also granted local constitutions in 1919, creating a new form of colonial citizenship there. Far from expanding it, the war had left Italy’s empire weakened.