In this paper, the constrained control problem of prescribed performance technique is discussed in discrete-time domain for single input-single output dynamical systems. The goal design to maintain tracking error trajectory a predefined convergence zone described by function presence uncertainties. order achieve goal, quasi-sliding-mode with new sliding variable proposed. Additionally, using modified zone, transient response system can be adjusted without producing offset steady state....

An adaptive control algorithm has been implemented on a biomethanation process to maintain propionate concentration, stable variable, at given low value, by steering the dilution rate. It was thereby expected ensure stability of during startup and steady-state running with an acceptable performance. The methane pilot reactor operated in completely mixed, once-through mode computer-controlled 161 days. results yielded real-life validation algorithm, documented performance expected.

It has been shown that the closed-loop transfer function representation of unconstrained model predictive control (MPC) for single input output systems is similar to a two-degree-of-freedom controller, which capable improving tracking performance positioning systems. Conventionally, optimal parameters above-mentioned are result quite complicated MPC tuning. This paper proposes new approach obtain directly instead, where input/output constraints not considered. The method combines...

Recently, pneumatic artificial muscles (PAMs), a lightweight and high-compliant actuator, have been increasingly used in assistive rehabilitation robots. PAM-based applications must overcome two inherent drawbacks. The first is the nonlinearity due to compressibility of air, second hysteresis its geometric construction. Because these drawbacks, it difficult construct not only an accurate mathematical model but also high-performance control scheme. In this paper, discrete-time fractional...

The piezoelectric actuators (PEAs) with many advantages such as sub-nanometers resolution, low power consumption, quick response, high stiffness, etc., have been widely used in micro/nano positioning systems which play a very important role key technologies recently. To achieve precision tracking applications based on PEAs, advanced control techniques are needed to cope the nonlinearity exhibiting between input voltage and output displacement of PEAs. This paper proposes new approach get...

Abstract In this paper, a class of linear infinite‐dimensional systems with discrete and distributed time‐varying delays is studied. New sufficient conditions for the robust H ∞ control mixed in Hilbert spaces have been established. The are given terms solution Riccati differential equation. Furthermore, it proved first time that to problem can be solved by global controllability an appropriate delay‐like system. Copyright © 2010 John Wiley & Sons, Ltd.

This paper proposes a nonlinear control system based on observer to manage the active and reactive power within single-phase-frequency-modulated Dual-Active-Bridge DC/DC converter directly. It is accomplished by employing controller regulate direct quadrature current, i <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> (t) xmlns:xlink="http://www.w3.org/1999/xlink">q</sub> (t), as they are directly proportional two components,...

In this paper, an appropriate control strategy is proposed to handle the nonlinear dynamics ofan active magnetic bearing (AMB). The goal of design drive AMB rotor origin with improved transient response. order achieve task, back stepping technique a barrier Lyapunov function are employed keep tracking error trajectory inside predefined zone avoid possible mechanical contact between and stator. Besides, speed observer also used since information about not always available. stability...

Along with the development of powerful microprocessors and microcontrollers, applications model predictive controller, which requires high computational cost, to fast dynamical systems such as power converters electric drives have become a tendency recently. In this paper, two solutions are offered quickly develop finite set current control for induction motor fed by 3-level H-Bridge cascaded inverter. First, field programmable gate array (FPGA) capability parallel computation is employed...

In this research, the control design of induction motor fed by multilevel cascaded H-bridge inverters is discussed. The goal to improve dynamic response system utilizing receding horizon model predictive for inner current loop. To achieve goal, an optimized voltage vector chosen minimizing a cost function based on error in every sampling period. As result, stator quickly tracks its desired value several cycles. feasibility and effectiveness method verified real-time simulations implemented...

In this paper, we consider tracking control problem of piezo-actuated stage which is composed by a piezoelectric actuator (PEA) and positioning mechanism (PM). This plant can be modeled cascading hysteresis with linear dynamical system. The performance system significantly affected phenomenon PEA. order to improve the performance, modified Bouc-Wen model proposed describe more accurately. Then, inverse used compensate nonlinearity. Finally, predictive (MPC) integral error state variable...

In this paper, high precision motion control of piezo-actuated stage is discussed. order to cope with the nonlinear characteristic piezoelectric actuator (PEA) and get tracking performance, paper proposes a new approach design discrete time sliding mode (DSMC) an ability maintain error in known region described by performance function. The effectiveness proposed method verified experiments. results show that system not only performs well complicated desired trajectories but also robust...

This paper deals with the direction-of-arrival (DOA) estimation problem in three-dimensional (3D) space low signal-to-noise ratio (SNR) environments. The proposed solution utilizes an Isolog-3D antenna advanced signal processing techniques for solving direction finding 3D (DF-3D) problem. Standard DF-3D solutions have been shown to work ineffectively SNR scenarios due large power errors. For this problem, we propose a simple but effective method reducing DOA reduction of errors is obtained...

Piezoelectric actuators (PEAs) have been widely used in micro- and nanopositioning applications due to their fine resolution, rapid responses, large actuating forces. However, a major deficiency of PEAs is that accuracy seriously limited by hysteresis. This paper presents adaptive model predictive control technique for reducing hysteresis based on autoregressive exogenous model. Experimental results show the effectiveness proposed method.

Đặt vấn đề: Gãy thân xương đùi là một chấn thương phổ biến, xuất hiện ở mọi lứa tuổi và có liên quan chặt chẽ đến nguyên nhân cơ chế thương. Hiện nay, đa số các trường hợp gãy được điều trị bằng phương pháp kết bên trong, giúp cố định vững chắc ổ gãy, tạo kiện cho bệnh vận động sớm phục hồi chức năng như trước Phương đóng đinh nội tủy chốt dưới màn tăng sáng đã áp dụng từ nhiều năm quả rất tốt. Mục tiêu: Nghiên cứu đặc điểm lâm sàng cận sàng, đồng thời đánh giá kín trên bàn chỉnh hình tại...

Pneumatic Artificial Muscles (PAMs) exhibit hysteresis, nonlinear, and uncertain characteristics. This makes it difficult to build a highly precise model of PAM. In this study, modified Bouc-Wen is used describe the hysteresis in relationship between internal pressure joint angle PAMs antagonistic configuration. Through an identification method using particle swarm optimization, verified that proposed can approximate behavior PAM based actuator with high accuracy. could lead enhancing...

A disc-type rotor magnetic bearing with 3-pole magnet is considered in the paper. The supported by electro-magnetic forces has potential industrial application especially flywheel energy storage systems. However, coupling phenomenon acting makes balancing control problem system challenging. Based on analysing rotor, mechanism identified, and a coordinate transformation formulated to decouple forces. Thanks transformation, design straightforward for each channel leading simple design. goal of...

This research focuses on improving the performance of single-phase grid-connected DC/AC converters, which is intensively used in PV systems. First, T-type topology offers more voltage level than conventional H-bridge to lower total harmonic distortion (THD) output current. Second, quasi-sliding mode control combination with a lump disturbance compensation for current loop. approach guarantees that quickly tracks its reference few sampling cycles despite existence modeling error. Finally, DC...

In this paper, the discrete-time fractional order integral sliding mode control design for linear uncertain systems is investigated. First, a new method proposed to approximate recursively. Then, based on approximation presented. Finally, fuzzy tuning which adjusts gain and of simultaneously employed improve transient response system. The effectiveness strategy verified by both simulations experiments piezo-actuated positioning

In this research, the zero-voltage switching (ZVS) of GaN FETs-based high frequency three-port half-bridge converter (TPHBC), which is capable interfacing a renewable energy source, an storage and load discussed. To achieve ZVS, plays key role in power loss reduction converters, not only parasitic elements but also dead-time between two switches one arm must be taken into account. This research gives detail analysis about influence on ZVS condition. Based analysis, minimum guarantees safe...

In order to suppress payload oscillation, input shaping technique in combination with traditional PID controller is a popular practical approach. However, its performance easily degraded by disturbance and parameter uncertainty. this paper, for improving the of crane system, ADRC distributed proposed. The used reject while keeping simplicity design as controller, plays role vibration suppression. Simulations show effectiveness proposed