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Encoded video bitstream is subjected to quality degradation when transmitted over unreliable network. Therefore, a novel feedback-based intra refresh method for robust video coding is proposed in this paper, which takes error concealment's effect, actual loss condition, and the structure of feedback into account. In the decoder, the error correction priority is calculated to reflect the error degree...
This paper firstly introduces the characteristics of hydrodynamic deep drawing (HDD), which is an important sheet metal forming technology, then points out the necessity of the chamber pressure control. Secondly considering the characteristics of the drawing action is repeated, iterative learning control (ILC) is the proper algorithm. Then introduces the concept of iterative learning control and feedback...
In this paper, the absolute stability and feedback control problems of Lur'e singularly perturbed uncertain systems are investigated. An ε-dependent Lyapunov function is constructed. Using the Lyapunov theory and Linear Matrix Inequalities (LMIs) technique, the conditions of absolute stability of the system without disturbances are derived. Then, a method of designing feedback controller is developed...
This paper introduces the multiple source Multiple Destination Robot (MDR-1) having the ability to choose a desired line among multiple lines autonomously. Every line has different colors as their identities. The robot can differentiate among various colors and choose a desired one to find its target. Unlike any other simple line follower robot, this robot can be considered as a true autonomous line...
The stability of uncertain feedback interconnections of causal time-varying linear systems is studied in terms of a recently established generalisation of the υ-gap metric. In particular, a number of robustness results from the well-known linear time-invariant theory are extended. The time-varying generalisations include: sufficient conditions for robust stability; a bound on robust performance; and...
By introducing sliding mode predictive control (SMPC) techniques, a controller with passivity of a class of discrete-time uncertain singular systems is proposed in this paper. A new switching surface function is designed by taking the singular matrix into account, thus the resulting sliding mode dynamics is a full-order uncertain singular time-varying delay system. Due to feedback correction and receding...
Due to the uncertainty of working condition and environment to diesel engine in generator set during the navigation, parameters in the system are uncertain. In order to improve the dynamic accuracy of the speed regulation system for diesel engine in power plant as well as to restrain load turbulence, in this thesis a mathematical model for diesel engine and its speed regulation system is established...
The paper Puts forward a novel feedback chaotic block cipher algorithm based on external key control. The prominent advantage of the algorithm is that the cipherkey of the system is composed of 128-bit external keys. The system parameters, initial conditions and iterations of the chaotic system generate dynamically in line with the ciphertext feedbacks. In this way, the randomness and complexity of...
This paper addresses attitude stabilization of a Rotary-Winged Flying Robot (RWFR) in hover. The main objective is to control the dynamic behavior of RWFR. As the physical nature of RWFR is complex in shape and motion, the simple intuitive mathematical modeling fails as the non-linear aerodynamic forces and gravity acts in a non-intuitive manner. Due to limited accuracy of dynamic model, the RWFR...
In view of the friction nonlinearity and uncertain external disturbance in the bi-axis servo system, on the basis of analyzing the contour error of the system, combined with the cross-coupling control idea, an improved second-order Active Disturbance Rejection Controller (ADRC) was proposed. The inner disturbance and outside disturbance of the system, as well as the friction could be observed and...
Although learning-based control method base on B-Spline Network (BSN) together with PD controller presents an excellent steady-state performance for Uninterruptible Power Supply (UPS) Inverters but it may not achieve high dynamic performance under non-periodic disturbances, which can be inappropriate for high performance UPSs. To further reduce the transient errors, in this paper a simple design and...
Since the Pneumatic Muscle Actuator (PMA) has the characteristic of strong nonlinear and time lags, it is difficult to establish a precise mathematical mode. Model-Free Adaptive Control (MFAC) is an advanced control algorithm that does not require building an off-line mathematical model. This paper is basing on the feature of the PMA and presents a model-free adaptive control algorithm with the nonlinear...
Tracking control of nonlinear uncertain Chua's chaotic systems is studied. Based on coordinate transform, the paper deduced the principle with which Chua's chaotic system can be translated into the so-called general strict-feedback form. Combining the back stepping method with robust control technology, an adaptive parameter control law is developed and thus the output tracking is successfully accomplished...
Tracking control of nonlinear uncertain Chua's chaotic systems is studied. Based on coordinate transform, the paper deduced the principle with which Chua's chaotic system can be translated into the so-called general strict-feedback form. Combining the back stepping method with robust control technology, an adaptive parameter control law is developed and thus the output tracking is successfully accomplished...
This paper investigates the problem of robust integrality for networked control system with norm-bounded parameter uncertainties. Both network-induced delay and data packet dropout are taken into consideration, and data packet dropout is regard as a kind of special delay. A new type of Lyapunov-Krasovakii functional is proposed which contains some triple-integral terms. Based on dynamic output feedback...
This is part of an effort to extend Vinnicombe's v-gap metric based analysis of uncertain feedback interconnections to a linear time-varying setting. The first results involved using integral quadratic constraints (IQCs) to characterise the uncertainty and the existence of v-gap homotopies. Recent work establishes more familiar results in terms of v-gap balls, via the properties of graph symbols and...
In this paper a new intelligent identification method of uncertainty bound utilizes an adaptive neuro-fuzzy inference system (ANFIS) in a feedback scheme is proposed. The proposed ANFIS feedback structure performs better in determining the uncertainty bounds with minimum number of iterations and error. In our proposed technique, the intelligent identified uncertainty weighting function is validated...
In this paper, Quantitative Feedback Theory (QFT) based robust controller for AC-AC buck converter is proposed whose transfer function involves complex load term. The proposed design would give the robust control action against the uncertainty in the parameters of AC-AC buck converter and the desired specifications bound. The proposed design is illustrated using QFT-Terasoft toolbox.
Packet level coding schemes are used to improve the transmission reliability and efficiency in data broadcasting applications, especially for wireless networks. However, existing coding schemes have large redundancy for packets are coded by a random way or some certain probability distributions. Although the Maximum Distance Separable (MDS) codes are designed without redundancy, they are not effective...
This paper investigates the problems of H∞ static output feedback (SOF) control of two-dimensional (2-D) discrete systems described by the Roesser model and Fornasini-Marchesini second model, respectively. By applying the 2-D Bounded Real Lemma combined with a slack variable technique, some sufficient linear matrix inequality (LMI)-based conditions for the existence of SOF controllers are established...
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