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This paper proposes a linear state variable feedback (LSVF) control scheme with state estimator as a Power System Stabilizer (PSS). This controller is adopted here because of the fact that it is an output feedback control strategy similar to conventional PSS schemes available in literature. The performance of the proposed controller is evaluated on a single machine infinite bus (SMIB) system under...
In compressed sensing, the l1-constrained minimal singular value (l1-CMSV) of an encoder is used for analyzing (theoretically) the robustness of decoders against noise. In this paper, we show that for random encoders, the square of the l1-CMSV (S-CMSV) is a random variable. And, for the Gaussian encoders, the S-CMSV admits a simple, closed-form probability and a cumulative distribution functions....
Normally, statistical methods are used to generate rankings for genes in terms of their ability to distinguish between normal and malignant tumors from a gene expression dataset. However, different statistical methods yield different ranks for same gene and there is no universally accepted method for ranking. Therefore rank aggregation is required to find the overall ranking of the set of genes. There...
Historically, all engineering systems have been studied, analyzed and implemented by approximating the governing dynamics associated with the system by an Integer Order model. Although these models were able to replicate a close to real time working behavior, an exact model of these systems was always subject matter of research. With the advancement in technology an accurate model understanding of...
Many studies about improving the performance of biped robots, especially energy efficiency and waking speed have been done. These properties, however, are secondary to the robot ability to prevent falling down on irregular grounds. In this paper, we propose a novel method which uses an active up-and-down wobbling mass to improve walking ability and robustness of biped robot on uneven terrain. We will...
Image Forgery is a real time issue in this present era and that causes inimical effects in the society. This is more common due to the availability of numerous image modifications software. The ultimate aim of this project is to provide a best optimal solution to this existing problem. The forgery in images includes object removal, object addition, unusual color modifications. There are many existing...
Nowadays images have been easily reproduced and distributed globally very fast. For the copyright protection, the copy detection is an important issue. Any modification on image copying processes can be viewed as attacks. The attacks include adding some small information as well as modifying images. In addition, the content-based copy detection techniques are relied on the image properties which could...
The robust filtering problem for uncertain discrete-time systems is treated in this paper. An ε-contaminated framework is adopted to design the robust filter in presence of model uncertainties. The result is presented in term of Toeplitz matrix equations. The proposed approach does not require a formal modelling of uncertainties. Meanwhile, the ε-contaminated robust filter is equivalent to the minimum...
Inference of ancestral or extinct genomes is important in evolutionary biology, cancer research and many other research areas. Whole-genome data has become readily available due to advances in large-scale sequencing technology. During the past decades, a number of evolutionary models and related algorithms have been designed to infer ancestral genome sequence or gene order. Since it is so hard or...
The H∞ loop shaping method is known as one of the robust controller design method. In this method, the design procedure consists of two steps; weight design and derivation of stabilizing controller. The controller is designed to suppress the H∞ norm of the transfer matrix consisting of a sensitivity function, a complementary sensitivity function, etc. As a result, the closed-loop system achieves good...
Helicopter flight control law design including rotor state feedback is considered and an approach based on structured H∞ control, capable of guaranteeing stability and performance robustness, is proposed. The framework also encompasses fault tolerance with respect to failures of the rotor state sensors. Simulation results comparing the proposed approach to results from the literature are presented...
In this paper, the Continuous Motion (CM) NCTF controller is proposed for a point-to-point (PTP) positioning system of a one mass rotary system. For this system, the CM-NCTF controller is designed based on the conventional structure of NCTF controller and improved. The CM-NCTF controller consists of Nominal Characteristic Trajectory (NCT) and Proportional Integral (PI) compensator. It is designed...
Energy-maximising controllers for wave energy devices are normally based on linear hydrodynamic device models. Such models ignore nonlinear effects which typically manifest themselves for large device motion (typical in this application) and may also include other modelling errors. In this paper, we present a methodology for reducing the sensitivity to modelling errors and nonlinear effects by the...
A new method for robust fixed-order H∞ controller design for uncertain time-delayed MIMO systems is presented. It is shown that the H∞ robust performance condition can be represented by a set of convex constraints with respect to the parameters of a linearly parameterized primary controller in the Smith predictor structure. Therefore, the parameters of the primary controller can be obtained by convex...
This paper describes one novel design procedure for acquiring an optimal fractional PID (FPID) controller that rejects load disturbance under constraints on robustness and performance. The parameters of FPID controller have been tuned by using particle swarm optimization (PSO). FPID, apart from conventional gains kp, ki and kd, has two more parameters α and β to be optimized, being the non-integer...
This paper presents the basic concepts of the robust control design, applied on electro-hydraulic advance system of the Electro-Discharge Processing Machine (EDPM). The input-state-output (ISO) mathematical model of the EDPM is used to develop a robust controller, by H-infinite (H∞) synthesis techniques, which guarantee stability and performance. Using Matlab software facilities, have been simulated...
This paper considers a problem of optimally constructing smoothing spline curves for a given set of data. The curve is constituted by employing normalized uniform B-splines as basis functions. In particular, considering the case when a set of given data includes some outliers, we develop an algorithm for detecting such outliers so that L2 smoothing splines can be robustly constructed with the optimal...
The robust dimension reduction for classification of two dimensional data is discussed in this paper. The classification process is done with reference of original data. The classifying of class membership is not easy when more than one variable are loaded with the same information, and they can be written as a near linear combination of other variables. The standard approach to overcome this problem...
A high performance H∞ controller designed to control an Active Magnetic Bearing (AMB) system is considered in this paper. A digital signal processor (DSP) is used to implement the designed controller in real-time. The designed H∞ controller is compared with a conventional lead-lag type compensator and the on-board analogue controller of the AMB under various conditions and disturbances acting on the...
For a lightly damped flexible arm, an extra-insensitive (EI) shaper is an efficient logic to suppress the residual vibration of a flexible arm. Presently, the EI shaper is obtained approximately by a numerical solution on the assumption that damping ratio ζ and vibration tolerance Vtol are within some intervals. In this paper, we introduce a partially analytical EI shaper which is a closed form using...
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