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In this paper, an active disturbance rejection control (ADRC) with tracking differentiator (TD) solution is proposed and tested on a certain four operating condition model. The proposed system with a cascaded control scheme is constructed based on a linear Active disturbance rejection controller (LADRC) with parameters optimized under a modified fruit fly algorithm. The tracking performance could...
For the actuator uncertain nonlinear system, the paper proposed a nonsingular terminal sliding-mode (NTSM) control. The proposed strategy not only can eliminate the singularity problem but also can converge to the equilibrium point in finite time. The paper designed the controller for the two-order system and the higher-order uncertain actuator systems, respectively. The simulation results validate...
Construction vibration is a fast responding, multivariable coupled dynamic system. In this paper, an active disturbance rejection control (ADRC) solution is proposed and tested on a certain three-storey building model. The proposed system with a decentralized structure is free from complex decoupling which is hard to practice in actual application. Under ADRC framework, the influence of the entanglement...
In this paper, robust control applications for damping power systems low frequency oscillations (LFOs) are reviewed and compared, to reveal new research directions. With the analysis of LFO through the application of a single-machine infinite-bus (SMIB) model, design methods for Power System Stabilizers (PSSs) can generally be classified into three categories, H∞ control, H2 control, and mixed H∞/H...
This paper presents a H2 controller design approach for power system stabilizers (PSS) based on LMI pole constraints analysis for damping low frequency oscillations. A single machine infinite bus system and a Heffron-Phillips synchronous generator mathematical model are selected in order to compare the effectiveness of the proposed controller with conventional PSS (CPSS). The H2 robust control guarantees...
In this paper, a novel blind digital image watermarking scheme in contour let domain with singular value decomposition is proposed. In contrast to traditional methods where the watermark bits are embedded directly on the contourlet transform coefficients, the proposed scheme is based on watermark bits embedding on the singular value of the selected blocks within lowpass subband of the original gray...
In this paper, the authors propose a novel image watermarking scheme based on contourlet transform and singular value decomposition. We embed watermark bits in singular value vectors of the embedded blocks within lowpass subband in contourlet transform. We further adaptively apply quantization index modulation for embedding watermark according to energy distribution and human visual masking to achieve...
In this paper, we propose a novel hybrid DWT-DCT transform watermarking scheme. The original visually meaningful binary watermark image is preprocessed by using extended Arnold transform.The secret watermark bits are embedded on the singular values of the blocks within low frequency subband in host image hybrid DWT-DCT transform. To embed watermark imperceptibly,robustly and securely, we model the...
Extended Proportional Integral Derivative (EPID) is a model based control algorithm which consists of a conventional digital PID controller plus an additional compensator. This novel extension to the PID control algorithm offers the same properties as the IMC controller for a broad class of common industrial process models. EPID control simplifies the industrial implementation of IMC and has three...
Modelling error can be the cause of bad performance when optimal feed-rate profiles computed for a particular model are applied to the actual plant. This paper suggests the modification of the input trajectory from batch to batch, by using information from previous batches to modify the trajectories that are applied to the subsequent ones. The proposed approach does not required the remodeling of...
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