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Uncertainty and disturbance estimator-based model predictive control for wet flue gas desulphurization system

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Chinese Journal of Chemical Engineering 2024年第3期67卷 182-194页

作者： Shan Liu Wenqi Zhong Li Sun Xi Chen rafal Madonski School of Energy and Environment Key Laboratory of Energy Thermal Conversion and Control of Ministry of EducationSoutheast UniversityNanjing 210096China Faculty of Automatic Control Electronics and Computer ScienceSilesian University of TechnologyGliwise 44-100Poland

Wet flue gas desulphurization technology is widely used in the industrial process for its capability of efficient pollution *** desulphurization control system,however,is subjected to complex reaction mechanisms and severe disturbances,which make for it difficult to achieve certain practically relevant control goals including emission and economic performances as well as system *** address these challenges,a new robust control scheme based on uncertainty and disturbance estimator(UDE)and model predictive control(MPC)is proposed in this *** UDE is used to estimate and dynamically compensate acting disturbances,whereas MPC is deployed for optimal feedback regulation of the resultant *** viewing the system nonlinearities and unknown dynamics as disturbances,the proposed control framework allows to locally treat the considered nonlinear plant as a linear *** obtained simulation results confirm that the utilization of UDE makes the tracking error negligibly small,even in the presence of unmodeled *** the conducted comparison study,the introduced control scheme outperforms both the standard MPC and PID(proportional-integral-derivative)control strategies in terms of transient performance and ***,the results reveal that a lowpass-filter time constant has a significant effect on the robustness and the convergence range of the tracking error.

关键词： Desulphurization system Disturbance rejection Model predictive control Uncertainty and disturbance estimator Nonlinear system

Wide-angle digital holography with aliasing-free recording

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Photonics Research 2024年第5期12卷 1098-1106页

作者： rafal KUKOLOWICZ IZABELA GEREJ TOMASZ KOZACKI Institute of Micromechanics and Photonics Warsaw University of Technology02-525 WarsawPoland

High-quality wide-angle holographic content is at the heart of the success of near-eye display *** work proposes the first digital holographic(DH)system enabling recording wide-angle scenes assembled from objects larger than the setup field of view(FOV),which can be directly replayed without 3D deformation in the near-eye *** hologram formation in the DH system comprises free space propagation and Fourier transform(FT),which are connected by a rectangular ***,the object wave propagates in free space to the rectangular ***,the band-limited wavefield is propagated through the single lens toward the camera *** rectangular aperture can take two sizes,depending on which DH operates in off-axis or phase-shifting recording *** integral part of the DH solution is a numerical reconstruction algorithm consisting of two elements:fringe processing for object wave recovery and wide-angle propagation to the object *** second element simulates propagation through both parts of the experimental *** free space part is a space-limited angular spectrum compact space algorithm,while for propagation through the lens,the piecewise FT algorithm with Petzval curvature compensation is *** the experimental part of the paper,we present the wide-angle DH system with FOV25°×19°,which allows high-quality recording and reconstruction of large complex scenes.

关键词： recording angle holographic

Tuning and implementation variants of discrete-time ADRC

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Control Theory and Technology 2023年第1期21卷 72-88页

作者： Gernot Herbst rafal Madonski University of Applied Sciences Zwickau ZwickauGermany Energy and Electricity Research Center Jinan UniversityGuangzhouChina

Practical implementations of active disturbance rejection control(ADRC)will almost always take place in discretized *** applications may have quite different needs regarding their discrete-time controllers,this article summarizes and extends the available set of ADRC implementations to provide a suitable variant for as many as possible use *** doing so,the gap between quasi-continuous and discrete-time controller tuning is closed for applications with low sampling *** main contribution of this article is the derivation of three different discrete-time implementations of error-based *** is shown that these are almost one-to-one counterparts of existing output-based implementations,to the point where transfer functions and coefficients can be reused in unaltered *** this way,error-based implementations become firmly rooted in the established landscape of discrete-time ***,it becomes possible to equip error-based variants with windup protection abilities known from output-based ADRC.

关键词： Active disturbance rejection control(ADRC)-Error-based form Controller tuning Discretization

ADRC in output and error form:connection,equivalence,performance

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Control Theory and Technology 2023年第1期21卷 56-71页

作者： rafal Madonski Gernot Herbst Momir Stankovic Energy and Electricity Research Center Jinan UniversityZhuhaiChina University of Applied Sciences ZwickauGermany University of Defence BelgradeSerbia

In this work,we investigate two specific linear ADRC structures,namely output-and *** former is considered a“standard”version of ADRC,a title obtained primarily thanks to its simplicity and effectiveness,which have spurred its adoption across multiple *** latter is found to be especially appealing to practitioners as its feedback error-driven structure bares similarities to conventional control solutions,like PI and *** this paper,we describe newly found connections between the two considered ADRC structures,which allowed us to formally establish conditions for their ***,the conducted comprehensive performance comparison between output-and error-based ADRCs has facilitated the identification of specific modules within them,which can now be conveniently used as building blocks,thus aiding the control designers in customizing ADRC-based solutions and making them most suitable for their applications.

关键词： Active disturbance rejection control(ADRC)-Output-based form Error-based form Equivalence condition:Comparative analysis

On a novel tracking differentiator design based on iterative learning in a moving window

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Control Theory and Technology 2023年第1期21卷 46-55页

作者： Xiangyang Li rafal Madonski Zhiqiang Gao Senping Tian Key Laboratory of Autonomous Systems and Network Control Ministry of EducationSchool of Automation Science and EngineeringSouth China University of TechnologyGuangzhou 510641China Energy and Electricity Research Center Jinan UniversityZhuhai 519070China Department of Electrical and Computer Science Cleveland State UniversityClevelandOH 44115USA

Differential signals are key in control engineering as they anticipate future behavior of process variables and therefore are critical in formulating control laws such as proportional-integral-derivative(PID).The practical challenge,however,is to extract such signals from noisy measurements and this difficulty is addressed first by *** in the form of linear and nonlinear tracking differentiator(TD).While improvements were made,TD did not completely resolve the conflict between the noise sensitivity and the accuracy and timeliness of the *** two approaches proposed in this paper start with the basic linear TD,but apply iterative learning mechanism to the historical data in a moving window(MW),to form two new iterative learning tracking differentiators(IL-TD):one is a parallel IL-TD using an iterative ladder network structure which is implementable in analog circuits;the other a serial IL-TD which is implementable digitally on any computer *** algorithms are validated in simulations which show that the proposed two IL-TDs have better tracking differentiation and de-noise performance compared to the existing linear TD.

关键词： Tracking differentiator(TD) Iterative learning Iterative learning tracking differentiator(IL-TD) Active disturbance rejection control(ADRC)-Two-dimensional system(2-D system)

Use of coals and wastes in a co-gasification process aimed at producing hydrogen rich gas

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International Journal of Coal Science & Technology 2022年第6期9卷 161-167页

作者： rafal Gssior Adam Smoliński Polish Mining Group Inc. KatowicePoland Central Mining Institute KatowicePoland

The use of low-quality coals and flotoconcentrates is currently severely limited,and the problem of managing municipal waste from anthropogenic activities is currently a *** problems of reducing carbon dioxide emissions,utilizing the energy potential of waste and increasing its recycling have an impact on the costs of electricity *** the abundant streams of unused fuels,they can be considered as attractive energy materials,so environmentally-friendly and cost-effective options for their utilization should be developed.A study was conducted using steam co-gasification technology on selected coals,flotation concentrates and Refuse Derived Fuel(RDF)alternative *** low-quality coals were combined with RDF alternative fuel in a process aimed at hydrogen *** experiments produced gas with hydrogen concentrations ranging from 67%(vol.)to 68%(vol.)with low methane *** was observed that the addition of alternative fuels helped to increase the hydrogen concentration in *** was paid to the catalytic ability of the metal oxides contained in the fuel blend,with particular reference to K_(2)O and Al_(2)O_(3)and TiO_(2).

关键词： Coal Hydrogen Flotation concentrate Refuse derived fuel Catalytic capacity Catalysts

Influence of seven levels of chemical/biostimulator protection on amino acid profile and yield traits in wheat

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The Crop Journal 2022年第4期10卷 1198-1206页

作者： Piotr Iwaniuk rafal Konecki Piotr Kaczynski Alua Rysbekova Bozena Lozowicka Institute of Plant Protection-National Research Institute Chelmonskiego 22 Street15–195 BialystokPoland Kazakh National Agrarian Research University Department of Plant ProtectionAbai Avenue 8Almaty 050010Kazakhstan

Biostimulators combined with pesticides can reduce the need for chemical crop protection to yield healthy wheat with high grain quality and nutritional *** goal of this four-year field study was an assessment of the effects of seven levels of sulfonylurea herbicide,morpholine and triazole fungicides,and humic biostimulator protection on concentrations of 20 amino acids(AAs)and on yield parameters under diverse climatic *** of pesticides and biostimulators reduced amino acid *** applied alone reduced AAs ***(herbicide+fungicide)protection or its combination with humic biostimulator were the most effective strategies for increasing yield,thousand-kernel weight,spike number,grain surface area,and wet *** dosages of fungicides showed effects on AA content and crop parameter values similar to those of the recommended dosages of fungicides and are in line with the European Commission’s “From Farm to Fork”*** biostimulators as agents supporting pesticide protection should be optimized for wheat growth stage to achieve the most desirable wheat parameters and implemented in agricultural practice.

关键词： Amino acids Biostimulators Plant protection products Wheat quality Yield

An Optimal Algorithm for Resource Allocation in D2D Communication

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Computers, Materials & Continua 2023年第4期75卷 531-546页

作者： Shahad Alyousif Mohammed Dauwed rafal Nader Mohammed Hasan Ali Mustafa Musa Jabar Ahmed Alkhayyat Research Centre University of MashreqBaghdadIraq College of Engineering Department of Electrical&Electronic EngineeringGulf UniversityAlmasnadKingdom of Bahrain Medical Instrumentation Techniques Engineering Dijlah University CollegeBaghdadIraq Department of Pharmacy Al-Mustaqbal University CollegeHilla51001Iraq Computer Techniques Engineering Department Faculty of Information TechnologyImam Ja’afar Al-Sadiq UniversityNajaf10023Iraq Department of Medical Instruments Engineering Techniques Al-Turath University CollegeBaghdad10021Iraq Department of Medical Instruments Engineering Techniques Al-Farahidi UniversityBaghdad10021Iraq College of Technical Engineering The Islamic UniversityNajafIraq

The number of mobile devices accessing wireless networks isskyrocketing due to the rapid advancement of sensors and wireless communicationtechnology. In the upcoming years, it is anticipated that mobile datatraffic would rise even more. The development of a new cellular networkparadigm is being driven by the Internet of Things, smart homes, and moresophisticated applications with greater data rates and latency *** are being used up quickly due to the steady growth of smartphonedevices andmultimedia apps. Computation offloading to either several distantclouds or close mobile devices has consistently improved the performance ofmobile devices. The computation latency can also be decreased by offloadingcomputing duties to edge servers with a specific level of computing ***-to-device (D2D) collaboration can assist in processing small-scaleactivities that are time-sensitive in order to further reduce task delays. The taskoffloading performance is drastically reduced due to the variation of differentperformance capabilities of edge nodes. Therefore, this paper addressed thisproblem and proposed a new method for D2D communication. In thismethod, the time delay is reduced by enabling the edge nodes to exchangedata samples. Simulation results show that the proposed algorithm has betterperformance than traditional algorithm.

关键词： D2D communication resource allocation latency optimization

Determination of convergence of underground gas storage caverns using non-invasive methodology based on land surface subsidence measurement

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第8期15卷 1944-1950页

作者： rafal Misa Anton Sroka Mateusz Dudek Krzysztof Tajdus Stefan Meyer Instytut Mechaniki Górotworu PAN ul.Reymonta 2730-059KrakówPoland Salzgewinnungsgesellschaft Westfalen mbH&Co.KG(SGW) AhausGermany

Undergroundgas storage caverns aremonitoredfor environmental safety in termsof equipmentandpotential emissions,particularly methane emissions from the underground and above-ground parts of the storage *** measurements of land surface deformations and costly echometric measurements of convergence of individual storage facilities are carried *** aims of environmental monitoring are:(1)to eliminate potential hazards in the shortest time,(2)assess the overall impact of intensive operation of storage facilities on the environment,(3)developmonitoringmethods relevant to environmental protection,and(4)take actions in case of *** paper presents a solution to the problem of determination of the convergence of underground caverns in a salt rock mass based on the results of land surface subsidence measurements carried out using the Gauss-Markov equalization *** makes it possible for ongoing control of cavern volume convergence after each subsidence measurement on the ground surface and determining the actual impact of the use frequency(injection-mediumconsumption)on the convergence in *** presentedmethodology is universal and verified on caverns located in a salt *** Gauss-Markov inversion model is the first used in this area,hence its application is significant.

关键词： Underground storage Salt cavern Convergence Subsidence Surface deformation