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control valve simulation method integrable into the global gradient algorithm

ISH Journal of Hydraulic Engineering 2025年第1期31卷 1-7页

作者： Sivakumar, P. Gorev, N.B. Gorev, V.N. Kodzhespirova, I.F. Shedlovsky, I.A. Itanagar India Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipro Ukraine Department of Physics Dnipro University of Technology Dnipro Ukraine Department of Automation and Computer Systems Dnipro University of Technology Dnipro Ukraine

This paper presents a refinement of a method that simulates flow- and pressure-regulating valves by replacing them with pipes and adjusting the resistances (diameters) of those pipes to meet the valve settings. The method, referred to as the replacing pipe method (RPM), is readily integrable into the global gradient algorithm, which is the heart of the commonly used EPANET 2 water distribution system modeling software. The RPM proved to be more robust, yet slower than the EPANET 2 valve handling heuristics. In this work, the RPM was modified to increase its computational speed. The modification involved the RPM check valve handling algorithm and condition for updating the diameters of the valve-replacing pipes. The modified RPM was tested as part of a hybrid simulator, which switches from the EPANET 2 valve handling heuristics to the RPM when the former fails. The test networks included a large network with thousands of nodes, pipes, and valves, and a case of an ill-posed problem. As the testing showed, the modified RPM offers a significant reduction in the number of iterations compared to its previous version. © 2024 Indian Society for Hydraulics.

关键词： Safety valves

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Motion sensing by microwave interferometry using two electric probes 2

Motion sensing by microwave interferometry using two electri...

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2nd International Young Scientists Forum on Applied Physics and Engineering, YSF 2016

作者： Pylypenko, O.V. Doronin, A.V. Gorev, N.B. Kodzhespirova, I.F. Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

ISBN: (纸本)9781467388412

This paper addresses the possibility of displacement measurement by microwave interferometry at an unknown reflection coefficient with the use of two electric probes mounted in a waveguide section. The aim of this paper is to show that the displacement measurement accuracy can be improved by using an interprobe distance other than its conventional value. The measurement error as a function of the interprobe distance is analyzed with the inclusion of variations of the currents of the semiconductor detectors connected to the probes from their theoretical values. Based on the results of this analysis, the interprobe distance is suggested to be one tenth of the guided operating wavelength. In comparison with the conventional interprobe distance, its suggested value offers a marked reduction in the measurement error for reflection coefficients close to unity, while for smaller ones this error remains much the same. © 2016 IEEE.

关键词： Reflection

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Determination of biconical cavity eigenfrequencies using fractional-rational approximation of its response obtained as solution of excitation problem 21

Determination of biconical cavity eigenfrequencies using fra...

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21st International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, DIPED 2016

作者： Andreev, M.V. Drobakhin, O.O. Saltykov, D. Yu. Gorev, N.B. Kodzhespirova, I.F. Department of Applied and Computer Radiophysics Oles Honchar Dnipropetrovsk National University Dnipropetrovsk Ukraine Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

ISBN: (纸本)9781509061761

The solution of the excitation problem for the biconical cavity analysis by overlapping domain decomposition in combination with the collocation method has been examined. For determination of eigenfrequencies, the fractional-rational approximation of the cavity frequency response with its excitation has been used. Using the proposed approach the cone angle dependence of the eigenfrequencies of the azimuthal-symmetric oscillations of the biconical cavity has been obtained. © 2016 IEEE.

关键词： Frequency response

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On the study of the resonant properties of a biconical cavity with a dielectric rod using the quasiregular approximation method

On the study of the resonant properties of a biconical cavit...

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International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

作者： P. Zabolotnyy Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

The eigenfrequencies of a truncated biconical cavity with a dielectric cylinder are calculated as a function of the dielectric permittivity of the cylinder and the cone angles. The results of analytical calculation by the quasiregular approximation method are compared with the numerical results obtained using the classical scheme of the finite-element method. The range of cone angles in which the quasiregular approximation method is applicable is reported.

关键词： Cavity resonators Dielectrics Approximation methods Finite element analysis Permittivity Q-factor Electromagnetics

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Motion sensing by microwave interferometry using two electric probes

Motion sensing by microwave interferometry using two electri...

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International Young Scientists Forum on Applied Physics (YSF)

作者： O. V. Pylypenko A. V. Doronin N. B. Gorev I. F. Kodzhespirova Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

关键词： Reflection coefficient Probes Displacement measurement Antenna measurements Microwave measurement Microwave theory and techniques Detectors

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Two-probe displacement measurement by microwave interferometry

Two-probe displacement measurement by microwave interferomet...

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International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

作者： O. V. Pylypenko A. V. Doronin N. B. Gorev I. F. Kodzhespirova Department of Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

It is shown that the displacement of a target can be measured by microwave interferometry at an unknown reflection coefficient to reasonable accuracy with the use of as few as two probes. A two-probe displacement meas... 详细信息

关键词： Displacement measurement Reflection coefficient Probes Semiconductor device measurement Measurement uncertainty Microwave measurement Microwave theory and techniques

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Open-ended Microwave Biconical Cavity for the Determination of the Average Electron Density in a Low-temperature Plasma

Open-ended Microwave Biconical Cavity for the Determination ...

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Ukrainian Microwave Week (UkrMW), IEEE

作者： Petro Zabolotnyi Department for Functional Elements of Control Systems Institute of Technical Mechanics of NASU and SSAU Dnipro Ukraine

ISBN: (纸本)9798350331530

Studies have been conducted with the goal of obtaining an estimate of the range of applicability of open-ended biconical microwave resonators for determination of the average electron density in low-temperature plasma. It is shown that open-ended biconical microwave resonators make it possible to measure the plasma electron density over a wider range than cylindrical resonators.

关键词： Microwave measurement Density measurement Resonant frequency Low-temperature plasmas Plasma measurements Frequency measurement Resonators

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Displacement measurement using a two- probe implementation of microwave inter- ferometry

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Progress In Electromagnetics Research C 2012年 32卷 245-258页

作者： Doronin, A.V. Gorev, Nikolai B. Kodzhespirova, I.F. Privalov, E.N. Department for Functional Elements of Control Systems Institute of Technical Mechanics National Academy of Sciences of Ukraine 15 Leshko-Popel St. Dnepropetrovsk 49005 Ukraine

This paper presents a two-probe implementation of microwave interferometry for displacement measurement at an unknown reflection coeffcient. Theoretically, the proposed technique gives the exact value of the displacement for reflection coeffcients (at the location of the probes) no greater than 1/√2 and in the general case determines it to a worst-case accuracy of about 4.4% of the operating wavelength. Its experimental verification has demonstrated reasonable measurement accuracy for displacements several times as great as the operating wavelength (in real-time measurements at a free-space wavelength of 3 cm for a peak-to peak vibration amplitude of 15 cm, the maximum error in the determination of the instantaneous relative displacement and the peak-to-peak amplitude was about 3mm and about 1 mm, respectively).

关键词： Displacement measurement

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Calculation of biconical cavity eigenfrequencies by the overlapping domain decomposition method in combination with the collocation method

Calculation of biconical cavity eigenfrequencies by the over...

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International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

作者： M. V. Andreev O. O. Drobakhin D. Yu. Saltykov N. B. Gorev I. F. Kodzhespirova Department of Applied and Computer Radiophysics Oles Honchar Dnipropetrovsk National University Dnipropetrovsk Ukraine Department for Functional Elements of Control Systems Institute of Technical Mechanics Dnipropetrovsk Ukraine

This paper presents a simple technique for the calculation of the eigenfrequencies of biconical cavities using the overlapping domain decomposition method in combination with the collocation method, which converges ra... 详细信息

ISBN: (纸本)9781509019571

关键词： Cavity resonators Electric fields Resonant frequency Frequency measurement Mathematical model Temperature measurement

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Determination of biconical cavity eigenfrequencies using fractional-rational approximation of its response obtained as solution of excitation problem

Determination of biconical cavity eigenfrequencies using fra...

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International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

ISBN: (纸本)9781509061778

关键词： Cavity resonators Frequency response Eigenvalues and eigenfunctions Electric fields Electromagnetic scattering Acoustic waves

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