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Wyniki wyszukiwania dla: FLOW CONTROL VALVE
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Modelling of convective heat transfer in flow boiling.
PublikacjaW pracy przedstawiono rozważania dotyczące modelowania przepływu z wrzeniem w zastosowaniu do kanałów o małej średnicy. Stwierdzono,że stosowanie korelacji obowiązujących dla średnic konwencjonalnych nie sprawdza się z praktyką w przypadku małych średnic.
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A study of flow boiling heat transfer in minichannels
PublikacjaW pracy przedstawiono badania eksperymentalne wrzenia w przepływie w minikanale o średnicy wewnętrznej 2.3mm i długości 38cm. Uzyskano rozłady temperatury wzdłuż ścianki kanału oraz lokalne współczynniki przejmowania ciepła. Dane skorelowano z korelacją półempiryczną uzyskując zadowalającą zgodność.
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Inverse Integration of the Open Channel Flow Equations
PublikacjaW artykule przedstawiono metodę obliczeń umożliwiającą całkowanie równań przepływu nieustalonego w kanałach otwartych (równań de Saint Venanta) wstecz. Dyskutowano także przydatność równania retencji w zagadnieniu sterowania przepływem.
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Substance flow analysis for mercury emission in Poland
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Cost approach to the flow-shop construction scheduling
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Wave damping and smoothing in the unsteady pipe flow
Publikacjalaboratoryjne eksperymenty wykonane dla rur polietylenowych o różnej długości wykazały obecność takich zjawisk jak zmienna prędkość propagującej fali ciśnienia oraz jej intensywne tłumienie i wygładzanie. w artykule zaproponowano modyfikacje standardowych równań przepływu nieustalonego. polega ona na wprowadzeniu zmiennej prędkości fali oraz dyssypacji energii na jej czole opisanej członem dyfuzyjnym. do rozwiązania równań zaproponowano...
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Flow and pool boiling on porous coated surfaces
PublikacjaOmówiono wpływ powłoki porowatej na przebieg wrzenia w przepływie i w dużej objętości na przykładzie własnych badań eksperymentalnych.
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Experimental and theoretical analysis of dryout in annular flow
PublikacjaW pracy opisano badania eksperymentalne kryzysu wrzenia typu dryout, przeprowadzone w pionowych rurkach o średnicy wewnętrznej 1.15 i 2.3 mm z wykorzystaniem dwóch czynników roboczych, tj. SES36 i R123. W oparciu o wyniki tych badań zaproponowano ogólną korelację na krytyczny strumień ciepła w minikanałach.
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Flow and pool boiling on porous coated surfaces
PublikacjaPrzedstawiono wyniki badań eksperymentalnych wrzenia na:a)rurkach i płytkach z powłokami porowatymi o różnej grubości i porowatości, b) rurkach, których jedynie górna część była pokryta powłoką porowatą, c) pęku rur wykonanym z rurek z powłoką porowatą. Zaprezentowano również wyniki pomiarów współczynnika przejmowania ciepła i spadku ciśnienia podczas wrzenia w w przepływie wybranych czynników chłodniczych i ich mieszanin z olejem...
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Flow and solute transport in porous media systems
PublikacjaPraca przedstawia podstawowe procesy fizyczne zachodzące w środowisku glebowym. Rozpoczyna się od omówienia zjawisk cieplnych i efektów temperaturowych, a następnie omawia się zjawiska dyfuzyjne i natlenienie gleby. Potem omawia się dynamikę uwilgotnienia gleb i pobierania wody przez korzenie roślinne, jak też migrację zanieczyszczeń. Pracę kończy rozdział dotyczący oczyszczania ścieków w systemie glebowo-roślinnym.
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Investigations of resonance effects during silo flow.
PublikacjaOmówiono problem efektów rezonansowych podczas przepływu materiału sypkiego w silosie. Wykonano badania doświadczalne w dużych i małych silosach. Obliczenia MES wykonano dla płaskiego stanu odkształcenia. Zachowanie materiału sypkiego było modelowane mikropolarnym sprężysto-plastycznym prawem wg Mh hausa. W obliczeniach uwzględniono wpływ ścian. Wyniki numeryczne porównano z doświadczeniami w dużych i małych silosach.
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Application of a cellular automata model to granular flow
PublikacjaPrzedstawiono wyniki modelowania przepływów granulowanych przy zastosowaniu automatu komórkowego. Obliczenia wykonano dla silosów ze wstawkami i ścianką szczelną. Przyjęto różne schematy propagacji ziaren.
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Application of an improved cellular automaton for granular flow.
PublikacjaW artykule omówiono wyniki numeryczne z zastosowaniem ulepszonego aparatu komórkowego do przepływów silosowych materiałów granulowanych. W modelu uwzgledniono zderzenia cząstek i dysypację energii. Wyniki porównano z wynikami badań modelowych.
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Coupled Urban Areas Inundation Model with Interaction Between Storm Water System and Surface Flow - Case Study of Sea Level Impact on Seaside Areas Flooding
PublikacjaInundations are becoming more frequent than ever. What is connected with increasing area of impervious surface in cities. This makes predicting urban flooding and its scale especially important. At the seaside we observe additional conditions such as sea level that makes accurate numerical modelling of issue even harder. With complex approach to the matter which is simultaneous calculation of storm water conduit flow and overland...
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Nonlinear finite element modeling of vibration control of plane rod-type structural members with integrated piezoelectric patches
PublikacjaThis paper addresses modeling and finite element analysis of the transient large-amplitude vibration response of thin rod-type structures (e.g., plane curved beams, arches, ring shells) and its control by integrated piezoelectric layers. A geometrically nonlinear finite beam element for the analysis of piezolaminated structures is developed that is based on the Bernoulli hypothesis and the assumptions of small strains and finite...
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Experimental study and comparison with predictive methods for flow boiling heat transfer coefficient of HFE7000
PublikacjaThis article describes an experimental study of flow boiling of HFE7000 inside a smooth vertical channel. The investigation has been carried out in a circular stainless-steel tube with an inner diameter of 2.3 mm. The data have been collected for the applied heat fluxes q ranging from 61 to 205 kW/m2, the mass flux G ranging from 214 to 1006 kg/(m2 s), the saturation temperature Tsat ranging from 30 to 54 °C and the full range...
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Modelling hydraulic and capillary-driven two-phase fluid flow in unsaturated concretes at the meso-scale with a unique coupled DEM-CFD technique
PublikacjaThe goal of the research was to demonstrate the impact of thin porous interfacial transition zones (ITZs) between aggregates and cement matrix on fluid flow in unsaturated concrete caused by hydraulic/capillary pressure. To demonstrate this impact, a novel coupled approach to simulate the two-phase (water and moist air) flow of hydraulically and capillary-driven fluid in unsaturated concrete was developed. By merging the discrete...
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Potential and limits of landfill leachate treatment in a multi-stage subsurface flow constructed wetland – evaluation of organics and nitrogen removal
PublikacjaConstructed wetlands have potential of treating wastewater of poor biodegradability. The performance of a multistage sub-surface flow wetland treating municipal landfill leachate was assessed during three years of operation. During the study three research periods with different operation conditions were established. The hydralic loads, operation mode of vertical flow beds and type of treated wastewater (raw leachate – leachate...
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Robust-adaptive dynamic programming-based time-delay control of autonomous ships under stochastic disturbances using an actor-critic learning algorithm
PublikacjaThis paper proposes a hybrid robust-adaptive learning-based control scheme based on Approximate Dynamic Programming (ADP) for the tracking control of autonomous ship maneuvering. We adopt a Time-Delay Control (TDC) approach, which is known as a simple, practical, model free and roughly robust strategy, combined with an Actor-Critic Approximate Dynamic Programming (ACADP) algorithm as an adaptive part in the proposed hybrid control...
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Impact of R/X ratio of distribution network on selection and control of energy storage units
PublikacjaThe interest in energy storage is still increasing. Energy storage units are installed in high voltage networks, medium voltage networks and low voltage distribution networks as well. These units are often used to improve power quality. One of the criteria for improving power quality is reducing voltage deviations. Depending on the type of network and specifying its R/X ratio, this criterion can be fulfilled by control of active...
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Laboratory bioreactor with pH control system for investigations of hydrogen production in the dark fermentation process
PublikacjaThe work presents the construction of a low-cost research bioreactor equipped with a pH control sys-tem. The developed bioreactor was applied for hydrogen production in the dark fermentation process using Enterobacter aerogenes ATCC 13048. Presented paper compares the results obtained during the process without and with pH regulation for different feed materials: glucose, energetic poplar hydro-lysates, acid whey and glycerol....
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Comparative Study of Balancing SRT by Using Modified ASM2d in Control and Operation Strategy at Full-Scale WWTP
PublikacjaDetailed knowledge on the composition of the influent going into the wastewater treatment system is essential for the development of a reliable computer model. In the context of WWTPs (wastewater treatment plants), the wastewater characteristics are not only important for activated sludge system modelling, but also have an impact on the appropriate control of single unit operations. The aim of this study was to evaluate the concepts...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.40, b=0.26) and (C=2.10, b=0.14) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.80, b=0.25) and (C=2.00, b=0.11) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.40, b=0.26) and (C=2.80, b=0.25) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.40, b=0.26) and (C=2.00, b=0.11) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.80, b=0.25) and (C=5.70, b=0.32) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.80, b=0.25) and (C=2.10, b=0.14) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.00, b=0.11) and (C=5.70, b=0.32) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.10, b=0.14) and (C=5.70, b=0.32) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.00, b=0.11) and (C=2.10, b=0.14) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.00, b=0.11) and (C=5.50, b=0.37) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.40, b=0.26) and (C=5.70, b=0.32) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=5.50, b=0.37) and (C=5.70, b=0.32) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.10, b=0.14) and (C=5.50, b=0.37) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.80, b=0.25) and (C=5.50, b=0.37) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Determination of flow properties of a parallel connection of two pneumatic elements with (C=2.40, b=0.26) and (C=5.50, b=0.37) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of parallel connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for two directional control valves arranged in parallel. Three test configurations were used: (1) being emptied tank -> the first DCV -> ambient atmosphere, (2) being...
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Designing Control and Protection Systems with Regard to Integrated Functional Safety and Cybersecurity Aspects
PublikacjaThis article addresses current problems of risk analysis and probabilistic modelling for functional safety management in the life cycle of safety-related systems. Two main stages in the lifecycle of these systems are distinguished, namely the design and operation. The risk analysis and probabilistic modelling differ in these stages in view of available knowledge and data. Due to the complexity and uncertainty involved, both qualitative...
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Scheduling for Industrial Control Traffic Using Massive MIMO and Large Intelligent Surfaces
PublikacjaIndustry 4.0, with its focus on flexibility and customizability, is pushing in the direction of wireless communication in future smart factories, in particular massive multiple-input multiple-output (MIMO), and its future evolution Large Intelligent Surfaces (LIS), which provide more reliable channel quality than previous technologies. As such, there arises the need to perform efficient scheduling of industrial control traffic...
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ASIAN JOURNAL OF CONTROL
Czasopisma -
JOURNAL OF VIBRATION AND CONTROL
Czasopisma -
Studies in Informatics and Control
Czasopisma -
Human Factors and Functional Safety Analysis in Designing the Control Rooms of Industrial Hazardous Plants
PublikacjaIn this work some aspects of human factors and functional safety analysis in designing the control rooms of industrial hazardous plants are presented. The “defence in depth” (D-in-D) concept is outlined. Some designing issues of the alarm system (AS) with regard to human factors to be supported using the human reliability analysis (HRA) are discussed. The AS and decision support system (DSS), when properly designed, would contribute...
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The protocol for using elastic wall model in modeling blood flow within human artery
PublikacjaMedical diagnostic tools will play a major role in the future for an effective patient treatment and reduction their mortality, related to the cardiovascular system diseases (CVDs). There is an urgent need for developing diagnostic procedure to be robust, reliable, accurate and efficient, in the framework of a paradigm shift. Application of numerical techniques is seen as a perspective tool for such purpose. Nevertheless, existing...
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Advanced Control With PLC—Code Generator for aMPC Controller Implementation and Cooperation With External Computational Server for Dealing With Multidimensionality, Constraints and LMI Based Robustness
PublikacjaThe manufacturers of Programmable Logic Controllers (PLC) usually equip their products with extremely simple control algorithms, such as PID and on-off regulators. However, modern PLCs have much more efficient processors and extensive memory, which enables implementing more sophisticated controllers. The paper discusses issues related to the implementation of matrix operations, time limitations for code execution within one PLC...
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Towards Knowledge Formalization and Sharing in a Cognitive Vision Platform for Hazard Control (CVP-HC)
PublikacjaHazards are present in all workplaces and can result in serious injuries, short and long-term illnesses, or death. In this context, management of safety is essential to ensure the occupational health of workers. Aiming to assist the safety manage-ment process, especially in industrial environments, a Cognitive Vision Platform for Hazard Control (CVP-HC) has been proposed. The CVP-HC is a scalable yet adaptable system capable of...
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Adaptive dynamic control allocation for over-actuated dynamic positioning system based on backstepping method in case of thruster faults
PublikacjaThe objective of the research considered in this paper is dynamic positioning of a nonlinear over-actuated marine vessel in the presence of limited information about thruster forces. First, the adaptive backstepping method is used to estimate the input matrix which will compensate partial loss of actuator effectiveness in the presence of actuator dynamics. Then, the adaptive commanded virtual forces and moment are allocated into...
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Comparison of Average Energy Slope Estimation Formulas for One-dimensional Steady Gradually Varied Flow
PublikacjaTo find the steady flow water surface profile, it is possible to use Bernoulli’s equation, which is a discrete form of the differential energy equation. Such an approach requires the average energy slope between cross-sections to be estimated. In the literature, many methods are proposed for estimating the average energy slope in this case, such as the arithmetic mean, resulting in the standard step method, the harmonic mean and...
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An Extended Control of the Input Angle for Matrix Converters Connected with the Non-Unity Power Factor Loads.
PublikacjaThis paper proposes a novel PWM modulation algorithm for Multiphase Conventional Matrix Converters (MCMC), with 3 inputs and k outputs, using the transfer function of the load angle. The proposed approach extends the range of power angle control at the input during the operation with a maximum voltage transfer ratio. The proposed concept is based on the Direct Analytic Voltage PWM (DAV--PWM) modulation with an elliptical trajectory...
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Control Engineering and Applied Informatics
Czasopisma