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Wyniki wyszukiwania dla: FINITEELEMENT MODELING
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Determination of COD Fractionation as a Key Factor for Appropriate Modelling and Monitoring of Activated Sludge Processes
PublikacjaAn operation of wastewater treatment plant is usually controlled by global parameters such as flow, solids retention time, sludge age, concentration of ammonia and dissolved oxygen, etc. It is considered that, together with the chemical and biological oxygen demand (COD and BOD), those parameters indirectly exhibit the effectiveness of activated sludge processes. Especially the BOD indicate the amount of organic pollution that...
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FEM-based wave propagation modelling for SHM: Certain numerical issues in 1D structures
PublikacjaThe numerical modelling of structural elements is an important aspect of modern diagnostic systems. However, the process of numerical implementation requires advanced levels of consideration of multiple aspects. Important issues of that process are the positive and negative aspects of solution applied methods. Therefore the aim of this article is to familiarise the reader with the most important aspects related to the process of...
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Modelling of Longitudinal Elastic Wave Propagation in a Steel Rod Using the Discrete Element Method
PublikacjaThe paper deals with the issue of modelling elastic wave propagation using the discrete element method (DEM). The case of a longitudinal wave in a rod with a circular cross-section was considered. A novel, complex algorithm consisting of the preparation of models and simulation of elastic waves was developed. A series of DEM models were prepared for simulations, differing in discretisation and material parameters. Additional calculations...
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Numerical modelling and analysis of steel specimens subjected to marine immersed corrosion and tensile load
PublikacjaThe present study develops numerical models to analyse the behaviour of steel specimens subjected to marine immersed corrosion degradation and tensile load. The finite element method with the use of the explicit dynamic solver LS-DYNA, satisfying the quasi-static conditions, is employed. Two numerical models are developed, where in the first one, the scans of surfaces gathered from corroded plate specimens are implemented directly...
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Fluid–solid interaction on a thin platelet with high-velocity flow: vibration modelling and experiment
PublikacjaThe paper concerns the nonlinear behaviour of a thin platelet that is streamlined in an aerodynamic tunnel. The air velocity in the aerodynamic tunnel was at 858.9 km/h or 0.7 Ma (Ma—Mach number is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound). This experiment was numerically simulated using FSI (fluid–solid interaction) tools, namely the coupling...
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Strategic risk modelling in highway engineering/Modelowanie ryzyka strategicznego w inżynierii drogowej
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Integrated model for the fast assessment of flood volume: Modelling – management, uncertainty and sensitivity analysis
PublikacjaThe specific flood volume is an important criterion for assessing the performance of sewage networks. It has been shown that its value is greatly influenced by the layout of the sewers in the catchment area, which is usually expressed by a fractal dimension. Currently, only mechanistic models (such as SWMM) enable the determination of the impact of the layout of the sewers on flooding volume, but they require additional and robust...
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Biological processes modelling for MBR systems: A review of the state-of-the-art focusing on SMP and EPS
PublikacjaA mathematical correlation between biomass kinetic and membrane fouling can improve the understanding and spread of Membrane Bioreactor (MBR) technology, especially in solving the membrane fouling issues. On this behalf, this paper, produced by the International Water Association (IWA) Task Group on Membrane modelling and control, reviews the current state-of-the-art regarding the modelling of kinetic processes of biomass, focusing on...
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Discrete modelling results of a direct shear test for granular materials versus FE results
PublikacjaArtykuł porównuje wyniki DEM i MES dla testu bezpośredniego ścinania materiałów granulowanych. Obliczenia MES wykonano przy zastosowaniu mikropolarnego modelu hipoplastycznego. W obliczeniach DEM z kulami i momentami kontaktu zwrócono uwagę na zjawiska mikrostrukturalne w strefie ścinania na poziomie ziaren.
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Modelling of strain localization in quasi-brittle materials with coupled elasto-plastic-damage model
PublikacjaW artykule przedstawiono wyniki numerycznej dla zginania belki betonowej przy zastosowaniu połączonego modelu sprężysto-plastycznego z degradacja sztywności. Do opisu rys, model rozszerzono o nielokalność.
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Numerical Modelling of Shear Localization in Granular Bodies using MPM and Non-local Hypoplasticity
PublikacjaThe paper deals with modelling of shear localization in granular bodies by means of an enhanced hypoplastic constitutive model and material point method (MPM). The calculations were carried out for plane strain compression of non-cohesive sand. In order to properly capture the width and inclination of shear zones, the constitutive model was enriched by a characteristic length of micro-structure by means of a non-local theory....
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Pomiarowa weryfikacja wybranych modeli propagacyjnych
PublikacjaWciąż rosnące zapotrzebowanie na usługi wymagające coraz większej przepływności oraz jakości stawia projektanta sieci radiokomunikacyjnej w niełatwej sytuacji. W celu wspomagania projektanta w tym skomplikowanym zadaniu, opracowano liczne modele tłumienia propagacyjnego. Jednym z podstawowych zjawisk zachodzących w kanale radiowym jest tłumienie sygnału. Stanowi ono jeden z najważniejszych oraz niezbędnych czynników branych pod...
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Wykorzystanie modeli systemu energetycznego statku
PublikacjaPrzedstawiono model generatora synchronicznego oraz węzłów równoległych obciążeń, w których zastosowano wektorową reprezentację zmiennych stanu. Przyjęto założenie o symetrycznym obciążeniu generatora, co umożliwia modelowanie obciążeń tylko dla jednej fazy napięcia. Ze względu na ocenę pojedynczej pracy, jak również analizę stanu jałowego, generator został zbudowany jako źródło napięciowe. Opracowane modele wykorzystano do oceny...
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Zautomatyzowana budowa modeli 3D pomieszczeń
PublikacjaW artykule przedstawiono budowę systemu do automatycznej budowy modeli 3D wnętrz budynków. System taki może być stosowany do tworzenia lokacji w grach komputerowych. Model jest tworzony na bazie kolorowych oraz głębokościowych obrazów pobranych z kamery Microsoft Kinect. Opisano architekturę komponentową systemu, zastosowane sterowniki do komunikacji. Podano zastosowany algorytm sekwencyjny i równoległy, środowisko testowe oraz...
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Identyfikacja ciągłoczasowych modeli obiektów niestacjonarnych
PublikacjaW pracy przedstawiono metody estymacji parametrycznej liniowych modeli obiektów niestacjonarnych. Dynamikę obiektów identyfikacji modelowano za pomocą równań różniczkowych zwyczajnych o znanym rzędzie. Ponieważ klasyczne algorytmy estymacji parametrycznej nadają się do przetwarzania danych rejestrowanych w sposób dyskretny, rozważono i porównano różne techniki dyskretnej aproksymacji modeli z czasem ciągłym. W szczególności zastosowanie...
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Optimal inputs in pharmacokinetics model's identification
PublikacjaW pracy przedstawiono zagadnienie optymalizacji pobudzeń dla identyfikacji parametrycznej kompartmentowych modeli zmiennych stanu SISO systemów farmakokinetycznych. Zaimplementowano kryterium w postaci śladu macierzy informacyjnej Fishera (kryterium czułościowe). Rozważono klasę pobudzeń dopuszczalnych o ograniczonej energii, gdyż w przypadku wielu leków zbyt szybkie ich podawanie wiąże się z występowaniem skutków ubocznych. Zadanie...
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Review of road safety theories and models
PublikacjaW artykule przedstawiono rozwój teorii i modeli stosowanych w badaniach bezpieczeństwa ruchu drogowego oraz wykorzystywanych w zarzadzaniu bezpieczeństwem ruchu drogowego. Wyrózniono cztery grupy najbardziej rozwiniętych teorii: teorie statystyczne, teorie przyczynowe, teorie systemowe i teorie behawioralne. Według tak podzielonych teorii sklasyfikowano modele stosowane w badaniach i analizach bezpieczeństwa ruchu drogowego.
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Modeling external carbon addition in combined N-P activated sludge systems with an extension of the IWA Activated Sludge Models
PublikacjaThe aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to account for a newly defined readily biodegradable substrate that can be consumed by polyphosphate accumulating organisms (PAOs) under anoxic and aerobic conditions, but not under anaerobic conditions. The model change was to add a new substrate component and process terms for its use by PAOs and other heterotrophic bacteria under anoxic and aerobic...
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Elimination of Impulsive Disturbances From Stereo Audio Recordings Using Vector Autoregressive Modeling and Variable-order Kalman Filtering
PublikacjaThis paper presents a new approach to elimination of impulsive disturbances from stereo audio recordings. The proposed solution is based on vector autoregressive modeling of audio signals. Online tracking of signal model parameters is performed using the exponential ly weighted least squares algo- rithm. Detection of noise pulses an d model-based interpolation of the irrevocably distorted sampl es is realized using an adaptive, variable-order...
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Hard and Soft Modeling Tools and Approaches to Data and Information Management in Real-Life Projects and Systems : special issue editorial
PublikacjaOmówiono miękkie oraz twarde narzędzia służące do modelowania i symulacji przepływów dużych ilości danych oraz informacji. Przedstawiono mozliwości zastosowania tego typu narzędzi w funkcjonowaniu systemów rzeczywistych.
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A study on the protection of methionine and the reduction of methionine sulfoxide in methionine-containing analogues of the growth-modeling factor Gly-His-Lys
PublikacjaThe protection of methionine and the reduction of methionine sulfoxide in methionine-containing analogues of Gly-His-Lys are described. The peptides were synthesized by a solid-phase method using the standard Fmoc procedure. Simultaneous deprotection of the peptide side chain and liberation from the resin were achieved using an appropriate TFA cocktail. The TFA cocktail was selected to minimize oxidation of the methionine residue....
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Quantitative structure—retention relationship modeling of the retention behavior of selected antipsychotic drugs in normal-phase thin-layer chromatography
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Numerical Modeling of Hydrogen-Rich Gas Production From Gasoline Autothermal Reforming in a Plug Flow Reactor for Electric Vehicles
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Molecular modeling of Gram-positive bacteria peptidoglycan layer, selected glycopeptide antibiotics and vancomycin derivatives modified with sugar moieties
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Modeling flatness deviation in face milling considering angular movement of the machine tool system components and tool flank wear
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Mechanisms positioned in a neighbourhood of their singular positions - velocity amplification in the electromagnetic damping. Part 1 - Background of the mechanical structure modeling
PublikacjaW pracy przedstawiono metodę modelowania dynamiki drgającego hybrydowego układu mechanicznego złożonego z odkształcalnego podukładu ciągłego oraz z połączonego z nim mechanizmu. U układzie pojawiają się drgania części odkształcalnej. By je wytłumić, ich energia zamieniana jest w energię elektryczną (za pomocą prądnicy prądu stałego) i rozpraszana na oporności obecnej w układzie elektrycznym. Aby przyśpieszyć tłumienie, wprowadzony...
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The role of tungsten in formation of active sites for no SCR on the V-W-O catalyst surface — quantum chemical modeling (DFT)
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Influence of bulky 3,3′-diphenylalanine enantiomers replacing position 2 of AVP analogues on their conformations: NMR and molecular modeling studies
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APPLICATION OF RESPONSE SURFACE MODELING FOR OPTIMIZATION AND DETERMINATION OF MALONDIALDIALDEHYDE BY VORTEX-ASSISTED DISPERSIVE LIQUID-LIQUID MICROEXTRACTION AND GC-FID
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Modeling of soft N, M and L X-ray lines from tungsten relevant to plasma parameters in the WEST tokamak
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Modeling of small molecule's affinity to phospholipids using IAM-HPLC and QSRR approach enhanced by similarity-based machine algorithms
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Hard and Soft Modeling Tools and Approaches to Data and Information Management in Real-Life Projects and Systems : special issue editorial
PublikacjaOmówiono różne metody modelowania w zakresie zarządzania danymi i informacją w złożonych systemach rzeczywistych. Podkreślono szczególnie znaczenie modelowania miękkiego w tym zakresie.
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Safety assessment of ships in damaged conditions by the risk-based method. Assessment of damaged ship performance using the CFD modeling
PublikacjaW pracy przedstawiono aktualny stan badań w zakresie oceny bezpieczeństwa statków w stanie uszkodzonym. Przedstawiono wybrane elementy metody oceny bezpieczeństwa statków w stanie uszkodzonym opartej na analizie ryzyka. Przedstawiono istotę oceny zachowania się statku w stanie uszkodzonym i oceny ryzyka w proponowanej metodzie. Przedstawiono elementy modelowania zachowania się statku w stanie uszkodzonym przy użyciu metody numerycznej...
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The impact of precipitation and external carbon source addition on biological nutrient removal in activated sludge systems - experimentalinvestigation and mathematical modeling
PublikacjaThe aim of this study was to determine the effects of chemical precipitation and addition of external carbonsources on the denitrification capability and enhanced biological phosphorus removal (EBPR) interactions atthe 'Wschod' WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experimentswere carried out with the settled wastewater (without pretreatment and after coagulation-flocculation)and...
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Modeling external carbon addition in combined N-P activated sludge systems with an extension of the IWA Activated Sludge Models
PublikacjaThe aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to account for a newly defined readily biodegradable substrate that can be consumed by polyphosphate accumulating organisms (PAOs) under anoxic and aerobic conditions, but not under anaerobic conditions. The model change was to add a new substrate component and process terms for its use by PAOs and other heterotrophic bacteria under anoxic and aerobic...
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Numerical modeling of PFAS movement through the vadose zone: Influence of plant water uptake and soil organic carbon distribution
PublikacjaIn this study, we investigated the effects of soil organic carbon (SOC) distribution and water uptake by plant roots on PFAS movement in the vadose zone with a deep groundwater table under temperate, humid climate conditions. Two series of numerical simulations were performed with the HYDRUS computer code, representing the leaching of historical PFOS contamination and the infiltration of water contaminated with PFOA, respectively. We...
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Modeling and Strength Calculations of Parts Made Using 3D Printing Technology and Mounted in a Custom-Made Lower Limb Exoskeleton
PublikacjaThis study is focused on the application of 3D-printed elements and conventional elements to create a prototype of a custom-made exoskeleton for lower limb rehabilitation. The 3D-printed elements were produced by using Fused Deposition Modeling technology and acrylonitrile butadiene styrene (ABS) material. The scope of this work involved the design and construction of an exoskeleton, experimental testing of the ABS material and...
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Modeling the impact of discretizing rotor angular position on computation of field-oriented current components in high speed electric drives
PublikacjaModern drives consist of alternating current electric motors, and the field-oriented control (FOC) of such motors enables fast, precise, and robust regulation of a drive's mechanical variables such as torque, speed, and position. The control algorithm, implemented in a microprocessor, requires feedback from motor currents, and the quality of this feedback is essential to a drive's control properties. Motor phase currents are sampled...
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Intramolecular transformation of an antifungal antibiotic nystatin A1 into its isomer, iso-nystatin A1 - structural and molecular modeling studies
PublikacjaNystatin A1, a polyene macrolide antifungal antibiotic, in a slightly basic or acidic solution undergoes an intramolecular transformation, yielding a structural isomer, the translactonization product, iso-nystatin A1 with lactone ring diminished by two carbon atoms. Structural evidence is provided by advanced NMR and Mass Spectrometry (MS) studies. Molecular dynamics simulations and quantum mechanics calculations gave the insight...
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Maximizing the output power of magnetically geared generator in low-speed applications using subdomain modeling and particle swarm optimization
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Prediction of Stress and Deformation Caused by Magnetic Attraction Force in Modulation Elements in a Magnetically Geared Machine Using Subdomain Modeling
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The evaluation of COD fractionation and modeling as a key factor for appropriate optimization and monitoring of modern cost-effective activated sludge systems
PublikacjaA study was conducted to characterize the raw wastewater entering a modern cost effective municipal WWTP in Poland using two approaches; 1) a combination of modeling and carbonaceous oxygen demand (COD) fractionation using respirometric test coupled with model estimation (RTME) and 2) flocculation/filtration COD fractionation method combined with BOD measurements (FF-BOD). It was observed that the particulate fractions of COD obtained...
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Development of Strategies for AOB and NOB Competition Supported by Mathematical Modeling in Terms of Successful Deammonification Implementation for Energy-Efficient WWTPs
PublikacjaNovel technologies such as partial nitritation (PN) and partial denitritation (PDN) could be combined with the anammox-based process in order to alleviate energy input. The former combination, also noted as deammonification, has been intensively studied in a frame of lab and full-scale wastewater treatment in order to optimize operational costs and process efficiency. For the deammonification process, key functional microbes include...
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Three-dimensional modeling and automatic analysis of the human nasal cavity and paranasal sinuses using the computational fluid dynamics method
PublikacjaPurpose The goal of this study was to develop a complete workflow allowing for conducting computational fluid dynam- ics (CFD) simulation of airflow through the upper airways based on computed tomography (CT) and cone-beam computed tomography (CBCT) studies of individual adult patients. Methods This study is based on CT images of 16 patients. Image processing and model generation of the human nasal cavity and paranasal sinuses...
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Recent Advances in Accelerated Multi-Objective Design of High-Frequency Structures using Knowledge-Based Constrained Modeling Approach
PublikacjaDesign automation, including reliable optimization of engineering systems, is of paramount importance for both academia and industry. This includes the design of high-frequency structures (antennas, microwave circuits, integrated photonic components), where the appropriate adjustment of geometry and material parameters is crucial to meet stringent performance requirements dictated by practical applications. Realistic design has...
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Efficient Surrogate Modeling and Design Optimization of Compact Integrated On-Chip Inductors Based on Multi-Fidelity EM Simulation Models
PublikacjaHigh-performance and small-size on-chip inductors play a critical role in contemporary radio-frequency integrated circuits. This work presents a reliable surrogate modeling technique combining low-fidelity EM simulation models, response surface approximations based on kriging interpolation, and space mapping technology. The reported method is useful for the development of broadband and highly accurate data-driven models of integrated...
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Variable‐fidelity modeling of antenna input characteristics using domain confinement and two‐stage Gaussian process regression surrogates
PublikacjaThe major bottleneck of electromagnetic (EM)-driven antenna design is the high CPU cost of massive simulations required by parametric optimization, uncertainty quantification, or robust design procedures. Fast surrogate models may be employed to mitigate this issue to a certain extent. Unfortunately, the curse of dimensionality is a serious limiting factor, hindering the construction of conventional data-driven models valid over...
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Explicit solvent repulsive scaling replica exchange molecular dynamics ( RS‐REMD ) in molecular modeling of protein‐glycosaminoglycan complexes
PublikacjaGlycosaminoglcyans (GAGs), linear anionic periodic polysaccharides, are crucial for many biologically relevant functions in the extracellular matrix. By interacting with proteins GAGs mediate processes such as cancer development, cell proliferation and the onset of neurodegenerative diseases. Despite this eminent importance of GAGs, they still represent a limited focus for the computational community in comparison to other classes...
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Finite element modeling of plastic hinges based on ductility demand-capacity method using nonlinear material for dynamic analysis
PublikacjaThe article discusses modeling plastic hinges in reinforced concrete interme-diate supports using finite elements methods. The ductility demand-capacitymethod was used to determine the geometrical parameters of cross-section plas-ticization zones, their ability to move and rotate, as well as their ductility. Dueto the varied geometry and stiffness of the supports and their nonlinear behav-ior under dynamic load, this method was...
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Modeling of Electrodynamic Phenomena in an Ultra-Rapid Inductive–Dynamic Actuator as Applied to Hybrid Short-Circuit Breakers - A Review Study
PublikacjaThis article is a study of the research development of electrodynamic phenomena occurring in ultra-fast electrodynamic drives. These types of linear drives are among the fastest, not only because of the huge accelerations achieved, but, above all, because of the extremely short reaction time. For this reason, electrodynamic drives are used in hybrid short-circuit breakers. The phenomena occurring in this type of drive are actually...