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1

Wyznaczanie dużych ugięć płaskich struktur tekstylnych z wykorzystaniem energii potencjalnej układu

Szablewski Piotr

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2024

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nr 1

28--33

PL

Głównym tematem artykułu jest wykorzystanie metody energetycznej do rozwiązywania równań różniczkowych ciężkiej elastyki. Metoda ta może być z powodzeniem zastosowana do modelowania dużych ugięć, takich obiektów jak np. płaski pas tkaniny lub liniowy wyrób włókienniczy. Analiza problemu opiera się na zasadzie minimalizacji energii potencjalnej układu. Występujące w pracy zależności na energię potencjalną i energię zginania zostały podane w postaci ogólnej. Do minimalizacji energii potencjalnej wykorzystano rachunek wariacyjny. Wyniki uzyskane podczas analizy można wykorzystać np. do symulacji swobodnego układania tekstyliów płaskich, jak również zginania struktur liniowych.

EN

The main topic of the article is the use of the energy method to solve differential equations describing heavy elastica. This method can be successfully used to model large deflections such objects as a flat strip of fabric or a linear textile product. The analysis of the problem is based on the principle of minimizing the potential energy of the system. The relationships for potential energy and bending energy occurring in this work are given in general form. The calculus of variations was used to minimize the potential energy. The results obtained during the analysis can be used, for example, to simulate the free folding of flat textiles as well as the bending of linear textile structures.

2

Energy, economic and environmental feasibility of energy recovery from wastewater treatment plants in mountainous areas: a case study of Gharyan city – Libya

Awad Hilmy, Nassar Yasser F., Elzer Rahma S., Mangir Ibrahim, El-Khozondar Hala J., Khaleel Mohamed, Ahmed Abdussalam, Alsharif Abdulgader, Salem Mansour, Hafez Ahmad

Acta Innovations

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2023

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no. 50

46--56

EN

Wastewater treatment facilities at high places can give chances for renewable and sustainable energy generation by putting hydroelectric turbines at the input and drain channels of wastewater treatment plants, and they can also use the sludge generated during the treatment process to make biogas, which can be used to generate power. Purified water is subsequently used to irrigate decorative plants along highways, in gardens, and in woods. The fermentation wastes are utilized as organic fertilizer to improve agricultural soil quality. At the Gharyan sewage station, a hybrid system consisting of a hydroelectric station and an electric generator powered by biogas is proposed in this research. This is because the city is distinguished by its high location, which is approximately 713 m above sea level. The results showed that the proposed system would provide an electric power of 490 kW, which is sufficient to cover 87.5% of the electrical energy consumption of the station. The amount of treated water is approximately 13,000 m3/day, and the amount of organic fertilizer is about 17 tons/day. The investment value is anticipated to be around $1,478,000, while the cost of producing a unit of electric energy is expected to be 2.83 ¢/kWh. This system's yearly net profit is predicted to be $307,765. The capital's recovery period is anticipated to be 3.44 years. The planned hybrid system will limit the discharge of an estimated 1,886 tons of CO2 gas each year.

3

Investigating the Potential of Steam Hydro Capacitor – Prototype

Alsaqoor Sameh, Sarayreh Hussein M., Andruszkiewicz Artur, Borowski Gabriel, Alahmer Ali, Abu-Zaid M.

Ecological Engineering & Environmental Technology

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2022

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Vol. 23, iss. 6

275--282

EN

Recently, hydropower energy resources become an attractive means of generating electricity for, off-grid networks, especially in rural areas. This work aims to design a suitable prototype of an energy-storing system, which is called a Potential Steam Hydro Capacitor. This system gives a manageable source of electricity, and partially provides drinkable water, at a low cost, as an alternative to comparatively high-cost electrical batteries. The system is composed of two solar collectors, connected in series. The working fluid in the first collector is Dead Sea water, and in the second fresh water, a heat exchanger, a thermosiphon solar water heater connected to a high column to pass the vapor to high altitude, and a condensation unit on the roof of the building. The system succeeds in producing a considerable amount of fresh water at a height of 3.4 m. The potential energy produced, can operate a small turbine. The capability of the system, to convert thermal energy in the freshwater, to potential energy, was high, with an efficiency of 66.7%. adding solar concentrators to the system would increase the water collected.

4

Investigation to the influence of additional magnets positions on four-magnet bi-stable piezoelectric energy harvester

Li Xinxin, Huang Kexue, Li Zhilin, Xiang Jiangshu, Huang Zhenfeng, Mao Hanling, Cao Yadong

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e140151

EN

To enhance the harvesting performance of a bi-stable piezoelectric energy harvester (BEH), this work proposes a four-magnet BEH (FBEH). FBEH consists of a piezoelectric cantilever beam with a tip magnet, a fixed magnet and two movable magnets. The two movable magnets relative to the fixed magnet can move in both horizontal and vertical directions. A nonlinear distributed parameter model of FBEH is derived through the Hamilton principle. The effects of the excitation frequency and amplitude as well as the horizontal and vertical gap on the harvesting performance are mainly investigated by using the bifurcation diagram, phase diagram, Poincaré map and output power. Numerical simulations demonstrate that the proposed FBEH decreases the potential barrier and creates a higher than typical bi-stable one when subjected to lower excitation amplitudes and frequencies.

5

Influence of viscous-elastic properties of a cylindrical sealing element on its sealing ability

Abbasov Elkhan, Rustamova Kaklik, Darishova Aynur

Journal of Theoretical and Applied Mechanics

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2021

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Vol. 59 nr 3

481--492

EN

The stress-strain state of a sealing element in the form of a hollow cylinder is defined with regard to viscous-elastic properties of its material. Based on linear laws of heredity, an analytical formula allowing one to determine the axial load necessary for tightness of the surface of the sealing element and the cylinder wall depending on its physic-mechanical properties and geometrical dimensions is found. Influence of viscous-elastic properties of the material of the sealing element on its sealing ability is realized based on the hypothesis of elastic analogy. The results of numerical calculations are represented in the form of graphs of the external force necessary for achieving sightless. It is shown that viscous-elastic properties of the sealer material greatly influence its sealing ability. Because of heredity of the sealer material, values of the external forces drop in some cases by about five times.

6

Moment krytyczny stalowych belek dwuteowych o zbieżnym przekroju

Kuś J.

Inżynieria i Budownictwo

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2017

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R. 73, nr 9

468--470

PL

Zaproponowano sposób wyznaczania momentu krytycznego zwichrzenia bisymetrycznej stalowej belki o zbieżnym przekroju poprzecznym na długości. Do wyznaczenia obciążenia krytycznego zastosowano metodę Ritza. Obliczenia wykonano przy różnych parametrach zbieżności pasów i środnika belki obciążonej momentami skupionymi na końcach. Wyniki zaprezentowano w formie graficznej.

EN

A procedure for critical buckling moment of a bisymmetrical tapered beam is proposed. To compute critical buckling loads Ritz method was used. In particular, critical buckling moments of beams under positive gradient moments with different taper parameters for flanges and the web are considered. Detailed, numerical, parametric analyses are carried out in graphical form.

7

Linear magnitudes estimated via expense of incompletely defined potential energy were likely overestimated by over 3.48 %

Czajko J.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 13, iss. 1

32-41

EN

Since former definition of work done by any radial/center-bound (central) force field (and consequently thus also of the corresponding to it expense of potential energy of the field) was incompletely defined (so that these two basic notions were valid only for purely radial phenomena), some indirect estimations of those linear magnitudes that relied on the former (incomplete yet always presumed as total) potential energy may have been overestimated. New, operationally complete and thus mathematically lawful definition of total rate of work done by the field implies presence of a certain (experimentally observed but formerly quite unanticipated and thus routinely unaccounted for) nonradial angular contribution to the total potential energy. Hence some previous calculations of those linear magnitudes, which were indirectly estimated via expense of potential energy spent on the work done, may have been quite inadvertently overrated by over 3.48 %. This was because the extra potential energy that is spent on twisting the path that is deflected by the source of the field was disregarded in the former, incomplete definition of work done, even though such nonradial twisting is generally required by proven Frenet-Serret formulas of differential geometry. This present assessment is based upon purely mathematical premises, but similar prior nonradial angular formula utilized here has already retrodicted the 10.56 % excess over Einstein‟s prediction of deflection of light that was observed in several unbiased experiments, and it has reconciled some other experiments that could neither be explained nor reconciled by general theory of relativity, which, as radial by design, does not account for nonradial or mixed phenomena.

8

Galilei was wrong: Angular nonradial effects of radial gravity depend on density of matter

Czajko J.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 11, iss. 2

89-105

EN

Although in mathematical sense the actual meaning of Galilei‟s experiments conducted at leaning tower of Pisa is that he failed to detect any measurable impact of composition of matter on gravitating bodies, the obvious failure is mistakenly interpreted as experimental confirmation of lack of the impact instead. Galilei did not really perform internal validity checks of his experiments, because he did not ensure that he actually measured what he was supposed to measure. However, a modern experiment devised to test the impact of large mass on gravitational phenomena has revealed presence of (formerly unanticipated) extraneous frequency decrease in rays coming from Taurus A, when they passed close to our Sun (i.e. near occultation). The experiment has effectively confirmed that density of matter of the mass source of locally dominant gravitational field (which was our Sun‟s field) affects gravitational interactions happening on equipotential surfaces surrounding gravity center of the field. Also very similar experiment involving radio waves, which too exhibited (formerly unexpected) frequency decrease when they traveled along practically equipotential surface of Earth, has reaffirmed that conclusion. Hence contrary to Galilei, effects of nonradial (i.e. tangential and/or binormal) components of radial gravitational force fields depend (inversely) on (equipotential exposure to) the, assumed as practically constant and uniformly distributed, density of matter of the mass source of the local field.

9

Innowacyjne wykorzystanie energii słupa wody

Starzomska M., Piotrowski J. Z., Szewczyk S.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2012

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z. 59, nr 2/II/II

725--732

PL

W referacie przedstawiono urządzenie pozwalające na skuteczne pozyskiwanie energii z niewielkich cieków wodnych, w których nieopłacalne lub niemożliwe jest zastosowanie typowych turbin wodnych. Przedstawiono ideę działania urządzenia. Porównano wielkość uzyskanej energii dla tradycyjnego sposobu pozyskiwania energii z wody (przy użyciu turbin wodnych) i przy wykorzystaniu zaproponowanego urządzenia.

EN

This article presents a device which allows to extract energy from the streams where it is impossible or uneconomical to use conventional water turbines. Traditional way of obtaining energy from a water courses (using a water turbine) was compared witch a method which involves our device. The paper also shows the concept of the device.

10

Energy analyses in initiation and propagation of outbursts of coal and gas

Xue S., Yuan L.

AGH Journal of Mining and Geoengineering

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2012

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Vol. 36, no. 3

435-441

EN

The initiation and propagation of outbursts of coal and gas can be considered to be an energy conversion process, i.e. the release and dissipation of the potential energy contained in coal and gas. The release of potential energy may be due to strain energy of coal, expansion of free pore gas, and desorption of gas from coal; while the energy dissipation or conversion may take the forms of coal fragmentation and coal movement. This paper analyses the release and dissipation of the potential energy to gain a better understanding and estimate of outburst risk and intensity.

PL

Inicjacja i propagacja wyrzutów węgla i gazu może być postrzegana jako proces przemiany energii, tzn. uwolnienie i rozpraszanie potencjalnej energii zawartej w węglu i gazie. Uwolnienie potencjalnej energii może być wynikiem energii odkształceniowej węgla, rozszerzenia wolnych gazów porowych oraz desorpcji gazu z węgla; natomiast rozpraszanie energii lub jej przemiana może obrać formę fragmentacji węgla lub przemieszczania się węgla. Niniejsza publikacja analizuje uwalnianie i rozpraszanie energii potencjalnej dla lepszego zrozumienia i oceny ryzyka i intensywności wybuchu.

11

The search for minimum potential energy structures of small atomic clusters. Application of the ant colony algorithm.

Raczyński P., Gburski Z.

Materials Science Poland

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2005

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Vol. 23, No. 3

599--606

EN

The ant colony algorithm has been applied to the problem of finding the minimal potential energy configuration of a small physical system (cluster) of atoms interacting via the Lennard-Jones phenomenological potential. The ants were positively motivated if their activity (displacement of atomic positions) leads to a lower total potential energy of the system. Starting from a random spatial distribution of atoms, during the optimalization process, the ants were able to find configurations with energies much lower than the initial ones. The optimized configurations generated by the ant colony algorithm can be used as a good starting point for classical or ab initio molecular dynamics (MD) simulations.

12

Concept of recrystallization modelling based on the potential energy hypersurface.

Kaczmarek J.

Rudy i Metale Nieżelazne

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2000

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R. 45, nr 4

244-250

EN

In this paper a model of recrystallization is introduced. The model is based on the potential energy hypersurface. The concept of the presented approach consists of development of a notional system which would be helpful in describing more fine properties of this phenomenon. In particular, introduced notions related to the potential energy hypersurface allow the modelling the recrystallization from complex structures of defects and dislocations. Structures of this kind are present within shear bands. Complicated picture of the dynamical recrystallization gives premises for presented in this paper discrete-continuum way of modelling of mentioned phenomena. Discrete part of this description is aimed to determine criteria for detection of nuclei of recrystallization and conditions for growing. The case of recrystallization by coalescence of grains is also discussed.

PL

W niniejszym opracowaniu wprowadzono model rekrystalizacji oparty na potencjalnej energii superpowierzchni. Przedstawione podejście składa się z systemu pojęciowego pomocnego w opisie subtelniejszych własności tego zjawiska. Wprowadzone pojęcia, pokrewne potencjalnej energii superpowierzchni, pozwalają zwłaszcza na modelowanie rekrystalizacji ze złożonych struktur defektów i dyslokacji. Struktury tego rodzaju są obecne wewnątrz pasm ścinania. Złożony obraz dynamicznej rekrystalizacji daje przesłanki do przedstawionej w tym opracowaniu, drogi nieciągłego continuum modelowania wzmiankowanych zjawisk. Nieciągła część tego opisu zmierza do określenia kryteriów dla wykrycia zarodków rekrystalizacji i warunków wzrostu. Wzięto także pod uwagę możliwość rekrystalizacji przez koalescencję krystalitów.

13

Multiple elliptical-Gaussian-Density annealing as a tool for finding the most stable structures. Application to Lennard-Jones atomic clusters

Pillardy J., Piela L.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 7S

1849-1857

14

Method of the analysis of variations in the dynamical system potential energy aiming at the stability analysis of characteristic points

Szumiński P., Kapitaniak T.

Mechanics and Mechanical Engineering

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1998

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Vol. 2, nr 2

233--246

EN

A method of the stability analysis of critical points of dynamical systems, based on equations of the so-called potential energy of perturbations, has been proposed. This method has been called the method of potential energy perturbation analysis. Its essence consists in formulation of relations and an analysis of changes in the potential energy of a perturbation of any number of generalised coordinates of the dynamical system. An example of the application of this method to analyse the stability in vicinities of characteristic points of a sample dynamical system in the form of a robot manipulator has been also shown.