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Tytuł:
Model of Interaction of Water and Tank’s Structure in Sloshing Phenomenon
Autorzy:
Krata, P.
Powiązania:
https://bibliotekanauki.pl/articles/117117.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Safety and Security in Sea Transportation
Sloshing Phenomenon
Water Tank
Model of Interaction
Experimental Research
Numerical Simulation
Equations of Ship's Movement
Heeling Moment Calculations
Opis:
The paper presents the model of interaction between ship’s tank structure and water contained in the tank. The experimental investigation of sloshing loads in ships’ tank is characterized and the need for description of mutual influence is underlined. The model of interaction is made up for rectangular ship’s tanks and it is assumed to be in time-domain and nonlinear. The solution is based on the data obtained by the experimental research and numerical simulation. The study may be the contribution to more sophisticated estimation of ship’s stability than it takes place nowadays.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 4; 389-395
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model of interaction of milk thistle seed with grooved working surfaces
Autorzy:
Nishchenko, I.
Sukach, O.
Powiązania:
https://bibliotekanauki.pl/articles/410998.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
seeds of milk thistle grooved working surface
area of contact
Opis:
The interaction of milk thistle seed with grooved working surfaces is revealed. The dependences of curvature of the ellipse of contact on the step between grooves and pressure distribution on the area of contact of normal force of compression are identified. The achieved dependences make it possible to justify optimal geometrical parameters of grooved working surfaces required for peeling milk thistle seed coat.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 4; 103-106
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and nonexistence of solutions for a model of gravitational interaction of particles, III
Autorzy:
Biler, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/967095.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
blowing up solutions
parabolic-elliptic system
Źródło:
Colloquium Mathematicum; 1995, 68, 2; 229-239
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and nonexistence of solutions for a model of gravitational interaction of particles, I
Autorzy:
Biler, Piotr
Nadzieja, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/967263.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
nonlinear boundary conditions
stationary solutions
global existence of solutions
parabolic-elliptic system
Opis:
We study the existence of stationary and evolution solutions to a parabolic-elliptic system with natural (no-flux) boundary conditions describing the gravitational interaction of particles.
Źródło:
Colloquium Mathematicum; 1993, 66, 2; 319-334
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and nonexistence of solutions for a model of gravitational interaction of particles, II
Autorzy:
Biler, Piotr
Hilhorst, Danielle
Nadzieja, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/967183.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
nonlinear boundary conditions
blowing-up solutions
global existence of solutions
parabolic-elliptic system
Opis:
We study the existence and nonexistence in the large of radial solutions to a parabolic-elliptic system with natural (no-flux) boundary conditions describing the gravitational interaction of particles. The blow-up of solutions defined in the n-dimensional ball with large initial data is connected with the nonexistence of radial stationary solutions with a large mass.
Źródło:
Colloquium Mathematicum; 1994, 67, 2; 297-308
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Promoting active online interaction with maritime english students
Autorzy:
Kudryavtseva, V.
Barsuk, S.
Frolova, O.
Powiązania:
https://bibliotekanauki.pl/articles/24811505.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime english
model of interaction
active learning
online learning environment
e-books
e-courses
zoom conferencing
students’ self-study
assessment
Opis:
The present paper is aimed at sharing practical experience of organizing active interaction with Maritime English students of remote groups in conditions of permanent online teaching and learning processes. The authors explore various strategies that can be integrated into the design and development of tailored e-books and tutors’ e-courses to foster high level of Maritime English students’ online interaction. In addition, the use of modern digital tools for the successful running of e-books and e-courses is discussed as well as the role these tools play in promoting atmosphere of interaction to allow students be deeply engaged into learning activities and contribute to genuine discussion. A few aspects considered with regard to the process of designing e-books and e-courses are accessibility of learning materials, integration of design elements, and development of students’ online community, encouraging discussions and application of effective assessment methods. The study examines their experience of teaching Maritime English using Moodle and Zoom platforms. The findings of the study can be useful for educators to promote more interactive online learning.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 707--713
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free running ship model tests of interaction between a moored ship and a passing ship
Autorzy:
Raszeja, Magdalena
Hejmlich, Andrzej
Nowicki, Jacek
Jaworski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/24202583.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
interaction forces
safe mooring
fuzzy model
neural network
numerical modelling
bypassing ship
Opis:
For many reasons, ship model interaction tests are performed in experimental towing tanks. This paper presents research on the hydrodynamic forces acting on a ship tied up at the solid berth, which is produced by other ships passing by using free-running ship models with much larger dimensions than those used in towing tanks. A passing ship model was controlled by a human operator – an experienced master. This enabled a study of the influence of the interaction impact on the course of the maneuver. The research was carried out at the Ship Handling Research and Training Centre in Iława. The ship model was moored alongside and equipped with multi-directional force sensors linking the ship model with a solid berth. Forces were measured as a function of the passing ship speed, side distance between both ships, ship sizes, and depth-to-draft ratio (H/T). Forces were measured in two planes: the longitudinal (surge) and the transversal (sway). A numerical database was processed and ordered according to the variables. The fuzzy model was created within a “Matlab” computing environment using a Sugeno-type self-learning neuron network model. The proposed Sugeno model was evaluated with other methods presented by Flory (2002), Seelig (2001), and PASS-MOOR by Wang (1975). The ultimate goal of this study was to simplify the method of predictive calculations for adjusting speed and distance when passing by the moored ship, which ensures compliance with safe port mooring requirements.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 72 (144); 50--56
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of Particle-Particle Interaction for Saltating Grains in Water
Autorzy:
Czernuszenko, W.
Powiązania:
https://bibliotekanauki.pl/articles/241341.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Lagrangian model
saltation
particle motion
dense flow
particle collision
Opis:
A model of particle-particle interaction for bed sediment-laden flows, based on impulse equations, is presented. The model is applicable to dense flows in which particle motion is dominated by collisions. The model takes into account the possibility of sliding during the collision process. However, particle rotation is not considered in this model. The governing equations do not incorporate dimension of angular momentum. To verify this model, calculation of post-collision velocities was performed for several different collision simulations. The term of particle-particle interaction is implemented into a general Lagrangian model of trajectory of a sediment grain in a fluid flow. This general Lagrangian model is written according to Newton's second law; the rate of change of momentum of a particle is balanced against the surface and body forces.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 3-4; 101-120
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Model of SiC Particle Interaction with Solidification Front in AZ91/(SiCp) Composite
Autorzy:
Żak, P. L.
Kalisz, D.
Rączkowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/355818.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AZ91/SiCp composite
solidification front
modeling
Opis:
Presented work focused on the movement of SiC particles in the vicinity of the solidification front in AZ91/(SiC)p composite. Authors describe the mathematical model that governs this phenomenon. On the base of following numerical model own computer program was prepared. The behavior of a particle moving parallel to the solidification front was analyzed. Three variants of local velocity gradient of liquid metallic phase were analyzed for a particle of radius 10, 50 and 100 μm. At a bigger velocity gradient the SiC particle was observed to go down quicker and to move towards the solidification front. This effect was stronger for SiC particles, which had a bigger radius, i.e. 100 and 50 μm.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1625-1628
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovation Potential for the Reindustrialisation of Eastern Siberia (Example of Krasnoyarsk and Irkutsk)
Autorzy:
Rudneva, Vera
Powiązania:
https://bibliotekanauki.pl/articles/439013.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
Eastern Siberia
innovation factor
model of triple helix interaction
potential for reindustrialisation
reindustrialisation
Opis:
The report provides an assessment of the innovation factor in the reindustrialisation of Eastern Siberia, based on data on R&D costs and the introduction of innovative products. The Krasnoyarsk Territory has the greatest innovative potential, followed by the Irkutsk Region. The terms of modernisation of industrial complexes in Krasnoyarsk and Irkutsk were compared on the basis of the triple helix model. This model formalises the interrelation of production with university education and the development of interaction between all parties of the innovation process. The leadership of the Krasnoyarsk Territory was confirmed by a more developed innovation infrastructure of universities that interact with local engineering and aerospace corporations. Industrial production of the Irkutsk oblast is more focused on the extraction of minerals and the production of primary processing goods due to its more eastern position and dependence on the needs of the Chinese market.
Źródło:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2019, 33, 4
2080-1653
Pojawia się w:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model Assessment of Interaction between Banking and Insurance Segments of the Financial Market
Модельная оценка взаимодействия банковского и страхового сегментов финансового рынка
Модельна оцінка взаємодії банківського і страхового сегментів фінансового ринку
Autorzy:
Ivanov, Roman V.
Maksyshko, Nataliia K.
Powiązania:
https://bibliotekanauki.pl/articles/1879864.pdf
Data publikacji:
2021-06-24
Wydawca:
Dnieprowski Uniwersytet Narodowy im. Ołesia Honczara
Tematy:
financial services sector
bank
insurance company
bankinsurance
additive and multiplicative interaction
сектор фінансових послуг
банк
страхова компанія
банкострахування
адитивна та мультиплікативна взаємодія
сектор финансовых услуг
страховая компания
банкострахование
аддитивное и мультипликативное взаимодействие
Opis:
Purpose: To develop a model of interaction between banks and insurance companies, allowing for a joint model assessment from the point of view of the possibility of sustainable operation and development. Findings: The article develops the theory of dynamic systems and a numerical method for solving the problem of assessing the results of interaction between banks and insurance companies based on a system of differential equations. The additive and multiplicative types of interaction are considered. The results of interaction are analyzed for various variants of the influence of the activities of the studied subjects. Practical Implications: The proposed approach is applicable to assess the effectiveness of the used model of interaction between banks and insurance companies. Originality/Value: The author's model of interaction between banks and insurance companies is original. The model has no analogues in the scientific literature of the studied subject area. Research Limitations/Future Research: The study proposes a generalized dynamic model of interaction without specifying the content of variables and the procedure for determining the input parameters. Its description and application determine potential areas for further research. Paper type: Theoretical.
Цель работы: Разработать модель взаимодействия между банками и страховыми компаниями, позволяющую проводить совместную оценку с точки зрения возможности устойчивого функционирования и развития. Результаты исследования: В статье развивается теория динамических систем и на основе системы дифференциальных уравнений разработана методика решения проблемы оценки результатов взаимодействия банков и страховых компаний. Рассмотрены аддитивный и мультипликативный типы взаимодействия. Результаты взаимодействия анализируются при различных вариантах влияния деятельности исследуемых субъектов. Практическое значение исследования: Предложенный подход может быть использован для оценки эффективности используемой модели взаимодействия между банками и страховыми компаниями. Оригинальность / ценность: Авторская модель взаимодействия банков и страховых компаний оригинальна. Модель не имеет аналогов в научной литературе исследуемой предметной области. Ограничения исследований / Перспективы дальнейших исследований: Исследование предлагает обобщенную динамическую модель взаимодействия без указания содержания переменных и процедуры определения входных параметров. Его описание и применение определяют потенциальные направления дальнейших исследований. Тип статьи: Теоретический.
Мета роботи: Розробити модель взаємодії між банками та страховими компаніями, що дозволяє проводити спільну оцінку з точки зору можливості стійкого функціонування та розвитку. Результати дослідження: У статті розвинено теорію динамічних систем та на основі системи диференціальних рівнянь розроблено методику вирішення проблеми оцінки результатів взаємодії банків та страхових компаній. Розглянуто аддитивний та мультиплікативний типи взаємодії. Результати взаємодії аналізуються при різних варіантах впливу діяльності досліджуваних об’єктів. Практичне значення дослідження: Запропонований підхід може бути використаний для оцінки ефективності використаної моделі взаємодії між банками та страховими компаніями. Оригінальність / цінність дослідження: Авторська модель взаємодії банків та страхових компаній оригінальна. Модель не має аналогів у науковій літературі досліджуваної предметної області. Обмеження досліджень / Перспективи подальших досліджень: Дослідження пропонує узагальнену динамічну модель взаємодії без зазначення змісту змінних та процедури визначення вхідних параметрів. Його опис та застосування визначають потенційні напрямки подальших досліджень. Тип статті: Теоретичний.
Źródło:
European Journal of Management Issues; 2021, 29, 2; 101-108
2519-8564
Pojawia się w:
European Journal of Management Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Model of Three-Dimensional Ultrasonic Beam Interaction with an Immersed Plate
Autorzy:
Soucrati, H.
Chitnalah, A.
Aouzale, N.
Jakjoud, H.
Powiązania:
https://bibliotekanauki.pl/articles/177031.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic modeling
immersed plate
Gaussian beams decomposition
Green’s functions
NDUT
Opis:
This paper proposes an analytical model to describe the interaction of a bounded ultrasonic beam with an immersed plate. This model, based on the Gaussian beams decomposition, takes into account multiple reflections into the plate. It allows predicting three-dimensional spatial distributions of both transmitted and reflected fields. Thereby, it makes it easy to calculate the average pressure over the receiver’s area taking into account diffraction losses. So the acoustical parameters of the plate can be determined more accurately. A Green’s function for the interaction of an ultrasonic beam with the plate is derived. The obtained results are compared to those given by the angular spectrum approach. A good agreement is seen showing the validity of the proposed model.
Źródło:
Archives of Acoustics; 2018, 43, 4; 669-679
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of ships moving in opposing directions among ice floes
Autorzy:
Goncharov, V.
Klementieva, N.
Zueva, E.
Powiązania:
https://bibliotekanauki.pl/articles/135677.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
collision
computer simulation
ice floe
maneuvering
mathematical model
navigation
side force
yawing moment
Opis:
During winter in arctic seas, navigation of ships near ports occurs within ice channels created and maintained by icebreakers. Small ice floes fill the relatively narrow navigable channel, and ships are forced to produce the overtaking or opposing separation over short distances and under the action of ice floes. This paper presents an analytical model of the interaction of ships under the conditions just described as well as the results of a simulation. The simulation showed side force and yawing moments were dependent on ice conditions and the ship’s dimensions and motion characteristics.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 91-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model hybrydowy łuku do badania oddziaływania odbiornika plazmowego gliding arc na sieć zasilającą
Hybrid arc model for testing the interaction of the gliding arc plasma receiver on the power supply network
Autorzy:
Sawicki, Antoni
Gryś, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/267707.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
łuk elektryczny
model Woronina
model hybrydowy
electric arc
Voronin model
hybrid model
Opis:
Na podstawie analizy warunków pracy plazmotronu gliding arc zaproponowano zastosowanie zmodyfikowanego modelu Woronina łuku elektrycznego do symulacji procesów w układzie zasilania łuku. Postać hybrydowa modelu umożliwia jego wykorzystanie w szerokim zakresie prądu roboczego. Ponadto model ten uwzględnia dynamikę zmian długości kolumny plazmowej. Przeprowadzone symulacje wykazały efektywność stosowania opracowanego makromodelu oraz umożliwiły zbadanie wpływu plazmotronu na sieć zasilającą w warunkach braku i stosowania różnego rzędu filtrów biernych.
Based on the analysis of the operating conditions of the gliding arc plasmotron, a modified Voronin model of the electric arc was proposed to simulate processes in the arc power supply system. The hybrid form of the model allows its use in a wide range of supply current. In addition, this model takes into account the dynamics of length changes of the arc column. The simulations showed the effectiveness of using the developed macromodel and allowed the study of the impact of the plasmotron on the power supply network under the conditions of using different passive LC filters inserted before transformer. The main conclusions are as follows: higher filter rank increases the device's on-off current and at the same time reduces the start voltage on the filter; the higher the filter rank, the greater the attenuation of voltage changes - the waveform has a milder shape by reducing fighter frequencies. The possible future work can be quantitative analysis of energy quality for results of simulations and real measurements with experimental stand including filter, transformer and gliding plasmotron.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 67; 123-127
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and functional simulation of interaction in the field of aviation safety by using matrices
Autorzy:
Drobakha, Hr.
Neklonskyi, I.
Kateshchenok, A.
Sobyna, V.
Taraduda, D.
Borysova, L.
Lysachenko, I.
Powiązania:
https://bibliotekanauki.pl/articles/378939.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
aviation safety
structural model
functional model
incidence matrix
bezpieczeństwo lotnicze
model strukturalny
model funkcjonalny
macierz częstości
Opis:
Purpose: The conducted research was aimed at constructing a structural and functional model for the interaction of bodies providing aviation safety during crisis management. Design/methodology/approach: The methods of mathematical simulation and the graph theory, the methods comparison and formalization have been applied to study the process of interaction between the bodies assuring aviation safety. Using methods of the linear algebra allowed constructing a mathematical model for the functional structure of the interaction process that contains description of this process by the main methods of interaction. Findings: It has been proved that the interaction process has a certain functional properties that reflect the functional relations between the modes of violator actions, the modes of using the response forces and the modes of interaction. A structural and functional model of interaction in semantic, algebraic forms and in the form of graphs has been created. using typical operations with incidence matrices, the possibility of obtaining the physical interpretation of the simulation results within the introduced algebra of functional structure models has been justified. Research limitations/implications: Discusses interactions between the bodies that assure aviation safety and at the same time, the possibility of a crisis situation is taken into account. Practical implications: The developed models allow reflecting the current state of the functional system and the elements of the process of interaction rather completely. It makes a structural and functional analysis of interaction possible and allows defining the priority directions of its organization, simulating the options and methods of interaction in solving relevant tasks by the bodies that assure aviation safety. Originality/value: That allowed not only describing the formal relations between the methods of interaction and interacting units, between the interacting units and the modes of violator actions, but also considering the influence of the interaction process on the current state of the functional system.
Źródło:
Archives of Materials Science and Engineering; 2019, 95, 2; 67-76
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model działania schładzacza spalin silnika turbinowego w ekstremalnych lotach śmigłowca. Część 1: Identyfikacja współdziałania bezprzeponowego schładzacza spalin z silnikiem turbinowym śmigłowca
performance model of turbine engine exhaust cooler in extreme conditions helicopter flights. Part 1. Identification of membranneless exhaust gas cooler interaction with the helicopter turbine engine
Autorzy:
Fijałkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/213900.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
lotnictwo
śmigłowce
schładzacz spalin silnika turbinowego
silnik turbinowy
loty ekstremalne śmigłowca
aviation
helicopters
model of turbine engine exhaust cooler
extreme conditions helicopter flights
Opis:
W artykule przedstawiono model współdzialania bezprzeponowego, dekcyjnego schładzacza spalin z turbinowym silnikiem śmigłowca w aspekcie obniżania temperatur zmian udziałów CO2 i H20 w mieszaninie spalin i powietrza emitowanej do otoczenia. Tematyka pracy dotyczy zagadnień wynikających z potrzeby obniżenia poziomów emisji podczerwieni do otoczenia przez niektóre rodzaje owców. Nieschładzane gazy spalinowe odpływajace do otoczenia mają znaczący udział w promieniowaniu podczerwonym śmigłowca w locie. Przedmiotem analizy i modelowania jest działanie dobudowanego schładzacza bezprzeponowego, pobierającego samoczynnie powietrze chłodzące otoczenia na zasadzie eżekcji. W wyniku modelowania uzyskuje się podstawy do wstępnego oszacowania parametrów schładzanych spalin, a także wytyczne dla geometrii urządzenia.
The paper presents a model of interaction of membranneless, ejector exhaust cooler with the helicopter turbine engine in terms of lowering the temperature and changes of CO2 and H2O shares in the air and exhaust gas mixture outflowed to the environment. Scope of work addresses issues arising from the need to reduce the levels of infrared emissions into the environment by certain types of helicopters. Noncooled exhaust gases outflowing into the environment form a significant share of infrared radiation in the helicopter flight. The subject of analysis and modeling is performance of added membranneless cooler, ingesting the cooling air from the environment on ejection principle. In the result of modelling process the preliminary estimates of the cooled exhaust parameters are obtained, as well as guidelines for the geometry of the device.
Źródło:
Prace Instytutu Lotnictwa; 2008, 3-4 (194-195); 215-228
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matematicheskaja model kontaktnogo vzaimodejjstvija novogo rabochego organa dlja uborki botvy sakharnojj svekly
Study of interaction semicontact elements of working sinking rotary separator topper
Autorzy:
Bulgakov, W.
Boris, A.
Powiązania:
https://bibliotekanauki.pl/articles/76958.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
mathematical model
rotational motion
separator topper
root
working element
root crop
head
Opis:
На основании проведенных ранее исследований вращательного движения очистительного элемента нового отделителя ботвы и кинематического взаимодействия рабочих элементов между собой построена математическая модель динамического взаимодействия системы рабочих элементов отделителя с головкой корнеплода сахарной свеклы. Получены зависимости усилий в точке контакта системы рабочих элементов с головкой корнеплода в зависимости от количества элементов в системе и режимов работы нового отделителя ботвы. Построены графические зависимости изменения суммарной нормальной реакции системы от количества ее элементов. Значения составляющих нормальной реакции были использованы в дальнейшем для силового анализа указанного взаимодействия.
From the mathematical models of rotational motion of cleaning element of new separator tops on head and root of kinematic interaction between the working elements of a mathematical model of the dynamic interaction between the system elements working with the head of root crop. The obtained dependences of effort at the contact point of the work items to the head of root crops, depending on the number of elements in system and modes of operation of the new trap tops. The constructed image changes depending on the total normal reaction of number of its elements. The values of the components of the normal reaction were used for further analysis of power of this interaction.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical approach to the standard model of water hammer with fluid-structure interaction
Autorzy:
Henclik, S.
Powiązania:
https://bibliotekanauki.pl/articles/281051.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
water hammer
transient pipe flow
fluid-structure interaction
standard model
method of characteristics
Opis:
In the classic water hammer (WH) theory, 1D liquid flow in a quasi-rigid pipe is assumed. When the pipe is flexible or is fixed to the foundation with elastic supports, the dynamic fluid structure interaction (FSI) should be taken into account for more accurate modelling of the system behaviour. The standard model of WH-FSI for a straight pipe reach is governed by fourteen hyperbolic partial differential equations of the first order, two for 1D liquid flow and twelve for 3D motion of the pipe. This model is presented in the paper and an algorithm for its numerical solution based of the method of characteristics is proposed. Basic boundary conditions (BC) are shortly discussed. The important condition at the junction of two subpipes fixed to the foundation with a viscoelastic support is presented in details and a general method of its solution is proposed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 543-555
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants of poverty – binary logit model with interaction terms approach
Autorzy:
Dudek, Hanna
Lisicka, Iga
Powiązania:
https://bibliotekanauki.pl/articles/425268.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
poverty
household
logit model
interactions
Opis:
The problem of monetary aspect of welfare in employees’ household was undertaken in this paper. In order to identify the households in danger of poverty, the binary logit models approach was applied. It was found that the estimation of models without the interaction terms results in misspecification error. Due to this, the interaction terms, between the socio-economic factors of households were included in the model. The obtained results can have significant importance in the aspect of social policy in Poland.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 3(41); 65-77
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy assessment of linear elasticity solution for interaction of cylindrical tank with subsoil
Autorzy:
Lewiński, Paweł Marek
Powiązania:
https://bibliotekanauki.pl/articles/2090694.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RC tank
cylindrical tank
soil-structure interaction
theory of elasticity
Winkler model
zbiornik cylindryczny
zbiornik żelbetowy
interakcja gleba-struktura
teoria sprężystości
model Winklera
Opis:
The subject of this paper is an assessment of the accuracy of a solution based on the linear theory of elasticity describing the interaction of a cylindrical reinforced concrete tank with the subsoil. The subsoil was modelled in the form of an elastic half-space and Winkler springs. The behaviour of the shell structure of the RC cylindrical tank, and particularly of the ground slab interacting with the subsoil, depends largely on the distribution of the reactions on the foundation surface. An analysis of this structure with the shell fixed in a circular ground slab was carried out taking into consideration the elastic half-space model using the Gorbunov-Posadov approach and, for comparison, the two-parameter Winkler model. Although the results for both subsoil models proved to be divergent, the conclusions that follow the accuracy assessment of a solution based on the theory of elasticity are fairly important for engineering practice.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136039, 1--7
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy assessment of linear elasticity solution for interaction of cylindrical tank with subsoil
Autorzy:
Lewiński, Paweł Marek
Powiązania:
https://bibliotekanauki.pl/articles/2173556.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
RC tank
cylindrical tank
soil-structure interaction
theory of elasticity
Winkler model
zbiornik cylindryczny
zbiornik żelbetowy
interakcja gleba-struktura
teoria sprężystości
model Winklera
Opis:
The subject of this paper is an assessment of the accuracy of a solution based on the linear theory of elasticity describing the interaction of a cylindrical reinforced concrete tank with the subsoil. The subsoil was modelled in the form of an elastic half-space and Winkler springs. The behaviour of the shell structure of the RC cylindrical tank, and particularly of the ground slab interacting with the subsoil, depends largely on the distribution of the reactions on the foundation surface. An analysis of this structure with the shell fixed in a circular ground slab was carried out taking into consideration the elastic half-space model using the Gorbunov-Posadov approach and, for comparison, the two-parameter Winkler model. Although the results for both subsoil models proved to be divergent, the conclusions that follow the accuracy assessment of a solution based on the theory of elasticity are fairly important for engineering practice.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136039
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model and numerical computations of transient pipe flows with fluid-structure interaction
Autorzy:
Henclik, S.
Powiązania:
https://bibliotekanauki.pl/articles/175378.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
waterhammer
transient pipe flow
fluid-structure interaction (FSI)
numerical modeling
method of characteristics
Opis:
Transient flows in closed conduits are of interest from over a century, but the dynamic interaction between the fluid and the pipe is taken into consideration more thoroughly just from a few decades. A standard model of the phenomenon consists of fourteen first order partial differential equations (PDE), two for a one-dimensional (1D) liquid flow and twelve for 3D pipe motion. In many practical cases however, a simpler four equations (4E) model can be used, where 1D longitudinal pipe movement is assumed. A short description of waterhammer event with fluidstructure interaction taken into account is presented in the article. The 4E mathematical model is presented in detail with the assumptions and main algorithms of computer program that has been developed. Two phase flow is assumed not to take place, but the friction between the liquid and the pipe wall are taken into consideration. A method of characteristics (MOC) with time marching procedure is employed for finding the solutions, but instead of direct solving the resulting finite difference equations (FDE) the “wave method” is proposed. Some other important elements of the algorithm are presented and selected results of numerical computations as well.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2010, 122; 77-94
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CAD based interaction of wing structures and aerodynamic loads using finite element model and transonic small disturbance model
Autorzy:
Zain, R.
Nurhadi, I.
Hadi, B. H.
Tjatra, W.
Powiązania:
https://bibliotekanauki.pl/articles/243253.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
multidisciplinary design
fluid structure interaction
CAD
transonic small disturbance
FEM
Opis:
A scheme has been developed to be utilized for solving the interaction between wing aerodynamic loads and the flexibility of wing structures under a quasi static assumption. The interaction is implemented through a link between the nodes of finite element model and the grids of transonic small disturbance model. The particular finite element responses, namely translational displacement vectors (TDV), are utilised for reconstructing the deflected wing surfaces. So in each iteration, the updated surfaces are involved as the parent for regenerating the TSD grids. The criteria of the Euclidean norm is applied for evaluating the convergency of aero-structure interaction. Catia-V5, is fully employed to manage three dimensional geometries for developing the model of wing structures, calculating grids and aerodynamic loads, as well as for reconstructing the updated wing surfaces. Numerous functions and objects of Catia are employed by conducting particular accesses via component object models using Microsoft Visual Basic.Net. A case study is excersized to demonstrate the interaction in transonic speed. The results shown that the scheme is very good in the way performing the interaction in quasi static condition. The utilization of TDV for generating the deflected wing surfaces indicates the capability of high fidelity deformations with respect to the complexity of finite element model.
Źródło:
Journal of KONES; 2013, 20, 2; 409-416
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of methods of interaction between elementary filters in multiple model tracking filter in marine radars
Autorzy:
Kazimierski, W.
Powiązania:
https://bibliotekanauki.pl/articles/359032.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
radar target tracking
multiple model filters
manoeuvre detection
Opis:
Radar target tracking on a sea-going ship is a basic source of information about movement of other vessels, influencing directly safety of navigation. The research on improving of tracking methods has led to a new concept of multiple model neural filtration, which is a combination of multiple model approach with the use of artificial neural networks for the needs of estimation of movement vector. One of the key issue during designing of filter id to establish rules of interaction between elementary filters. The paper presents the most popular methods of manoeuvre detection and interaction of elementary filters in the numerical filtration. The modifications of them for the needs of neural tracking are proposed. Additionally, a concept of use of probabilistic neural network for this purpose is described. The idea was checked in the experimental research with the use of simulation. The result of the research confirmed usefulness of using PNN in multiple model filtration, showing however simultaneously the directions of future research in this. The research was financed by Polish National Centre of Science under the research project “Development of radar target tracking methods of floating targets with the use of multiple model neural filtering”.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 81-87
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
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