Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "pipe" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 174
Tytuł:
The Choice of Initial Conditions and of Solution in the Problem of Efficiency Increase of Pipes Calibration on a Mandrel
Autorzy:
Salikhyanov, D.
Bogatov, A.
Dyja, H.
Powiązania:
https://bibliotekanauki.pl/articles/352003.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot-rolled pipe
pipe calibration on a mandrel
pipe precision index
extrafocal deformation
finite element simulation
FEM
Opis:
This research work is devoted to the theoretical study of the pipe calibration on a mandrel. The aim of the study is to improve the precision of the calibrated pipes. As the paper shows, it is advisable to apply different methods of research depending on the purpose of the study of metal forming processes: mathematical, computer or physical simulation. Analytical review of existing mathematical models of the pipes calibration on a mandrel showed that the set of assumptions adopted in the mathematical modeling does not allow assessing the precision of the pipes during calibration. Therefore, finite-element method simulation package was used for this research. Research method and pipes precision index were developed on the basis of the computer simulation using Deform-3D package. The investigations have allowed us to get the dependence of the pipe precision on technological factors and to identify the root cause of reduced efficiency calibration – extrafocal deformation.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 739-742
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of resistances of natural liquid flow in helical and curved pipes
Autorzy:
Stosiak, M.
Zawiślak, M.
Nishta, B.
Powiązania:
https://bibliotekanauki.pl/articles/258608.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
flow
resistance of flow
helical pipe
curved pipe
natural liquid
laminar flow
Opis:
The main aim of this research was to determine in three ways, i.e. experimentally, analytically and by means of numerical modelling, the resistances of the flow of a natural liquid in a helical pipe and in curved pipes. The analyses were carried out for three pipes: one helical pipe and two curved pipes. Each of the pipes was 2 m long and its inside diameter was 4 mm. The experiment was carried out on a test stand making it possible to measure the rate of the flow of the liquid, the temperature at the pipe’s inlet and outlet and the pressure at the pipe’s inlet and outlet. The resistances of the flow of the liquid were calculated from analytical or empirical formulas found in the literature on the subject. Moreover, numerical modelling was performed using the finite volume element method.
Źródło:
Polish Maritime Research; 2018, 3; 123-130
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data assimilation approach for estimating strength of steel pipes reinforced with composite sleeves under unsteady pressure-flow conditions
Autorzy:
Witek, Maciej
Uilhoorn, Ferdinand
Powiązania:
https://bibliotekanauki.pl/articles/1845453.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pipe wall metal loss
composite sleeve
pipe fracture
gas dynamics
data assimilation
Opis:
The aim of this paper is twofold: to estimate the unsteady pressure-flow variations in gas transmission pipelines using the ensemblebased data assimilation approach and to analyse the strength of steel tubes reinforced with composite sleeves containing localized part-wall thickness loss caused by corrosion while taking into consideration a safe operating pressure of the pipeline. For a steel thin-walled cylinder containing a partwall metal loss, a flexible wrap of fibreglass as well as carbon glass with epoxy resin are determined. The strength of the repaired pipeline with two kinds of materials for sleeves is investigated taking into consideration the internal pressure at the defect location. For the case study, a section of the Yamal transit pipeline on the Polish territory is selected. The results enable pipeline operators to evaluate the strength of corroded steel pipelines and develop optimal repair activities, which are of vital importance for the maintenance and operation of underground steel networks.
Źródło:
Archives of Thermodynamics; 2020, 41, 4; 3-22
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data assimilation approach for estimating strength of steel pipes reinforced with composite sleeves under unsteady pressure-flow conditions
Autorzy:
Witek, Maciej
Uilhoorn, Ferdinand
Powiązania:
https://bibliotekanauki.pl/articles/1845456.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pipe wall metal loss
composite sleeve
pipe fracture
gas dynamics
data assimilation
Opis:
The aim of this paper is twofold: to estimate the unsteady pressure-flow variations in gas transmission pipelines using the ensemblebased data assimilation approach and to analyse the strength of steel tubes reinforced with composite sleeves containing localized part-wall thickness loss caused by corrosion while taking into consideration a safe operating pressure of the pipeline. For a steel thin-walled cylinder containing a partwall metal loss, a flexible wrap of fibreglass as well as carbon glass with epoxy resin are determined. The strength of the repaired pipeline with two kinds of materials for sleeves is investigated taking into consideration the internal pressure at the defect location. For the case study, a section of the Yamal transit pipeline on the Polish territory is selected. The results enable pipeline operators to evaluate the strength of corroded steel pipelines and develop optimal repair activities, which are of vital importance for the maintenance and operation of underground steel networks.
Źródło:
Archives of Thermodynamics; 2020, 41, 4; 3-22
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic transients analysis in pipe networks by the method of characteristics (MOC)
Autorzy:
Wichowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/240954.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
hydraulic transients
method of characteristics
single pipe
experimental measurement
pipe networks
numerical simulations
Opis:
The paper presents results of an experimental and theoretical study of the hydraulic transients in straight pipes and numerical simulations of unsteady flow in pipe networks. A mathematical model consists of a set of partial differential equations of hyperbolic type, which have been transformed by the method of characteristics into ordinary differential equations which are solved by the predictor-corrector method. Experimental tests have been performed, in order to examine the hydraulic transients phenomenon, in a single straight steel pipe. The experiments were carried out in the hydraulic laboratory of the Institute of Water Supply and Water Engineering, Environmental Engineering Faculty, Warsaw University of Technology. The numerical results show that the presented one dimensional model for a single pipe correctly describes the phenomenon since there is a good agreement with experimental maximum and minimum oscillations. In the paper, selected exemplary equations in a difference form for the pipe networks are also presented. One calculation example is given relating to the complex water-pipe network consisting of 17 loops, 48 pipelines and 33 nodes, supplied by two independent sources. Water-hammer throughout the whole pipeline network was caused by closing the gate valve at mid-point of one selected pipe. The results of the numerical calculations are presented in graphic form with respect to the final cross-sections of pipes.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 3; 267-291
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problem of placing the organ pipes on the windchest
Autorzy:
Węgrzyn, Damian
Wrzeciono, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/128020.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
pipe organ
windchest
organ pipe distance
organy piszczałkowe
wiatrownica
odległość między piszczałkami organowymi
Opis:
This paper presents research showing the problem occurring in the construction of a pipe organ, related to the placement of the organ pipes on the windchest. The close location of the organ pipes to each other influences the parameters of the sound generated by the pipes. It causes an intonation problem, namely the detuning of the organ pipes if they are located too close to each other on the windchest. The presented measurements show the influence of a distance between pipes of various types on basic sound parameters, such as frequency or volume level. The research carried out shows that in extreme cases the detuning reaches a temperate halftone. This has undoubtedly an impact on the tuning of organ pipes, especially in the case of a table organ or pipe organ built in a small space. In the future, the outcomes of the presented research can be applied in the windchest design.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of bedding and backfill soil type on deformation of buried sewage pipeline
Autorzy:
Grosel, S.
Pachnicz, M.
Różański, A.
Sobótka, M.
Stefaniuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/178571.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
numerical analysis
buried PE pipe
Opis:
In the paper, the influence of different types of bedding and backfill soil surrounding underground sewage duct on its deformation was analysed. Impact of increased soil lateral pressure was examined by considering the construction of an embankment nearby the underground pipeline. Numerical computations of three different variants of bedding and backfill soil surrounding the pipe were carried out. Displacements and deformation of the pipe were calculated using the finite element method with adoption of elastic-perfectly plastic constitutive model of soil. Subsequent stages of the construction were taken into account. Shear strength reduction method was applied to evaluate the factor of safety of the entire system. Finally, the results and conclusions were depicted.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 4; 313-320
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The choice of motor : transmission installation for the pipe layer
Autorzy:
Shevchyuk, V. P.
Shekhovtsov, V. V.
Krivosheev, N. V.
Powiązania:
https://bibliotekanauki.pl/articles/241544.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
motor – transmission installation
pipe layer
Opis:
The results of research, which applied character, for an industrial complex, will allow resolving topical and important issues of increase of efficiency of operation of park of special equipment in the course of a production activity, at stages of a project and preparatory work are given in article. In previous articles [1, 2, 3, 4, 5] proposed mathematical model of determination of productivity of the machine -tractor unit (MTU) with industrial function is presented in article during the pipelaying works. The mathematical model coordinates all key technical parameters of the pipelayer and the parameters defining service conditions in uniform dependence. The method of "minimization of duration of a running cycle of the machine" is put in mathematical model, as duration of a running cycle is one of generalizing indicators of technical and operational efficiency of MTU. In other words, productivity of the pipelayer is in inverse relationship with a duration of a running cycle, the less time is spent for pipeline laying, the productivity and efficiency of construction is higher. Various ways of laying of the pipeline define boundary conditions, which form some private models.
Źródło:
Journal of KONES; 2015, 22, 1; 285-288
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of construction of a catalytic reactor for methane oxidising in ventilation air in coal mines and the research on integrated “heat pipe” recuperator
Autorzy:
Hys, L.
Powiązania:
https://bibliotekanauki.pl/articles/124448.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heat pipe
recuperator
catalytic reactor
Opis:
The article presents the analysis whose result is the selection of appropriate design and construction of a monolithic CMR reactor intended for oxidising methane from ventilation air in coal mines. The description of “heat-pipe” recuperator cooperating with the reactor was also presented. The research was mainly aimed at verifying the compliance with the work of autothermity premise obtained by the return of part of heat from catalytic reaction. The result of research was to define the range volumetric fume expense ensuring autothermity and the definition of maximum recuperator efficiency. The range of volumetric expense was 18–25 m3/h and maximum value of efficiency coefficient was η = 0.50 for the volumetric expense of 18 m3/h.
Źródło:
Journal of Ecological Engineering; 2013, 14, 2; 31-35
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the manufacturing conditions and operating position on heat transport ability of the heat pipe filled with Fluorinert FC-72
Autorzy:
Čaja, A.
Nemec, P.
Mančikova, V.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402136.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
heat pipe
heat transport
cooling
Opis:
Heat pipes are devices, which transfer heat at a minimum temperature difference between evaporating and condensing phase. Operating temperature of heat pipe is determined by the working fluid and vacuum achieved during its production. This paper is focused on the determining the effect of the initial temperature of the ambient air to the performance characteristics of produced heat pipes. In general, the decrease in pressure decreases the boiling liquid. Based on this it can be presumed that achieving a lower temperature during production of heat pipe, the lower vacuum, the boiling point of working fluid while increasing ability of heat transport in various positions.
Źródło:
Structure and Environment; 2014, 6, 2; 44-47
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of technological parameters on the course of acidic hydrolysis of starch
Wpływ parametrów technologicznych na przebieg kwasowej hydrolizy skrobi
Autorzy:
Kosicki, Z.
Jarosławski, L.
Zielonka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1396399.pdf
Data publikacji:
1985
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
starch
enzymatic hydrolysis
pipe reactor
Opis:
The effect of technological parameters on the course of enzymatic hydrolysis of starch was investigated. The studies were performed in industrial c.onditions using a specially equipped continuous pipe reactor of a hydrolysate production capacity corresponding to the production of 50-70 t of syrup per day. The obtained results are presented graphically in the Figs.
Przeprowadzono badania wpływu parametrów technologicznych na przebieg procesu kwasowej hydrolizy skrobi. Badania hydrolizy skrobi prowadzono w warunkach przemysłowych, wykorzystując do tego celu specjalnie oprzyrządowany ciągły reaktor rurowy o zdolności produkcyjnej hydrolizatu odpowiadającej produkcji syropu 50-70-t/d. Pomiary stopnia scukrzenia przeprowadzono w obszarze zmian następujących parametrów technologicznych: - czasu reakcji (od 1 do 20 min), - temperatury reakcji (od 129 do 151 °C), - zakwaszenia (kwasem solnym) pH od 1,45 do 2,3 przy założonym stałym stężeniu mleczka krochmalowego ok. 38% s.s. Uzyskane dane przedstawiono na wykresach. Analiza krzywych pozwoliła dobrać optymalne parametry hydrolizy do produkcji poszczególnych gatunków syropów z uwzględnieniem ich jakości.
Źródło:
Acta Alimentaria Polonica; 1985, 11, 1; 89-95
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern concrete pipes: a review of reinforcement and new technologies
Autorzy:
Abel, Tomasz
Pelczar, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2037701.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
concrete pipe
underground structure
fibre
reinforcement
Opis:
The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, s1; 548-557
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a calculation fem model of the test static set-up of pipe conveyor for analysis of contact forces
Autorzy:
Fedorko, G.
Molnár, V.
Powiązania:
https://bibliotekanauki.pl/articles/102281.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pipe conveyor
simulation
analysis
contact forces
Opis:
Experimental research in the field of pipe conveyors is a difficult matter and yet necessary in order to answer the questions regarding the motion resistances and contact resistances of pipe conveyors, loading of the conveyor belts etc. These research activities can be performed not only during the actual operation of pipe conveyors, but also by means of the special laboratory test set-ups combined with the application of the computational simulation models. The main task of this paper is to assess the creation of a suitable simulation model of the test set-up for a specified pipe conveyor developed with regard to realisation of the FEM analyses, using the software product Abaqus, as well as presentation of its application possibilities.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 2; 220-225
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic analysis of leakage from submarine pipe network
Autorzy:
Li, J. H.
Fan, Y. T.
Powiązania:
https://bibliotekanauki.pl/articles/258776.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
submarine pipe network
leakage
transient flow
Opis:
The leakage from submarine pipe network is investigated by a numerical model in this paper. A whole event including of the steady flow before the leakage, the transient flow during the leakage and the steady flow after the leakage is considered in the model. The numerical results of the discharge and the head compare with the theoretical solution under the condition of steady flow. Good agreement is obtained. The numerical results of the discharge and the head show that the discharge and the head in each pipe changes suddenly after the leakage occurring. The abrupt trend of the discharge in each pipe is not same completely. Some change upwards, while others downwards. However, the abrupt trend of the head is always downward. The effects of leakage discharge on the transient flow are also investigated. It is founded that the larger the leakage discharge, the more obvious the abrupt trend of the discharge and the head before or after the leakage is.
Źródło:
Polish Maritime Research; 2015, S 1; 48-55
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural optimization on the design of an automobile engine intake pipe
Autorzy:
Xie, Jianxin
Liu, Zimeng
Powiązania:
https://bibliotekanauki.pl/articles/2104764.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
engine
intake pipe
Fluent
optimization design
Opis:
The engine intake pipe is an important part of the engine. A reasonable layout of the intake pipe can prolong service life of the engine and improve engine power. The optimization of design of the intake pipe has a great impact on the overall performance of the engine. The design of the intake pipe based on experience is subjective and unilateral, and the design cycle and experimental period are long. Ansys Fluent software is used to simulate the design, which can more intuitively reflect the air flow condition of the intake pipe and enable selection of the best layout. First of all, a three-dimensional model of the intake pipe is simulated and the airflow characteristics are studied and analyzed. The streamline diagram and velocity contour under various conditions are obtained. Then, compared with the simulation results, the position of the intake pipe is optimized. Finally, the optimized intake pipe is simulated and verified. According to the experimental results, the intake performance of the optimized intake pipe is greatly improved.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 449--461
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 174

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies