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Wyświetlanie 1-15 z 45
Tytuł:
Effect of using insert on the flow pressure in cylindrical silo
Autorzy:
Hammadeh, Hala
Askifi, Farzat
Ubysz, Andrzej
Maj, Marek
Zeno, Amjad
Powiązania:
https://bibliotekanauki.pl/articles/178369.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silo model
flow pressure
insert
wall pressure
Opis:
This paper presents an experimental investigation of the discharge flow pressure in the vertical silo and the hopper due to the use of insert (top cone with trunk cone bottom). Using the Insert inside the silos is one of the proposed solutions to avoid the problems of having funnel flow pattern, which has a significant effect on the distribution of flow pressure exerted on the silo wall and the hopper. The experiments were performed on a metal cylinder prototype; corn was used as a granular material, and the wall and hopper pressure distribution was measured by a special pressure transducer. The experiments revealed an important result in the flow pressure due to the change in the location of the insert. The experiments were conducted in Damascus University laboratories.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 4; 177-183
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of progesterone-releasing intravaginal device on reproductive performance of cows with cystic ovarian follicles after puerperium
Autorzy:
Rudowska, M.
Barański, W.
Zduńczyk, S.
Tobolski, D.
Janowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/2087479.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cows
cystic ovarian follicles
progesterone insert
fertility
Źródło:
Polish Journal of Veterinary Sciences; 2019, 3; 489-494
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Mechanical Properties of the Titanium Layer Obtained by the Mold Cavity Preparation Method
Autorzy:
Dulska, A.
Szajnar, J.
Król, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049618.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modular insert
titanium layer
cast iron
SLM
Opis:
The article presents the technology of layered casting with the use of 3D printing to make a frame insert. The insert was made of powdered titanium and then filled with liquid cast iron. The paper presents the results of research, including structure observation and hardness measurements, as well as abrasion resistance tests. The results indicate the possibility of creating a local reinforcement using a frame insert. The resulting casting is characterized by a local increase in hardness and, in addition, an increase in abrasion resistance of the entire surface layer. The quality of the obtained connection depends strongly on the casting parameters.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 51-56
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regresyjna analiza zmian jakości mieszanki ziarnistej w czasie mieszania metodą przesypu
Regression analysis of quality changes in granular blend during mixing using the pouring method
Autorzy:
Matuszek, D.
Tukiendorf, M.
Powiązania:
https://bibliotekanauki.pl/articles/290921.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
mieszanie
materiał ziarnisty
system Roof Shaped Insert
regresja nieliniowa
mixing
granular material
Roof Shaped Insert system
nonlinear regression
Opis:
W pracy zaprezentowano efekty stosowania dodatkowych elementów wspomagających mieszanie komponentów ziarnistych na drodze kolejnych przesypów ze zbiornika do zbiornika oraz pokazano przykład modelowania zmian jakości w czasie. Zmienną zależną była wariancja rozkładu trasera, natomiast zmienną niezależną kolejne kroki mieszania: przesypy od 1 do 10. Zależność jednowymiarową stanowił wzór funkcji wielomianowej 3 stopnia. Modelowanie przeprowadzono przy użyciu modułu komputerowego "regresja nieliniowa" (pakiet STATISTICA). Uzyskany wzór zależności jednowymiarowej dobrze opisywał tylko niektóre z badanych przypadków. Pozwolił natomiast na zrozumienie zależności między zmiennymi.
The paper presents the effects of using additional elements supporting mixing of grainy components by successive pouring from container to container and an example of modelling quality changes in time. The tracer distribution variance was the dependent variable, whereas successive steps of mixing (pouring from 1 to 10) constituted the independent variable. The formula of a third degree polynomial function was a one-dimensional dependence. Modelling was carried out using the "non-linear regression" computer module (the STATISTICA set). The obtained formula of onedimensional dependence described well only some of the examined cases. However, it helped to understand the relation between variables.
Źródło:
Inżynieria Rolnicza; 2008, R. 12, nr 6(104), 6(104); 135-143
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loads on walls and inserts in a mass-flow silos
Autorzy:
Ding, S.
Wójcik, M.
Jecmenica, M.
Silva de, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/1955779.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
silo flow/loads
insert
Lagrangian-Eulerian
adaptive
fillet
Opis:
A finite element analysis has been carried out to investigate flow patterns and loads on silos either with a ralatively steep hopper, or with a shallow hopper but in the presence of an insert. A Lagrangian-Eulerian approach was first adopted to simulate the material flow pattern, with the precondition that mass flow was obtained. It was then attempted to predict the loads exerted by granular materials on the walls of such silos. The load on the insert was also simulated. Techniques such as the adoption of adaptive meshes and filleting along sharp corners were applied in the analysis to overcome the difficulties usually encountered with large deformations in the FEM and the mathematic singularity presented by the abruptness of geometry. Filleting proved to be necessary to bring down the pressure peak at the transition level. The insert took over a significant part of the loads. Comparison with the classic theories have confirmed that the loads predicted on the wall agree quite well with the theoretical results in the silo's cylinder section, but that differences exist in the hopper section; the difference is greater when the hopper is shallower. It has also shown the limitations of predicting flow patterns of granular materials with the traditional elastic-plastic model; a more advanced model is needed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 525-538
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of flow patterns in silos with a cellular automaton: Part 1
Autorzy:
Kozicki, J.
Tejchman, J.
Powiązania:
https://bibliotekanauki.pl/articles/1965146.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska
Tematy:
cellular automation
granular flow
flow pattern
insert
silo
Opis:
A simplified cellular automaton was used to calculate the kinematics of non-cohesive granular materials during confined flow in silos. In this model, granular flow was assumed to be an upward propagation of holes through a lattice composed of cells representing single particles. Calculations were carried out with different silo shapes and inserts, transition probabilities, migration rules, outflow schemes, grid types, wall roughness and cell numbers. To visualize the calculation process, horizontal layers of various shades were introduced. The simulation results were compared with laboratory tests in model silos.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 1; 81-102
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Szczegóły tworzenia wióra przy toczeniu wykończeniwoym stopu aluminium EN AW-2017A
Features of the chip formation during finish turning of EN AW-2017A aluminum alloy
Autorzy:
Feldshtein, E.
Gabryś, P.
Grezer, K.
Lisovskaya, Y.
Powiązania:
https://bibliotekanauki.pl/articles/404585.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo AWART
Tematy:
aluminium
cutting insert
chip formation
powstawanie wióra
korozja aluminium
Opis:
The chip formation and removal during turning aluminum alloys is difficult problem. Very often a long or matted chips are formed that are wound on the tool or workpiece and may cause their damage. The improvement chip formation condition is particularly important for alloys with a low content of alloying elements. During finish turning of EN AW-2017A aluminum alloy it was found that in order to form the chip as small particles it is necessary to operate with feeds that are maximum possible in terms of the machined surface roughness. The use of coatings on cutting inserts that have a low shear strength, or coatings containing aluminum compounds, does not provide improved chip formation conditions.
Właściwości aluminium takie jak niska masa właściwa, duża wytrzymałość, odporność na korozję oraz podatność na obróbkę sprawiają, że surowiec ten jest niezwykle popularny wśród producentów przemysłowych. Jego wytworzenie od podstaw wymaga jednak znacznych nakładów energii, co nie pozostaje bez wpływu na środowisko. Na szczęście istnieją rozwiązania szybsze, tańsze, a przede wszystkim bardziej ekologiczne.
Źródło:
Obróbka Metalu; 2016, 4; 30-33
2081-7002
Pojawia się w:
Obróbka Metalu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania zużycia wstawek hamulcowych pojazdów szynowych
Research on rail vehicle brake insert wear
Autorzy:
Piec, P.
Urbańczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/188876.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
zużycie
wstawka hamulcowa
pojazd szynowy
wear
brake insert
rail vehicle
Opis:
Praca dotyczy problemu zużycia wstawek hamulca klockowego pojazdów szynowych. Zamieszczone wyniki badań stanowią podstawę do oceny rodzaju i intensywności zużycia materiału wstawek hamulcowych. Praca zawiera wybrane wyniki z badań laboratoryjnych, stanowiskowych i eksploatacyjnych. Wyniki tych badań stanowią podstawę oceny zużycia wstawek hamulcowych wykonanych z wytypowanych materiałów. Intensywność zużycia decyduje o okresie trwałości wstawek. Wartość drogi hamowania stanowi podstawę wdrożenia do eksploatacji wstawek hamulcowych wykonanych z określonego materiału.
The problem discussed in the paper is rail vehicle brake shoe insert wear. The research results are a basis for the assessment of type and intensity of the wear of brake insert material. The paper includes some results of laboratory, test stand and operation tests. Based on the test results, the wear of the brake insert from certain materials has been assessed. Wear intensity determined insert life. Braking distance values give a basis for implementing, in operation, brake inserts made from certain materials.
Źródło:
Tribologia; 2010, 5; 143-152
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on operational characteristics of tyres with run flat insert
Autorzy:
Motrycz, G.
Stryjek, P.
Jackowski, J.
Wieczorek, M.
Ejsmont, J.
Ronowski, G.
Sobieszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/246776.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
vehicles
VFI
run flat
military
tyres
run flat insert
Opis:
The paper describes results of research on heavy vehicle tyre with Run Flat VFI insert. The experiment has included the determination of heat generation, rolling resistance, and radial stiffness of two different tyre designs (textile and steel carcass). The results have been used for the purpose of evaluation of tyre operating characteristics. The study included research on non-inflated tyre properties. The purpose of the paper is to determine characteristics of the tyres equipped with inserts, which are essential for driving wheeled APCs. The inserts are composed of polymer rings mounted on the rims inside the tyres. If the inflation pressure of the tyre is very low or if there is no inflation pressure at all, the ring transfers the loads imposed on the tyre to the rim. Usually in such a case, there is a contact of the ring and inner surface of the tyre tread area. Laboratory facility for surveys of heavy vehicles tyres, summary characteristics of radial stiffness and hysteresis of test tyres, temperature distribution on the external surface of the test tyre, comparison of radial characteristics of the tyres tested, example of stiffness characteristics, distribution of temperature on the side of tyre during the road test and carcass damages on the flat tyre are presented in the paper.
Źródło:
Journal of KONES; 2012, 19, 3; 319-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The researches on the tribological properties of elements of the seat insert-valve-valve guide assembly
Autorzy:
Siczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/247690.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:
The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:
Journal of KONES; 2010, 17, 4; 423-430
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of the seat insert - valve - guide assembly for valve driven magnetoelectrically
Autorzy:
Siczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/247681.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
valve timing
seat insert
valve guide
magnetoelectrical drive
Opis:
The researches have been carried out, where the object has been the set of two friction couples: valve stem - valve guide and valve seat - seat insert. The camless driven valve has been common for each of such cases. The analyzed valve has been driven by magnetoelectrical drive. The speciał research stand has been elaborated and its scheme has been presented in the article. It has been measured the valve lift and valve acceleration, the impact force, the friction force, temperature values for valve guide and for seat insert, sound level during impacting on the stand. The aim of researches has been to determine the dynamic parameters, the friction force between valve stem and valve guide, the impact force for valve impacting seat insert vs. frequency and valve lift. The analyzed valves have mated with seat inserts and valve guides made of cast iron, in oil absence. The valves have been made of TiAl6Zr4Sn2Mo2 alloy. The researched friction couples have operated in temperature equal 293 K. The increase of frequency has resulted in small changes for values of lift and in greater changes of acceleration, during valve impact into its seat insert. The greatest values of impact force and acceleration have been for the small, middle and high values of valve lift, either. The ratio of impact force and valve acceleration has changed in thin bands. The friction force has decreased slightly with frequency increase and has decreased with valve lift increase. The sound level has increased with the frequency increase, and has not been dependent upon valve lift.
Źródło:
Journal of KONES; 2010, 17, 4; 439-445
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The simulation researches on the wear for elements of the seat insert-valve-valve guide assembly
Autorzy:
Siczek, K.
Kuchar, M.
Powiązania:
https://bibliotekanauki.pl/articles/247694.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:
The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:
Journal of KONES; 2010, 17, 4; 431-438
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modeling of Wall Pressure in Silo with and Without Insert
Autorzy:
Askif, Frzat
Hammadeh, Hala
Ubysz, Andrzej
Maj, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1845157.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
numerical modeling
silo
silo model
flow pressure
insert
wall pressure
Opis:
This paper presents a methodology based on the finite element method to simulate the flow of granular materials. Moreover, it allows proper estimation of dynamic pressure during silo discharge since this subject is still under discussion, especially for designing silos with an insert (an input element). A 2-D simulation of the discharge process of a cylindrical silo with cone and a central discharging orifice was performed. Two cases were studied, with and without using insert in silo. Numerical analysis was carried out with the help of the uncoupled arbitrary Lagrangian–Eulerian (ALE) approach. The resulting dynamic pressure distribution on the silo wall for each of the two cases was inferred numerically. The resulting values of pressure were compared with the results of the experimental study on a cylindrical metal silo to demonstrate the accuracy of the numerical model in determining the dynamic wall pressure, especially in the case of using an insert in silo during discharge.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 1; 22-33
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza zastosowania wkładek daszkowych w mieszaniu komponentów ziarnistych
Analysis regarding the use of roof shaped inserts for mixing of granular components
Autorzy:
Matuszek, D.
Tukiendorf, M.
Doležal, P.
Powiązania:
https://bibliotekanauki.pl/articles/289112.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
materiał ziarnisty
system Roof Shaped Insert
system funnel-flow
analiza wariancji
mixing granular material
Roof Shaped Insert system
funnel flow system
analysis of variance
Opis:
W pracy przedstawiono wyniki mieszania dwuskładnikowego niejednorodnego układu ziarnistego metodą przesypu (ang. funnel flow system) Mieszalnik laboratoryjny został wyposażony we wkładki daszkowe systemu Roof Shaped Insert. Wykonano cztery serie badań, trzy z wkładkami RSI o różnych średnicach podstawy oraz jedną kontrolną (bez elementów wspomagających). Do oceny rozmieszczenia składników ziarnistych posłużono się komputerową analizą obrazu. Na podstawie danych dotyczących udziału procentowego trasera na powierzchni analizowanych przekrojów poprzecznych obliczano stopień zmieszania Rose'a. Następnie wykonując analizę wariancji Anova określono wpływ zastosowanych wkładek.
The paper presents results of mixing a two-component heterogeneous granular pattern using the funnel flow system method. Laboratory mixer was equipped with inserts of the Roof Shaped Insert system. Four test series were performed: three with the RSI inserts with varying base diameters and one check series (without supportive elements). Computer image analysis was employed to assess the layout of granular components. Data concerning percent share of tracer on the surface of analysed cross-sections allowed to compute Rose's mixing degree. Then, the researchers carried out analysis of variance (ANOVA) in order to determine the effect of employed inserts.
Źródło:
Inżynieria Rolnicza; 2009, R. 13, nr 1, 1; 189-197
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wymiarów nasion na proces mieszania w mieszalniku przesypowym z zastosowaniem dodatkowych elementów wspomagających
The impact of seed dimensions on mixing process carried out in a flow mixer, using additional supportive elements
Autorzy:
Matuszek, D.
Tukiendorf, M.
Powiązania:
https://bibliotekanauki.pl/articles/291915.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
materiał ziarnisty
stopień zmieszania
system Roof Shaped Insert
mieszanie
metoda funnel-flow
granular material
mixing degree
Roof Shaped Insert system
mixing
funnel-flow method
Opis:
W pracy przedstawiono wyniki mieszania składników wyka i łubin. Wykonano serie badań dla układu gdzie wyka była składnikiem kluczowym oraz serie gdzie traserem był łubin. Mieszanie prowadzono przy użyciu mieszalnika przesypowego zaopatrzonego w elementy systemu Roof Shaped Insert o różnych średnicach podstawy stożka. Do oceny jakości uzyskiwanych mieszanek wykorzystano komputerową analizę obrazu oraz metodę wagową. Uzyskane wyniki pozwoliły na obserwację przebiegu procesu z zastosowaniem i bez stosowania wkładek daszkowych.
The paper presents the results of mixing vetch and lupine components. Series of tests were performed for the arrangement, in which vetch was a key component, and for series with lupine as the main component. The mixing was carried out using a flow mixer equipped with the Roof Shaped Insert system elements with different cone base diameters. Computer image analysis and gravimetric method were used to assess final mixtures quality. Obtained results allowed to observe the course of the process when using roof- shaped inserts and without them.
Źródło:
Inżynieria Rolnicza; 2007, R. 11, nr 8 (96), 8 (96); 171-177
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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