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Wyświetlanie 1-15 z 74
Tytuł:
Statistical validation of the method for measuring radius variations of components on the machine tool
Autorzy:
Adamczak, S.
Janusiewicz, A.
Makieła, W.
Stępień, K.
Powiązania:
https://bibliotekanauki.pl/articles/221018.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roundness
experimental method error
process tool
Opis:
This paper deals with the experimental validation of the suitability of the method for measuring radial variations of components on the process tool. The tests were conducted using a computerized PSA6, which was compared to a Talyrond 73. The results of measurement of roundness deviations as well as roundness profiles were analyzed for a sample of 70 shafts. The roundness deviations were assessed by determining the experimental errors, while the profiles obtained with the tested device were compared to those registered by the reference device using three correlation coefficients.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 35-46
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basic set of experiments for determination of mechanical properties of sand
Autorzy:
Sawicki, A.
Mierczyński, J.
Świdziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/202447.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
granular soils
mechanical properties
experimental determination
Opis:
A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 129-137
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental investigation conducted in order to determine bearing dynamic coefficients of two hydrodynamic bearings using impulse responses
Autorzy:
Breńkacz, Ł.
Żywica, G.
Powiązania:
https://bibliotekanauki.pl/articles/175435.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrodynamic bearings
bearing dynamic coefficients
experimental study
Opis:
The paper presents the experimental investigation carried out in order to identify bearing dynamic coefficients of two hydrodynamic bearings from impulse responses. In this method the stiffness, damping and mass coefficients of two hydrodynamic bearings were calculated in a single algorithm. For each rotational speed, were obtained 12 dynamic coefficients which enable to fully describe the dynamic state of the rotor. Exciting force signals, applied using an impact hammer were shown. Displacements of the shaft were measured by eddy current sensors. The measurements were carried out at various rotational speeds, including resonance speeds. The vibration amplitude in a resonance case increases significantly with time after the excitation was induced by an impact hammer. Excitations of the rotor with an impact hammer were recorded using a high-speed camera. These unique recordings and simultaneous analysis of the trajectory of the bearing journals depict the contact phenomena that occur during impulse excitation of the rotor.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 39-54
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in aerodynamic parameters for 5-stage steam turbine during warming and gradual start-up to nominal operating parameters
Autorzy:
Hoznedl, M.
Bednář, L.
Tajč, L.
Powiązania:
https://bibliotekanauki.pl/articles/175267.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steam turbine
experimental measurement
warming
start-up
efficiency
Opis:
The results of experiments on the 5-stage steam turbine are presented. The parameters of individual stages as well as the whole turbine are observed during the gradual start-up to nominal operating parameters. The pressures and temperatures are shown at stages in idling, heating up the experimental turbine and during the transition to operating speed. A greater attention is devoted to three selected operational conditions with different processed enthalpy drops. Problems with efficiency and enthalpy drops measurement during warming are described. The attempts to measure flow parameters quickly and without time for heating of turbine casings and other parts are often in the experimental research caused byprice of the survey. This contributionÞs task is to inform about these situations and to avoid confused and untrue results obtained by somewhat hasty measurements due to reduction and optimisation of costs.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 45-62
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental allogenic transplantation of cornea endothelial cells in cats
Autorzy:
Kielbowicz, Z.
Kuryszko, J.
Strzadala, L.
Powiązania:
https://bibliotekanauki.pl/articles/31702.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
experimental transplantation
transplantation
cornea
endothelial cell
cat
endothelium
Opis:
Background: The aim of the present study was assessing the possibility of experimental allogenic transplantation of cat cornea endothelial cells, multiplied in vitro, into the anterior chamber of the eyeball in recipient cats. The reason for undertaking the research is the need to develop a method that would help in the cornea treatment in animals with corneal opacification following cataract surgery, as well as lens dislocation, injuries and endothelium degeneration. Methods: Cats aged 10-12 months were used in the experiment. Cornea fragments consisting of the posterior limiting membrane and posterior epithelium were placed in Iscove;s medium with addition of 10% foetal calf serum. Multiplied in vitro cells were injected into the anterior chamber of recipient cats. The cornea was subject to histological, histometric and SEM examination on the 3rd, 7th, 20th and 30th day after the surgery. Results: Micromorphological examination of the cornea showed full restitution of its endothelium 30 days after transplantation. Complete regeneration of structures indispensable for normal functioning of the posterior epithelium occurred as a result of implantation. Conclusions: In this study the results show that implantation of the cells of posterior corneal epithelium of donor cats, multiplied into vitro and injected into the anterior chamber of recipient cats. The cornea regained its full function, the layer of the posterior epithelium was regenerated and the stroma stabilized, presenting the image of full and proper corneal translucency.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constant rate infusion of tramadol in isoflurane-anesthetized pigs undergoing experimental surgery
Autorzy:
Catone, G.
Meligrana, M.
Marino, G.
Vullo, C.
Powiązania:
https://bibliotekanauki.pl/articles/2087253.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analgesia
constant rate infusion
pig
tramadol
experimental surgery
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 4; 589-593
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granice eksperymentu w makro- i mikrosocjologii
THE LIMITS OF EXPERIMENT IN MACRO- AND MICROSOCIOLOGY
Autorzy:
Sulek, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/427791.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EXPERIMENT
NATURAL SCIENCES
NON-EXPERIMENTAL RESEARCH
SOCIAL SCIENCE
Opis:
One of the frequently discussed features of sociology are its modest possibilities - compared with natural sciences and, even, psychology - of conducting experimental research. Hence the supposition that sociology encounters in the sphere of experiment certain obstacles which are either unknown to those sciences or not met by them in such in such a form and intensity. The aim of this paper is to depict those barriers to experimenting on individuals and social systems. Three main barriers - technical, social-psychological, and axiological are indentified and analyzed.
Źródło:
Studia Socjologiczne; 2011, 1(200); 139-156
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of experimental manipulation of body schema on creative potential in mid-adolescence
Autorzy:
Mirucka, Beata
Kisielewska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2128996.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
body schema
creative potential
mid-Adolescence
experimental manipulation
Opis:
The study explored the impact of experimental manipulation of body schema on creative potential in mid-adolescence. The experiment was conducted in a group of 140 adolescents at the age of 14-16: 68 boys (M = 15.03; SD = .93) and 72 girls (M = 15.01; SD = .81), randomly allocated to equinumerous groups: experimental and control. The aim of experimental manipulation was to obtain a temporarily disturbance of body schema. It was gained by the use of glasses reversing the field of vision in the vertical up/down plane, and measured by the Body Schema Disturbance Questionnaire. In both groups the Urban and Jellen’s Test for Creative Thinking – Drawing Production (TCT-DP, Urban & Jellen, 1986) was administered twice (in A and B versions, randomly selected). Statistical analyses was run with a mixed model ANOVA (2 drawings x 2 groups x 2 sexes). The interaction effect of drawing production and group assignment on creative potential was significant, while the interaction effect of drawing production and sex on creative potential turned out to be insignificant.
Źródło:
Polish Psychological Bulletin; 2020, 51, 4; 295-304
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static axial crush performance of unfilled and elastomer-filled composite tubes
Autorzy:
Ochelski, S.
Bogusz, P.
Kiczko, A.
Powiązania:
https://bibliotekanauki.pl/articles/200998.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
absorbed energy
polymer composites
elastomers
experimental mechanics
Opis:
The paper presents the results of the experimental static axial crush performance of unfilled and filled composite tubes. Composites are widely used as materials for energy absorbing structures because of their low density and a very high absorbed energy in relation to the mass ratio. Foamed materials are used in order to additionally increase their efficiency, because of stabilizing the progressive crush. It was proved by many authors that various foamed materials positively influence the energy absorption. In this work authors took effort to evaluate a very different material as a filler of common composite elements . elastomers. Elastomers are materials characterised by very high crush strains and viscoelastic properties. The tube shaped specimens made of epoxy composite, reinforced with carbon or glass fabrics were filled with elastomers of 40; 60; 70 and 90. ShA hardnesses. The influence of the elastomer hardness and the filling degree on the energy absorption factor (EA) was evaluated. The degree of filling the specimens with elastomers is determined by a different size of the elastomer perforation. Elastomers have a negative impact on the energy absorbed by the composite tubes.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 37-43
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field test and numerical studies of the scissors-AVLB type bridge
Autorzy:
Krason, W.
Malachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/201143.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
scissor-AVLB type bridge
experimental test
numerical FE analysis
Opis:
Scissor bridges are characterized by high mobility and modular structure. A single module-span consists of two spanning parts of the bridge; two main trucks and the support structure. Pin joints are used between modules of the single bridge span. Some aspects of the experimental test and numerical analysis of the scissor-AVLB type bridge operation are presented in this paper. Numerical analyses, presented here, were carried out for the scissors-type BLG bridge with treadways extended as compared to the classical bridge operated up to the present in the Armed Forces of the Republic of Poland. A structural modification of this kind considerably affects any changes in the effort of the force transmitting structure of the bridge. These changes may prove to be disadvantageous to the whole structure because of torsional moments that additionally load the treadways. Giving careful consideration to such operational instances has been highly appreciated because of the possibility of using this kind of bridges while organizing the crossing for vehicles featured with various wheel/track spaces (different from those used previously). The BLG bridge was numerically analysed to assess displacements and distributions of stresses throughout the bridge structure in different loading modes. Because of the complexity of the structure in question and simplifications assumed at the stage of constructing geometric and discrete models, the deformable 3D model of the scissors-type bridge needs verification. Verification of the reliability of models was performed by comparing deflections obtained in the different load modes that corresponded with tests performed on the test stand. It has been shown that the examined changes in conditions of loading the treadways of the bridge are of the greatest effect to the effort of the area of the joint which is attached to the girder bottom. Stress concentrations determined in the analysis are not hazardous to safe operation of the structure.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 103-112
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of a two stages electrostatic air precipitation process using response surface modeling
Autorzy:
Berrached, D.
Tilmatine, A.
Miloua, F.
Bengrit, M.
Powiązania:
https://bibliotekanauki.pl/articles/141038.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-stage ESP
design of experiments
experimental modelling
electrostatic precipitator
Opis:
Any industrial process needs to work with the optimal operating conditions and thus the evaluation of their robustness is a critical issue. A modeling of a laboratoryscale wire-to-plane two stages electrostatic precipitator for guiding the identification of the set point, is presented this in paper. The procedure consists of formulating recommendations regarding the choice of optimal values for electrostatic precipitation. A twostages laboratory precipitator was used to carry out the experiments, with samples of wood particles of average granulometric size 10 μm. The parameters considered in the present study are the negative applied high voltage of the ionization stage, the positive voltage of the collection stage and the air speed. First, three “one-factor-at-a-time” experiments were performed followed by a factorial composite design experiments, based on a two-step strategy: 1) identify the domain of variation of the variables; 2) set point identification and optimization of the process.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 609-619
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static axial crush performance of unfilled and foamed-filled composite tubes
Autorzy:
Ochelski, S.
Bogusz, P.
Kiczko, A.
Powiązania:
https://bibliotekanauki.pl/articles/201001.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
absorbed energy
polymer composites
foamed materials
experimental mechanics
Opis:
The use and the combination of new, high efficient materials for crashworthiness is of great interest nowadays. Foamed materials are commonly used to increase efficiency of composite materials. Based on the results obtained by Brachos and Douglas, it can be concluded that the sum of the energy absorption capabilities of the foamed filling and unfilled composite tubes is smaller than the energy absorbed by the tubes filled with the same filling. The paper presents the results of the experimental investigations into the influence of filling the tubes with different materials on the impact energy absorption capability. The tube shaped specimens made of epoxy composite, reinforced with carbon or glass fabrics were filled with foamed aluminium or foamed poly(vinyl chloride). It was proved that the foamed materials increase the energy absorption and the absorbed energy of the tubes filled with foams is greater than the sum of the energy absorbed by the composite tube without filling and the foamed material itself investigated separately, when the wall thickness is more than 2 mm. The investigations of the filled tubes with the thickness of walls equal to 1 mm showed lower absorbed energy values because the crushing force had decreased during the crush. The investigations were executed to show what are the effects of filling composite energy absorbing elements in the shape of tubes with foamed materials. Additionally, influence of tube wall thickness and crush mechanism were studied.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 31-35
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis on unsteady characteristics of sheet/cloud cavitating Venturi flow under the effect of dissolved air
Autorzy:
Malekshah, Emad Hasani
Wróblewski, Włodzimierz
Bochon, Krzysztof
Majkut, Mirosław
Rusin, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2134932.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cavitating flow
venturi nozzle
dissolved air
unsteady characteristic
experimental observation
Opis:
The highly dynamic and unsteady characteristics of the cavitating flow cause many negative effects such as erosion, noise and vibration. Also, in the real application, it is inevitable to neglect the dissolved air in the water, although it is usually neglected in the previous works to reduce the complexity. The novelty of the present work is analysing the impact of dissolved air on the average/unsteady characteristics of Venturi flow by conducting sets of experimental tests. For this purpose, two different amounts of dissolved air at five pressure levels (i.e. five different sets of cavitation numbers) were considered in the study of cavitating flow inside a Venturi nozzle. The fast Fourier transform analysis of pressure fluctuations proved that the shedding frequency reduces almost by 50% to 66%, depending on the case, with adding the amount of dissolved air. However, the reduction of 14% to 25% is achieved by the vibration transducers. On the other hand, the cavity enlarges as well as bubbly flow is observed in the test chamber at a higher level of dissolved air. Furthermore, it is observed that the re-entrant jet, as the main reason for the cavity detachment, is more effective for the detachment process in cases with a lower level of dissolved air, where the re-entrant jet front penetrates more toward the leading edge.
Źródło:
Archives of Thermodynamics; 2022, 43, 3; 63--84
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of flexibility of a steel adjustable foundation chock
Analiza odkształcalności stalowej nastawnej podkładki fundamentowej
Autorzy:
Grudziński, P.
Konowalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/175788.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
podkładka fundamentowa
odkształcenie
badania doświadczalne
foundation chock
deformation
experimental study
Opis:
The paper presents a description and results of a flexibility study of a steel adjustable foundation chock (VibraconŽ SM). Chocks of this type are used in so-called rigid seatings (mountings) on foundations of heavy machinery and equipment, which require precise alignment and adjustment. They are an alternative to conventional (ordinary) metal chocks or new generation chocks - which are ready-cast with specifically for this purpose developed polymer composites. Experimental studies were conducted in laboratory conditions on an original new chock. The characteristics of deformation for this chock were determined in conditions close to the operation conditions of such chocks. The results show that in the investigated system there are significant deformations of a non-linear-elastic character. They allow one to better understand and explain many complex phenomena occurring in real structural connections with such type of chocks. They also constitute an experimental basis for appropriate modeling and analysis of strength and vibrations occurring in such systems.
W pracy przedstawiono analizę wyników badań podatności na odkształcenia sprężyste stalowej nastawnej podkładki fundamentowej (VibraconŽSM). Podkładki stosowane są w posadowieniach, na fundamentach maszyn i urządzeń o dużej masie, wymagających dokładnego ustawienia i regulacji - osiowania. Stanowią alternatywę dla tradycyjnie stosowanych podkładek metalowych albo podkładek nowej generacji - wytwarzanych z kompozytów polimerowych. Badania doświadczalne prowadzono w warunkach laboratoryjnych z użyciem nowej podkładki. Wyznaczono charakterystyki odkształceń w warunkach zbliżonych do eksploatacji. Stwierdzono występowanie w badanym układzie dużego odkształcenia o charakterze nieliniowo-sprężystym. Przeprowadzona analiza wyników badań umożliwiła charakteryzację złożonych zjawisk występujących w rzeczywistych połączeniach konstrukcyjnych z użyciem tych podkładek. Stanowią również doświadczalną podstawę do procesu modelowania oraz analizy wytrzymałości i drgań, występujących w układach mechanicznych.
Źródło:
Advances in Manufacturing Science and Technology; 2012, 36, 2; 79-90
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Split Hopkinson Pressure Bar impulse experimental measurement with numerical validation
Autorzy:
Baranowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/221627.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Split-Hopkinson Pressure Bar
impulse measurement
experimental testing
numerical studies
Opis:
Materials and their development process are highly dependent on proper experimental testing under wide range of loading within which high-strain rate conditions play a very significant role. For such dynamic loading Split Hopkinson Pressure Bar (SHPB) is widely used for investigating the dynamic behavior of various materials. The presented paper is focused on the SHPB impulse measurement process using experimental and numerical methods. One of the main problems occurring during tests are oscillations recorded by the strain gauges which adversely affect results. Thus, it is desired to obtain the peak shape in the incident bar of SHPB as “smooth” as possible without any distortions. Such impulse characteristics can be achieved using several shaping techniques, e.g. by placing a special shaper between two bars, which in fact was performed by the authors experimentally and subsequently was validated using computational methods.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 47-58
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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