Temat: geometrical analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Geometrical and optical analysis of small-sized parabolic trough collector using ray tracing tool SolTrace
Autorzy:: Singh, Raman Kumar
Chandra, Prakash
Powiązania:: https://bibliotekanauki.pl/articles/27312206.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: parabolic trough collector
SolTrace
Monte Carlo ray tracing method
nonuniform heat flux distribution
optical analysis
geometrical analysis
Opis:: The present work is aimed at geometrical optimization and optical analysis of a small-sized parabolic trough collector (PTC). Improving the performance of parabolic trough collectors can greatly justify the use of solar energy. An optimized curvature geometry, the location of the absorber tube, and the heat flux distribution along the circumference of the absorber tube are major features in the geometric optimization and optical modelling of parabolic trough collectors. Rim angle, aperture width, the diameter of the absorber tube, receiver position, and the optimum value of heat flux are the major parameters considered in this work for geometrical and optical analysis. The Monte Carlo ray tracing method has been adopted for analysis. The non-uniform heat flux distribution profile obtained from optical analysis of the proposed parabolic trough collector has been compared with the profile available in the literature, and good agreement has been obtained, which proves the feasibility and reliability of the model and method used for this study. An experimental new small-sized parabolic trough collector has been fabricated for the optimized rim angle of 90 deg after a successful laser light feasibility test. The effect of the absorber tube position along the optical axis on the heat flux profile was analysed and found to be substantial. Furthermore, the sensitivity analysis of the parabolic trough collector using the software applied has been discussed separately.
Źródło:: Archives of Thermodynamics; 2023, 44, 3; 35--61
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Numerical strength analysis of a complex, steel shell structure
Numeryczna analiza wytrzymałościowa pewnej złożonej, stalowej konstrukcji powłokowej
Autorzy:: Burczyński, G.
Marcinowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/395945.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: steel structure
shell structure
tubular members
linear elastic static analysis
geometrical analysis
nonlinear analysis
stalowa konstrukcja powłokowa
elementy rurowe
wzmacnianie konstrukcji
liniowa analiza statyczna
analiza wytrzymałościowa
analiza geometryczna
Opis:: The paper deals with the numerical modelling of a complex, steel shell structure. The part under analysis is the upper segment of a steel pylon, which consists of several cylindrical shells and one conical segment. Particular parts of the structure are welded together. Geometrical and loading data calculations were performed for the particular material for both an ideally elastic case and an elasto-plastic case. The conclusion that the structural member analysed required strengthening were drawn on the basis of these results. The structural modification was proposed and additional calculations for this modified structure were also performed. Introduced additional shell elements locked the mechanism of plastic flow. The proposed modification can be treated as a possible strengthening concept. The whole analysis was performed by means of the ABAQUS system but some stages of calculations were also verified by the COSMOS/M system.
Przedmiotem pracy jest numeryczne modelowanie pewnej bardzo złożonej, stalowej konstrukcji powłokowej. Analizowana szczegółowo część jest górnym fragmentem stalowego pylonu, na który składa się kilka odcinków powłok cylindrycznych oraz jeden segment stożkowy. Te poszczególne fragmenty konstrukcji były ze sobą połączone spawaniem. Dla znanych parametrów materiałowych, geometrycznych i obciążeniowych wykonano obliczenia w zakresie idealnie sprężystym oraz w zakresie sprężystoplastycznym. Na podstawie tych obliczeń wyciągnięto wniosek o konieczności wzmocnienia tej części pylonu. Zaproponowano istotną modyfikację istniejącej konstrukcji i wykonano dla niej ponownie obliczenia. Wprowadzone dodatkowe elementy powłokowe zablokowały mechanizm plastycznego płynięcia. Zaproponowaną modyfikację można potraktować jako jedną z możliwych koncepcji wzmocnienia konstrukcji. Wszystkie analizy numeryczne zostały wykonane za pomocą systemu ABAQUS. Pewne wybrane fragmenty obliczeń były weryfikowane także z pomocą systemu COSMOS/M.
Źródło:: Civil and Environmental Engineering Reports; 2014, 14; 27-36
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Qualitative and quantitative analysis of tensegrity domes
Autorzy:: Obara, Paulina
Solovei, Maryna
Tomasik, Justyna
Powiązania:: https://bibliotekanauki.pl/articles/2204491.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tensegrity dome
self-stress state
infinitesimal mechanism
geometrical non-linear analysis
kopuła tensegrity
stan samonaprężenia
mechanizm nieskończenie mały
analiza nieliniowości geometrycznej
Opis:: The paper concerns steel domes with regard to the special structures named tensegrity. Tensegrities are characterized by the occurrence of self-stress states. Some of them are also characterized by the presence of infinitesimal mechanisms. The aim of this paper is to prove that only tensegrity domes with mechanisms are sensitive to the change of the level of initial prestress. Two tensegrity domes are considered. In addition, a standard single-layer dome is taken into account for comparison. The analysis is carried out in two stages. Firstly, the presence of the characteristic tensegrity features is examined (qualitative analysis). Next, the behavior under static external loads is studied (quantitative analysis). In particular, the influence of the initial prestress level on displacements, effort, and stiffness of the structure is analyzed. To evaluate this behavior, a geometrically non-linear model is used. The model is implemented in an original program written in the Mathematica environment. The analysis demonstrates that for a dome with mechanisms, the adjustment of pre-stressing forces influences the static properties. It has been found that the stiffness depends not only on the geometry and properties of the material but also on the initial prestress level and external load. In the case of the non-existence of mechanisms, structures are insensitive to the initial prestress level.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144574
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Applying Harmonic Analysis in the Measurements of Geometrical Deviations of the Crankshafts – Selecting Support Conditions
Autorzy:: Nozdrzykowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/2064978.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: harmonic analysis
geometrical deviations
elastic deflections
crankshafts
support conditions
Opis:: The article presents principles of the most suitable support conditions which enable elimination of deflections and elastic deformations of crankshafts under their self-weight. On the basis of the formulated principles sample calculations of force values of support reactions were performed. This guarantees zero value of deflections on main journals depending on the angle of rotation of the shaft, applying available programme of strength calculations Nastran FX 2010. The obtained results have been approximated with a mathematical equation applying the calculating method based on the harmonic analysis theory. Then a comparative assessment of the force diagram (the forces were obtained via strength calculations and mathematical model including so called mutual inter-correlation coefficient) was made. The obtained results of comparative analysis showed high correspondence between the compared diagrams. Presented procedures of determining the required forces ensuring elimination of deflections and elastic deformations can be applied to measurements of crankshaft geometrical deviations realized on the basis of a measuring system with, so called, flexible support of a measured object.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 191--195
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Analysis of geometrical features of a developing lateral root by means of biophysical tools
Autorzy:: Szymanowska-Pulka, J.
Lipowczan, M.
Karczewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/80971.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conference
root formation
lateral root
Arabidopsis
geometrical feature
analysis
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Inverse method for a one-stage spur gear diagnosis
Autorzy:: Akrout, A.
Tounsi, D.
Taktak, M.
Abbes, M. S.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/949292.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Independent Component Analysis (ICA)
source identification
gear mechanism
geometrical defects
Opis:: In this paper, a source separation approach based on the Blind Source Separation (BSS) is presented. In fact, the Independent Component Analysis (ICA), which is the main technique of BSS, consists in extracting different source signals from several observed mixtures. This inverse method is very useful in many fields such as telecommunication, signal processing and biomedicine. It is also very attractive for diagnosis of mechanical systems such as rotating machines. Generally, dynamic responses of a given mechanical system (displacements, accelerations and speeds) measured through sensors are used as inputs for the identification of internal defaults. In this study, the ICA concept is applied to the diagnosis of a one-stage gear mechanism in which two types of defects (the eccentricity error and the localized tooth defect)are introduced. The finite element method allows determination of the signals corresponding to the acceleration in some locations of the system, and those signals may be used also in the ICA algorithm. Hence, the vibratory signatures of each defect can be identified by the ICA concept. Thus, a good agreement is obtained by comparing the expected default signatures to those achieved by the developed inverse method.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 617-628
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Opredelenie korreljacionnojj svjazi mezhdu otdel'nymi geometricheskimi parametrami zeren razlichnykh kul'tur
Determination of correlation relationship between individual geometrical parameters of grains of different cultures
Autorzy:: Kuzminskijj, R.
Sokolovskijj, O.
Sheremeta, R.
Powiązania:: https://bibliotekanauki.pl/articles/77786.pdf
Data publikacji:: 2015
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:: grain crop
wheat
rye
geometrical parameter
random variable
correlation analysis
Źródło:: Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
1730-8658
Pojawia się w:: Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Analysis of the geometrical changes of celery in a test piece during convection drying
Autorzy:: Lapczynska-Kordon, B.
Fraczek, J.
Powiązania:: https://bibliotekanauki.pl/articles/25474.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: drying
shrinkage
surface
dimension
geometrical change
change analysis
celery
convective drying
Źródło:: International Agrophysics; 2003, 17, 1
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: New Indicators Of Burnished Surface Evaluation – Reasons Of Application
Autorzy:: Toboła, D.
Rusek, P.
Czechowski, K.
Miller, T.
Duda, K.
Powiązania:: https://bibliotekanauki.pl/articles/221546.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: surface geometrical structure
slide diamond burnishing
correlation analysis
discrete Fourier transform
Opis:: Modern production technology requires new ways of surface examination and a special kind of surface profile parameters. Industrial quality inspection needs to be fast, reliable and inexpensive. In this paper it is shown how stochastic surface examination and its proper parameters could be a solution for many industrial problems not necessarily related with smoothing out a manufactured surface. Burnishing is a modern technology widely used in aircraft and automotive industries to the products as well as to process tools. It gives to the machined surface high smoothness, and good fatigue and wear resistance. Every burnished material behaves in a different manner. Process conditions strongly influence the final properties of any specific product. Optimum burnishing conditions should be preserved for any manufactured product. In this paper we deal with samples made of conventional tool steel – Sverker 21 (X153CrMoV12) and powder metallurgy (P/M) tool steel – Vanadis 6. Complete investigations of product properties are impossible to perform (because of constraints related to their cost, time, or lack of suitable equipment). Looking for a global, all-embracing quality indicator it was found that the correlation function and the frequency analysis of burnished surface give useful information for controlling the manufacturing process and evaluating the product quality. We propose three new indicators of burnishing surface quality. Their properties and usefulness are verified with the laboratory measurement of material samples made of the two mentioned kinds of tool steel.
Źródło:: Metrology and Measurement Systems; 2015, 22, 2; 263-274
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 10.

Tytuł:: Profile irregularities of turned surfaces as a result of machine tool interactions
Autorzy:: Boryczko, A.
Powiązania:: https://bibliotekanauki.pl/articles/220535.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: surface irregularities
geometrical structure of surface
machine tool interaction
spectral analysis
Opis:: The paper describes the influence of the machining operation on a surface, which disturbs the projection of the tool profile in the form of its relative movements with respect to the object. The elements of the machine tool undergo constant wear during the machining process, it is therefore important to recognize the effects of their influence on the surface's irregularities. Amplitude-frequency analysis of lateral profiles has been used to evaluate and changes of turned lateral profiles. The results of simulation of radial and axial effects of the machine tool on surface and their spectral components were analyzed. Surfaces obtained in similar machining conditions on lathes operated in various time periods were analyzed spectrally. From the analysis of surface irregularity changes caused by disturbances in movements of the tool against the object, testifying the wear of main machine elements during its operation, the modulated, amplitude-frequency character of changes in surface irregularities of workpiece can be noticed.
Źródło:: Metrology and Measurement Systems; 2011, 18, 4; 691-699
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "geometrical analysis" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język