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Wyświetlanie 1-15 z 341
Tytuł:
3D model preparing patterns for interactive urban visualization
Autorzy:
Pielak, Dominik
Kowalski, Mateusz
Lebiedź, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1955264.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska
Tematy:
architectural modeling
3D modeling
architectural visualization
urban visualization
Opis:
While working on architectural visualizations, the software developer often has to work with graphic designers who create models in a different environment what can cause many complications. For this reason, it is very important to have some guidelines which can protect both the developer and the designer from commixing mistakes. The paper presents a list of such guidelines based on the authors’ experience. The reader can treat the paper as a first step in the development of a service based on cloud computing that verifies the correctness of graphical data in urban visualizations.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 4; 341--349
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A survey of methods for 3D model feature extraction
Autorzy:
Hlavaty, T.
Skala, V.
Powiązania:
https://bibliotekanauki.pl/articles/119225.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
Tematy:
feature extraction
retrieval systems
ekstrakcja cech
systemy wyszukiwania
Opis:
This paper deals with problems that are related to a feature extraction from 3D objects. The main aim of the feature extraction is to describe a shape of 3D object by a feature vector. Then the elements of this feature vector characterize the shape of the own 3D objects and they can serve as a key in searching for similar models. In this paper are introduced current methods for the feature extraction of 3D models and their classification. These methods are based on different mathematical background and according to that they are separated into several groups.
Źródło:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2003, 13; 5-8
1644-9363
Pojawia się w:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi 3D model of wave-induced currents in coastal zone
Autorzy:
Szmytkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/241452.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Opis:
The present model allows for simultaneous computations of depth-variable longshore currents and undertows, being the two most important components of coastal flows, at arbitrarily chosen locations of the nearshore zone, with the assumption of parallel isobaths. In the model, the flow velocities are calculated as functions of energy dissipation due to wave breaking. In the description of the wave-breaking, the effect of a roller has been taken into account. As a result of interaction of the cross-shore and longshore currents, a spiral-like resultant velocity vector appears, variable over water depth. The comparisons of calculated and measured vertical distributions of water flow velocity for conditions of the campaigns "Lubiatowo 87" and "Lubiatowo 96" have shown good conformity between experimental data and the present model.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2002, 49, 1; 57-81
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D model of thermal interactions between human forearm and environment
Autorzy:
Duda, M.
Mochnacki, B.
Powiązania:
https://bibliotekanauki.pl/articles/122811.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
bioheat transfer
temperature field in forearm domain
finite element method
przepływ biociepła
metoda elementów skończonych
Opis:
Thermal processes in the domain of a human forearm are considered. The external surface of forearm is in the direct thermal contact with the environment. The steady state problem is considered. From the mathematical point of view, the task is described by the system of the Poisson-type equations, the boundary conditions given on the contact surface between tissue sub-domains, the boundary conditions determining heat transfer between blood vessels and tissue and the boundary conditions on the external surface of the system. The non-homogeneous forearm domain is reconstructed as accurately as possible (3D task). At the stage of numerical modelling, the finite element method has been used. In the final part of the paper the example of computations is presented.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 17-23
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constructing the 3D-model of a glacier part on the Galindez Island
Autorzy:
Hlotov, Volodymyr
Biala, Myroslava
Powiązania:
https://bibliotekanauki.pl/articles/100328.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
glacier
digital camera
3D modelling
GIS
topographical plan
lodowiec
aparat cyfrowy
modelowanie 3D
plan topograficzny
Opis:
The publication is based on the research carried out at the Ukrainian Polar Station “Academic Vernadsky”, located in the Antarctic region at the Galindez Island. The article establishes relationships between global climate change and changes occurring in the area of Galindez Island based on 3D models of the glacier surface. The article has two parts. The first one reviews software products (AutoCAD, ArcGIS, SketchUp, Digitals) used for three-dimensional surface modeling. We analyze their characteristics, and emphasize the advantages and disadvantages of each program for the purpose of terrestrial 3D modeling. In the second, experimental part of the research, we present 3D models of the glacier surface constructed using various software products. The result of the research presents the obtained model of Galindez Island including all relevant textures and buildings.
Źródło:
Geomatics, Landmanagement and Landscape; 2019, 2; 55-62
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of 3d Model Geometry on Dimensional and Shape Characteristics in Additive Manufacturing
Autorzy:
Tagowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2106565.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
3d printing
3d modelling
CAx
Opis:
Quality of 3d model in simple way translates into quality of final product, obtained from 3d printing. 3d CAx software give possibility to create enormous number of shapes - doesn’t matter solids or surfaces. The question is where is the frontier between quality of 3d model and a value for money of the completed print? Is it always necessary to create as good model as possible? This paper will focus on preparation of 3d models, based on primitives and will show connection between quality of mesh, its size and deviations and quality of obtained samples, in same manufacturing conditions.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 391--396
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D model of anodic oxide coating modified with carbon particles
Model 3D warstwy tlenkowej modyfikowanej cząstkami grafitu
Autorzy:
Służałek, G.
Wistuba, H.
Kubica, M.
Powiązania:
https://bibliotekanauki.pl/articles/328031.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
anodowa warstwa tlenkowa
model 3D
CAD
trzpień-tarcza
cząsteczki grafitu
anodic oxide coating
carbon particles
3D model
pin-on-disc
Opis:
In this paper shown three-dimensional model of composite hard anodic layer modified by carbon particles. Modifications were carried by vacuum sublimation by a graphite electrode. The modified layer is characterized by improved tribological properties (friction coefficient) compared to the unmodified layer. Test conditions and values of the coefficients of friction are presented for the combination of pin-on-disc pair in T-01M tester. The 3D model was made in parametric CAD program Solid Edge v19 pl, which allows to explain the decrease in the coefficient of friction.
W pracy przedstawiono trójwymiarowy model kompozytowej warstwy ceramiczno-grafitowej powstałej w wyniku modyfikowania anodowej powłoki twardej. Modyfikacje przeprowadzono w procesie napylania próżniowego. Warstwa modyfikowana charakteryzuje się lepszymi właściwościami tribologicznymi (współczynnik tarcia) w porównaniu do warstwy niemodyfikowanej. Warunki badań oraz wartości współczynników tarcia zestawiono dla skojarzenia trzpień-tarcza testera T-01M. Model 3D warstwy wykonano w parametrycznym programie CAD Solid Edge v19, który pozawala na wyjaśnienie zmniejszenia się współczynnika tarcia.
Źródło:
Diagnostyka; 2011, 3(59); 61-64
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration analysis of Kenyir Dam power station structure using a real scale 3D model
Autorzy:
Arbain, Azizi
Ahmad Mazlan, Ahmad Zhafran
Zawawi, Mohd Hafiz
Mohd Radzi, Mohd Rashid
Powiązania:
https://bibliotekanauki.pl/articles/396138.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Kenyir Dam power
vibration analysis
dam structures
using 3D model
Frequency Response Function
Finite Element Method
moc Kenyir Dam
analiza drgań
konstrukcja zapory
model 3D
FRF
MES
Opis:
In this paper, the vibration analysis in terms of modal and harmonic responses are investigated for the power station structure of Kenyir Dam in Terengganu, Malaysia. Modal analysis is carried out to provide the dynamic characteristics of the power station which includes the natural frequencies and mode shapes. Meanwhile, the harmonic response analysis is performed by applying the force to the structure to obtain the Frequency Response Function (FRF) in certain range of frequencies. A real scale threedimensional (3D) model of the Kenyir Dam power station is constructed using Solid Works software and imported to ANSYS software for the Finite Element (FE) analysis. A proper boundary condition is taken into consideration to demonstrate the real behaviour of the power station structure. From the results, six most significant natural frequencies and mode shapes including the FRF in all three axes are selected. The highest natural frequency value occurred at 5.4 Hz with the maximum deflection of 0.90361 m in the z axis direction. This value is important in order to verify whether the structure can overcome the resonance phenomenon from the external disturbance forces in the future.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 3; 48-59
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction methods for 3D underwater objects using point cloud data
Autorzy:
Kulawiak, M.
Łubniewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/332592.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
visualizing underwater objects
3D model
shipwrecks imaging
Opis:
Existing methods for visualizing underwater objects in three dimensions are usually based on displaying the imaged objects either as unorganised point sets or in the form of edges connecting the points in a trivial way. To allow the researcher to recognise more details and characteristic features of an investigated object, the visualization quality may be improved by transforming the unordered point clouds into higher order structures. There are many algorithms for constructing meshes from point clouds, some of which are more suited to processing data obtained from particular sources. This article presents the application of several methods for generating 3D models from point clouds for the purpose of reconstructing underwater objects, such as shipwrecks. The article presents the results obtained with each method and discusses possible ways of improving the quality of produced meshes.
Źródło:
Hydroacoustics; 2015, 18; 95-102
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of formulas for processing of measured points representing road surface deformations
Autorzy:
Halgas, J.
Hrubos, M.
Pirnik, R.
Janota, A.
Powiązania:
https://bibliotekanauki.pl/articles/393361.pdf
Data publikacji:
2012
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
laser
skaner
wizualizacja
model 3D
visualization
3D model
scanner
Opis:
The paper describes an initial approach adopted by the authors to create a system usable to monitor the road surface deformations in time and to model them in the 3D environment. To obtain measured data a 2D laser scanner is used to measure a distance of the real environment points. The main part of the paper deals with the derivation of formulas used by a measurement unit to calculate the point coordinates. The formulas result from and reflex a method of 3D measurement using an accelerometer and a gyroscope. The practical experiments have confirmed the ability of the measurement unit to scan the road deformation and the surrounding environment.
Źródło:
Archives of Transport System Telematics; 2012, 5, 1; 7-10
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photogrammetric documentation of archaeological artefacts: The current state of the art and future prospects
Autorzy:
Wiśniewski, Mariusz
Zeman-Wiśniewska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1202248.pdf
Data publikacji:
2019
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Photogrammetry
Photography
3D Documentation
3D Model
Opis:
Photogrammetry has been a part of the curriculum of archaeologists since the early days of photography. This method of obtaining reliable information from non-contact imaging for the purpose of recording, measuring, analyzing and representation of archaeological artefacts is, due to recent advances in imaging techniques and computer technology, going through a renaissance. The history of the method in general terms is discussed in this paper. The authors present new perspectives on current areas of research, including workflows, the use of different hardware and software, and “guerrilla photogrammetry”. Furthermore, the authors propose future directions for the development of the field, like using Smartphones, immersive images, truly virtual museums, and public engagement.
Źródło:
Raport; 2019, 14; 167-176
2300-0511
Pojawia się w:
Raport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of different approaches to 3D numerical model development of the contact zone between elementary asperities and flat surface
Autorzy:
Maciolka, P.
Jedrzejewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/99568.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
flat surfaces
contact
roughness
FEM
3D model
Opis:
This paper presents two triaxial finite element (FE) models: a “full model” and a “quarter model”, representing the contact between the specimen’s rough surface and the ideally smooth and flat surface of the punch. Models have a contact zone that represents the topography of the real surface and has elastoplastic properties close to those of the real contact. The contact zone was entirely modelled on the basis of roughness measurements performed on a real milled specimen made of 5083 aluminium alloy. The developmentof the FE models, the stages in their refinement and the interlinking of the contact zone with the material of the specimen are described. The results of the computed deformations occurring during the specimen contact loading with the punch were compared with the experimental results. The possible causes of the observed deviations of the computer simulation results from the experimental ones were discussed. The models were used to analyse the effect of the specimen’s material properties, i.e. Young’s modulus, yield strength, compressive strength and material hardening, on the deformations in the contact. On this basis a procedure for predicting the parameters describing the contact characteristic in cases of changes in the properties of the subsurface zone is proposed.
Źródło:
Journal of Machine Engineering; 2017, 17, 4; 40-53
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 3D model of the thermal field within the Polish Carpathians and the Carpathian Foredeep (S Poland)
Autorzy:
Kudrewicz, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2060119.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Carpathians
Carpathian Foredeep
temperature
thermal gradient
3D modeling
Opis:
Numerical 3D parametric models of temperature and thermal gradient distribution within the Polish Carpathians and the Carpathian Foredeep are constructed for the interval between ground level and the 160°C isotherm. The model construction was preceded by detailed analysis of over 500 thermal logs from the area investigated and its closest vicinity. This analysis showed that the vertical changes in temperature and thermal gradient have a non-linear character with no regular pattern in the distribution of the parameters modelled, so a 3D modeling approach was chosen as the most appropriate method for their quantitative description. Furthermore, standardization of the thermal logs was recognized as mandatory so the influence of drilling process would be eliminated. Among a broad array of methods and their preconditions discussed, the Kukkonen-Szewczyk method was selected for the data collected in the study area. Modeling results show a close relationship between thermal gradient, lithology and petrophysical rock properties as well as a correlation between the distribution of positive thermal anomalies and yield of hydrocarbon accumulations within the Carpathian Foredeep. The accuracy of the model has been assessed as ~10%. The model was then used for discussion of hydrocarbon generation and prediction of formation temperature.
Źródło:
Geological Quarterly; 2021, 65, 3; 65: 39
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Selected Reverse Engineering Procedures Based on Specific Requirements
Autorzy:
Hrčková, Mária
Koleda, Pavol
Powiązania:
https://bibliotekanauki.pl/articles/2064575.pdf
Data publikacji:
2021
Wydawca:
STE GROUP
Tematy:
reverse engineering
scanning
3D model
point cloud
Opis:
The paper describes a solution of reverse engineering tasks using the equipment of the laboratory of the Technical University in Zvolen. The first task was linked to evaluation of a wear rate of the tool used to for mulching and elimination of unwanted wood or weed vegetation. The obtained data will be used as a base line for determination of the time interval for the tool replacement. We developed a prototype of components and their drawing documentation for a single-purpose machine for cutting barley. We created the 3D model using the method of photogrammetry. The finished drawing documentation and prototypes were handed over to the company KRUP. Finally, we identified the most suitable procedures for creating a model of a part with a complex shape. We tested the techniques of editing the point cloud processing, as well as of smoothing the surfaces and automating the creation of partial geometric elements of the model. Based on the properties of the component, which is the starting point of the entire reverse engineering process and from the achieved results, we set recommendations for the selection of appropriate procedures.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 75--85
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D modelling of the territory of the Ukrainian antarctic station “Academician Vernadsky” based on large-scale topographical research
Autorzy:
Hlotov, Volodymyr Mikołajowicz
Pariichuk, Yulia
Powiązania:
https://bibliotekanauki.pl/articles/100597.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
3D modelling
3D model
model 3D
modelowanie 3D
Opis:
A number of software products that provide the possibility of 3D modelling are analysed. As a result of the analysis, the advantages and disadvantages of each of those were identified and the optimum product for research implementation was selected. Also, a 3D model of the large-scale topographical map of the Ukrainian Antarctic station “Academician Vernadsky” was developed with the aid of Surfer software application.
Źródło:
Geomatics, Landmanagement and Landscape; 2019, 4; 243-250
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 341

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