Wyniki wyszukiwania - BazTech

1

Zastosowanie skaningu laserowego do inwentaryzacji obiektów zabytkowych

Jurczak Marlena Anna

Materiały Budowlane

|

2022

|

nr 5

32--34

PL

W artykule przedstawiono informacje dotyczące technologii BIM (Building Information Modelling), korzyści z jej zastosowania w budownictwie, a przede wszystkim skupiono się na przeprowadzaniu inwentaryzacji obiektów zabytkowych - wykonano prace wstępne wg technologii HBIM (Heritage BIM). Pokazano możliwości wykorzystania chmur punktów, otrzymanych ze skanowania laserowego 3D oraz sam proces ich obróbki. Głównym celem było zaprezentowanie kolejnych etapów opracowania danych ze skaningu i efektu końcowego, jakim był model geometryczny obiektu, na przykładzie zabytkowego dworca w Rokicinach. Na podstawie otrzymanych wyników stwierdzono, że dzięki zastosowanej technice można wykonać prace w krótszym czasie niż za pomocą metod tradycyjnych, a dodatkowo w miejscach trudno dostępnych, z wymaganą dokładnością.

EN

The article presents information on BIM technology (Building Information Modelling), its benefits of use in construction, and in particular focuses on conducting an inventory of historic objects - preliminary work was carried out for HBIM technology (Heritage BIM).The possibilities of using point clouds obtained from 3D laser scanning and the process of their processing were shown. The main goal was to present the next stages of processing data from scanning and the final effect, which was the geometric model, on the example of the historic station in Rokiciny. Based on the obtained results, it was found that thanks to the used technique, it is possible to perform work in a shorter time than using traditional methods, and additionally in hard-to-reach places, with the required accuracy.

2

Sewing Thread Consumption for Chain Stitches of Class 400 using Geometrical and Multilinear Regression Models

Malek Sarah, Khedher Faouzi, Adolphe Dominique C., Jaouachi Boubaker

Autex Research Journal

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2021

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Vol. 21, no. 1

52--62

EN

This work deals with determination of rapid and precise methods to predict the amount of sewing thread needed to sew a garment using different chain stitches of the class 400 (from 401 to 407 chain stitches). At first, to avoid unused stocks, sewing consumption value was determined using a geometrical method (based on different chain stitch shapes). The prediction of the sewing thread consumption was proposed as a function of the studied input parameters, which are fabric thickness, stitch density, yarn linear density, and stitch width. Then, a statistical method based on the multilinear regression was studied. Geometrical and statistical results were discussed. Based on the R2 range, we concluded that the geometrical method is more accurate than the statistical one (from 98.16 to 99.19% and from 97.30 to 98.51%, respectively). Thus, this result encourages industrialists to use geometrical models to predict thread consumption. Also, all studied parameters, contributing to the sewing thread consumption behavior, were investigated and analyzed. The result shows that the most important parameters affecting thread consumption are stitch density followed by stitch width and fabric thickness. The yarn density has a low contribution on the thread consumption value.

3

Prediction of Sewing Thread Consumption for Over-Edge Stitches Class 500 Using Geometrical and Multi-Linear Regression Models

Malek Sarah, Adolphe Dominique C., Jaouachi Boubaker

Autex Research Journal

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2021

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Vol. 21, no. 2

150--162

EN

Rapid and precise methods (geometrical and statistical), which aim to predict the amount of sewing thread needed to sew a garment using different over-edge stitches of class 500 (501, 503, 504, 505, 512, 514, 515, and 516), have been provided. Using a geometrical method of different over-edge stitch shapes, sewing consumption value was determined to avoid the unused stocks for each stitch type. The prediction of the sewing thread consumption relative to each investigated over-edge stitch was proposed as a function of the studied input parameters, such as material thickness, stitch density, yarn diameter, and seam width (distance between the needle and the cutter and the distance between two needles). To improve the established models using a geometrical method, a statistical method based on multi-linear regression was studied. Geometrical and statistical results were discussed, and the coefficient R2 value was determined to evaluate the accuracy of the tested methods. By comparing the estimated thread consumption with the experimental ones, we concluded that the geometrical method is more accurate than the statistical method regarding the range of R2 (from 97.00 to 98.78%), which encourages industrialists to use geometrical models to predict thread consumption. All studied parameters contributing to the sewing thread consumption behavior were investigated and analyzed in the experimental design of interest. It was concluded that the most important parameter affecting thread consumption is the stitch density. The material thickness and the seam width (B1) have a little impact on thread consumption values. However, the seam thread diameter has a neglected effect on thread consumption.

4

Sewing Thread Consumption for Different Lockstitches of Class 300 Using Geometrical and Multi-Linear Regression Models

Malek Sarah, Jaouachi Boubaker, Khedher Faouzi, Adolphe Dominique

Autex Research Journal

|

2020

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Vol. 20, no. 4

415--425

EN

This paper aims to provide rapid and precise methods to allow industrials to predict the amount of sewing thread needed to sew a garment using different lockstitches of class 300 (301, 301/301, 304, 308, 309, 310, 311, 312, and 315). To avoid unused stocks for each stitch type, a sewing consumption value was determined using a geometrical method of different lockstitch shapes. Furthermore, the relationships between overall geometrical models of the studied lockstitches of class 300 were developed. Indeed, based on the geometrical model of lockstitch type 301, all theoretical models proposed were investigated and proved to be accurate. Moreover, referring to the findings, the prediction of the sewing thread consumption relative to each investigated lockstitch was proposed as a function of the studied input parameters. To improve the established models using geometrical technique, a statistical method was conducted. In addition, based on multi-linear regression, compared geometrical and statistical results were discussed and the coefficient R2 value was determined to evaluate the accuracy of the tested methods. By comparing the estimated thread consumption with the experimental ones, we concluded that the accuracy of the models is significant (R2 ranged from 93.91% to 99.10%), which encourages industrialists to use geometrical models to predict thread consumption. Therefore, the accuracy of prediction using the geometrical method is more accurate than the statistical method regarding the range of R2 (from 92.84% to 97.87%). To classify the significance of all studied parameters, their contributions to the sewing thread consumption behavior were analyzed in the experimental design of interest. It was concluded that the most important parameters affecting thread consumption are stitch width, stitch density, and the gap between two needles. The thickness of fabric has a low contribution to the thread consumption value, whereas the effect of yarn count can be neglected.

5

Dekalog BIM

Tomana A.

Budownictwo i Prawo

|

2016

|

R. 19, nr 3

12--14

PL

Building Information Modeling to doskonałe narzędzie dla wszystkich uczestników procesu inwestycyjnego. Technologia BIM wspomaga projektowanie dowolnego obiektu, pomaga określić precyzyjnie termin i harmonogram jego realizacji oraz koszty. Warto zapoznać się zatem z najważniejszymi zasadami dotyczącymi tej technologii, aby uświadomić sobie jak może ułatwić pracę, uzyskać efekty i zminimalizować błędy w realizacji obiektu.

EN

BIM is a perfect tool for all the participants of the investing process. The BIM technology supports designing any desired facility, helps to precisely determine the date and schedule of its execution and the costs. Therefore, it is worth learning the most important rules concerning this technology, to understand how it may make the work easier, achieve results an minimize the errors in executing the facility.

6

Predictive geometrical model of the upper extremity of human fibula

Tufegdzic M., Arsic S., Trajanovic M.

Biocybernetics and Biomedical Engineering

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2016

|

Vol. 36, no. 1

172--181

EN

Computer assisted preoperative planning in orthopedic surgery, as well as designing and manufacturing of personalized fixators, implants and scaffolds requires a good three-dimensional model of bone(s) of the treated patients. Existing methods that convert the Computer Tomography (CT) images into the polygonal three-dimensional models are time-consuming and inefficient. Therefore, we propose a predictive model that allows quick creation of three-dimensional (3D) surface model of a particular bone by measuring the relevant parameters from an X-ray or CT image. In this paper, we present the process of creating a predictive geometrical model using the case of proximal end of fibula as an example. The predictive model is built by defining the referential geometric entities that correspond to anatomical features, based on which appropriate points, axes, planes and curves are created. Using the method of linear and nonlinear regression with four different parameters, which can be measured from X-ray images or anterior-posterior projection of fibula at CT scans, the equations for X, Y and Z coordinates of the selected 168 points are obtained and their predictive values are calculated. These values are used for creating 3D surface model with the aim of two different methods: using loft function and converting these coordinates into point cloud. These models were compared and verified through analysis of deviations and distances between initial model and predictive models. The resulting 3D model has satisfactory accuracy, and the process of its building is much shorter.

7

Liniowy współczynnik przenikania ciepła typowego połączenia ściany zewnętrznej z podłogą na gruncie

Szczepaniak P.

Materiały Budowlane

|

2015

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nr 5

86--88

PL

W artykule przeanalizowano liniowy współczynnik przenikania ciepła Ψg rozwiązania węzła połączenia ściana-podłoga. Wartości wyznaczono z zastosowaniem procedury podanej w PN-EN ISO 10211:2008 dla różnych standardów izolacyjności termicznej przegród.

EN

This paper presents the linear heat transfer coefficient Ψg solutions of wall/floor junction. The values have been calculated for various thermal insulation building elements by the procedure given in PN-EN ISO 10211:2008.

8

Visualization and Interaction in the atlas of the human brain, head and neck

Nowinski W. L.

Machine Graphics and Vision

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2014

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Vol. 23, No. 3/4

3-10

EN

Our ultimate objective is to create a holistic and reference atlas of the whole adult human brain along with the head and neck. Several techniques have been employed to create atlases. Here we discuss the atlas design and use from a point of view of two key techniques, visualization and interaction. For visualization, surface rendering of a geometrical model of the brain, head and neck is employed. Geometrical model ensures anatomic parcellability, high (sub-pixel) resolution, editibility, extendibility, structure separability, structure-to-structure conflict detection, and integration a knowledge-based content with the atlas. Interaction allows the user to create and explore any region of interest along with its surroundings just with a few clicks, taking into account that the atlas provides a rich set of functions and the number of atlas components is about 3,000. There are seven types of interaction enabling to: select and deselect tissue classes/groups/individual structures, do real-time manipulation, do virtual dissections, select and scroll the original scans, query a structure to get its label or location, get stereotactic coordinates and measure distances, and support other functionality. This design of visualization and interaction provides a fast and easy to use solution, and allows the atlas to run on desktop and mobile iPad and Android-based platforms.

9

Modelowanie brony talerzowej o dużej szerokości, uwzględniające różne położenia robocze i transportowe

Talarczyk W., Łowiński Ł.

Journal of Research and Applications in Agricultural Engineering

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2013

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Vol. 58, nr 2

177--180

PL

Przedstawiono modele geometryczne bron talerzowych o szerokości roboczej 6 m, opracowane w ramach projektu celowego, we współpracy Przemysłowego Instytutu Maszyn Rolniczych w Poznaniu z firmą BOMET Węgrów. Omówiono założenia funkcjonalno-konstrukcyjne uwzględnione podczas modelowania i budowę bron talerzowych.

EN

Presented geometrical models of disc harrow of 6 m working width, developed in the target oriented project, in collaboration of Industrial Institute of Agricultural Engineering in Poznań with the company BOMET Węgrów. Discussed the functional and structural assumptions taken into account in modeling and construction of disc harrows.

10

Geometric and Structural Model of a Spatial Knitted Product

Pieklak K., Mikołajczyk Z.

Fibres & Textiles in Eastern Europe

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2013

|

Vol. 21, no. 4 (100)

99--105

EN

The paper presents a structural and geometric model of spatial warp-knitted fabrics using an angular solid of square cross-section as an example. An algorithm for designing the geometry of knitted fabric’s spatial architecture with references to two components: the external and internal layer was determined. The structure of stitches of the structural elements of knitted fabric was presented. An algorithm for modelling the structure of spatial knitted fabric and composite was also determined. Computational procedures of the structural and physical parameters of knitted fabrics and composites were described, on the basis of which the program for simulating their properties was constructed.

PL

W publikacji przedstawiono model geometryczno-strukturalny kolumienkowych dzianin przestrzennych na przykładzie bryły graniastej o przekroju kwadratowym. Opracowano algorytm projektowania geometrii architektury przestrzennej dzianiny w odniesieniu do dwóch elementów składowych jakimi są warstwy zewnętrzne i warstwa wewnętrzna. Przedstawiono strukturę splotów wymienionych elementów budowy dzianiny. Opracowano algorytm modelowania strukturalnego dzianiny przestrzennej i kompozytu. Sformułowano procedury obliczeniowe parametrów strukturalnych i fizycznych dzianiny i kompozytu, na bazie których zbudowano program symulacji ich właściwości.

11

Analiza wyników pomiarów wybranych cech geometrycznych używanych części maszyn

Kaźmierczak M.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

|

2011

|

nr 2

45-58

PL

W artykule opisano sposób realizacji seryjnych pomiarów wybranych cech geometrycznych używanych tłoków, przy zastosowaniu współrzędnościowej techniki pomiarowej. Pomiary wykonano na maszynie pomiarowej Zeiss Accura 7, wyposażonej w sztywną skanującą głowicę VastXT. W podsumowaniu zestawiono wyniki pomiarów niespełna dwustu tłoków, uzupełnione podstawową analizą statystyczną.

EN

The article describes how to make serial measurements of selected geometric features of used pistons, using a coordinate measuring technology. Measurements were made using measuring machine Zeiss Accura 7, and rigid head scanning VastXT. The conclusion summarizes the measurements results of less than two hundred pistons, accompanied by basic analysis.

12

Analiza wpływu uproszczeń modelu geometrycznego obrabiarki KCI 210/280 NM na wyniki uzyskane metodą elementów skończonych

Grzywocz J.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

|

2011

|

nr 2

123-134

PL

W artykule przedstawiono analizy statyczne modelu geometrycznego w formie uproszczonej oraz kompletnej obrabiarki KCI 210/280NM. Przeprowadzono badania symulacyjne metodą, elementów skończonych w środowisku ANSYS określając wartości przemieszczeń w kierunku działania składowych sił skrawania. Następnie zostały porównane wyniki analiz statycznych MES ze względu na uproszczony oraz kompletny model geometryczny obrabiarki przy założonym wysuwie suwaka narzędziowego.

EN

The article presents the analysis of static geometric model in simplified and complete form of KCI 210/280 NM machine tool. Simulation conducted with finite element method in system ANSYS based on identifying displacements as results of acting cutting force components. The main part of the research was focused on comparison of stiffness factors estimated for the complete and simplified model of the considered machine tool. As it has been revealed, the simplification of models must be done very carefully since such simplification can cause substantial errors.

13

Structural design engineering of woven fabric by soft computing: part I - plain weave

Mishra R., Kremenakova D., Behera B K, Militky J.

Autex Research Journal

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2011

|

Vol. 11, no. 2

37--41

EN

An attempt has been made to optimise the engineering attributes of a plain weave fabric according to certain requirements. A simplified algorithm was used to solve fabric geometrical model equations, and relationships were obtained between useful fabric parameters such as thread spacing and crimp, fabric cover and crimp, warp and weft cover. Such relationships help in guiding the direction for moderating fabric parameters. The full potential of the Peirce fabric geometrical model for plain weave has been exploited by soft computing. The interrelationships between different fabric parameters for jammed structures, non-jammed structures and special cases in which the cross-threads are straight were obtained using a suitable algorithm. It is hoped that the fabric designer will benefit from the flexibility in choosing fabric parameters for achieving any end use with the desired fabric properties.

14

Wirtualna stabilizacja kręgosłupa człowieka po złamaniu kompresyjnym na odcinku piersiowo-lędźwiowym

Zięba Ł., Dąbrowska-Tkaczyk A.

Aktualne Problemy Biomechaniki

|

2011

|

z. 5

189--194

PL

W pracy przedstawiono model geometryczny odcinka piersiowo lędźwiowego kręgosłupa (Th12 - L2), ze złamanym kompresyjnie trzonem kręgu L1 wraz z systemem korekcyjno - stabilizacyjnym USS Fracture System. Opracowano modele geometryczne struktur anatomicznych w tym trzonów Th12, L2 oraz połamanego trzonu L1, tkanek miękkich, czyli: więzadeł podłużnych: przedniego ALL i tylnego PLL oraz krążków międzykręgowych, jak również modele implantów zastosowanych do dwupoziomowej stabilizacji. Wykorzystano dane CT pacjenta oraz oprogramowanie Mimics 13.1 i SolidWorks 2010.

EN

A geometrical model of the two-level-stabilization of human thoraciclumbar spine (Th12 – L2) with compressive fractured L1 vertebral body has been presented in the paper. The developed model comprises both the aforementioned bone anatomical structures and the soft tissue ones (anterior and posterior longitudinal ligaments (ALL, PLL) and spinal discs) and models of the applied USS Fracture system of implants. CT data of a patient and the Mimics 13.1 and SolidWorks 2010 software packages have been used in the modeling procedure.

15

Proces projektowo - konstrukcyjny budowy wirujących dysków

Chlebus E., Górski P., Krot K., Hufenbach W., Czulak A.

Mechanik

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2010

|

R. 83, nr 1

68-68

PL

Przedstawiono proces projektowo-konstrukcyjny dysków wirujących z dużymi prędkościami. Do analiz wykorzystano, opisane w literaturze, modele obliczeniowe tarczy o równej wytrzymałości oraz tarczy z otworem, o ustalonej grubości. Kolejny etap obejmował wykonanie modeli geometrycznych dysków. Zaprezentowano kilka wariantowych rozwiązań geometrii dysków. Na podstawie wykonanych analiz podjęto decyzję o budowie dwóch dysków: z kanałami radialnymi prostymi i zakrzywionymi.

EN

Presents the design and construction process of high speed rotating discs. For the analysis the authors used, described in literature, computational models of a uniform-strength disc and a disc of a constant thickness with a nole. Then geometrical models of discs have been designed. The authors showed a few different versions of disc geometry. Basing on carried out analysis the authors decided to build two kinds of discs: the disc with straight internal holes and the disc with bent internal holes.

16

Inżynieria odwrotna w praktyce. Część II

Hylewski D., Kolka A.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

|

2008

|

nr 3

145-152

PL

Artykuł przedstawia praktyczne wykorzystanie inżynierii odwrotnej. Przedstawiono kolejne etapy realizacji zadania: adaptacja geometrii, planowanie procesu technologicznego, realizacja procesu na centrum frezarskim, ocena odtworzonego przedmiotu.

EN

The article shows reverse engineering in practice. The main goal of work was presentation the way of creating physical model using the machines and software at The Machine Technology Department. Geometry adaptation, process planning in to CATIA Manufacturing environment was presented. Finally comparison between CAD model and manufactured workpiece have been shown.

17

Numeryczny test przyziemienia podwozia głównego samolotu transportowego

Krasoń W., Małachowski J.

Mechanik

|

2008

|

R. 81, nr 1

58-59

PL

Omówiono metodykę budowy numerycznego modelu podwozia głównego i założenia przyjęte do realizacji analiz dynamicznych tego układu konstrukcyjnego. Podano model geometryczny i odkształcalny MES podwozia. Omówiono wnioski wynikające z realizacji testów numerycznych opisujących zjawiska współpracy poszczególnych podzespołów podwozia.

EN

Discussed is a method suggested for the aircraft undercarriage numeric model planning with the requirements to be considered in analysis of dynamic parameters of the said structural system indicated. Explained are geometry and FEM deflection models of the undercarriage. Also discussed are conclusions arrived at from realization of numerical tests describing the phenomena related to operation mating of individual undercarriage subassemblies.

18

Numeryczna analiza wpływu parametrów eksploatacyjnych na wytężenie mostu nożycowego

Krasoń W., Filiks Ł.

Górnictwo Odkrywkowe

|

2008

|

R. 49/2, nr 4-5

62-68

PL

Mosty nożycowe są wysoko mobilnymi konstrukcjami modułowymi. Jeden moduł-przęsło takiego mostu składa się z dwóch członów, gotowych jezdni wraz z konstrukcją nośną połączonych złączami sworzniowymi. Analiza wytężenia takich obiektów jest mocno utrudniona. Ze względu na wysokie koszty badań eksperymentalnych takich obiektów, w pracy omówione będą wybrane aspekty symulacji komputerowych. Zaprezentowane będą modele geometryczne 3D oraz modele powłokowo-bryłowe pojedynczego przęsła mostu BLG.

EN

Scissor bridges are characterized by high mobility and modular structure. Single module-span is consist of two spanning part of the bridge; two main truck and support structure. Between modules of the single bridge span are used pin joints. Because experimental study are very expensive it has been decided to perform numerical investigations. Some aspects of this numerical analysis of scissor bridge operation in this paper will be presented. Geometrical and 3D shell and solid models of one span module of BLG bridge will be discussed.

19

Modele geometryczne mostu nożycowego.

Krasoń W., Filiks Ł.

Mechanik

|

2007

|

R. 80, nr 10

852-852

PL

Omówiono wybrane aspekty budowy modeli geometrycznych 3D jednego przęsła mostu nożycowego złożonego z dwóch torów jezdnych. Przedstawione modele geometryczne konstrukcji zostaną zastosowane w symulacjach komputerowych pracy mostu nożycowego. Zaprezentowano geometryczne modele powłokowe i bryłowe pojedynczego przęsła mostu BLG przeznaczone do opracowania modeli kinematycznych i dyskretnych MES. Modele takie zastosowane będą w symulacjach kinematyki procesu montażu i demontażu oraz w analizie wytrzymałości badanego przęsła mostu nożycowego, poddanego oddziaływaniu wybranego zestawu obciążeń zewnętrznych i warunków podparcia na brzegach przeprawy.

EN

Some selected aspects of the 3D models of a single span of the scissors type bridge consisting of two rail tracks are discussed. Geometric shell models and solid models of a single span of the BLG bridge intended for support of research on kinematic and on discrete MES models are presented.

20

Formalization of Location and Spacing Tasks Modern Methods of Design

Chura I., Kernytskyy A.

Machine Dynamics Problems

|

2007

|

Vol. 31, No. 3

15-24

EN

Tasks of optimal location and spacing of geometric objects arising during material cutting, animation, design of PCBs, design of plans of both habitual and industrial areas, location of equipments and loads and design of economic processes belongs to the class of the abovementioned problems. Therefore, the problem of ES development for the location and spacing problems solution is vital. Interest to the location and spacing tasks solution is determined by the wide spectrum of practical applications from the one side and by the complication and no triviality of the development of mathematical models vital for their adequate description. Regardless the variety of such problems, all of them include the formulation: it is necessary to locate the geometric objects in the given region taking into account terms and limitations so that achieved value of an efficiency function are the nearest ones to the optimum. The tasks of location and spacing of flat objects depending on their application domain are classified in the paper. On the basis of the conducted analysis of practical problems mathematical formalization is presented. As a result of analysis of the known practical problems of location and spacing their similarity by input an output data is distinguished. All formalized problems are joined by main properties: a) there is questions about location of geometric objects of arbitrary form in the regions of arbitrary geometric form, b) each of problems is formalized, at least verbally, as the problem of mathematical programming. In other words, a problem appears as some terms that are limitations on the parameters of placing of objects at implementation of which it is necessary to achieve put objective. Under achievement of purpose the receipt of the best quality or optimum quantity is understood, that are expressed by correlations and relied on the parameters of placing of objects. It is known, that such correlations in the mathematical programming are named functions or functions of quality having a special purpose.