Academic literature on the topic 'Solid Edge (Computer file)'
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Journal articles on the topic "Solid Edge (Computer file)"
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Miller, Ed. "PDM Moves to the Mainstream." Mechanical Engineering 120, no. 10 (1998): 74–79. http://dx.doi.org/10.1115/1.1998-oct-3.
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Product data management (PDM) has proven its value as a critical tool in handling the enormous amounts of technical information companies generate. Now the PDM industry is applying this experience to more affordable systems targeted at smaller organizations. Several suppliers have entered the market with economical approaches aimed specifically at midsized companies. Many companies use PDM to eliminate inefficiencies in the engineering change process. Diebold, Inc. reduced engineering change cycle time by 30 percent through process automation with PDM. IBM is using PDM technology in product development for sharing data among groups, designing tools tightly coupled with release and change processes, interfacing with procurement and other services, and establishing real-time communication of data across the enterprise. Engineers increasingly are using PDM viewing features to track subsystems. Virtual-mockup capabilities enable engineers to import all the parts files for a product designed in Solid Edge, regardless of computer-aided design (CAD) vendor or file format.
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MALARZ, K., and A. Z. MAKSYMOWICZ. "A SIMPLE SOLID-ON-SOLID MODEL OF EPITAXIAL FILM GROWTH: SURFACE ROUGHNESS AND DYNAMICS." International Journal of Modern Physics C 10, no. 04 (1999): 645–57. http://dx.doi.org/10.1142/s0129183199000486.
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The random deposition model must be enhanced to reflect the variety of surface roughness due to some material characteristics of the film growing by vacuum deposition or sputtering. The essence of the computer simulation in this case is to account for possible surface migration of atoms just after the deposition, in connection with the binding energy between atoms (as the mechanism provoking the diffusion) and/or diffusion energy barrier. The interplay of these two factors leads to different morphologies of the growing surfaces, from flat and smooth ones to rough and spiky ones. In this paper, we extended our earlier calculation by applying an extra diffusion barrier at the edges of terrace-like structures, known as the Ehrlich–Schwoebel barrier. It is experimentally observed that atoms avoid descending when the terrace edge is approached, and these barriers mimic this tendency. Results of our Monte Carlo computer simulations are discussed in terms of surface roughness, and compared with other model calculations and some experiments from literature. The power law of the surface roughness σ against film thickness t was confirmed. The nonzero minimum value of the growth exponent β near 0.2 was obtained which is due to the limited range of the surface diffusion and the Ehrlich–Schwoebel barrier. Observations for different diffusion ranges are also discussed. The results are also confirimed with some deterministic growth models.
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Camargos, Germana De Villa, Priscilla Cardoso Lazari-Carvalho, Marco Aurélio de Carvalho, Mariane Boaventura Castro, Naysa Wink Neris, and Altair Antoninha Del Bel Cury. "3D finite element model based on CT images of tooth." Brazilian Journal of Oral Sciences 19 (August 14, 2020): e208910. http://dx.doi.org/10.20396/bjos.v19i0.8658910.
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Aim: This study aimed the description of a protocol to acquire a 3D finite element (FE) model of a human maxillary central incisor tooth restored with ceramic crowns with enhanced geometric detail through an easy-to-use and low-cost concept and validate it through finite element analysis (FEA). Methods: A human maxillary central incisor was digitalized using a Cone Beam Computer Tomography (CBCT) scanner. The resulted tooth CBCT DICOM files were imported into a free medical imaging software (Invesalius) for 3D surface/geometric reconstruction in stereolithographic file format (STL). The STL file was exported to a computer-aided-design (CAD) software (SolidWorks), converted into a 3D solid model and edited to simulate different materials for full crown restorations. The obtained model was exported into a FEA software to evaluate the influence of different core materials (zirconia - Zr, lithium disilicate - Ds or palladium/silver - Ps) on the mechanical behavior of the restorations under a 100 N applied to the palatal surface at 135 degrees to the long axis of the tooth, followed by a load of 25.5 N perpendicular to the incisal edge of the crown. The quantitative and qualitative analysis of maximum principal stress (ceramic veneer) and maximum principal strain (core) were obtained. Results: The Zr model presented lower stress and strain concentration in the ceramic veneer and core than Ds and Ps models. For all models, the stresses were concentrated in the external surface of the veneering ceramic and strains in the internal surface of core, both near to the loading area. Conclusion: The described procedure is a quick, inexpensive and feasible protocol to obtain a highly detailed 3D FE model, and thus could be considered for future 3D FE analysis. The results of numerical simulation confirm that stiffer core materials result in a reduced stress concentration in ceramic veneer.
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Winter, John M., and Robert E. Green. "Real Time Synchrotron Topography Using a CID Array Camera with Digital Image Acquisition and Processing." Advances in X-ray Analysis 38 (1994): 215–19. http://dx.doi.org/10.1154/s037603080001781x.
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Synchrotron white beam transmission topography of GaAs as previously reported by the authors relied on scanning specimen and film synchronously through the incident x-ray beam to record transmission topographic images en film. Sometimes the total dose required for reasonable contrast on film carried with it enough thermal deposition to cause elastic warping of the wafer. To escape these problems, a real time system was assembled. This system included an image intensifier, a solid state camera, a computer board to frame-grab and digitize images, and appropriate image processing software. With this system, a three inch specimen was scanned from edge to edge in one minute. At this scan rate, the incident x-ray beam had to be significantly attenuated to avoid saturating the intensifier output.
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Tasaki, Satoko, and Soshu Kirihara. "Zinc Oxide Modeling to Create Semiconductor Dendrites by Using Micro Stereolithography." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, CICMT (2011): 000193–98. http://dx.doi.org/10.4071/cicmt-2011-wa24.
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Zinc oxide ceramics exhibit various semiconductor properties through optimized elements or materials doping. The elements doping of aluminum or gallium can control the electric conductivity, and composites doping of indium and rare earth such as yttrium can increase the thermoelectric conversion efficiency. In this investigation, dendritic lattice structures of the zinc oxide semiconductors with periodically ordered arrangements or self similar patterns were fabricated successfully to increase the surfaces area and porosity values by using micro patterning stereolithography of a computer aided design and manufacturing. These semiconductor dendrites with penetrable paths and extensive interfaces will be used for fluid and heat flow receptors and applied to the novel sensor devices and energy generators. The dendritic lattice models sliced into a series of cross sectional patterns with uniform thickness by using a stereolithographic file format convertor. These numerical data were transferred into the micro processing equipment. High viscosity slurry material was prepared through the mixing of photo sensitive acrylic resin and the zinc oxide particle at 30 % in volume fraction. The slurry was supplied on a flat substrate with 8 μm in layer thickness by using a mechanical knife edge. The cross sectional image was exposed on the slurry surface by using digital micro mirror devices. Through the layer by layer processes, the solid component was obtained with micrometer order part accuracies. The dense ceramic sample was purchase after de-waxing and sintering process.
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DAMMERS, A. J., and S. RADELAAR. "Simulation of Polycrystalline Film Growth." International Journal of Modern Physics C 02, no. 01 (1991): 310–15. http://dx.doi.org/10.1142/s0129183191000391.
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Thin solid films deposited from a vapour phase may exhibit a variety of morphological features. In the surface-diffusion dominated regime (no recrystallization) columnar structures with preferential crystallographic orientations develop, a phenomenon which has been frequently observed experimentally and which was explained qualitatively many years ago. We performed simulations of a two-dimensional model of such a system, consisting of randomly oriented squares, growing from a line. As a new result we find, that the characteristic length scale <Δx> of the growing surface (average edge length projected on the substrate) diverges as a function of time according to a power law <Δx>~tp, with p≈0.52.
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Dyuryagina, Antonina, Aida Lutsenko, Alexandr Demyanenko, Vitaliy Tyukanko, Kirill Ostrovnoy, and Alyona Yanevich. "Modeling the wetting of titanium dioxide and steel substrate in water-borne paint and varnish materials in the presence of surfactants." Eastern-European Journal of Enterprise Technologies 1, no. 6(115) (2022): 31–42. http://dx.doi.org/10.15587/1729-4061.2022.252757.
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This paper reports the results of studying the effect of two additives such as polyether siloxane (PS) and sodium polyacrylate (SPA) on the wetting of various substrates in water-borne paints (WB paints). Titanium dioxide (TiO2), paraffin (PA), steel (ST), and glass (GL) were used as solid substrates. The edge wetting angle (θ0) and the ratio (dCosθ/dСS) were used as the criterion for assessing the wettability of solid substrates. In aqueous solutions (without acrylic resin), both surfactants improve the wetting of the substrates. For PS, all the substrates studied, depending on θ depression, can be arranged in a row: ST>PA>GL>TiO2. For SPA: PA>TiO2>GL>ST. The introduction of an acrylic film-forming agent in the composition enhances the wetting ability of SPA (in comparison with the aqueous solution of surfactants). With an increase in the concentration of SPA from 0 to 4 g/dm3 in acrylic resin solutions, the edge wetting angle of steel decreases by 6÷8° (while in water by only 3°). With respect to TiO2, the wetting activity of SPA does not depend on the acrylic content of the water. PS in acrylic-containing compositions exhibits worse wetting activity than SPA. The introduction of surfactants in the compositions improves the quality of coatings. With optimal SPA contents in the compositions, the corrosion rate of coatings is reduced (in distilled water by 45 %, in 60 % NaCl solution by 60 %). At the same time, the gloss of coatings increases by 50 % while adhesion increases by 2 points (according to ISO 11845: 2020). This is fully correlated with the nature of the effect of surfactants on the wetting of the steel substrate and pigment (titanium dioxide). Based on probabilistic-deterministic planning, the compositions of WB paints were optimized, ensuring their maximum wetting of TiO2 and ST. Equations for calculating cosθ depending on the content of acrylic polymer and surfactants have been derived
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Sato, Keiko, Masami Naya, Yuri Hatano, et al. "Biofilm Spreading by the Adhesin-Dependent Gliding Motility of Flavobacterium johnsoniae. 1. Internal Structure of the Biofilm." International Journal of Molecular Sciences 22, no. 4 (2021): 1894. http://dx.doi.org/10.3390/ijms22041894.
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The Gram-negative bacterium Flavobacterium johnsoniae employs gliding motility to move rapidly over solid surfaces. Gliding involves the movement of the adhesin SprB along the cell surface. F. johnsoniae spreads on nutrient-poor 1% agar-PY2, forming a thin film-like colony. We used electron microscopy and time-lapse fluorescence microscopy to investigate the structure of colonies formed by wild-type (WT) F. johnsoniae and by the sprB mutant (ΔsprB). In both cases, the bacteria were buried in the extracellular polymeric matrix (EPM) covering the top of the colony. In the spreading WT colonies, the EPM included a thick fiber framework and vesicles, revealing the formation of a biofilm, which is probably required for the spreading movement. Specific paths that were followed by bacterial clusters were observed at the leading edge of colonies, and abundant vesicle secretion and subsequent matrix formation were suggested. EPM-free channels were formed in upward biofilm protrusions, probably for cell migration. In the nonspreading ΔsprB colonies, cells were tightly packed in layers and the intercellular space was occupied by less matrix, indicating immature biofilm. This result suggests that SprB is not necessary for biofilm formation. We conclude that F. johnsoniae cells use gliding motility to spread and maturate biofilms.
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Mao, Jiao Jie, and Guo Qiang Shen. "Research of PDM System Based on Solid Edge Insight." Applied Mechanics and Materials 456 (October 2013): 656–59. http://dx.doi.org/10.4028/www.scientific.net/amm.456.656.
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Discuss the design of product data management (PDM) system based on Solid Edge Insight: Managed the different user roles by using the Windows SharePoint Services 3.0; Informed file changes to related staff timely by mail server to achieve the collaborative work between different designers that greatly improved design efficiency; Realized online browsing the Solid Edge files and their properties and BOM list via web part provided by the Insight, which made the system more humanized and visualization; Realized document libraries search by using its search view; Introduced the secure sockets layer (SSL) to encrypt network transmission system, which made the system safer and more reliable. Practice results show that this PDM system is able to fulfill the demand of online browsing and managing CAD products or related documents in minor enterprises.
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Jiang, Hong Chun, and Xiao Lei Wang. "Gear-Drive Parametric Design with Femap Express Stress Analysis." Advanced Materials Research 1006-1007 (August 2014): 317–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.317.
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Modeling and finite element analysis functions were combined in Solid Edge to optimize gear parameters. Gear parameters optimization objective and procedure in different conditions were summed up. A complete Excel file was created. An involute gear parametric model was established which was interlinking with the Excel file. And the model’s accuracy would not alter with the diameter’s change. The wizard software for gear drive design and parameter optimization was developed on platform of Solid Edge by Visual Basic tool. This application can guide users getting the initial parameters and optimizing the parameters by the circling method of diminishing parameters, analyzing the precise gear root stress with Femap Express module, and diminishing them again. Users can get a gear model which has a smaller diameter and smaller module and satisfies strength demands.
Dissertations / Theses on the topic "Solid Edge (Computer file)"
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Al-Anssari, Jalal. "Solid Vector Subtraction Operation and 3-D Gradient and Laplacian Spatial Filters of a Field of Vectors for Geometrical Edges Magnitude and Direction Detection in Point Cloud Surfaces." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin159213571577484.
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Naser, Inam. "Rotated Polar Coordinate system, its Solid Vector Mathematical Operations, and 3-D Unsharp Masking and Gradient-Based Laplacian Spatial Filters of a Field of Vectors for Geometrical Edges Detection." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592135647774656.
Full textBooks on the topic "Solid Edge (Computer file)"
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Sándor, Vajna, ed. Solid Edge ST5 - kurz und bündig: Grundlagen für Einsteiger. 5th ed. Springer, 2013.
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Technologies, CADCIM, ed. Solid Edge ST7 for designers (12th edition). CADCIM Technologies, 2015.
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Bajaj, Geetesh. Cutting Edge PowerPoint 2007 For Dummies. John Wiley & Sons, Ltd., 2007.
Find full textBook chapters on the topic "Solid Edge (Computer file)"
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Yamaguchi, Fujio, and Toshiya Tokieda. "Bridge Edge and Triangulation Approach in Solid Modeling." In Frontiers in Computer Graphics. Springer Japan, 1985. http://dx.doi.org/10.1007/978-4-431-68025-3_4.
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Xu, Xun. "Feature Technology." In Integrating Advanced Computer-Aided Design, Manufacturing, and Numerical Control. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-714-0.ch004.
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Throughout the course of the development of CAD, CAPP, and CAM systems, unambiguous representation of a design’s geometry and topology remain an essential part of the task. Since the mid-1990’s, the technology has matured enough to enable such a representation. While geometry and topology provides a basic description of a design part, direct use of it for creation of the part and other applications, can be cumbersome. Take creation of a simple plane with four straight edges as an example. For a B-rep model to fully define the plane, four points are to be created first to be used as four vertices. They are used to define four edges, which are connected one after another to form a closed loop. Finally, a flat surface is fitted onto the loop to form the plane. When a cube is to be designed, the above process needs to be repeated five more times for the other five faces though some of the vertices and edges may be re-used. In addition, the directions of the solid have to be defined through each face. Clearly, this is not a trivial task. Users would find it helpful if the creation of geometry and topology is hidden behind them and only some meaningful parameters of the solid are provided. In the case of a simple cube, length, width, and depth would be the parameters. Hence, the concept of features (i.e. cube or block in the above example) emerged, as did the associated technologies. The same applies for other domains, such as manufacturing and engineering analysis. This chapter aims to give a succinct introduction to various feature technologies such as feature defintions, feature taxonomy, feature representation schemes, and feature-based methodologies. Several important issues are highlighted. These include the application-dependent nature of features, and surface features versus volumetric features.
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Ehrenfeld, David. "Sherlock Nero and Us." In Swimming Lessons. Oxford University Press, 2002. http://dx.doi.org/10.1093/oso/9780195148527.003.0010.
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Some people have a drink when they get home from work—a martini, a beer. Maybe two or three. Life is especially stressful in the twenty-first century. The same indecent forces that are destroying nature are disrupting our working lives as well. Who will own the company tomorrow? Will there be a “reduction in force” or some other euphemism for the ax? When is the next reorganization coming? Is my ten or twenty years of faithful service an asset or, more likely, a sign of obsolescence and suspicious loyalty to bosses and co-workers now out of favor or working for other companies? How am I to answer the fax that arrived at 4:00 p.m., the one that seemed to contradict the fax that arrived at 11:00? When will I find time to fill out the questionnaire from the Resource Management Office, and does it take precedence over the Goals Enhancement Strategy questionnaire that came from the Administrative Services Division? Are my computer files compatible with the new software system, and, if so, why did the box on the screen say, “This paragraph is un-readable. Do you wish to substitute a standard paragraph?” Just what is our real work, anyway? Alcohol can take the edge off stress, but it is not everyone’s consolation. Some choose television or the Internet; mine is to pick up one of the scores of detective novels that I keep close to hand and plunge in. Then I can forget for a little while the vice presidents, deans, and other academic, corporate-style bosses who do their best to make life in the modern university an unproductive misery. In this way I can put out of mind, temporarily, the pleas of students who don’t understand why there are no courses to take and the ravings of colleagues who can’t figure out how to cope with the contradictory, impossible demands placed on them. Why should detective stories be, for so many, such a good and entertaining way of escaping from reality? That they are is clear; billions of copies have been sold.
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"Networking Fundamentals." In Constructing an Ethical Hacking Knowledge Base for Threat Awareness and Prevention. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7628-0.ch004.
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This chapter introduces to basics of computer networking and associated widely used essential networking communication protocols. The chapter provides the comparison of OSI and TCP model along with details of internet layer protocols including internet protocol (IP), IP addressing schemes, internet control messaging protocol (ICMP), etc. Next, the chapter discusses transport layer protocols transmission control protocol (TCP) and user datagram protocol (UDP) in detail. Application layer protocols including dynamic host control protocol (DHCP), secure shell (SSH), file transfer protocol (FTP), trivial FTP (TFTP), simple network management protocol (SNMP), hyper text transfer protocol secure (HTTPS), network time protocol (NTP), domain name system (DNS), and simple mail transfer protocol (SMTP) are also explained in this chapter. One just cannot attack a networking protocol without knowing how it works. Having a solid introduction about computer networking and network protocols is fundamental in the ethical hacking world. This chapter quickly revisits all essential concepts related to computer networking.
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Cruz, Christophe. "Use of Semantics to Manage 3D Scenes in Web Platforms." In Encyclopedia of Multimedia Technology and Networking, Second Edition. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-014-1.ch200.
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Computer graphics have widely spread out into various computer applications. After the early wire-frame computer generated images of the 1960s, spatial representation of objects improved in the 1970s with Boundary Representation (B-Rep) modeling, Constructive Solid Geometry (CSG) objects, and free-form surfaces. Realistic rendering in the 1990s, taking into account sophisticated dynamic interactions (between objects or between objects and human actors, physical interactions with light, and so on) now make 3Dscenes much better than simple 3D representations of the real world. Indeed, they are a way to conceive products (industrial products, art products, and so on) and to modify them over time, either interactively or by simulation of physical phenomena (Faux & Pratt, 1979; Foley, Van Dam, Feiner, & Hughes, 1990; Kim, Huang, & Kim, 2002). Large amounts of data can be generated from such variety of 3D-models. Because there is a wide range of models corresponding to various areas of applications (metallurgy, chemistry, seismology, architecture, arts and media, and so on) (DIS 3D Databases, 2004; Pittarello & De Faveri, 2006; SketchUp from Google, 2006), data representations vary greatly. Archiving these large amounts of information most often remains a simple storage of representations of 3D-scenes (3D images). To our knowledge, there is no efficient way to manipulate, or archive, extract, and modify scenes together with their components. These components may include geometric objects or primitives that compose scenes (3D-geometry and material aspects), geometrics transformations to compose primitives objects, or observation conditions (cameras, lights, and so on). Difficulties arise less in creating 3D-scenes, rather than in the interactive reuse of these scenes, particularly by database queries, such as via Internet. Managing 3Dscenes (e.g., querying a database of architectural scenes by the content, modifying given parameters on a large scale, or performing statistics) remains difficult. This implies that DBMS should use the data structures of the 3D-scene models. Unfortunately, such data structures are often of different or exclusive standards. Indeed, many “standards” exist in computer graphics. They are often denoted by extensions of data files. Let us mention, as examples, 3dmf (Apple’s Quickdraw 3D), 3ds (Autodesk’s 3DStudio), dxf (AutoDesk’s AutoCAD), flt (Multigen’s ModelGen), iv ( Silicon Graphics’ Inventor ), obj ( Wavefront/Alias ), and so on. Many standardization attempts strive to reduce this multiplicity of various formats. In particular, there is Standard for the Exchange of Product model data (STEP) (Fowler, 1995), an international standard for computer representation and exchange of products data. Its goal is to describe data bound to a product as long as it evolves, independently of any particular computer system. It allows file exchanges, but also provides a basis for implementing and sharing product databases. Merging 3D information and textual information allows the definition of the project’s mock-up. As a matter of fact, 3D information describes CAD objects of the project and textual added information gives semantic information on geometries. The main issues are the sharing and the exchange of the digital mock-up. The next section explains how we use a digital mock-up to create an information system with the help of the semantic included in geometric information. Information is exchanged and shared through a Web Platform.
Conference papers on the topic "Solid Edge (Computer file)"
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Li, Yaojun, and Fujun Wang. "Computer-Aided Design and Numerical Flow Analysis of Axial-Flow Pump With Inducer." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95369.
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Axial-flow pump equipped with inducer are widely used in marine propulsion systems. The interaction of inducer and impeller has significant effect on the performance of pump. In this study, a special axial-flow pump is designed and analysed by CAD-CFD approaches to study the interaction of inducer and impeller. The pump includes two main elements, an inducer with 3 blades mounted on a conical hub and a 6-blade impeller. The blade angle of impeller is adjustable to generate different relative circumferential angles between the inducer blade trailing edge and the impeller blade leading edge. The 3D pump solid model is generated by taking the data file as interface between hydraulic-design and 3D modelling. A computational fluid dynamics code is used to investigate the flow characteristics and performance of the axial-flow pump. Numerical simulation is performed by adopting 3D RANS equations with RNG k-epsilon turbulence model. An unstructured grid system and the finite-volume method are used for the solution procedure of the discretized governing equations for this problem. The rotator-stator interaction is treated with a multiple reference frame (MRF) strategy. Computations are performed in different cases: 7 different relative circumferential angles (Δθ) between the inducer blade trailing edge and the impeller blade leading edge, 3 different axial gaps (G) between the inducer and the impeller. Variation of the hydraulic loss in the rotator is obtained with the change of delta theta. The numerical results show that the pressure generated is minimum in case of (G = 3%D). This indicates that the interference between inducer and impeller is strong if the axial gap is small. The pump performances are predicted and compared to the experimental measurements. The current investigation leads to a thorough enough understanding of the flow characteristics in axial-flow pumps with complex configurations. Recommendations for future modifications and improvements to the pump design are also given.
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Papanicolaou, Elias L., Dietmar Giebert, Rainer Koch, and Achmed Schulz. "A Discretization Approach for Conjugate Heat Transfer and Application to Turbomachinery Flows." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0670.
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Abstract A numerical procedure is presented to simulate conjugate heat transfer in generalized coordinates and used in some typical turbomachinery applications. The discretized equations at the solid-fluid interface are obtained using energy conservation principles and computational nodes are placed exactly on that interface, thus yielding the corresponding temperatures directly, without the need for inter- or extrapolation from neighboring nodes. The temperature field over both the fluid and the solid domains is computed implicitly, i.e., without iterating between the two. The computer code used for the computations is based on the finite-volume method and the SIMPLE algorithm along with various turbulence models. Both a version of the low-Reynolds-number k-ϵ model suitable for recirculating flows with heat transfer and the standard k-ϵ have been used, with suitable modifications. The successful treatment of the boundary condition at the solid-fluid interface has been verified by comparing against analytical solutions for laminar, conjugate heat transfer over a flat plate of finite thickness. The agreement was found to be quite good, when temperature profiles were compared at various streamwise distances from the leading edge. Further applications have been sought in the field of turbomachinery and as the main test case, the turbulent flow and heat transfer in labyrinth seals has been selected. Two such configurations have been considered, a straight-through and a stepped labyrinth seal. Results were compared with measured data obtained for the same configurations and the agreement was found to be satisfactory. In addition, the applicability of the current method to a film-cooling problem and the merits of it are being demonstrated.
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Tiago, Joao, David Dias, and Luis Veiga. "Adaptive Edge Content Delivery Networks for Web-Scale File Systems." In 2022 IEEE 47th Conference on Local Computer Networks (LCN). IEEE, 2022. http://dx.doi.org/10.1109/lcn53696.2022.9843830.
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Barigozzi, Giovanna, Giuseppe Benzoni, and Antonio Perdichizzi. "Boundary Layer and Loss Analysis in a Film Cooled Vane." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0136.
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The paper reports on boundary layer and wake flow analysis in a fully covered, film cooled vane without trailing edge ejection. The investigation, carried out in a low speed wind tunnel for linear cascades, has been mainly focused on the loss generation process due to coolant injection. The investigated region includes the rear part of pressure and suction side boundary layers and the wake region, up to a chord length downstream of the trailing edge. All measurements have been performed at mid-span, air being used as coolant flow. The same measurements have been also performed on a solid blade cascade, i.e. without cooling holes. Boundary layer profiles, integral parameters together with mean and turbulent quantities are presented. It results that the showerhead promotes transition on the suction side, giving rise to a thicker boundary layer all over the surface. On the pressure side, the boundary layer remains laminar up to the trailing edge, as high acceleration prevents transition. The wake region seems not to be strongly altered by the coolant injection. Boundary layer profiles and downstream 5-hole probe traverses have been used to compute loss coefficient distributions all over the blade surface and in the downstream region. Coolant injection strongly increases the profile losses along the suction side, while a much smaller contribution from the pressure side has been found. These increases are mainly due to coolant injection in the vane front part.
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Suo-Anttila, Ahti, K. C. Wagner, and Miles Greiner. "Analysis of Enclosure Fires Using the Isis-3D™ CFD Engineering Analysis Code." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49008.
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The Isis-3D™ computational fluid dynamics (CFD) code is currently under development for the Defense Threat Reduction Agency (DTRA) as a tool for risk assessment and engineering level analysis. It is designed to provide reasonably accurate estimates of the total heat transfer to objects from large fires under a variety of circumstances, predict the medium characteristics such as temperature and species concentration distributions, and use fairly short computer turnaround times. Isis-3D™ models liquid fuel evaporation, transport of fuel vapor, oxygen and other relevant species, reaction and heat release, and soot and other gaseous species formation, destruction, and transport. It models diffuse radiation within the fire and view factor radiation from the fire edge to nearby objects and the surroundings. One-dimensional transient sub-grid modules are also embedded into Isis-3D™. Either or both “ends” of each module are coupled to the flowing medium region, or objects within the three-dimensional medium. These modules allow the code to calculate the one-dimensional response of simple solid objects to the fire environment without affecting the computational fluid dynamics time step. The sub-grid modules can include thermal conduction, convection, momentum, mass, and species exchange. For example, they can be used to simulate the decomposition of organic materials (e.g. burning wood), the evaporation of liquid fuels, and the injection of gases, such as fire suppressants. Fast-running radiation heat transfer and chemical reaction models embedded in the code are designed to enable it to give engineering-level accurate results for large-fire heat transfer even when relatively coarse computational grids are employed. Low to medium level resolution Isis-3D™ simulations (less than 60,000 nodes) are relatively fast running and hence well suited for risk assessments, parametric scenario variations, and engineering level analyses. This paper includes comparisons of Isis-3D™ predictions to two enclosure fire experiments, the classical Steckler room fire experiments and the Sandia National Laboratories (SNL) Igloo enclosure fires. The Steckler fire experiments were steady state fires with a fixed heat input. The SNL Igloo tests were larger scale, unsteady fuel pan fires. Comparisons of the predicted temperature distributions within the enclosures for several tests are shown. A typical application of Isis-3D™ is also illustrated wherein the CO2 fire suppressant distribution within the cable room of a nuclear power plant is predicted as a function of time.
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Krüger, Uwe, Karsten Kusterer, Gernot Lang, Hauke Rösch, Dieter Bohn, and Eckhard Martens. "Analysis of the Influence of Cooling Steam Conditions on the Cooling Efficiency of a Steam-Cooled Vane Using the Conjugate Calculation Technique." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0166.
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Closed circuit steam cooling of blades and vanes in modern gas turbines is an promising alternative instead of film-cooling using compressor air. The temperature drop across the first-stage nozzle, which is convectively steam-cooled, is reduced significantly in comparison to an intensive film-cooled vane using compressor air. Thus, the firing temperature (temperature in front of the first-stage blade row) can be increased while the combustion temperature can remain as low as necessary for low-Nox purpose. In this paper, a steam-cooled test configuration consisting of a 3-vane cascade is numerically analysed. A computer code using a Conjugate Calculation Technique is applied. The CHTflow code has been developed at the Institute of Steam and Gas Turbines in Aachen. Due to the direct coupling of fluid flow and solid body, heat transfer boundary conditions at the external and internal surfaces become unnecessary. Validation of the code for a similar convection-cooled configuration is also given here. The presented investigations focus on the thermal load analysis and the cooling efficiency analysis of the test configuration. It consists of a planar cascade with a convection-cooled central vane where cooling fluid can be supplied to 22 radial passages. One main aspect of the paper is to show the influence of cooling steam conditions (low-, medium & high-pressure steam supply) on the local and global cooling efficiencies. The results show that, for reaching a defined cooling efficiency level, medium steam pressure supply might be advantageous in comparison to a high-pressure level in supply. Although a lower pressure level demands an increase in steam mass flow, the overall effect on the thermal efficiency of the whole process is acceptable if one keeps in mind the advantages of handling steam at lower pressure levels. For further comparison, convective air-cooling with reasonable cooling conditions and comparable flow and heat transfer characteristics is analysed. For the given geometry of the configuration, sufficient cooling of the trailing edge becomes problematic for steam- and air-cooling application.
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Dai, Junjie, Tianpeng Li, Zhaolong Xuan, and Liqing Hu. "Defect Edge Detection on CT Images of the Grain in Solid Rocket Motor." In 2022 IEEE International Conference on Advances in Electrical Engineering and Computer Applications (AEECA). IEEE, 2022. http://dx.doi.org/10.1109/aeeca55500.2022.9919072.
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Mehta, B. V., and R. Marinescu. "Comparison of Image Generation and Processing Techniques for 3D Reconstruction of the Human Skull." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32592.
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Although in the last few years, the use of the non-invasive medical techniques for diagnosis and treatment has experienced a huge development, mainly due to advancement in technology, for research and education these methods are still elaborate, expensive and not readily accessible. The purpose of our study was to compare the accuracy of an unconventional, non-invasive and relatively inexpensive Microscribe (3D digitizer) with a standard widely used and expensive CT-Scan and/or MRI for 3D reconstruction of a human skull, which will be used for biomechanics studies. Two models of the human skull were developed (reconstructed), one using the 3D coordinates generated by the Microscribe 3D digitizing unit and another one using the CT-Scans (2D cross-sections) obtained from a GE scanner. Using the hand-held digitizer, the Microscribe, X, Y and Z coordinates of a human skull were generated to create the first computer model. The 3D coordinates were brought as splines in to 3D Studio Max, a 3D modeling software, and U-lofted to form a solid NURBS model. The Microscribe captures the physical properties of a three-dimensional object and translates them into a 3D model. This kind of device is used to collect data directly from the surface of the study object. The stylus tip is moved over the contour of the object following its surface until the entire surface is digitized. Usually, points are drawn on the object’s surface in order to facilitate the digitizing process. 3D Studio Max takes this “raw” data and produces complex 3D models using various modeling techniques. For making the first skull model a technique called DRAW SPLINES was used. This method allows the user to begin a new spline or to do multiple splines by adding splines to those already created. I used this command to digitize my model because it is easy to use, quick and it gives the most accurate result. The final model was obtained in three steps: half of the skull was digitized and the first object was obtained, the MicroscribeSpline object (Fig. 1). The splines were transformed in NURBS curves and the second object was called NURBS Curves object. Finally, in the third phase, the NURBS curves were transformed in NURBS surfaces using the NURBS surface command, U-LOFT, and the final model, NURBS surface object, was obtained (Fig. 2). The entire skull was obtained from 2 identical halves of the same skull. The model was created using symmetry method because of the model’s organic complexity. The solid model was then exported to FEA software for analysis. (Fig. 3) The second skull model was created using the 2-D cross-sections obtained from the GE Helical Hi Speed - FX/i scanner (Fig. 4). The same skull used in the first part of the study, for modeling the first virtual model, was scanned following both sagittal and frontal planes. The interslice distance was set as being 3 mm. 48 CT slices for every analyzed plane were obtained. The CT cross-sections were captured as DICOM files using the E-film software and exported as TIFF images. The TIFF images were brought into OPTIMAS (image analysis software), which extracted the X, Y coordinates of each cross section using the POINT MORPHOMETRY option. A visual basic program was developed to convert the extracted coordinates to closed curves under Unigraphics SolidEdge software. To obtain the final model, the external boundaries of each cross section were lofted using LOFT PROTRUSION command. To find the best result, a second approach was developed in parallel using Adobe STREAMLINE and image processing software, which extracts the boundaries of each cross section and exports them as DXF files, compatible with the Solid Edge program. Both models were then subjected to stress analysis using Finite Element Analysis software. The analysis results obtained from the two scanning techniques will be discussed and presented, including the pros and cons of using the more accurate and expensive CT-scans versus the inexpensive hand-held scanner and their effects on finite element models. For this study, different image processing software such as OSIRIS, SCION IMAGE, EFILM, 3D DOCTOR, OPTIMAS and STREAMLINE were investigated in order to find the best interface to capture, reconstruct and model body data. The features, availability, cost and user-friendliness of these software tools will also be presented.
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Laskowski, Gregory M., Anil K. Tolpadi, and Michael C. Ostrowski. "Heat Transfer Predictions of Film Cooled Stationary Turbine Airfoils." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27497.
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Conventional heat transfer design methods for high temperature gas turbine airfoils decouple the internal and external flow. Thermal boundary conditions from these decoupled analyses are applied to the blade surfaces to predict turbine life. Typically, the domain for the external flow includes the hot gas path and the film cooling holes while the domain for the internal flow includes the internal flow passages and film cooling holes. The solid blade itself couples the external and internal flow and heat transfer. Since film cooling flow physics can play a significant role on the overall turbine blade heat transfer, there has been increased interest in capturing these effects by including the hole geometry in the solution procedure. Ideally, the complete turbine blade heat transfer analysis would be provided by efficient CFD simulations for the coupled problem including the internal passages, film cooling holes and hot gas path. By prescribing both the external flow and internal flow inflow/outflow boundary conditions, the hole physics can be included in the solution. The current paper presents results obtained for coupled simulations of the NASA C3X vane and VKI rotor which models the internal passages, hole geometries and hot gas path. In both cases, cooling is achieved by rows of pressure-side, leading-edge and suction-side film cooling holes. The rows are independently fed by span-wise, constant area plenums. The former has a total of 152 cylindrical cooling holes whereas the later has a total of 110 cylindrical/shaped holes. In addition, the C3X vane consists of 10 internal radial cooling passages of cylindrical cross-section. The simulations were conducted with the Shear Stress Transport (SST) model on a grid that extended into the viscous sub-layer along all surfaces. The computed surface pressure and external heat transfer coefficient distributions at mid-span are compared to experimental data for both cases. Internal heat transfer predictions are also presented and discussed.
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Rojas-Sola, José Ignacio, Laura García-Ruesgas, and José Porras-Galán. "RECUPERACIÓN GRÁFICA DE LA MÁQUINA EÓLICA PARA DESAGUAR TERRENOS PANTANOSOS DE AGUSTÍN DE BETANCOURT Y MOLINA: MODELADO TRIDIMENSIONAL Y DOCUMENTACIÓN GEOMÉTRICA CON SOLID EDGE." In ARQUEOLÓGICA 2.0 - 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation. Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/arqueologica8.2016.2950.
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Agustín de Betancourt and Molina was one of the most distinguished engineers of the eighteenth and nineteenth century with numerous contributions to various fields of engineering, including civil engineering. This research shows the process followed in the documentation of the cultural heritage of that canary engineer, especially in the geometric documentation of the wind machine to drain marshy grounds designed in 1789. The baseline information has been recovered from the Canary Orotava Foundation of History of Science who has spent years collecting information about the Project Betancourt, in particular, planimetric information as well as a small report on its operation and description of parts of machine. From this information, we have obtained its 3D reconstruction using CAD techniques with the cooperation of Solid Edge ST7 parametric software, which has enabled to obtain the 3D model as well as different detail plans and exploded views.