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  • 1
    Electronic Resource
    Electronic Resource
    A model for synchronous collaborative design using CAD and database management (1997)
    Springer
    Research in engineering design 9 (1997), S. 85-98 
    Details
    ISSN: 1435-6066
    Keywords: CAD ; Collaboration ; Databases ; Design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Collaborative design is currently supported through the integration of graphical representations with relational databases and the distribution of data and applications across local and wide area networks. Recent developments in computer support for synchronous collaboration have led to the development of multi-user drawing boards and video conferencing software for remote meetings. The extension of CAD for use in a collaborative design session changes the focus of collaborative design from a distribution of data to a shared workspace. Combining CAD with the concept of multi-user software introduces issues of shared visualisation and shared decision making. A model for the integration of CAD and database management in a collaborative design session is presented within a client server architecture, and an implementation of this model using AutoCAD as the shared CAD system is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596484
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  • 2
    Electronic Resource
    Electronic Resource
    Reconsidering algorithms for real parametric curves (1995)
    Springer
    Applicable algebra in engineering, communication and computing 6 (1995), S. 345-352 
    Details
    ISSN: 1432-0622
    Keywords: Real parametric curves ; Parametrizations ; Algorithms ; CAD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract Complex parametric curves have been subject of a symbolic algorithm approach in recent years. In this paper we analyze the theoretical applicability of some of these algorithms to the real parametric curve case. In particular, we show how several results are valid both over the real and the complex numbers, as they hold equivalently over a real curve and its complexification. Therefore, the standard algorithms for the complex case can be applied to obtain real answers in the real case. A second issue in our paper is the study of the very different behaviour of the real parametric mapping and we characterize here the properties of being (almost) injective or surjective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198014
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  • 3
    Electronic Resource
    Electronic Resource
    Tetrachlorosilane Consumption in Radio Frequency Glow Discharge (1998)
    Springer
    Plasma chemistry and plasma processing 18 (1998), S. 509-533 
    Details
    ISSN: 1572-8986
    Keywords: RF SiCl4 discharge ; mass spectrometry ; kinetics ; decomposition ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Time-resolved mass spectrometry was used for analysis of the plasma reactions in radio frequency (RF) SiCl 4 and SiCl 4 −O 2 discharges as functions of starting partial pressure and electrical power. Molecular concentrations of the reactants and products from SiCl 4 alone and with O 2 were obtained from the mass spectra and used for plotting the kinetic curves. The SiCl 4 and O 2 consumption rates were calculated from the kinetic curves and compared with results of theoretical simulation of the reaction. Direct electron impact decomposition was found to be the main pathway for pure SiCl 4 conversion. On the contrary, the consumption of SiCl 4 in the SiCl 4 +O 2 mixtures was largely chemical. The experimental macrokinetics are in agreement with a model in which oxidation is caused by the atomic oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021811316740
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation of Styrene in a Silent Discharge Plasma (1999)
    Springer
    Plasma chemistry and plasma processing 19 (1999), S. 131-151 
    Details
    ISSN: 1572-8986
    Keywords: Styrene ; oxidation ; silent discharge ; plasma ; dielectric barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract A silent discharge plasma reactor has been developed to study the oxidation of styrene vapor in argon/oxygen mixtures. A number of analytical techniques were employed to determine the destruction efficiency and to characterize the intermediate products. The destruction efficiency was measured as a function of initial styrene concentration, temperature, and energy density of the plasma. The formation of solid products was observed in most experiments. At low temperature (100°C), the solid deposit was polymeric in nature, while at high temperature (300°C) the solid appeared to be amorphous carbon. A combination of high temperature and high energy density resulted in high destruction efficiency and minimal production of solid films. The destruction efficiency vs. energy density is shown to be more complex than a simple model predicting exponential behavior. Several reasons for the discrepancy are suggested. The “e-folding” energy density for the destruction of styrene is compared to literature values for other organic compounds, measured using similar types of plasma reactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021812201545
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidation of Dilute Benzene in an Alumina Hybrid Plasma Reactor at Atmospheric Pressure (1999)
    Springer
    Plasma chemistry and plasma processing 19 (1999), S. 383-394 
    Details
    ISSN: 1572-8986
    Keywords: Nonthermal plasma ; benzene ; Al2O3 ; BaTiO3 ; oxidation ; absorption ; atmospheric pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The combination of plasma discharge and adsorption was examined for oxidation of dilute benzene in air in a plasma reactor packed with a mixture of BaTiO 3 pellets and porous Al 2 O 3 pellets (i.e., an alumina hybrid reactor). The oxidative decomposition of benzene was enhanced by the benzene concentrating on the Al 2 O 3 pellets. Furthermore, there was a higher selectivity to CO 2 in the products from the hybrid than from a plasma reactor packed with BaTiO 3 pellets alone. The presence of the Al 2 O 3 pellets suppressed the formation of N 2 O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021820403362
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation and Reduction Processes During NO x Removal with Corona-Induced Nonthermal Plasma (1999)
    Springer
    Plasma chemistry and plasma processing 19 (1999), S. 421-443 
    Details
    ISSN: 1572-8986
    Keywords: Streamer corona ; NO x removal ; nonthermal plasma ; oxidation ; reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract In this paper, the NO-to-NO 2 conversion in various gaseous mixtures is experimentally investigated. Streamer coronas are produced with a dc-superimposed high-frequency ac power supply (10–60 kHz). According to NO x removal experiments in N 2 +NO x and N 2 +O 2 +NO x gaseous mixtures, it is supposed that the reverse reaction NO 2 +O→NO+O 2 may not only limit NO 2 production in N 2 +NO x mixtures, but also increase the energy cost for NO removal. Oxygen could significantly suppress reduction reactions and enhance oxidation processes. The reduction reactions, such as N+NO→N 2 +O, induce negligible NO removal provided the O 2 concentration is larger than 3.6%. With adding H 2 O into the reactor, the produced NO 2 per unit removed NO can be significantly reduced due to NO 2 oxidation. NH 3 injection could also significantly decrease the produced NO 2 via NH and NH 2 - related reduction reactions. Almost 100% of NO 2 can be removed in gaseous mixtures of N 2 +O 2 +H 2 O+NO 2 with negligible NO production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021824504271
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  • 7
    Electronic Resource
    Electronic Resource
    Universal Correlation of Nitrogen 1s and Oxygen 1s Photoelectron Binding Energies with Chemical Composition in Nitrogen-Containing Plasma Polymers (1999)
    Springer
    Plasmas and polymers 4 (1999), S. 283-307 
    Details
    ISSN: 1572-8978
    Keywords: Plasma polymers ; oxidation ; XPS ; photoelectron binding energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The incorporation of oxygen into nitrogen-containing plasma deposited polymers was studied by X-ray Photoelectron Spectroscopy (XPS). As the oxygen content of the plasma polymer increased, the binding energy of the N 1s photoelectrons increased. Conversely, the binding energy of the O 1s photoelectrons was inversely proportional to the nitrogen content of the plasma polymer. The data from a large number of samples all obeyed the same “universal” correlations of photoelectron binding energy versus chemical composition. The data were described by the same curve regardless of whether the oxygen was incorporated rapidly into the thin film during plasma deposition or whether the oxygen was added slowly during spontaneous oxidation of the film in air. This implies that the same thermodynamic principles of radical reactions governed the addition of oxygen to the plasma polymer. The shift in the O 1s and N 1s photoelectron binding energies as a function of chemical composition was used to monitor the proximity of nitrogen and oxygen. By contrasting the experimental data with a simple binomial model which described the random addition of oxygen to a lattice containing carbon and nitrogen, we were able to show that oxygen was preferentially added near nitrogen-containing groups in plasma polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021831527895
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  • 8
    Electronic Resource
    Electronic Resource
    Transforming Engineering Concepts for Technical and Vocational Teacher Education (1997)
    Springer
    International journal of technology and design education 7 (1997), S. 181-201 
    Details
    ISSN: 1573-1804
    Keywords: teacher education in the technical and vocational fields ; models ; electronics ; automatisms ; CAD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Art History , Education , Technology
    Notes: Abstract Technical education involves programmes, disciplines, but also a level of competence to be reached by students, in reference to social practices outside of school. Technical teacher education must not only include competence in these social practices but must also develop specific, practical teaching skills. Today a rapid evolution in academic disciplines has been observed, partially linked to the circulation of models. the present study is concerned with the transformation of models within these exchanges and attempts to extract knowledge that would be useful for decisions to be made concerning teacher education.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008888331778
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  • 9
    Electronic Resource
    Electronic Resource
    GC 1 multisided Bézier surfaces (1997)
    Springer
    Engineering with computers 13 (1997), S. 222-234 
    Details
    ISSN: 1435-5663
    Keywords: Biquintic Bézier patches ; CAD ; CAGD ; CAM ; G 1 continuity ; GC 1 andGC 2 modifications ; GC 1 surface simplexes ; Multisided surfaces ; Twistcompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract This paper presents a new method for generating a tangent-plane continuous (GC1) multisided surface with an arbitrary number of sides. The method generates piecewise biquintic tensor product Bézier patches which join each other with G1-continuity and which interpolate the given vector-valued first order cross-derivative functions along the boundary curves. The problem of the twist-compatibility of the surface patches at the center points is solved through the construction of normal-curvature continuous starlines and by the way the twists of surface patches are generated. This avoids the inter-relationship among the starlines and the twists of surface patches at the center points. The generation of the center points and the starlines has many degrees of freedom which can be used to modify and improve the quality of the resulting surface patches. The method can be used in various geometric modeling applications such as filling n-sided holes, smoothing vertices of polyhedral solids, blending multiple surfaces, and modeling surface over irregular polyhedral line and curve meshes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200049
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  • 10
    Electronic Resource
    Electronic Resource
    Behavior modeling in mechanical engineering — A modular approach (1998)
    Springer
    Engineering with computers 14 (1998), S. 185-196 
    Details
    ISSN: 1435-5663
    Keywords: CAD ; Feature ; Finite element modeling ; Order-based design ; Physical behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Many engineering activities are confronted with the relation between shape and behavior. Modern ‘state-of-the-art’ CAD systems can support a dynamic design process with flexible and umambiguous geometric modeling of artifacts. The Finite Element (FE) method is a general method to model and simulate physical behavior. CAD and FE integration enables numerical prediction of the physical behavior of artifacts. To deal with the complexity of modern products and the dynamic character of the design process, the integration must be addressed from both a systems and a process point of view. The models must thus be flexible, scalable, and reusable. A modularized modeling approach based on four stages is proposed, and exemplified with behavior modeling of a turn-key grinding machine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01215972
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  • 11
    Electronic Resource
    Electronic Resource
    A critical review of General Design Theory (1995)
    Springer
    Research in engineering design 7 (1995), S. 1-18 
    Details
    ISSN: 1435-6066
    Keywords: Design theory ; Mathematical theory ; Topology, model of design ; Computer-aided design ; CAD ; Modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract This study is a critical review of General Design Theory (GDT), a mathematical theory of design. It reviews the assumptions (axioms) and predictions (theorems) of GDT with respect to design and illustrates them with simple examples. The scope of GDT with respect to design, the guidelines it provides for building computer-aided design (CAD) systems, and the possibility of implementing these guidelines are examined. GDT assumptions are too restrictive to apply directly to design, and several potential avenues for modifying the theory to attempt to broaden its scope are discussed. Nevertheless, these modifications may not lead to proving strong predictions about design. Treating GDT as a model, rather than as an accurate reflection of design, allows treating the guidelines as hypotheses to be tested empirically. The article discusses these guidelines and some experimental implementations that embody some of them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01681909
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  • 12
    Electronic Resource
    Electronic Resource
    Automated manufacturability analysis: A survey (1997)
    Springer
    Research in engineering design 9 (1997), S. 168-190 
    Details
    ISSN: 1435-6066
    Keywords: CAD ; Concurrent engineering ; Design for manufacturing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract In the market-place of the 21st century, there is no place for traditional ‘over-the-wall’ communications between design and manufacturing. In order to ‘design it right the very first time’, designers must ensure that their products are both functional and easy to manufacture. Software tools have had some successes in reducing the barriers between design and manufacturing. Manufacturability analysis systems are emerging as one such tool — enabling identification of potential manufacturing problems during the design phase and providing suggestions to designers on how to eliminate them. In this paper, we provide a survey of current state-of-the-art automated manufacturability analysis. We present the historical context in which this area has emerged and outline characteristics to compare and classify various systems. We describe the two dominant approaches to automated manufacturability analysis and overview representative systems based on their application domain. We describe support tools that enhance the effectiveness of manufacturability analysis systems. Finally, we attempt to expose some of the existing research challenges and future directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596601
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  • 13
    Electronic Resource
    Electronic Resource
    Adaptive and variant design of rotational connections (1995)
    Springer
    Engineering with computers 11 (1995), S. 83-93 
    Details
    ISSN: 1435-5663
    Keywords: Rotational connection ; Large-diameter rolling bearing ; CAD ; Variant design ; Adaptive design ; Technical documentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract When producing technical documentation for rolling rotational connections, more time is used for drawing preparation than for actual problem-solving. The major share of element development is made using adaptive or variant design methods. Computer support can shorten the time needed. The designer must be careful not to lose the overview of the problem. Efficient CAD systems should provide the designer with: a high degree of creative work, possibility of adaptations of form, technology and regulations over wide limits, and high reliability and constant control over the design process. This paper studies the possibilities of the design process methods related to the capabilities of such an ‘intelligent’ CAD system used for the design of rotational connections and workshop documentation for the purposes of manufacture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312202
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  • 14
    Electronic Resource
    Electronic Resource
    An integrated system for computer aided design and analysis of multibody systems (1996)
    Springer
    Engineering with computers 12 (1996), S. 23-33 
    Details
    ISSN: 1435-5663
    Keywords: CAD ; Database ; Multibody system analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract An integrated system for design and analysis of multibody systems has been developed and is described in this paper. The use of the system is demonstrated through the example provided. The system consists of a commercially available CAD program and a multibody system analysis code developed at the Royal Institute of Technology in Stockholm, These tools are integrated using a relational database, the structure of which was developed at Luleå University of Technology, in order to get a complete system for design and analysis of multibody systems. The main gains from the integrated system are the possibilities of using calculated component data like mass and moment of inertia from the CAD program in the simulation models, the automatic formulation of input files for the analysis code, and finally the visualization of simulation results using the surface data of the solid models. The interactive structured query language (ISQL) of the database management system provides the possibility of examining the components of the multibody system during the design work and before any simulation is performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200259
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  • 15
    Electronic Resource
    Electronic Resource
    The product data model as a pool for CAD-FEA data (1998)
    Springer
    Engineering with computers 14 (1998), S. 115-122 
    Details
    ISSN: 1435-5663
    Keywords: CAD ; FEA ; Product Data Modeling ; STEP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract CAD-FEA coupling has been the subject of research for a long time. Initially developed with the aim of connecting single applications, requirements due to the interfaces rose along with increasing application of computer-aided methods in product development. The introduction of the termproduct data model in combination with object-oriented technology, allowed progressive work towards the integration of product data. First results have been given in form of a standardized product data model called STEP (ISO 10303) to serve for CAE product data exchange. The authors have had the opportunity to examine the data model introduced by STEP in general and depicting the CAD-FEA connection as well as to implement a prototype STEP interface. The article first presents some fundamentals of product data modeling and related aspects of design and analysis product data, then gives a survey of the case study being done in CAD-FEA coupling with STEP and in conclusion sketches the concept of an object-oriented CAD-FEA integration model to allow for bidirectional and process conform data exchange.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01213585
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