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  • 1
    Electronic Resource
    Electronic Resource
    Automated laser scanning based on orthogonal cross sections (1996)
    Springer
    Machine vision and applications 9 (1996), S. 106-118 
    Details
    ISSN: 1432-1769
    Keywords: Cross sections ; View point planning ; Multiple view merging ; Automatic sensor placement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract To reversely engineer a clay model or industrial part, a laser scanner is often used to acquire surface data points, which must be processed to created a CAD model. Complete surface definition requires an operator to obtain a number of scans from various viewpoints and orientations. This introduces two difficulties to the reverse-engineering process: (1) the data are difficult to visualize, as scan lines appear at various angles, and (2) the surface is irregularly sampled, with large regions sampled by several scans, and occasionally a small region is missed completely (a result of the visualization problem). We have developed an automated scanning system to overcome these problems. The system utilizes an intermediate data model that consists of three orthogonal cross sections and is built from the triangulated scan data. The resultant model is easily visualized, which facilitates further interactive operation on the data. The system has been successful in autonomously modeling several typical industrial objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01216816
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reverse engineering employing a 3D laser scanner: A case study (1996)
    Springer
    The international journal of advanced manufacturing technology 12 (1996), S. 111-121 
    Details
    ISSN: 1433-3015
    Keywords: Laser scanner ; Reverse engineering ; Surface modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An important step in many manufacturing processes is the definition of the three-dimensional form of an object's shape. A common example is the definition of a designer's model created in clay or wood. A three-dimensional laser scanner offers the advantage of speed and non-contact sensing compared to traditional touch probe sensing. The three-dimensional data produced have been used in a multi-patch reverse engineering program in order to model objects where many types of surface patches, such as quadric and free-form, are blended together on one object. The surface reconstruction algorithms have been demonstrated to provide accurate and smooth surfaces that are suitable for CAD database integration and CNC machine toolpath generation. The algorithms have been implemented in an interactive 3D surface modelling program that produces surfaces compatible with current CAD/CAM systems. The application of the technology to the reverse engineering of a typical injection moulded part is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178951
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Modelling the erosion efficiency of cavitation cleaning jets (1983)
    Springer
    Flow, turbulence and combustion 40 (1983), S. 377-391 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A model is presented of the erosion damage and cleaning efficiency of cavitation and conventional cleaning jets. The effect of supply pressure, jet velocity, standoff distance, nozzle diameter and type of fluid are considered and assessed in relation to experimental findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383042
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Visioplasticity solution of deformation problems: Data handling procedures (1983)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 19 (1983), S. 257-269 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Procedures for smoothing experimentally determined displacement fields are presented such that dynamic, non-steady-state metalworking processes can be analysed using the visioplasticity method. The procedure establishes a rectangular grid in which strain, strain rate and stress values may optionally be obtained at all points on the grid. The condition of material continuity is automatically satisfied by constraints during polynomial smoothing in position and time, using the Gram-Schmidt orthogonalization technique. Examples are given of quasi-static and dynamic plane strain upsetting operations.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620190207
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A finite element and experimental study of rigid-plastic compression (1986)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 23 (1986), S. 1407-1437 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper is concerned with the effect of material properties, boundary friction, and inertia on the flow and strain patterns in material undergoing large plane strain compression. Experimental results are presented for both the rapid compression of Plasticine and the quasi-static compression of aluminium. In addition, a finite element code for rigid-plastic material behaviour is discussed, and approximate procedures are described for both in-plane and platen friction. Provision in the code was also made for strain hardening and strain rate sensitive material properties, and inertia effects. Comparison of the finite element and experimental results showed good agreement. Finite element calculations revealed that in-plane friction had a very significant effect on the strain patterns observed in the Plasticine experiments. Finite element calculations also showed that strain hardening was of fundamental importance in determining the strain patterns that were observed to occur in the quasi-static compression of aluminium.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620230803
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    Paper (German National Licenses)
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