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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 7 (1974), S. 195-199 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Abstract A programme is demonstrated which apart from linear finite elements in time also includes elements with shape functions of the second and third degree. The algorithm for discretization in the time dimension is described and, using the example of a parabolic time element, the coefficients required to form the element matrices are given. A parabolic alteration within a time element is taken into consideration for the boundary conditions, this being of special importance in reproducing periodic processes. On the basis of certain test examples the efficiency of the process is examined by comparison with the customary mean difference method.
    Notes: Zusammenfassung Es wird ein Rechenprogramm vorgestellt, das neben linearen finiten Elementen in der Zeit auch Elemente mit Ansatzfunktionen 2ten und 3ten Grades beinhaltet. Der Algorithmus zur Diskretisierung in Zeitdimension wird beschrieben und am Beispiel eines parabolischen Zeitelementes werden die zur Bildung der Elementmatrizen notwendigen Koeffizienten angegeben. Für die Randbedingungen wurde dabei eine parabolische Änderung innerhalb eines Zeitelementes berücksichtigt, was von besonderer Bedeutung bei der Nachbildung periodischer Vorgänge ist. An Hand einiger Testbeispiele wird die Effizienz des Verfahrens durch Vergleich mit dem gebräuchlichen MittelDifferenzenverfahren untersucht.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 15 (1980), S. 1507-1515 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The method of initial strain is replaced by a method of initial displacements and applied to simple four-noded membrane and shell elements. The thermal stresses in nodes are improved for quadrilaterals and hexahedrons, which have a discrepancy between interpolation functions for temperature (linear) and strains (constant). To get initial displacements, the singular element stiffness matrix has to be inverted. Minor changes in subroutine MINV3 (enclosed version STDMNV) were made to do this.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 8 (1974), S. 625-631 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A program is demonstrated which apart from linear finite elements in time also includes elements with shape functions of the second and third degree. The algorithm for discretization in the time dimension is described and, using the example of a parabolic time element, the coefficients required to form the global system are given. By various test examples the efficiency of the process is examined by comparison with the customary difference method. Generally, with finite elements in time, the solution has better stability. Comparing the time required for calculation with the accuracy of the solution it would appear that in examining problems where boundary conditions are constant in time, higher order time elements are no improvement over the linear time element. However, for the purpose of reproducing periodic processes, higher order time elements offer an advantage in that one is not limited to linear variations of the boundary conditions within the element. Thus, for example, the temperature curve for parabolic variation of the surface temperature can be reproduced with close approximation by two time elements per period and a shape function of the third degree.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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