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  • 11
    ISSN: 1572-9648
    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: Summary The dimensional synthesis of a four bar linkage for function generation, usually performed by considering only kinematic characteristics of the mechanism, may be improved by accounting also for its dynamical behavior. In the present study the maximum values of velocity and acceleration are controlled in order to limit the inertial forces, as required in the design of high-speed mechanisms. At this purpose an optimization technique, based on penalty function method, has been adopted. Several numerical results for different choices for constraints and initial design are presented and discussed.
    Notes: Sommario Il problema della sintesi dimensionale di un quadrilatero articolato per la generazione di funzioni assegnate può essere risolto in maniera completa tenendo conto non solo delle caratteristiche cinematiche del meccanismo ma anche di alcuni aspetti dinamici del suo funzionamento. In particolare nel presente studio si considerano le velocità ed accelerazioni di alcuni membri del meccanismo controllandone i valori massimi al fine di limitare l'entità delle forze d'inerzia. Questo problema di sintesi, che assume particolare importanza nel progetto di meccanismi ad altre velocità è risolto mediante una tecnica di ottimizzazione del tipo della funzione di penalità. Si presentano alcuni risultati numerici relativi a differenti condizioni di vincolo e di progetto iniziale.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 1285-1298 
    ISSN: 0271-2091
    Keywords: Navier-Stokes equations ; Vorticity-velocity ; Multiconnected domains ; Pressure single-valuedness ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The thermofluid dynamic fields in two-dimensional multiconnected domains are analysed by solving the Navier-Stokes equations with the Boussinesq approximation in the vorticity-velocity formulation. The need of an integral condition for the pressure to be single-valued on each independent irreducible loop, in analogy with the ω-Ψ formulation, is demonstrated. The field equations are discretized by a finite difference technique and solved at the steady state via an alternating direction implicit method of a scalar type. Two test cases at low Reynolds and Rayleigh numbers are considered: the multiconnected driven cavity and an annulus with isothermal walls and stationary or rotating inner cylinder.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 405-416 
    ISSN: 0271-2091
    Keywords: Navier-Stokes equations ; Vorticity-velocity ; Finite difference ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical method for computing high-Re laminar steady flows is presented. The incompressible Navier-Stokes equations are expressed in terms of vorticity-velocity variables, discretized in space by finite differences on a staggered grid and advanced in time by a scalar alternating direction implicit (ADI) procedure, which allows a fully vectorized computer code. The accuracy and efficiency of the present formulation are discussed in comparison with the standard ω-ψ and u, v, P forms. Numerical results are presented for two test cases: the driven cavity at Re up to 5000 and the backward-facing step at Re up to 800.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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