Fraunhofer-Forschungsgruppe Hydroakustik FHAK

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  • Publication
    Directivity pattern of a cantilever plate. Comparison of numerical results with experimental data
    ( 1991)
    Homm, A.
    ;
    Bartels, F.
    ;
    Estorff, O. von
    For a cantilever aluminium plate, the vibration modes were investigated experimentally by means of the Chladni method and numerically with the FE-method (NASTRAN). The sound radiation of three selected eigenfrequencies was determined by the reciprocity method and was calculated with a coupled FEM/BEM-approach. The comparison of the experimental and numerical results shows excellent agreement.
  • Publication
    Richtcharakteristik einer einseitig eingespannten ebenen Platte
    ( 1991)
    Homm, A.
    ;
    Ganser, A.
    ;
    Bartels, F.
    Experiments on vibration and sound radition of a cantilever aluminium plate were carried out. For 3 eigenfrequencies the mode shapes were visualized by the Chladni method and the directivity patterns of the radiated sound were determined by the reciprocity method. The directivity patterns could be measured for nearly the whole of all directions in a 2 degree step resolution are represented in a 3-dimensional hidden line technique.
  • Publication
    Finite element calculation of vibration modes of clamped propeller blades
    ( 1991)
    Homm, A.
    ;
    Bartels, F.
    The study presents results of numerical FE- calculations for modern skew propeller blades and their experimental validation. It is restricted to single clamped blades, an assumption easy to implement in the theoretical calculation but difficult to achieve in an experiment. Assumptions for the FE- calculations and the incomplete rigid clamped boundary condition in the experiment yield differences between experiment and theory, mainly in the eigenfrequencies. The fluid coupling to the structure is limited to the inviscid, incompressible case or k 1 << 1. In the limits of these assumptions the results of both, theory and experiments agree fairly.
  • Publication
    Ergebnisse einer theoretischen und experimentellen Modalanalyse von Propellern
    ( 1988)
    Bartels, F.
    Bestimmung der Eigenmoden für Schiffspropeller. Zunächst wird die dynamische Strukturanalyse an einzelnen eingespannten Flügelblättern behandelt. Numerische FE-Rechnungen werden mit experimentellen Ergebnissen verglichen. Ergebnisse von experimentellen Untersuchungen bezüglich der Kopplung der Nabe bei mehrflügeligen Propellern werden diskutiert. (FHAK)