By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Vibration and Acoustics. According to news originating from Lyngby, Denmark, by VerticalNews correspondents, research stated, "The far field velocity potential and radiation pattern of baffled circular plates and membranes are found analytically using the full set of modal velocity profiles derived from the corresponding equation of motion. The derivation is valid for a plate or membrane subjected to an external excitation force, which is used as a sound receiver in any medium or as a sound transmitter in a gaseous medium."
Our news journalists obtained a quote from the research from the Technical University of Denmark, "A general, concise expression is given for the radiation pattern of any mode of the membrane and the plate with arbitrary boundary conditions. Specific solutions are given for the four special cases of a plate with clamped, simply supported, and free edge boundary conditions as well as for the membrane. For all non-axisymmetric modes, the velocity potential along the axis of the radiator is found to be strictly zero. In the long wavelength limit, the radiation pattern of all axisymmetric modes approaches that of a monopole, while the non-axisymmetric modes exhibit multipole behavior."
According to the news editors, the research concluded: "Numerical results are also given, demonstrating the implications of having non-axisymmetric excitation using both a point excitation with varying eccentricity and a homogeneous excitation acting on half of the circular radiator."
For more information on this research see: Modal radiation patterns of baffled circular plates and membranes. Journal of the Acoustical Society of America, 2014;135(5):2523-2533. Journal of the Acoustical Society of America can be contacted at: Acoustical Soc Amer Amer Inst Physics, Ste 1 No 1, 2 Huntington Quadrangle, Melville, NY 11747-4502, USA. (Acoustical Society of America - acousticalsociety.org/; Journal of the Acoustical Society of America - asadl.org/jasa/)
The news correspondents report that additional information may be obtained from T.L. Christiansen, Technical University of Denmark, Center Individual Nanoparticle Funct, DK-2800 Lyngby, Denmark. Additional authors for this research include O. Hansen, E.V. Thomsen and J.A. Jensen.
Keywords for this news article include: Lyngby, Europe, Denmark, Vibration and Acoustics
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