Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Based on a mathematical model consisting of a rigid cylindrical body attached to a rigid half plane, the sound pressure on the surface of the cylindrical upper section is actively minimized to divert the tangential power transport along the surface as much as possible. The numerical study considers the possibility of deflecting the incident sound by means of a secondary sound field. The acoustical shadow region becomes more pronounced in both the near and far field, compared with the passive case. For a relatively wide frequency range it is also possible to find optimal arrangements for the secondary sources and for the error microphones. The physical principle studied theoretically can also be realized practically by means of active control. The optimal configurations found in the numerical analysis are proven to be effective in the experiment.
Based on a mathematical model consisting of a rigid cylindrical body attached to a rigid half plane, the sound pressure on the surface of the cylindrical upper section is actively minimized to divert the tangential power transport along the surface as much as possible. The numerical study considers the possibility of deflecting the incident sound by means of a secondary sound field. The acoustical shadow region becomes more pronounced in both the near and far field, compared with the passive case. For a relatively wide frequency range it is also possible to find optimal arrangements for the secondary sources and for the error microphones. The physical principle studied theoretically can also be realized practically by means of active control. The optimal configurations found in the numerical analysis are proven to be effective in the experiment.
Efficiency of Actively Controlled Surface Impedance of Upper Sections Attached to Noise Barriers
Building Acoustics ; 11 ; 115-131
01.06.2004
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Efficiency of Actively Controlled Surface Impedance of Upper Sections Attached to Noise Barriers
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