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Directionality Patterns for Acoustic Radiation from a Source on a Rigid Cylinder
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1952
Year
Acoustic MethodsAeroacousticsRigid CylinderEngineeringPhysical AcousticAtmospheric AcousticMechanical EngineeringAcoustic PropagationNoiseAcoustic RadiationAcoustical EngineeringSource StrengthSound PropagationUltrasoundAcoustic AnalysisDirectionality Patterns
The directionality patterns produced by an acoustic source located on a rigid cylinder of infinite length have been investigated for the case in which the source strength may be represented as a separable function of azimuth angle and axial dimension. It is observed that the pattern in a plane orthogonal to the axis of the cylinder is independent of the axial distribution of the source, and is, in fact, identical with the pattern given by Morse for a source of infinite axial extent. For the particular case in which the ratio of circumference to wavelength is 14, patterns in this plane have been computed numerically using an IBM Card-Programmed Calculator. Patterns in a plane containing the axis of the cylinder have also been investigated.