Benchmark
Problems
|
||||||||||||||||
Benchmark Problem A0-4F -Properties-
Geometry: Spherical surface (1 m in diameter) in the free field. Boundary condition: The surface is rigid boundary. A piston source (0.2 m in diameter) (S) is located on the surface of the sphere, assuming its stationary vibration with acceleration amplitude 1.0 m/s2. |
||||||||||||||||
Fig. A0-4F-1:
Geometry of problem A0-4F (unit: m). |
||||||||||||||||
-Task A- Directivity: Sound pressure amplitude [Pa] at 181 points (R1), 2 m away from the sphere's center on the plane x = 0, located at 1 deg intervals (theta = 0, ..., 180 deg). At the octave-band mid-frequencies (f = 31.5, 63, 125, 250, 500, 1k, 2k, 4k Hz). Dataform: d-a0-4fa.xls Contribution:
-Task B- Frequency response: Sound pressure amplitude [Pa] of a total field (the sum of an incident field and a scattered field) at 3 points (0, 0, 1) (R2), (0, 1, 0) (R3) and (0, 0, 10) (R4). At the frequencies with 1 Hz intervals from 20 Hz to 4 kHz; or with 50 Hz intervals from 50 Hz to 4 kHz. Dataform: d-a0-4fb.xls Contribution:
|
||||||||||||||||