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Benchmark Problem A1-2F

-Properties-
category
type
index
domain
object
note
A. exterior
1. practical
A1-2F
frequency
diffuser
scattering

Geometry:
Trimmed diffuser (3.0 m * 4.5 m * 0.22 m) in the free field.

Boundary condition:
All faces are rigid boundaries.; A point source (S) is located at (-10.6, 0.0, 10.6), assuming its stationary vibration with volume acceleration amplitude 1.0 m3/s2.
Fig. A1-2F-1: Geometry of problem A1-2F (unit: m).
-Task A-

Directivity:
Sound pressure amplitude [Pa] at 181 points , 11.25 m away from the panel's center on the plane y = 0.0, located at 1 deg intervals (theta = 0, 1, 2, ..., 180 deg). At the octave-band mid-frequencies (f = 31.5, 63, 125, 250, 500, 1k, 2k, 4k Hz).

Dataform:
d-a1-2fa.xls



Contribution:

  • [06/08/22] A1-2FA-03: Fast Multipole BEM (Burton-Miller method), Kosaka, Y.
  • [06/08/22] A1-2FA-02: Fast Multipole BEM (Normal Derivative Form), Kosaka, Y.
  • [06/08/22] A1-2FA-01: Fast Multipole BEM (Basic Form), Kosaka, Y.
-Task B-

Frequency response:
Sound pressure amplitude [Pa] at R1. At the frequecies with 1 Hz intervals from 20 Hz to 4 kHz; or with 50 Hz intervals from 50 Hz to 4 kHz.

Dataform:
d-a1-2fb.xls
-Task C-

Scattering coefficient:
Under Construction