摘要：The thickness noise predicted by the Ffowcs Williams and Hawkings
(FW&H) equation depends on the normal velocity 𝑣𝑛 which is very sensitive
to the meshing size. Isom showed that in far field a monopolar source is
equivalent to a dipolar source induced by a uniform distribution of the
load on the entire moving surface. The main objective of this paper is
to determine a specific expression of Isom's thickness noise in time and
frequency domains for subsonic fans. The scope of the proposed expression
of Isom's thickness noise is to define a benchmark test of consistency for
thickness and loading noise codes in both time and frequency domains for
subsonic fans when using the free field solution of FW&H's equation.
