In order to better understand the underlying physics, the sound
pressure distribution at two unaffected resonances is investigated.
Choosing 942 Hz as an example, dominated by mode (2, 0, 1), a
cross-sectional view of the sound pressure distribution within
the two domains is displayed in Fig. 4(a). It can be seen that the
two acoustic domains exhibit the same wave pattern in the circumferential
direction. Indeed, by virtue of the coaxiality and the
equal length of the two acoustic domains, the sound pressure fields
on both sides of MPP are dominated by the modes having the same
In order to better understand the underlying physics, the soundpressure distribution at two unaffected resonances is investigated.Choosing 942 Hz as an example, dominated by mode (2, 0, 1), across-sectional view of the sound pressure distribution withinthe two domains is displayed in Fig. 4(a). It can be seen that thetwo acoustic domains exhibit the same wave pattern in the circumferentialdirection. Indeed, by virtue of the coaxiality and theequal length of the two acoustic domains, the sound pressure fieldson both sides of MPP are dominated by the modes having the same
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