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SIMPEDANCE
18.17
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SIMPEDANCE: Define impedances of acoustic surfaces.
This option is used to provide surface impedance information or nonreflecting boundaries for acoustic and
coupled acoustic-structural analysis.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: History data
Level: Step
References:
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“Acoustic, shock, and coupled acoustic-structural analysis,” Section 6.9.1 of the ABAQUS A nalysis
User’s Manual
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“Acoustic loads,” Section 27.4.5 of the ABAQUS Analysis User’s Manual
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IMPEDANCE
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IMPEDANCE PRO PERTY
Required, mutually exclusive parameters:
PROPERTY
Set this parameter equal to the name of the
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IMPEDANCE PROPERTY option defining the table
of im pedance values to be used.
NONREFLECTING
Set NONREFLECTING=PLANAR (default) to specify the impedance corresponding to that of a
normal incidence plane wave.
Set NONR EFLECTING=IMPROVED to specify the impedance corresponding to that of
a plane wave at an arbitrary angle of incidence. This parameter can be used only for transient
dynamics.
Set NONREFLECTING=CIRCULAR to specify a radiation condition appropriate for a
circular boundary in two dim ensions or a right circular cylinder in thre e dimensions.
Set NONREFLE CTING=SPHERICAL to specify a radiation cond ition appropriate for a
spherical boundary.
Set NONREFLECTING=ELLIPTICAL to specify a radiation condition appropriate for an
elliptical bounda ry in two dimensions or a right elliptical cylinder in three dimensions.
Set NONREFLECTING=PROLATE SPHEROIDAL to specify a radiation condition
appropriate for a prolate spheroidal boundary.
18.17–1
ABAQUS Version 6.1 Module:
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