Abaqus Volume II: I–Z Uživatelský manuál stáhnout pdf (Strana 23)

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101

IMPEDANCE

9.1

IMPEDANCE: Deﬁne impedances for acoustic analysis.

This option is used to provide boundary impedances or nonreﬂecting boundaries for acoustic and coupled

acoustic-structural analyses.

Products: ABAQUS/Standard ABAQUS/Explicit

Type: History data

Level: Step

References:

•

“Acoustic, shock, and coupled acoustic-structural analysis,” Section 6.9.1 of the ABAQUS A nalysis

User’s Manual

•

“Acoustic loads,” Section 27.4.5 of the ABAQUS Analysis User’s Manual

• *

IMPEDANCE PROPERTY

• *

SIMPEDANCE

Required, mutually exclusive parameters:

PROPERTY

Set this parameter equal to the name of the

IMPEDANCE PROPERTY option deﬁning the table

of impedance 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 dimen sions or a right circular cylinde r in three dimensions.

Set NONREFLECTING=SPHERICAL to specify a radiation condit ion appropria te for a

spherical boundary.

Set NONREFLECTING=ELLIPTICAL to specify a radiation condition appropriate for an

elliptical boundary in two dimensions or a right elliptical cylinder in three di mensions.

Set NONREFLECTING=PROLATE SPHEROIDAL to specify a radiation condition

appropriate for a prolate spheroidal boundary.

9.1–1

ABAQUS Version 6.1 Module:

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Abaqus Volume II: I–Z Uživatelský manuál Strana 23

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