Two-Way Radio User Manual

*
IMPEDANCE PROPERTY
Data lines to define an impedance using DATA=ADMITTANCE (default):
First line:
1. , the proportionality factor between pressure and displacement of the surface in the normal
direction. This quantity is the imagi nary part of the complex admittan ce, divided by the angular
frequency; see “Acoustic loads,” Section 27.4.5 of the ABAQUS Analysis User’s Manual.
(Units of F
−1
L
3
.)
2.
, the proportionality factor be tween pressure and velocity of the surface in the normal
direction. This quantity is the real part of the com plex admittance. (Units of F
−1
L
3
T
−1
.)
3. Frequency. (Cycles/time.) Frequency dependence is active only during frequency domain
analysis in ABAQUS/Standard.
Repeat this data line as often as necessary in ABAQUS/Standard to describe the variation of the
coefficients with frequency. Only the first line entered will be used in direct-integration procedures.
Data lines to define an impedance using DATA=IMPEDANCE:
First line:
1. , the real part of the surface im pedance. (Units of F L
−3
T.)
2.
, the imaginary part of the surface impedance. (Units of F L
−3
T.)
3. Frequency. (Cycles/time.) Frequency dependence is active only during frequency domain
analysis in ABAQUS/Standard.
Repeat this data line as often as necessary in ABAQUS/Standard to describe the variation of the
coefficients with frequency. Only the first line entered will be used in direct-integration procedures.
9.2–2
ABAQUS Version 6.1 Module:
ID:
Printed on: