*HEADING
 1D transient wave propagation, acoustic medium, incident wave
 load and incident wave reflection, planar and defined through
 pressure amplitude
**
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=NO
*NODE,NSET=BRICK
*NSET,NSET=PLATE
*ELEMENT,TYPE=AC3D8R,ELSET=ACOUSTIC
**************************
*SURFACE,NAME=ABSORB
1,S2
*SURFACE,NAME=IW_LOAD
1,S1
**************************
*SOLID SECTION,MATERIAL=AIR,ELSET=ACOUSTIC
*MATERIAL,NAME=AIR
*DENSITY
 1.,
*ACOUSTIC MEDIUM,BULK MODULUS
**************************
*INCIDENT WAVE PROPERTY,NAME=IWPROP,TYPE=PLANE
*INCIDENTWAVE FLUID PROPERTY
*AMPLITUDE,DEFINITION=periodic,NAME=PRESSUREVTIMESINE
1,350.0,0.0,0.0
0.0,1.0
*AMPLITUDE,DEFINITION=tabular,NAME=PRESSUREVTIMESTEP
0.0,0.0,0.01,1.0
**************************
*IMPEDANCE PROPERTY,NAME=IRPROP
**************************
*STEP
*DYNAMIC,EXPLICIT,DIRECTUSERCONTROL
0.0001,0.06
**
*SIMPEDANCE
 ABSORB,
*INCIDENTWAVE,PRESSUREAMPLITUDE=PRESSUREVTIMESTEP,PROPERTY=IWPROP
IW_LOAD,1.0
**
*INCIDENT WAVE REFLECTION
**
*OUTPUT,FIELD,NUMBERINTERVAL=1
*NODE OUTPUT,NSET=BRICK
POR,
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT,NSET=PLATE
POR,
**
*END STEP
*STEP
*DYNAMIC,EXPLICIT,DIRECTUSERCONTROL
0.0001,0.09
**
*SIMPEDANCE
 ABSORB,
*INCIDENTWAVE,PRESSUREAMPLITUDE=PRESSUREVTIMESTEP,PROPERTY=IWPROP
IW_LOAD,-3.0
**
*INCIDENT WAVE REFLECTION
**
*END STEP