*HEADING IMPEDANCE PROPERTY [AC2D4R] *************************** *PARAMETER f=100.0 T=5/f omega=2*3.14159*f *************************** *NODE, Nset=ODB_NSET 1, 41,,10. 1001,1. 1041,1.,10. *NGEN,NSET=NALL 1,41 1001,1041 *ELEMENT,TYPE=AC2D4R,ELSET=EALL 1,1,1001,1003,3 *ELGEN,ELSET=EALL 1,20,2,1 *ELSET,ELSET=LINER3 20, *MATERIAL,NAME=AIR *DENSITY 1.293, *ACOUSTIC MEDIUM,BULK MODULUS 1.42176E5, *SOLID SECTION,MATERIAL=AIR,ELSET=EALL *IMPEDANCE PROPERTY,NAME=IMPED 0.0,2.332317E-3 *NSET,NSET=RECRD,GEN 1,41 *NSET,NSET=DRIV 1,1001 ** *NSET, NSET=MID 23, 1023, 33, 1033, 13, 1013 *NSET, NSET=ODB_NSET ODB_NSET, MID ** *AMPLITUDE,NAME=SINE,DEF=PERIODIC 1,,0.0,0.0 0,1,0,0 *STEP *DYNAMIC,EXPLICIT , *BULK VISCOSITY 0.000, *IMPEDANCE,prop=IMPED LINER3,I3 *BOUNDARY, AMP=SINE DRIV,8,,1. *OUTPUT,FIELD,NUM=1 *NODE OUTPUT POR, *OUTPUT,HISTORY,FREQ=1 *NODE OUTPUT,NSET=ODB_NSET POR, *ENDSTEP