Home » Knowledge Base » NVH / Fatigue » BEM acoustics with acoustic transfer vector II
This example shows how to set up an modal acoustic transfer vector (MATV) computation with *FREQUENCY_DOMAIN_ACOUSTIC_BEM_MATV and how to run several loading cases on SSD with *CASE. Post-processing is done with *DATABASE_FREQUENCY_BINARY_D3SSD. Example 8.11 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
Keywords
*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_SOLUTION
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*ELEMENT_SOLID
*END
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_SOLID
*SET_NODE
*SET_NODE_LIST
*SET_SEGMENT
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_MATV
*INCLUDE
*KEYWORD
*CASE_BEGIN_1
*CASE_BEGIN_2
*CASE_BEGIN_3
*CASE_END_1
*CASE_END_2
*CASE_END_3
*DATABASE_FREQUENCY_BINARY_D3SSD
*DEFINE_CURVE
*DEFINE_CURVE_TITLE
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_MATV
*FREQUENCY_DOMAIN_SSD
*INCLUDE
*KEYWORD
*KEYWORD
*CONTROL_IMPLICIT_GENERAL
1 0.000 0 0 0 0 0 0
*CONTROL_IMPLICIT_EIGENVALUE
20 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0
*CONTROL_IMPLICIT_SOLUTION
1 0 0 0.000 0.000 0.000 0.000 0.000
2 1 1 0 2 0
0 0 0.000 1 2
*SET_NODE
1
2849000 2849001
*SET_NODE_LIST
2
2845697 2859262 2845667 2859094 2845637 2858926 2845607 2858758
2845577 2858590 2845205 2858422 2845512 2858179 2845506 2858156
2845507 2858170 2845509 2859349 2845715 2859400 2845708 2859315
2845678 2859147 2845648 2858979 2845618 2858811 2845588 2858643
2845558 2858475 2845464 2857919 2845458 2857901 2844797 2857771
2845401 2857528 2845398 2857542 2845402 2857566 2845408 2857576
2845407 2857552 2845404 2857592 2845412 2857602 2845411 2858172
2845485 2858042 2845461 2857912 2844787 2857782 2845431 2857708
2845430 2857698 2845429 2857724 2845434 2857731 2845433 2857715
2845432 2857745 2845437 2857752 2845436 2857735 2845410 2857583
2844895 2854145 2844894 2854122 2844888 2854098 2844885 2854074
2844883 2854034 2844929 2854024 2844930 2854011 2844931 2856505
2845184 2856265 2845183 2856246 2845190 2856286 2845189 2856270
2845186 2856280 2845194 2856290 2845193 2856238 2845179 2855963
2856337 2854202 2854207 2854200 2854429 2854426 2854450 2854447
2854471 2854468 2854492 2854489 2854513 2854510 2854539 2854537
2844961 2854526 2844956 2854355 2844915 2854376 2844919 2854383
2844916 2854192 2844898 2854154 2844890 2854144 0 0
*BOUNDARY_SPC_SET
2 0 1 1 1 1 1 1
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
0.005000 0 0 0 0
0
*ELEMENT_SOLID
*NODE
*PART
engine_solids
2000657 2000657 2000657
*SECTION_SOLID
2000657 18 0
*MAT_ELASTIC
2000657 2.5400E+3 2.100E+11 0.300000 0.000 0.000 0
*SET_SEGMENT
*END
*KEYWORD
*INCLUDE
8.11.matv.engine.model.k
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_MATV
$# ro c fmin fmax nfreq dt_out t_start pref
1.21 340. 1000. 2000. 3 0.0 20.e-6
$# nsidext typeext nsidint typeint fftwin trslt ipfile iunits
1 1 0 0 4
$# method maxit res ndd tollr tolfct ibdim npg
2 1000 1.E-6 8
$# nbc restrt iedge noel nfrup
1
$# ssid sstype norm bem_type lc1 lc2
1 2 1
*END
*KEYWORD
*INCLUDE
8.11.matv.engine.model.k
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_MATV
1.21 340. 1000. 2000. 3 0.0 20.e-6
1 1 0 0 4
2 1000 1.E-6 8
1 1
1 2 1
*CASE_BEGIN_1
*FREQUENCY_DOMAIN_SSD
1 20 0.000 0.000 1 0
0.020000 0 0 0.000 0.000
1 2 0
2846004 2 0 100
*DEFINE_CURVE
100 0 1.0 1.0 0.0 0.0 0
1000. 1000.
3000. 1000.
*CASE_END_1
*CASE_BEGIN_2
*FREQUENCY_DOMAIN_SSD
1 20 0.000 0.000 1 0
0.020000 0 0 0.000 0.000
1 2 0
2862261 0 2 0 200
*DEFINE_CURVE_TITLE
CurveGen_1
200 0 1.0 1.0 0.0 0.0 0
1000. 2000.
3000. 2000.
*CASE_END_2
*CASE_BEGIN_3
*FREQUENCY_DOMAIN_SSD
1 20 0.000 0.000 1 0
0.020000 0 0 0.000 0.000
1 2 0
2859766 3 0 300
*DEFINE_CURVE_TITLE
CurveGen_1
300 0 1.0 1.0 0.0 0.0 0
1000. 1000.
3000. 1000.
*CASE_END_3
*DATABASE_FREQUENCY_BINARY_D3SSD
1
1000. 2000. 3 0 0
*END
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