*HEADING FULLY COUPLED ACOUSTIC ANALYSIS OF A MUFFLER, EXPLICIT ** ** This input file needs the following files: ** **muffler_intair_nodes_xpl.inp **muffler_intair_elem_xpl.inp **muffler_shell_nodes.inp **muffler_shell_elem.inp **muffler_extair_nodes_xpl.inp **muffler_extair_elem_xpl.inp **muffler_extair_elem_ainxpl.inp ** ** It is recommended to run the analysis ** in DOUBLE PRECISION !!! ** ** PART INSTANCE: INTERIORAIR-1 ** *Parameter f=180.0 T=1.0/f omega=2*3.14159*f *NODE,INPUT=muffler_intair_nodes_xpl.inp *ELEMENT,TYPE=AC3D4,INPUT=muffler_intair_elem_xpl.inp ** ------------------------------------------- *ELSET,ELSET=INTERIORAIR-1_I1,GENERATE 549, 1457, 1 *SOLID SECTION,ELSET=INTERIORAIR-1_I1,MATERIAL=AIRABSORB 1., ** ------------------------------------------- *ELSET,ELSET=INTERIORAIR-1_I2,GENERATE 1, 548, 1 *SOLID SECTION,ELSET=INTERIORAIR-1_I2,MATERIAL=AIR 1., ** ------------------------------------------- ** ** PART INSTANCE: MUFFLERSHELL-1 ** *NODE,INPUT=muffler_shell_nodes.inp *ELEMENT,TYPE=S4R,INPUT=muffler_shell_elem.inp ** ------------------------------------------- *ELSET,ELSET=MUFFLERSHELL-1_I1,GENERATE 1458, 1500, 1 *SHELL SECTION,ELSET=MUFFLERSHELL-1_I1,MATERIAL=STEEL 0.00075, 5 ** ------------------------------------------- ** ** PART INSTANCE: OUTERAIR-1 ** *NODE,INPUT=muffler_extair_nodes_xpl.inp *INCLUDE,INPUT=muffler_extair_elem_ainxpl.inp ** ------------------------------------------- *SOLID SECTION,ELSET=OUTERAIR-1_I1,MATERIAL=AIR 1., ** ------------------------------------------- *NSET,NSET=SHELLSYM,UNSORTED 3301,3376,3375,3299,3373,3297,3340,3339,3338, 3337,3336,3335,3334,3333,3332,3331,3330,3329, 3328,3327,3326,3325,3324,3323,3322,3321,3320, 3319,3318,3317,3316,3315,3314,3313,3312,3311, 3310,3309,3295,3307,3292,3304,3303,3291 ** ------------------------------------------- *NSET,NSET=SHELLCONSTRAINT,UNSORTED 3302,3377,3378,3300,3374,3298,3341,3342,3343, 3344,3345,3346,3347,3348,3349,3350,3351,3352, 3353,3354,3355,3356,3357,3358,3359,3360,3361, 3362,3363,3364,3365,3366,3367,3368,3369,3370, 3371,3372,3296,3308,3293,3305,3306,3294 ** ------------------------------------------- *NSET,NSET=SHELLDISP 3304,3325,3375 ** ------------------------------------------- *NSET,NSET=CENTERLINE 10, 11, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890 ** ------------------------------------------- *NSET,NSET=INLETPRESSURE 11, 12, 13, 177, 186, 618, 891, 892, 893, 913, 914, 915 ** ------------------------------------------- *ELSET,ELSET=INNERAIROUTLET_S4 288, 299, 367 *SURFACE,NAME=INNERAIROUTLET INNERAIROUTLET_S4, S4 ** ------------------------------------------- *ELSET,ELSET=INNERAIR2SHELL_S1 367, 374, 384, 385, 386, 387, 388, 392, 393, 894, 895, 896, 1192, 1195, 1196, 1197, 1198, 1201, 1202, 1203, 1210, 1213, 1214, 1216, 1237, 1238, 1239, 1240, 1243, 1248, 1250, 1330, 1331, 1334, 1337, 1341, 1359 *ELSET,ELSET=INNERAIR2SHELL_S4 370, 373, 375, 380, 383, 391, 559, 634, 894, 895, 1193, 1194, 1200, 1204, 1206, 1208, 1211, 1212, 1215, 1217, 1235, 1242, 1244, 1246, 1247, 1249, 1251, 1276, 1298, 1320, 1321, 1322, 1323, 1326, 1329, 1335, 1336, 1338, 1340, 1343, 1347, 1349 *ELSET,ELSET=INNERAIR2SHELL_S2 379, 592, 635, 858, 917, 1199, 1205, 1209, 1236, 1241, 1252, 1253, 1254, 1325, 1339, 1344, 1345, 1346, 1348, 1350, 1351, 1352, 1353, 1354, 1355, 1356, 1357, 1358, 1360, 1361, 1362 *ELSET,ELSET=INNERAIR2SHELL_S3 377, 378, 389, 390, 557, 560, 561, 568, 683, 888, 897, 1207, 1245, 1277, 1324, 1327, 1328, 1332, 1333, 1342, 1387, 1388 *SURFACE,NAME=INNERAIR2SHELL INNERAIR2SHELL_S1, S1 INNERAIR2SHELL_S4, S4 INNERAIR2SHELL_S2, S2 INNERAIR2SHELL_S3, S3 ** ------------------------------------------- *ELSET,ELSET=SHELL2INNERAIR_SNEG,GENERATE 1458, 1500, 1 *SURFACE,NAME=SHELL2INNERAIR SHELL2INNERAIR_SNEG, SNEG *ELSET,ELSET=SHELL2OUTERAIR_SPOS,GENERATE 1458, 1500, 1 *SURFACE,NAME=SHELL2OUTERAIR SHELL2OUTERAIR_SPOS, SPOS ** ------------------------------------------- *ELSET,ELSET=OUTERAIR2SHELL_S6 2100,2116,2420 *ELSET,ELSET=OUTERAIR2SHELL_S3 2100,2420,2421,2422 *ELSET,ELSET=OUTERAIR2SHELL_S4,GENERATE 1519, 1975, 19 *SURFACE,NAME=OUTERAIR2SHELL OUTERAIR2SHELL_S6, S6 OUTERAIR2SHELL_S3, S3 OUTERAIR2SHELL_S4, S4 ** ------------------------------------------- *ELEMENT, TYPE=ACIN3D4, ELSET=INF 101519,4692,3380,3406,4718 101520,4718,3406,3586,4898 101538,4898,3586,3604,4916 101557,4916,3604,3622,4934 101576,4934,3622,3640,4952 101595,4952,3640,3658,4970 101614,4970,3658,3676,4988 101633,4988,3676,3694,5006 101652,5006,3694,3712,5024 101671,5024,3712,3730,5042 101690,5042,3730,3748,5060 101709,5060,3748,3766,5078 101728,5078,3766,3784,5096 101747,5096,3784,3802,5114 101766,5114,3802,3820,5132 101785,5132,3820,3838,5150 101804,5150,3838,3856,5168 101823,5168,3856,3874,5186 101842,5186,3874,3892,5204 101861,5204,3892,3910,5222 101880,5222,3910,3928,5240 101899,5240,3928,3946,5258 101918,5258,3946,3964,5276 101937,5276,3964,3982,5294 101956,5294,3982,4000,5312 101975,4743,3431,3381,4693 101976,5312,4000,3431,4743 102100,5433,4121,3380,4692 102116,5448,4136,4121,5433 102117,4697,3385,4136,5448 102420,4693,3381,4425,5737 102421,5737,4425,4426,5738 102422,5739,4427,3387,4699 102423,5738,4426,4427,5739 *SOLID SECTION, ELSET=INF, MATERIAL=AIR 1.0,0.0,0.0,0.0 **-------------------------------------------- *ELSET,ELSET=INNERAIRABSORB_S3 382, 394, 403, 404, 405, 408, 411, 415, 417, 418, 419, 423, 429, 430, 431, 437, 438, 439, 448, 451, 452, 456, 457, 458, 459, 461, 462, 463, 464, 467, 468, 473, 477, 478, 482, 483, 484, 498, 499, 502, 503, 505, 506, 507 *ELSET,ELSET=INNERAIRABSORB_S2 407, 428, 436, 443, 471, 476, 504 *ELSET,ELSET=INNERAIRABSORB_S1 402, 410, 414, 416, 422, 426, 434, 435, 440, 441, 444, 450, 453, 455, 460, 466, 472, 475, 479, 481, 485, 486, 487, 488, 490, 491, 492, 495, 496, 497, 500 *ELSET,ELSET=INNERAIRABSORB_S4 427, 432, 433, 442, 445, 446, 447, 449, 454, 465, 469, 470, 474, 480, 489, 493, 494, 501 *SURFACE,NAME=INNERAIRABSORB INNERAIRABSORB_S3, S3 INNERAIRABSORB_S2, S2 INNERAIRABSORB_S4, S4 INNERAIRABSORB_S1, S1 ** ------------------------------------------- ** ** MATERIALS ** *MATERIAL,NAME=AIR *ACOUSTICMEDIUM,BULKMODULUS 1.42E5, *DENSITY 1.2, *MATERIAL,NAME=AIRABSORB *ACOUSTICMEDIUM,BULKMODULUS 1.42E5, *ACOUSTICMEDIUM,VOLUMETRICDRAG 1.2, *DENSITY 1.2, *MATERIAL,NAME=STEEL *DENSITY 7920., *ELASTIC 1.9E+11, 0.3 ** ------------------------------------------- *TIE,NAME=ACOST1 INNERAIR2SHELL, SHELL2INNERAIR OUTERAIR2SHELL, SHELL2OUTERAIR ** ** BOUNDARY CONDITIONS AND CONSTRAINTS ** ** The transform and boundary replaces the equation ** used to create ZSYMM condition. ** *TRANSFORM,NSET=SHELLCONSTRAINT 0.0344683,0.6,0.00607769,-0.00607769 ,0.6, 0.0344683 *BOUNDARY SHELLCONSTRAINT,ZSYMM **** *BOUNDARY SHELLSYM,ZSYMM ***EQUATION ** 2 **SHELLCONSTRAINT,1,0.176326981,SHELLCONSTRAINT,3,-1. ** 2 **SHELLCONSTRAINT,2,1.,SHELLSYM,2,-1. **** ------------------------------------------- *AMPLITUDE,NAME=SINE,DEF=PERIODIC 1,,0.0,0.0 0.0,1.0,0,0 ** ** STEP: STEP-1 ** *NSET,NSET=QA_TEST 10,111,118, *STEP *DYNAMIC,EXPLICIT , *BOUNDARY,AMP=SINE INLETPRESSURE,8,8,1.0 *SIMPEDANCE INNERAIROUTLET, ** *OUTPUT,FIELD,NUM=1 *NODE OUTPUT U,POR *NODE OUTPUT,NSET=QA_TEST POR, ***OUTPUT,HISTORY,FRE=1 ***NODE OUTPUT,NSET=CENTERLINE ** POR, ***NODE OUTPUT,NSET=SHELLDISP ** U, **** *END STEP