我下载下来了 但是解压不了啊 请高人指点
下载需要的体能太多啊 呵呵
还是下载不下来啊
终于下载下来了啊 太感谢了啊
首先感谢楼主的分享，小弟按照过程做完，但是结果有问题啊，从声压云图看，声波并未传递到腔体和出口管，这是为什么呢，声压只在进口管有体现……求大神帮忙，下面为命令流
New Name '111' Model 1 File 1111.sdb Return
OptionFEM Frequency Fluid Return
Import Mesh Format Nastran File MufflerWithPerforation.bdf Return
Material Fluid
Name 'air'
Sound Real 3.4000e+002Rho Real 1.2250e+000
Elements All
Return
Read Fileset.cmd
Set Name"Inlet"
Faces 6377 6379 6381 6383 6385 To 6386 6388 6390 6392 To 6396 6398 To 6400
Faces6402 To 6403 6405 6407 To 6411 6413 6415 6417 To 6418 6420 To 6421
Faces6423 To 6425 6427 6429 6431
Return
Set Name"Outlet"
Faces 6141 6143 6145 6147 6149 6151 To 6152 6154 6156 To 6161 6163 To 6164 6166
Faces6168 To 6169 6171 To 6174 6176 6178 To 6179 6181 To 6183 6185 6187 6189 6191
Faces6193 6195 To 6196
Return
Environment Section SETUP FEATUREANGLE '60' Return
Set Name" in_out"
Faces 1464 To 1473 1497 To 1506 1530 To 1539 1563 To 1572 1596 To 1605 1629 To 1638
Faces1662 To 1671 1695 To 1704 1728 To 1737 1761 To 1770 1794 To 1803 1827 To 1836
Faces1860 To 1869 1893 To 1902 1926 To 1935 1959 To 1968 1992 To 2001 2025 To 2034
Faces2058 To 2067 2151 2153 2155 2157 2159 2161 2163 2165 2167 2169 To 2179
Faces2203 To 2212 2236 To 2245 2269 To 2278 2302 To 2311 2335 To 2344 2368 To 2377
Faces2401 To 2410 2434 To 2443 2467 To 2476 2500 To 2509 2533 To 2542 2566 To 2575
Faces2599 To 2608 2632 To 2641 2665 To 2674 2698 To 2707 2731 To 2740 2764 To 2773
Faces2798 2800 2802 2804 2806 2808 2810 2812 2814 2816 4344 To 4353 4377 To 4386
Faces4410 To 4419 4443 To 4452 4476 To 4485 4509 To 4518 4542 To 4551 4575 To 4584
Faces4608 To 4617 4641 To 4650 4674 To 4683 4707 To 4716 4740 To 4749 4773 To 4782
Faces4806 To 4815 4839 To 4848 4872 To 4881 4905 To 4914 4938 To 4947 5031 5033
Faces5035 5037 5039 5041 5043 5045 5047 5049 To 5059 5083 To 5092 5116 To 5125
Faces5149 To 5158 5182 To 5191 5215 To 5224 5248 To 5257 5281 To 5290 5314 To 5323
Faces5347 To 5356 5380 To 5389 5413 To 5422 5446 To 5455 5479 To 5488 5512 To 5521
Faces5545 To 5554 5578 To 5587 5611 To 5620 5644 To 5653 5678 5680 5682 5684 5686
Faces5688 5690 5692 5694 5696
Return
Set Name" In_inall"
Faces 1441 To 1450 1474 To 1483 1507 To 1516 1540 To 1549 1573 To 1582 1606 To 1615
Faces1639 To 1648 1672 To 1681 1705 To 1714 1738 To 1747 1771 To 1780 1804 To 1813
Faces1837 To 1846 1870 To 1879 1903 To 1912 1936 To 1945 1969 To 1978 2002 To 2011
Faces2035 To 2044 2069 2071 2076 2078 2081 2083 2086 2088 2093 2095 2193 To 2202
Faces2226 To 2235 2259 To 2268 2292 To 2301 2325 To 2334 2358 To 2367 2391 To 2400
Faces2424 To 2433 2457 To 2466 2490 To 2499 2523 To 2532 2556 To 2565 2589 To 2598
Faces2622 To 2631 2655 To 2664 2688 To 2697 2721 To 2730 2754 To 2763 2787 To 2796
Faces2871 To 2880 4321 To 4330 4354 To 4363 4387 To 4396 4420 To 4429 4453 To 4462
Faces4486 To 4495 4519 To 4528 4552 To 4561 4585 To 4594 4618 To 4627 4651 To 4660
Faces4684 To 4693 4717 To 4726 4750 To 4759 4783 To 4792 4816 To 4825 4849 To 4858
Faces4882 To 4891 4915 To 4924 4949 4951 4956 4958 4961 4963 4966 4968 4973 4975
Faces5073 To 5082 5106 To 5115 5139 To 5148 5172 To 5181 5205 To 5214 5238 To 5247
Faces5271 To 5280 5304 To 5313 5337 To 5346 5370 To 5379 5403 To 5412 5436 To 5445
Faces5469 To 5478 5502 To 5511 5535 To 5544 5568 To 5577 5601 To 5610 5634 To 5643
Faces5667 To 5676 5751 To 5760 6197 To 6376 6378 6380 6382 6384 6387 6389 6391 6397
Faces6401 6404 6406 6412 6414 6416 6419 6422 6426 6428 6430 6432
Return
Set Name"in_inpart"
Faces 1359 1361 To 1362 1364 To 1366 1368 To 1370 1375 1381 2805 2807 2809 2811 2813
Faces2815 2817 2819 To 2820 2822 To 2824 2826 To 2828 2831 To 2834 2837 To 2839
Faces2841 To 2842 5677 5679 5681 5683 5685 5687 5689 5691 5693 5695 5715 5718
Faces5720 To 5721 5723 5725 To 5727 5729 To 5731 5733 To 5736 5738 5740 To 5741
Faces6197 To 6432
Return
Set Name"in_in" Difference4 5Return
Set Name"out_out"
Faces 2 4 6 8 10 12 14 16 18 20 85 To 94 118 To 127 151 To 160 184 To 193 217 To 226
Faces250 To 259 283 To 292 316 To 325 349 To 358 382 To 391 415 To 424 448 To 457
Faces481 To 490 514 To 523 547 To 556 580 To 589 613 To 622 646 To 655 679 To 688
Faces712 To 721 745 To 754 778 To 787 811 To 820 844 To 853 877 To 886 910 To 919
Faces943 To 952 976 To 985 1009 To 1018 1042 To 1051 1075 To 1084 1108 To 1117
Faces1141 To 1150 1174 To 1183 1207 To 1216 1240 To 1249 1273 To 1282 1306 To 1315
Faces1340 1342 1344 1346 1348 1350 1352 1354 1356 1358 2904 To 2913 2937 To 2946
Faces2970 To 2979 3003 To 3012 3036 To 3045 3069 To 3078 3102 To 3111 3135 To 3144
Faces3168 To 3177 3201 To 3210 3234 To 3243 3267 To 3276 3300 To 3309 3333 To 3342
Faces3366 To 3375 3399 To 3408 3432 To 3441 3465 To 3474 3498 To 3507 3573 3575
Faces3577 3579 3581 3583 3585 3587 3589 3591 To 3601 3625 To 3634 3658 To 3667
Faces3691 To 3700 3724 To 3733 3757 To 3766 3790 To 3799 3823 To 3832 3856 To 3865
Faces3889 To 3898 3922 To 3931 3955 To 3964 3988 To 3997 4021 To 4030 4054 To 4063
Faces4087 To 4096 4120 To 4129 4153 To 4162 4186 To 4195 4220 4222 4224 4226 4228
Faces4230 4232 4234 4236 4238
Return
Set Name"out_inall"
Faces 75 To 84 108 To 117 141 To 150 174 To 183 207 To 216 240 To 249 273 To 282
Faces306 To 315 339 To 348 372 To 381 405 To 414 438 To 447 471 To 480 504 To 513
Faces537 To 546 570 To 579 603 To 612 636 To 645 669 To 678 702 To 711 735 To 744
Faces768 To 777 801 To 810 834 To 843 867 To 876 900 To 909 933 To 942 966 To 975
Faces999 To 1008 1032 To 1041 1065 To 1074 1098 To 1107 1131 To 1140 1164 To 1173
Faces1197 To 1206 1230 To 1239 1263 To 1272 1296 To 1305 1329 To 1338 1414 1416
Faces1421 1423 1426 1428 1431 1433 1438 1440 2881 To 2890 2914 To 2923 2947 To 2956
Faces2980 To 2989 3013 To 3022 3046 To 3055 3079 To 3088 3112 To 3121 3145 To 3154
Faces3178 To 3187 3211 To 3220 3244 To 3253 3277 To 3286 3310 To 3319 3343 To 3352
Faces3376 To 3385 3409 To 3418 3442 To 3451 3475 To 3484 3508 To 3517 3615 To 3624
Faces3648 To 3657 3681 To 3690 3714 To 3723 3747 To 3756 3780 To 3789 3813 To 3822
Faces3846 To 3855 3879 To 3888 3912 To 3921 3945 To 3954 3978 To 3987 4011 To 4020
Faces4044 To 4053 4077 To 4086 4110 To 4119 4143 To 4152 4176 To 4185 4209 To 4218
Faces4294 4296 4301 4303 4306 4308 4311 4313 4318 4320 5761 To 6140 6142 6144 6146
Faces6148 6150 6153 6155 6162 6165 6167 6170 6175 6177 6180 6184 6186 6188 6190
Faces6192 6194
Return
Set Name" out_inpart"
Faces 1 3 5 7 9 11 13 15 17 19 28 30 33 35 To 36 38 To 39 41 To 42 44 To 47 49 To 51
Faces53 To 55 57 To 60 62 64 To 65 3534 3538 To 3539 3542 To 3544 3546 To 3552
Faces3554 To 3558 3560 To 3563 3565 To 3567 3569 To 3570 3572 3574 3576 3578 3580
Faces3582 3584 3586 3588 3590 5018 5023 To 5025 5027 To 5028 5761 To 6196
Return
Set Name"out_in" Difference8 9Return
Table 1 Name 'zp' File zp1.tbl Return
Read Filebeta.cmd
Combine
Read Table 1 Return
Invers
Write Table 10 Name 'beta' Return
Constant Real -1 Imag 0
Multiply
Write Table 11 Name 'mbeta' Return
Constant Real 0.98 Imag 0
Multiply
Write Table 12 Name 'mkbeta' Return
Constant Real -1 Imag 0
Multiply
Write Table 13 Name 'kbeta' Return
Return
Relation
Faces Set 6
Transfer Table 10 11 0 12 13 0
Faces Set 3
Return
Relation
Faces Set 10
Transfer Table 10 11 0 12 13 0
Faces Set 7
Return
Boundary VelocityReal -1 Imag 0
Faces Set 1
Return
Boundary ImpedanceReal 416.5 Imag 0
Faces Set 2
Return
slove
Frequecy 20 To 2000 LinStep 20
Return
回复 53 # zhuyun0005 的帖子
请问楼上，你是用的我的模型还是你自己建立的模型？
可以做定性的分析研究用，现在商务车对噪声要求还没有提到一定的高度，这种方法能完全满足使用要求。消声器设计插入损失15到20dBA左右，主要侧重于阻力损失，减小背压。
另消声器噪声辐射也很严重，除消声器材料外，别的还要考虑什么。
回复 54 # bluegangster 的帖子
是用你提供的模型啊，
还有不知道楼主有没有做过这个Sullivan&Corcker-Sysnoise.pdf 例子，这个例子我分析后也是声波只在进口管里面传播，不知道是什么原因，检查步骤发现没错啊{:{13}:}
谢谢学习学习
回复 56 # zhuyun0005 的帖子
肯定是你操作的问题，我做出了的就没有问题
遇到了一个好东西！！！谢谢了
楼主啊，下载不了呢？什么原因啊
原来跟virtual lab一书一样的
谢谢分享