请教：频谱结果怪异
本帖最后由 comoma2011 于 2011-6-9 18:19 编辑大家好！
我现在有一数据。数据是一列火车通过桥的加速度信号。想求出桥的固有频率。
我通过FFT得到了频谱图。
但是频谱图中没有明显的峰值。
不知是不是噪声隐藏了所要求的频率。
特请教大家帮我看看是什么问题，或是有什么其它方法可以得到明显的峰值，谢谢！
信号在txt文件中，第一列是时间，后面4列式分别是4个传感器在车通过时记录的信号。
没有找到设置附件免费的选项。只好把数据都贴下面了。三部分复制到一个文件中就是完整的信号了。
信号图如下：
44.22 1.958 2.3037 2.9248 0.6582
44.24 0.653 0.1191 2.0664 0.5908
44.26 2.21 3.3018 1.4014 2.8662
44.28 2.698 1.3711 -2.7139 2.5596
44.3 1.247 -1.7773 -1.0254 7.3066
44.32 5.453 -1.1016 1.9463 -1.4658
44.34 5.81 5.4561 2.499 2.4873
44.36 1.846 0.1787 -2.085 -0.4746
44.38 3.467 6.7344 4.2842 1.3027
44.4 1.442 1.96 0.875 1.4727
44.42 3.555 0.8779 0.1064 0.7861
44.44 -1.137 3.6611 1.0186 6.2266
44.46 1.825 2.5898 -2.4463 -0.7139
44.48 4.079 0.8896 -2.6094 1.9482
44.5 -9.109 0.7939 4.917 1.9287
44.52 10.725 2.2422 1.1582 -1.3828
44.54 15.174 0.8906 -14.5713 0.4385
44.56 46.134 -2.7979 -10.3779 -0.3887
44.58 26.275 0.9434 -16.9473 3.667
44.6 14.148 -0.1074 0.4639 3.4482
44.62 39.342 2.0605 -8.2656 -0.4531
44.64 11.642 0.4844 12.9014 1.165
44.66 4.256 2.2998 -4.251 2.7598
44.68 4.423 1.0332 -0.2324 5.3242
44.7 -2.518 2.0957 -2.1367 1.7627
44.72 -0.483 -0.7559 4.7285 7.5879
44.74 -3.516 -3.4189 -1.8906 -4.7412
44.76 -4.271 5.3701 -2.8584 -2.3818
44.78 1.662 -0.5586 0.333 6.292
44.8 2.008 -4.8271 -3.9971 3.25
44.82 3.639 2.002 -7.3525 0.5479
44.84 0.783 1.7969 6.6641 -0.8662
44.86 2.341 -3.8691 2.2832 3.8604
44.88 6.079 2.7695 3.7744 0.0195
44.9 -2.551 5.9492 -2.498 -6.4873
44.92 1.977 -2.5215 10.0752 4.0205
44.94 16.342 -1.0469 -0.0938 -3.208
44.96 -15.149 -2.96 -4.0576 7.0127
44.98 8.642 -6.7979 -2.3926 5.332
45 -17.136 4.543 -4.208 -6.626
45.02 -40.733 2.9521 -8.5391 3.0479
45.04 33.507 -3.8477 8.6348 2.9922
45.06 -11.039 -2.998 3.9463 1.1396
45.08 28.729 7.2617 4.1006 -3.7549
45.1 4.035 6.1416 1.4443 0.0234
45.12 17.939 -4.8574 -9.4561 4.4424
45.14 4.561 0.8633 1.0762 1.2813
45.16 3.924 -0.1416 -7.5029 -4.7949
45.18 2.339 4.9785 12.5439 5.7861
45.2 12.669 4.5605 -5.625 6.0488
45.22 2.848 -3.3203 -12.7266 14.0488
45.24 4.89 -2.1426 3.4697 -4.7754
45.26 -3.464 2.4795 -0.9316 -5.0459
45.28 3.257 4.8086 -4.4443 -0.6201
45.3 2.77 3.0391 2.3428 9.3516
45.32 -0.392 -0.2227 -15.96 -11.3369
45.34 3.671 -1.4385 1.7832 12.8701
45.36 8.199 -1.4717 3.0605 2.499
45.38 1.731 10.5771 -7.1719 -5.7139
45.4 -5.302 -0.0713 6.8389 9.373
45.42 4.699 -4.0381 -2.1221 -2.665
45.44 11.665 6.3506 14.7578 -6.8848
45.46 9.374 0.9854 16.5918 0.3965
45.48 -9.115 -11.541 -18.9395 -0.4678
45.5 0.481 12.6338 18.666 15.3193
45.52 0.476 8.4316 -15.6514 -19.5146
45.54 19.928 0.2617 -16.0146 11.9854
45.56 3.349 -4.8613 -0.582 4.7871
45.58 8.754 -16.0566 -23.543 -9.8457
45.6 10.885 7.3193 29.7773 16.3174
45.62 -6.91 -16.9883 4.7217 -3.0098
45.64 -5.06 9.0029 4.2178 -11.8633
45.66 -5.078 18.6289 9.1484 9.6787
45.68 3.243 0.2627 -2.8311 0.4521
45.7 0.42 10.9629 4.5049 -0.2793
45.72 12.751 -12.4287 -23.1006 0.2852
45.74 -11.155 26.1104 -13.3643 14.0488
45.76 0.627 -1.7246 22.0947 5.5332
45.78 -2.396 -0.8857 -9.8203 -5.8652
45.8 13.044 0.7129 4.3877 -6.9834
45.82 -3.475 -2.8438 -7.6895 12.6445
45.84 3.534 18.2549 -0.292 -19.708
45.86 1.757 11.8555 5.3408 22.9326
45.88 1.43 -24.1084 -8.1426 -8.1074
45.9 6.364 1.2949 1.6914 -7.7109
45.92 20.289 3.0225 14.8506 7.373
45.94 -6.801 -5.375 -35.1328 -9.7803
45.96 -7.479 19.4512 -3.5313 8.5713
45.98 -2.879 21.3076 11.1221 -13.8701
46 8.693 2.4697 -10.0342 -9.3252
46.02 2.593 -8.5596 -4.7344 30.9648
46.04 9.785 -1.8877 -9.9336 -6.3662
46.06 14.821 1.7832 -1.541 -9.334
46.08 0.856 -6.6553 -12.2559 -5.9189
46.1 2.778 -1.4775 -0.626 19.2764
46.12 5.52 16.2813 -11.5996 15.9482
46.14 5.897 -7.2354 -14.9268 4.4316
46.16 -0.521 -9.2451 12.6914 16.6084
46.18 5.752 3.9336 -10.5752 -32.583
46.2 -5.684 -1.6064 -18.6914 25.6436
46.22 4.682 -3.3828 11.9258 12.1104
46.24 1.685 0.6084 -22.1895 -3.6846
46.26 13.009 -12.2324 5.4717 11.7285
46.28 5.69 3.6992 -13.6309 -16.8955
46.3 12.271 3.9863 -11.1377 9.957
46.32 -2.135 2.1123 12.8447 10.292
46.34 4.793 -33.9277 -25.082 -20.7275
46.36 -0.341 20.7246 19.2627 15.0762
46.38 -5.304 -0.4551 5.7354 -7.917
46.4 10.462 -7.5713 -21.4678 12.8633
46.42 -11.211 12.2842 -1.082 -6.9004
46.44 7.788 -3.5029 1.3271 -13.5049
46.46 1.027 28.1729 1.5381 -20.4873
46.48 -0.018 -12.1094 1.6113 37.4707
46.5 -0.104 -1.0488 -10.6768 8.1738
46.52 4.995 -3.3252 6.7471 -2.5996
46.54 -0.146 -2.2705 -15.5928 -12.498
46.56 2.348 6.9951 -0.4941 13.4189
46.58 7.243 -16.6563 -1.4033 7.9561
46.6 -0.706 -0.6992 -5.0732 11.7021
46.62 -4.96 -16.9668 16.9971 -2.752
46.64 10.968 17.3906 17.7734 5.9297
46.66 -0.456 -14.4189 -11.2793 8.4033
46.68 4.269 -17.9668 -1.7021 21.8525
46.7 2.179 14.5 -8.332 -22.1807
46.72 -3.235 -7.751 -17.0195 -7.666
46.74 7.331 13.6318 -8.1914 4.8223
46.76 1.288 -16.0488 12.7676 9.3145
46.78 2.225 1.7939 -13.208 9.8027
46.8 -0.784 -12.0332 -6.123 5.5635
46.82 2.392 13.8145 2.4688 -11.6436
46.84 -2.113 -9.0381 5.457 4.7451
46.86 2.111 10.5957 -1.7822 4.7549
46.88 2.405 -5.3389 -2.8652 -2.3379
46.9 5.913 -3.6787 11.1426 -2.5889
46.92 4.644 21.7109 -14.668 -2.8965
46.94 4.135 -2.8027 5.3945 7.8281
46.96 4.069 4.7598 17.9385 -14.335
46.98 8.812 3.6631 -12.0879 2.6875
47 -6.105 -12.125 7.1299 0.2197
47.02 6.524 15.6006 20.1914 10.5303
47.04 -3.189 -3.668 -5.5098 -8.04
47.06 -0.64 16.8662 -3.2441 16.4707
47.08 3.803 -3.4893 0.3076 -15.0928
47.1 -0.121 11.4004 -3.8398 27.8877
47.12 3.815 -7.3223 -1.3145 0.1377
47.14 2.225 16.6777 1.0439 7.8184
47.16 0.627 -0.9219 -3.9512 -11.5732
47.18 3.307 9.6416 -0.1279 1.1367
47.2 8.656 7.959 11.0605 -0.9375
47.22 4.755 -6.1865 -15.7578 11.7646
47.24 1.557 1.1865 2.2627 -1.5449
47.26 3.81 -0.1611 -16.7715 19.6504
47.28 -0.386 20.2813 -2.1826 -13.374
47.3 6.142 -5.5547 12.8809 13.7627
47.32 4.506 -3.8643 0.9512 3.3154
47.34 1.988 7.2559 -2.708 -5.9121
47.36 4.954 -2.9678 2.0381 15.2852
47.38 -0.425 18.4805 -12.1934 9.4404
47.4 7.627 -5.9854 2.4609 -2.9971
47.42 1.373 9.9375 13.6055 -4.4258
47.44 7.764 7.0059 0.6973 10.4463
47.46 5.367 -4.5156 6.0938 5.8945
47.48 2.599 -2.582 1.5986 -11.3018
47.5 4.534 2.4248 5.7451 -4.7725
47.52 -0.212 -1.7412 -5.9463 6.2607
47.54 9.041 15.9609 -10.5322 -2.6631
47.56 5.793 3.5234 8.3027 30.877
47.58 1.561 -5.1328 -1.6572 -5.3486
47.6 -2.754 5.1709 14.9932 -9.9795
47.62 5.59 -1.0498 -2.3701 5
47.64 4.732 1.6396 -6.4014 0.4463
47.66 6.682 4.8604 9.4336 -6.0605
47.68 0.107 -2.1094 -8.4814 8.4883
47.7 3.636 12.7529 -13.6582 -5.0908
47.72 0.915 3.1006 -1.7266 2.2266
47.74 4.955 2.7832 -1.6494 -0.2148
47.76 8.582 3.5654 3.8662 9.4141
47.78 3.189 3.0596 1.3086 -0.3389
47.8 4.264 4.5596 -7.8115 10.0166
47.82 3.623 0.2012 2.168 -0.6289
47.84 4.745 6.1484 7.5186 -0.292
47.86 0.806 6.3076 -2.6543 -12.5479
47.88 0.795 -1.2754 4.6563 17.2031
47.9 1.201 10.6494 -0.0352 7.7246
47.92 5.798 -9.1182 9.5938 6.9736
47.94 -1.669 7.2373 -0.8203 -0.1738
47.96 4.962 -5.2383 6.334 -6.6738
47.98 -0.556 5.9424 3.2568 2.665
48 7.316 8.584 -1.0137 9.2041
48.02 -3.592 -2.335 -3.3711 5.6367
48.04 -1.328 6.1621 1.5225 5.6475
48.06 5.131 -6.5566 -3.8467 1.3242
48.08 5.535 -5.0234 -3.2705 15.7949
48.1 6.322 12.5674 6.1963 1.7744
48.12 5.5 -12.5693 0.8164 -18.0166
48.14 7.851 9.4658 -17.0117 0.1182
48.16 -0.522 -0.0801 6.5039 2.9678
48.18 2.054 -7.9697 -0.459 0.2676
48.2 -2.122 7.9219 8.7305 6.5811
48.22 6.701 9.1357 14.9189 2.5205
48.24 -4.521 1.7754 -6.7842 -0.8516
48.26 1.322 1.8936 0.9805 -4.8408
48.28 -0.841 2.1943 3.4854 4.3516
48.3 1.616 -0.7842 -8.4912 3.5195
48.32 -1.161 4.21 10.2236 -2.9961
48.34 4.001 2.1533 0.999 2.9053
48.36 9.673 -8.042 8.4883 3.0127
48.38 14.364 3.6191 11.4668 1.416
48.4 -7.853 0.6133 -11.9189 -5.9551
48.42 10.904 9.541 13.8438 -1.165
48.44 -7.823 -0.0195 4.2695 9.7217
48.46 -8.384 2.4375 -7.4492 7.4424
48.48 -0.02 10.9814 5.8916 9.3027
48.5 -5.937 0.0811 -2.1377 -14.1689
48.52 9.183 -1.8291 7.2568 -3.3252
48.54 1.674 1.8896 7.9746 13.46
48.56 11.012 12.8975 -16.3271 -3.3428
48.58 4.644 -3.0566 4.543 9.334
48.6 8.214 3.5107 -3.0996 -10.9922
48.62 0.694 -5.9268 -0.2461 4.2773
48.64 7.704 10.9766 0.835 5.2334
48.66 8.953 -10.6563 -18.5566 -6.541
48.68 4.732 5.3672 -8.8848 5.3457
48.7 4.278 -13.9912 1.3838 -0.751
48.72 11.727 -1.1709 -5.499 -14.0918
48.74 6.078 -5.084 8.7266 4.7588
48.76 0.933 9.0039 -11.4395 -2.5381
48.78 3.171 5.2275 -1.4141 -2.8525
48.8 -0.85 -10.1777 -4.7178 11.1152
48.82 11.959 -3.2881 -3.8379 -3.3281
48.84 11.923 3.3584 7.2432 -15.9463
48.86 -0.565 -2.7402 10.2764 5.7227
48.88 -10.584 8.4092 5.1982 7.417
48.9 -13.403 0.2734 0.2988 -0.793
48.92 0.1 1.4863 0.6631 -7.2471
48.94 -12.351 -5.6602 9.7979 3.9512
48.96 -1.541 5.9902 -7.7725 -5.7842
48.98 -4.937 -3.4541 -17.7471 6.9707
49 -1.044 3.7666 -9.96 18.2842
49.02 8.292 1.1113 1.7568 -9.1064
49.04 3.912 5.0469 -14.4365 -14.5625
49.06 3.492 -3.209 -7.3818 31.04
49.08 9.259 10.7373 -0.7178 -11.4092
49.1 1.479 4.0078 6.2773 -7.5713
49.12 3.281 -2.4941 -13.3389 11.0635
49.14 3.366 -3.7969 -8.3965 -5.4951
49.16 9.673 -5.5986 -12.6025 1.8701
49.18 7.109 -4.6475 -5.084 7.0635
49.2 2.677 11.2725 0.1143 -0.5029
49.22 3.858 -2.5186 7.8018 8.625
49.24 0.446 -0.7773 -24.5557 -8.1611
49.26 1.024 -6.2344 7.8486 -2.4814
49.28 -6.594 -2.8027 2.7148 1.5352
49.3 2.697 -3.4248 -24.709 4.3574
49.32 -2.267 14.1094 17.665 9.3564
49.34 9.088 -5.3633 0.668 6.3799
49.36 -11.336 -3.9873 -35.5566 1.6553
49.38 3.79 3.2891 24.1885 19.2539
49.4 -11.853 24.9521 -31.2471 -12.543
49.42 9.329 -6.0361 -10.5977 19.7275
49.44 -19.483 -14.2012 6.7334 -4.4395
49.46 0.984 -12.2529 -33.252 -11.9727
49.48 12.777 24.0898 9.0352 12.3447
49.5 -6.128 -17.0107 -16.3125 -12.166
49.52 -7.614 6.6152 -10.8125 -4.2422
49.54 -6.417 14.877 20.4414 1.8486
49.56 8.853 6.0957 -23.3301 -7.9736
49.58 -7.273 16.2656 -5.7949 13.6113
49.6 10.548 -7.1299 -19.3682 -14.9873
49.62 -8.216 29.3057 -15.6758 8.2422
49.64 0.776 -9.2559 19.2891 -2.1045
49.66 -7.633 -5.3477 -25.2422 -14.5811
49.68 12.008 4.1572 1.791 4.1445
49.7 -13.421 13.6006 27.2109 25.7168
49.72 1.233 -1.0557 -18.9492 -17.2607
49.74 3.511 11.1787 -8.5068 23.7998
49.76 10.63 -18.8896 -13.1406 -16.0205
49.78 5.183 -2.4785 -4.2305 11.6777
49.8 2.451 3.2344 10.6318 -18.0537
49.82 3.404 -5.7617 10.334 20.0332
49.84 -0.974 -2.5781 -32.1064 6.1191
49.86 2.843 25.0098 -15.1816 -20.8701
49.88 6.483 9.9199 26.5479 -8.0479
49.9 -14.527 -14.8604 -33.7588 13.335
49.92 1.152 15.6514 6.2881 10.7373
49.94 1.196 3.0967 16.6992 2.0254
49.96 4.041 1.3301 -21.9658 -7.8271
49.98 -4.425 -15.1787 27.5918 23.624
50 17.524 8.124 -15.501 7.0332
50.02 -7.519 -7.5615 5.3877 21.9639
50.04 6.121 -22.3057 17.2305 -5.8125
50.06 -9.557 26.8359 18.8311 -18.7568
50.08 5.832 -27.9346 22.5674 18.6709
50.1 0.643 -21.2783 -19.7842 -4.5586
50.12 6.507 14.4775 10.1406 -4.3506
50.14 11.923 -12.3682 -23.6592 16.4209
50.16 -3.631 5.3945 -16.0527 -16.4512
50.18 4.089 7.3867 24.3623 -6.3662
50.2 9.341 -29.2881 -30.6865 32.7363
50.22 11.034 16.0859 -4.7061 -1.3252
50.24 -4.833 10.2061 30.7686 6.7275
50.26 -0.138 -1.5781 -18.6396 -25.959
50.28 1.634 11.3535 7.6484 41.5605
50.3 12.513 -10.3047 -21.5029 -13.4727
50.32 -7.854 -9.7773 -6.6729 -13.6367
50.34 9.557 4.6816 -3.625 7.459
50.36 1.051 -18.542 5.9131 23.1777
50.38 11.622 4.04 19.7344 -39.0059
50.4 6.795 -3.7783 16.9834 10.3965
50.42 2.765 -5.915 -18.3516 -9.3506
50.44 -6.301 13.1484 2.5391 -1.6367
50.46 4.577 -4.6621 2.4922 -5.7617
50.48 -7.08 -8.5508 -32.4502 28.5361
50.5 4.823 2.5938 2.1904 -37.5654
50.52 -1.376 18.5098 33.248 4.042
50.54 2.753 -14.4688 -0.8486 14.8564
50.56 -1.387 21.7402 2.1875 2.749
50.58 7.905 22.4688 -6.4199 -32.2646
50.6 -19.611 -2.4814 -8.3887 28.3027
50.62 -7.927 13.6191 4.6318 7.1289
50.64 -6.682 -2.7021 -13.4248 3.7217
50.66 1.572 12.3701 -12.9424 -17.0605
50.68 12.722 16.8369 2.6963 19.3584
50.7 -13.077 -17.8379 -13.8594 -2.2295
50.72 8.477 9.1133 2.0098 13.2012
50.74 -5.067 14.9043 12.8203 0.6006
50.76 -7.69 6.6631 -5.2021 0.3799
50.78 1.277 -8.0664 -2.1172 20.9824
50.8 -4.963 13.8926 -2.5566 4.8096
50.82 4.943 5.1182 -3.4795 18.0898
50.84 18.748 6.6895 5.0332 -36.6953
50.86 0.556 -6.6895 -23.2949 13.2822
50.88 14.055 16.3486 12.2217 21.1514
50.9 -2.707 7.3936 5.7705 -5.0918
50.92 0.464 8.2061 -14.1553 0.1475
50.94 9.636 22.0137 -4.5654 -13.8896
50.96 0.854 1.4443 -4.1113 -5.9648
50.98 -4.019 6.4629 -8.3447 31.085
51 2.479 -5.5742 -17.5332 -9.623
51.02 -7.138 -12.3467 13.8555 18.3984
51.04 6.758 -3.2061 2.4238 -9.1768
51.06 19.13 3.167 -15.3818 11.6719
51.08 0.645 -17.5303 19.8262 -23.8867
51.1 8.427 -9.9473 -9.9121 15.25
51.12 -4.668 -11.6133 8.2275 -5.1621
51.14 -9.498 -9.3389 27.2695 4.5156
51.16 10.673 -3.3232 10.1035 5.2363
51.18 9.016 -4.0918 -3.5195 15.6309
51.2 5.729 -5.9258 -7.8652 -1.3193
51.22 11.823 -14.7451 8.9551 -5.665
51.24 3.402 -0.9941 -15.7666 -4.1426
51.26 -6.898 1.5156 -7.207 14.46
51.28 4.546 -3.1143 2.5508 -15.0322
51.3 7.414 -2.9922 -1.8711 20.0127
51.32 15.061 3.8057 -12.6982 -11.9316
51.34 13.857 -4.4141 8.7637 -4.998
51.36 14.943 4.3857 8.0527 20.0762
51.38 -1.455 -0.0039 19.7793 -20.7627
51.4 -2.305 3.2861 6.3232 -20.1006
51.42 11.115 2.7979 2.7422 27.0176
51.44 8.073 -0.2178 2.4316 -6.5762
51.46 7.514 -11.2676 13.9629 -0.4287
51.48 -17.661 12.1611 -8.5977 13.0479
51.5 24.651 6.0947 4.0469 -21.2783
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74.1 1.027 4.4082 9.6846 12.2773
74.12 1.931 -1.375 -8.0771 -16.8428
74.14 2.116 -10.25 7.9814 8.7979
74.16 3.257 4.3662 -1.7295 20.8447
74.18 0.556 11.6074 2.5605 -5.8936
74.2 0.972 3.415 9.957 9.3428 请问，你是否见过别人也是这么做的？通过这种方法能够测出桥的固有频率吗？我感觉是一件很有难度的事，可能也很有意思。 我请教了一下专家，是可以这样做的。方法是经验方法，根据桥的类型估计频率大致范围，然后从频谱上找。有点晕！ 仪器要好，时御图里先把峰值较大的时间段的数值给去掉，然后再做FFT分析，重叠率设得大一点 上面的图是频谱图吗，好像不是吧 你分析一下信号的速度和位移，虽然不太准，但是趋势是可以参考的。不知四个传感器位置的速度与位移的变化趋势是否合理？我看了一下好象不太合理，不知是哪些大信号将桥的固有频率信号给淹没了。 1.资料有点多, 实在不需要贴上!
真是的, 怎该直接贴的不贴, 无需贴的却贴了! 楼层高了, 真不易阅读学习!
2.也没人帮忙编辑!? 可能有权者都太忙了
3.噪声隐藏了所要求的频率? 为何? 像吗?
4.是可以由实际环测资料评估结构的固有频率, 但不是说可以全然不知固有频率的大概吧!?
5.这并非平稳信号, 应使用时频分析的方式进行评估, 并试试採取不同的分析参数
6.取样率仅50, 会不会少的点!? 我感觉，桥梁的前几阶固有频率不会太高，多为50Hz以下，有些小于10Hz。
测试数据高频成分较多，可能原因：1、信号有干扰；2、采样频率不合适；3、未设抗混滤波器。等等。 本帖最后由 comoma2011 于 2011-6-14 16:32 编辑
对不起，原本贴了，FFT后的频谱图，但是可能没有编辑成功。
请大家看下面的信号图和频谱图（这个是第3列信号的，使用其它列信号得到的结果类似）。
大概知道第一阶频率在3Hz左右。车引起的频率在1Hz左右。
但是求出的频谱图有太多峰值，而且没有特别突出的峰值。
所以请大家帮忙分析下原因。
回复 7 # huzilong 的帖子
试过，把峰值较大的时间段去掉。还是不能得到较好的结果。{:{28}:}
同时请问怎么设置重叠率在fft分析中？
本帖最后由 comoma2011 于 2011-6-14 19:38 编辑
回复 9 # zdjqh 的帖子
测得的四个加速度信号曲线变化还是挺相似的。但是信号确实不是很好。
不知道能否找到桥的频率。
本帖最后由 comoma2011 于 2011-6-14 19:50 编辑
回复 10 # ChaChing 的帖子
谢谢大家的指导。
关于
问题3：我也不知道。但是一直得不到好的频谱图。
问题4：大概知道一阶固有频率在3Hz左右。但是频谱图上不明显。这也是我困惑的地方。
问题5：我也试过更改不同的参数。我在下面贴上程序（改进使用论坛以前一个朋友的程序），还请进一步指教.
问题6：我认为不少，因为关心的桥的频率在15Hz以下.
程序：
clear;
clc;
clf;
close all;
A = importdata('Experimentaldata.txt');
x=A(:,1);
x=x';
y=A(:,3);
y=y';
% Display the shape of signal(Time Domains)
subplot(2,1,1);
plot(x,y)
xlabel('Time (s)');
ylabel('Acceleration');
title('Signal shape(time domains)');
grid on;
% FFT
y=y-mean(y);
Fs=length(x)/(max(x)-min(x));
N=length(y);
z=fft(y,N);
% Spectral analysis
f=(0:N-1)*Fs/N;
Mag=2*abs(z)/N;
Pyy=Mag.^2;
% Display the spectrum (frequency domains)
subplot(2,1,2)
% plot(f(1:N/2),Pyy(1:N/2),'r')
plot(f(1:N/2),Mag(1:N/2),'r')
%
%If replace Pyy with Mag, we will get the amplitude-frequency figure
% axis()
axis()
xlabel('Frequency (Hz)')
ylabel('Energy')
title('Spectrum (frequency domains)')
grid on;
% Xlim();
% Get the frequency and period at the maximum energy value
=max(Pyy(1:N/2));
fprintf('\n Results obtained by FFT:\n')
fprintf(' FFT_f = %1.3f Hz\n',f(b))
fprintf(' FFT_T = %1.3f s\n',1/f(b))