如何MATLAB分析一组振动数据

li343 · 发表于 2007-8-10 08:53

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以前没接触过MATLAB,现在老板要用MATLAB分析一组振动数据,
不知如何下手,请高手指点.
具体:结合流体力学相关知识和信号处理与分析方法，判断实测信号的平稳性、周期性，重点进行随机信号的功率谱估计，通过实测信号的时域统计分析和频谱分析，综合判断流动过程的特征，并依据调节阀阀座同截面东、西、南、北四个位置测点的压力平均值和脉动值分布规律，试解释该截面流场分布特征，同时说明四个动态脉动压力信号波形与阀杆振动波形间的相关性或耦合从属关系。所给五种信号的实测时候的采样率相同，均为：fs＝5kSample/s，数据总长度均为1秒时间采集的实测数据，即N＝5k。
Time       vibration       east       north       south       west
s       um       kPa       kPa       kPa       kPa
8.0002       861.867       11.1423       21.8981       29.3301       24.0321
8.0004       863.7       12.1269       22.9868       31.5069       20.0203
8.0006       866.067       11.875       20.5146       31.8277       21.0578
8.0008       867.667       10.4325       20.4012       31.4611       19.5361
8.001       868.7       12.5619       19.3126       26.2827       19.0058
8.0012       870.9       10.2265       19.8569       30.6362       18.0835
8.0014       872.433       11.5087       19.1312       27.7949       18.7521
8.0016       873.867       9.01295       22.0342       30.4987       18.6599
8.0018       875.667       10.3181       22.2156       29.0552       18.1527
8.002       876.767       9.56247       22.9187       32.4693       17.461
8.0022       878       10.4783       21.9888       29.3989       17.7377
8.0024       877.9       10.6386       21.059       31.6673       17.7838
8.0026       876.867       12.3559       20.7641       28.4594       21.4728
8.0028       876.933       13.2717       23.0775       31.2549       20.2739
8.003       876.1       12.1727       21.5806       30.5904       22.8562
8.0032       875.467       13.203       23.4177       32.538       22.4873
8.0034       875.6       11.9208       21.3538       31.209       20.735
8.0036       875.533       12.4475       23.6672       32.8817       23.9399
8.0038       875.533       14.0731       23.962       30.7737       23.3635
8.004       874.1       13.4091       23.2816       33.9357       25.0927
8.0042       872.6       12.8596       24.6651       32.6297       23.4557
8.0044       871.967       12.333       23.6672       30.9112       26.1994
8.0046       871.567       14.096       28.4073       31.4152       24.1935
8.0048       871.5       13.2488       24.8919       32.6067       23.2251
8.005       870.933       12.6077       24.6651       32.79       20.5967
8.0052       871.2       11.7835       22.5785       27.2908       20.1355
8.0054       871.367       12.3788       23.3043       29.5593       20.0894
8.0056       870.833       11.9208       21.059       28.4823       19.5822
8.0058       870.067       11.8063       21.6033       32.9734       16.7232
8.006       869.667       11.8979       19.0404       28.2074       18.3602
8.0062       869.8       11.211       20.492       29.0781       17.6685
8.0064       869.767       12.7222       19.0404       28.6427       16.4926
8.0066       869.133       9.79144       19.1538       29.9259       16.6309
8.0068       869.3       10.5928       18.4961       29.2385       16.4926
8.007       869.7       9.24192       17.3168       27.1534       15.3167
8.0072       869.867       9.86013       16.3869       29.9946       15.3398
8.0074       870.1       9.95172       16.523       26.7409       15.0631
8.0076       870.267       10.2494       18.5868       32.8359       15.3167
8.0078       871.1       12.6306       20.1518       29.376       19.513
8.008       872.8       9.42509       19.7208       31.209       20.735
8.0082       873.7       14.6226       20.0157       28.826       21.2423
8.0084       873.9       15.3324       21.2858       28.9406       21.3806
8.0086       874.333       12.6993       22.5785       34.119       22.3029
8.0088       874.9       14.9432       22.5785       30.3154       20.9886
8.009       874.5       10.341       22.9414       33.7066       21.7726
8.0092       872.733       13.4091       23.3496       27.1305       21.127
8.0094       871.733       9.56247       23.5991       32.9963       21.1731
8.0096       870.967       11.8292       21.8981       29.2385       18.291
8.0098       870.333       9.42509       20.6054       28.849       18.0143
8.01       869.833       10.547       20.0157       27.9553       15.6626
8.0102       869.8       9.88303       18.8136       31.2549       16.239
8.0104       870.067       8.85268       19.426       32.4693       18.5216
8.0106       871.2       11.2797       21.1043       29.4447       20.0203
8.0108       871.867       9.69985       21.0816       32.4005       19.9972
8.011       873.267       10.1578       21.8301       29.9488       19.8128
8.0112       875.1       9.79144       21.3992       33.5462       20.0894
8.0114       876.667       11.9437       22.7146       31.0257       22.5796
8.0116       877.033       11.2339       24.9372       30.43       25.8536
8.0118       876.733       12.7909       27.1826       32.6067       23.7554
8.012       876.433       13.4549       25.096       32.0339       21.2423
8.0122       876.033       12.5161       24.9372       33.6837       21.1039
8.0124       875.333       12.4932       23.7125       27.7949       21.5881
8.0126       874.167       11.3942       26.0939       33.34       21.3806
8.0128       872.933       12.3788       23.7806       30.7278       19.6744
8.013       872.033       11.5087       25.4135       39.8015       21.5189
8.0132       870.8       13.7068       23.9847       29.5134       21.4959
8.0134       869.833       11.211       24.2568       31.9423       23.2251
8.0136       869.633       13.7068       24.597       30.5904       20.1586
8.0138       869.867       11.9208       22.76       30.4529       20.6197
8.014       870.667       15.0806       23.9393       30.6133       20.1355
8.0142       871.1       12.3559       23.2136       32.4005       23.6863
8.0144       871.833       13.4549       24.1434       30.1321       23.6632
8.0146       872.9       14.4853       24.9372       30.6591       24.7469
8.0148       873.7       12.539       27.1145       35.1501       24.1935
8.015       874       15.2179       24.7104       32.8817       22.7179
8.0152       874.7       12.0353       27.3867       31.4152       24.9313
8.0154       875.067       14.8287       27.2052       30.155       23.4096
8.0156       874.933       13.2946       27.3186       34.921       22.0262
8.0158       875.1       13.0657       24.1888       30.6362       20.6197
8.016       875.333       12.7451       23.1002       31.3923       19.5361
8.0162       875.1       11.8063       22.261       29.3989       19.3516
8.0164       874.733       14.1189       23.3496       29.5822       19.098
8.0166       874.433       10.8447       21.9208       33.7295       17.4149
8.0168       874.767       12.5161       21.9662       29.8571       20.5506
8.017       873.867       10.6615       22.1249       30.5675       23.156
8.0172       874       11.5774       24.2115       33.7982       23.7785
8.0174       874.633       13.2488       23.0321       29.5364       22.372
8.0176       875.1       12.4475       24.3249       34.4856       22.4643
8.0178       875.833       14.2792       21.9888       30.2008       21.4037
8.018       875.6       11.1881       22.828       31.4152       26.1072
8.0182       875.467       14.8745       23.0321       29.5364       23.0637
8.0184       875.7       11.6003       24.461       31.7819       24.2396
8.0186       875.7       14.6913       23.3043       33.9357       22.0723
8.0188       875.067       12.4704       24.4836       28.849       21.9109
8.019       874.567       12.3788       24.03       31.3923       21.4037
8.0192       874.767       13.1115       24.2342       27.9782       19.1902
8.0194       875.033       13.6152       21.9662       32.6526       19.3747
8.0196       874.433       13.7297       22.8053       32.9275       19.7436
8.0198       873.467       12.4932       20.8548       28.3678       20.735
8.02       872.3       12.6306       22.1249       30.6362       19.9972
8.0202       871.6       13.6152       21.5806       31.5986       18.9827
8.0204       871       12.4475       21.4672       35.7       19.8358
8.0206       870.833       13.4549       22.7373       29.6051       25.4386
8.0208       870.667       11.8063       25.8444       31.9881       25.0236
8.021       869.467       13.8899       26.7063       31.5756       27.0987
8.0212       868.7       16.6604       28.0671       35.2876       26.3147
8.0214       868.233       18.1029       26.9784       33.6837       25.9919
8.0216       868.167       15.9506       27.7722       33.3629       25.4616
8.0218       867.867       15.7904       25.2548       30.7737       23.3174
8.022       867.533       14.7142       25.595       34.646       22.8101
8.0222       867.1       13.0428       23.3043       31.5069       20.7811
8.0224       866.667       12.8596       22.3744       30.682       21.934
8.0226       866.5       12.104       23.4177       30.7508       20.8503
8.0228       866.4       13.0657       23.0548       32.4463       20.1817
8.023       866.8       12.333       23.7806       36.3874       20.8042
8.0232       867.1       13.5236       23.3723       28.9864       23.2251
8.0234       866.7       12.333       26.729       34.1419       25.7153
8.0236       866.1       14.76       26.6609       30.9799       25.1158
8.0238       865.567       15.3095       26.865       35.1959       24.6547
8.024       866.3       15.2637       26.0712       30.3841       24.7238
8.0242       867.467       14.8058       29.5413       34.119       26.5684
8.0244       868.233       16.546       29.065       31.2778       27.3292
8.0246       868       19.0646       31.1516       35.0814       26.8681
8.0248       867.667       19.7973       28.0217       36.3645       25.3925
8.025       867.367       18.7669       30.9021       35.1272       29.4274
8.0252       867.033       17.0268       31.0608       31.5986       26.845
8.0254       866.633       18.744       31.4464       33.4545       24.4702
8.0256       866.067       19.6141       28.9289       31.484       22.372
8.0258       865.967       19.408       28.3392       34.4627       22.349
8.026       865.467       17.9655       26.9558       33.7295       22.349
8.0262       864.667       16.3857       24.6197       30.4071       21.6803
8.0264       864.667       14.8974       25.2094       34.0732       20.7811
8.0266       865.3       15.5385       23.5311       31.3694       21.0578
8.0268       866.167       14.6684       26.0486       31.2549       25.1158
8.027       866.433       15.4927       27.4547       32.79       25.1158
8.0272       865.933       16.5231       27.1599       33.1337       25.4847
8.0274       866.567       15.0119       25.731       31.5069       21.5881
8.0276       868.133       16.317       25.1867       33.0192       23.2713
8.0278       868.467       15.1951       28.5434       33.9357       25.208
8.028       868.667       15.9049       28.5434       30.0863       25.2772
8.0282       869.333       15.0577       27.7949       34.7148       21.7956
8.0284       869.733       14.1647       24.2115       29.3301       21.4267
8.0286       870.267       13.2259       24.3022       30.6591       21.0578
8.0288       869.9       12.8825       24.4383       29.2843       20.8042
8.029       869.6       13.203       23.6672       29.0093       17.9221
8.0292       871.7       10.776       22.1476       28.7115       18.268
8.0294       873.533       11.6232       22.8734       28.3449       17.6454
8.0296       874.667       10.776       22.9187       29.9946       18.9827
8.0298       874.533       11.875       22.0569       28.0699       19.3055
8.03       874.067       12.539       22.5785       29.9946       18.9827
8.0302       873.867       11.9895       20.6054       30.5904       17.3457
8.0304       874.233       12.9741       24.3249       29.4447       20.8272
8.0306       874.567       14.7371       21.9888       31.0028       18.4063
8.0308       875.033       11.7606       21.7847       31.3236       18.3141
8.031       875.4       13.9357       19.9023       30.1092       17.7607
8.0312       874.9       11.0508       22.3064       29.8571       21.9801
8.0314       874.567       13.8441       23.5764       29.8571       23.1329
8.0316       874       12.9054       25.164       32.0568       23.3174
8.0318       873.733       14.6455       24.9599       30.3154       22.2106
8.032       873.8       13.2259       24.3929       32.5151       22.4643
8.0322       873.633       12.8367       25.0733       26.9701       21.6803
8.0324       873.433       12.6535       23.6898       31.0257       20.1355
8.0326       872.933       12.2643       21.9208       29.4447       18.5446
8.0328       873.133       11.6003       21.4672       28.6198       20.1355
8.033       873.967       11.4171       23.5311       30.5445       23.9399
8.0332       875.467       12.0811       22.6012       28.1386       21.5881
8.0334       876.133       11.1881       23.2136       29.2156       21.5651
8.0336       876.033       13.6381       24.5744       27.6116       21.4728
8.0338       877.033       12.9741       25.8218       32.5838       23.156
8.034       878.733       14.0731       24.7785       30.957       21.1039
8.0342       880.567       13.2717       24.3249       33.5004       21.6342
8.0344       882.6       13.5923       24.3249       33.1796       22.8101
8.0346       884.6       13.4778       24.8919       31.0486       24.1474
8.0348       885       13.0199       26.23       30.682       22.764
8.035       884.733       14.2334       25.6176       32.538       20.8964
8.0352       885.033       16.317       25.4362       29.5364       21.4498
8.0354       885.633       14.2563       26.5022       30.4529       22.349
8.0356       885.967       14.7371       28.0444       28.0928       23.3635
8.0358       885.733       14.1418       25.6403       29.1239       19.9511
8.036       884.9       14.5768       25.3001       30.682       20.3661
8.0362       884.5       13.5694       23.0775       27.4971       19.2594
8.0364       884.833       12.104       23.9166       28.9864       22.2568
8.0366       885.2       12.3559       22.4878       29.376       19.2824
8.0368       885.633       12.7222       23.5538       32.9504       21.6342
8.037       887.167       16.7291       25.1187       33.065       22.0954
8.0372       888.7       16.2025       24.8238       33.9357       25.9919
8.0374       889.6       16.088       25.2094       30.2925       24.6777
8.0376       890.3       14.6226       23.9847       29.4905       24.2627
8.0378       891.867       15.2866       23.962       31.0028       23.5249
8.038       893.4       15.1035       22.1476       30.4529       24.5394
8.0382       894.467       14.8745       24.3476       30.6362       24.2857
8.0384       893.967       14.1189       23.5764       30.2467       22.6948
8.0386       893.8       14.5997       24.9826       30.7508       21.127
8.0388       893.767       15.7904       21.6713       34.8981       19.4438
8.039       893.133       14.2105       22.2837       30.9112       21.8648
8.0392       893       15.2179       22.3064       29.9946       21.3345
8.0394       893.933       13.5923       24.0754       30.9799       22.1415
8.0396       895.4       13.6381       21.3992       32.4463       21.4959
8.0398       896.8       13.5694       22.4878       29.9259       23.0868
8.04       898.3       13.0886       22.0796       29.4676       24.5163
8.0402       898.7       13.8213       26.729       30.8195       22.8562
8.0404       898.533       14.4624       23.5084       30.4529       20.5045
8.0406       897.333       16.2025       23.5991       30.957       20.3892
8.0408       896.167       13.1801       21.3538       31.0945       21.7265
8.041       895.633       15.6301       21.0136       29.5593       19.905
8.0412       896.7       11.5087       20.9682       28.7115       20.1586
8.0414       897.6       13.3633       21.3538       28.1157       18.0143
8.0416       898.367       12.6535       23.2816       28.7115       19.6975
8.0418       898.433       14.1418       23.9847       30.3154       22.8101
8.042       897.2       14.3479       23.4177       33.1796       22.764
8.0422       895.7       14.3708       22.0115       33.4316       23.1329
8.0424       894.8       14.096       24.7558       32.3776       25.8767
8.0426       893.6       13.7755       25.2094       31.6444       24.8852
8.0428       894.067       14.3479       26.7516       34.3252       23.2251
8.043       894.333       16.088       25.096       29.2385       22.0031
8.0432       893.867       15.7217       24.4383       31.2778       24.8852
8.0434       893.467       15.0348       25.8444       29.1239       24.9774
8.0436       893.533       15.5614       25.9125       29.4447       25.1388
8.0438       892.833       13.3862       25.0506       30.682       21.542
8.044       891.533       14.6226       24.6878       26.2597       24.1935
8.0442       891.133       13.4778       28.3619       30.5904       24.5624
8.0444       891.367       15.0348       26.5248       31.7131       25.6461
8.0446       892       17.21       29.3145       32.8817       23.6171
8.0448       891.667       18.0113       27.1372       34.8522       24.1013
8.045       891.533       16.3857       29.9495       32.7671       27.5598
8.0452       891.833       17.1413       30.766       31.2319       27.5828
8.0454       891.633       16.6604       31.265       36.0896       26.5222
8.0456       889.933       19.3622       29.6547       29.7655       24.5855
8.0458       889       16.3857       28.4753       33.5004       24.793
8.046       888.767       15.4469       27.432       28.9406       22.8562
8.0462       888.633       15.7904       25.164       29.353       21.1962
8.0464       887.533       12.3559       23.8486       32.8359       20.1355
8.0466       886.6       13.6381       22.3971       28.1386       20.9425
8.0468       886.367       10.776       23.1228       29.4447       22.5796
....          ....          ...          ...          ...          ...
在此,先谢过诸位高手!

[ 本帖最后由 eight 于 2007-8-10 14:26 编辑 ]

eight · 发表于 2007-8-10 14:26

原帖由 li343 于 2007-8-10 08:53 发表

 登录/注册后可看大图

以前没接触过MATLAB,现在老板要用MATLAB分析一组振动数据,
不知如何下手,请高手指点.
具体:结合流体力学相关知识和信号处理与分析方法，判断实测信号的平稳性、周期性，重点进行随机信号的功率谱估计，通过实 ...

建议楼主看看各个置顶贴，然后就知道下一步如何做了

lalagay · 发表于 2007-8-11 17:33

在这组实验数据中，感兴趣的是低频有用信号
要先画出时域波形图，从时域波形上基本能看到低频信号周期，可先看波形，读时间轴的值，有个大致时间段，在什么其倒数即为频率，按照这个周期先截取两个周期数据进行功率谱或者均方根谱分析，去掉0位值，再展示频谱图，初看能量最大相对准确位置。。

问题是，时域波形很杂乱如何基本看出低频信号周期？是不是看看大概包络的图的周期就可以了？
去掉0位值是什么意思？频谱图在0位有最大值，是不考虑这个值，还是对原信号先进行去处趋势项的处理？

对于matab实现信号分析的原理已经知道，但是这个处理要采用根据有用信号周期对数据分组，不是均匀分组。然后再对每组数据进行一半重叠的平均周期法~~
这个具体的数据分组的方法不知道如何处理，望达人指点。

prince00840 · 发表于 2008-12-6 15:33

这个问题根据什么来呢

mayan20051341 · 发表于 2012-11-2 12:58

这是很简单的matlab基础应用，建议查看matlab帮助文件关于fft的描述

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[综合讨论] 如何MATLAB分析一组振动数据

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