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[综合] 请教:PSD曲线变化剧烈说明什么?

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发表于 2007-9-20 15:25 | 显示全部楼层 |阅读模式

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自功率谱密度曲线变化的剧烈与平缓能表明什么?请各位赐教!多谢!

[ 本帖最后由 shadowying7 于 2007-9-20 19:18 编辑 ]
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发表于 2007-9-20 21:12 | 显示全部楼层
PSD表示的是振动信号的频率分量。
发表于 2007-10-10 21:22 | 显示全部楼层
我也想问类似问题
如何分析
曲线说明什么呢
发表于 2007-10-16 19:04 | 显示全部楼层

回复 #1 shadowying7 的帖子

找到答案了没?如果PSD表示的是振动信号的频率分布的话,说明振动频率变化太大,但是我没有找到哪本书上说过!
发表于 2007-10-16 19:33 | 显示全部楼层
如果功率谱曲线有突出的峰值,也就是峰值两边的曲线变化剧烈,说明是一个窄带随机过程,或者是一个周期振动。

如果功率谱曲线较为平坦,没有变化非常缓慢,这就表明是一个宽带振动。振动具有丰富的频率分量。
发表于 2007-10-16 19:38 | 显示全部楼层

回复 #5 wanyeqing2003 的帖子

你好!我现在有一个问题,就是我用不同的方法,求出同一信号的功率谱,不一样,有的方法求出的功率谱曲线有突出的峰值,有的方法求出的功率谱曲线较为平坦,请问为什么?
发表于 2007-10-16 21:54 | 显示全部楼层
本帖最后由 wdhd 于 2016-9-19 11:17 编辑
原帖由 jingrenzhi 于 2007-10-16 19:38 发表
你好!我现在有一个问题,就是我用不同的方法,求出同一信号的功率谱,不一样,有的方法求出的功率谱曲线有突出的峰值,有的方法求出的功率谱曲线较为平坦,请问为什么?

需要把具体处理的方法和数据提供给我们,这样才能帮你解决问题。

其中的可能,采样频率选取的问题,A/D变换的问题,软件本身的问题等。
发表于 2007-10-18 20:35 | 显示全部楼层

回复 #7 wanyeqing2003 的帖子

这是我的程序和数据,请帮忙看看!谢谢!
(1)clear
clc
close all hidden
fni=input('wenjian:','s');
Fs=512;
N=1024;
n=0:1/Fs:1;
fid=fopen (fni,'r');
sf=fscanf (fid,'%f',1);
m=fscanf (fid,'%d', 1);
fno=fscanf (fid,'%s',1);
x=fscanf(fid,'%f',inf);
status=fclose (fid);
pyulear(x,15,N,Fs)
(2)clear
clc
close all hidden
fni=input('wenjian:','s');
fid=fopen (fni,'r');
x=fscanf(fid,'%f',inf);
N=1024;
fs=512;
h=spectrum.welch;
Hpsd=psd(h,x,'fs',fs);
plot(Hpsd)
数据附件,不会发,见下一贴!呵呵
发表于 2007-10-18 20:37 | 显示全部楼层

回复 #7 wanyeqing2003 的帖子

我把数据做成了文本格式,这样更方便。
                                              ------zhangnan3509

[ 本帖最后由 zhangnan3509 于 2007-10-18 20:40 编辑 ]

1.txt

14.46 KB, 下载次数: 19

发表于 2007-10-19 09:36 | 显示全部楼层

回复 #9 jingrenzhi 的帖子

你真的是太好了!能教给我怎么做的吗?以后我可以少占点版面空间!呵呵!
发表于 2007-10-22 13:08 | 显示全部楼层

回复 #7 wanyeqing2003 的帖子

请问这两个程序,所用的方法有啥区别?谢谢
发表于 2007-10-22 14:09 | 显示全部楼层
怎么打不开数据?
发表于 2007-10-22 15:29 | 显示全部楼层

回复 #12 wanyeqing2003 的帖子

哦!我也不知道!你这样看看!就是占版面太多!:@)
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1.799133e-02
1.281058e-02
6.782073e-03
1.007891e-02
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1.978105e-03
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2.449082e-03
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1.695518e-03
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1.102087e-02
1.469449e-02
1.337575e-02
1.205702e-02
3.202646e-03
-1.318736e-03
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8.477591e-04
1.017311e-02
1.497708e-02
1.196282e-02
1.525966e-02
1.243380e-02
1.120926e-02
1.516547e-02
1.431771e-02
5.651727e-03
-3.767818e-04
发表于 2007-10-22 16:25 | 显示全部楼层
看了一下数据,只有中间一段数据是有效的。

数据分析时,应该考虑合理地选择数据区间和采样频率。应该说这样的信号应该有比较明显的峰值。
1.JPG

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发表于 2007-10-22 16:37 | 显示全部楼层

回复 #14 wanyeqing2003 的帖子

请问,针对我那两个程序,处理的结果,怎么不一样?
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