新手求助！信号的预处理！

woaiclan · 发表于 2009-4-20 08:08

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我从读出的数据中提出了两列，部分如下：
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第一列为时间，第二列是振动加速度，我用plot，只能作出时程表示，怎么转换频域表示？频域表示后该进行怎么样的预处理呢？直流分量的去除和趋势项的去除，老师建议我直接选用滤波器，请大家告诉我，到底该怎么做啊？惭愧的很，纯属初学，什么都不太懂，学起来好困难的。

woaiclan · 发表于 2009-4-20 11:04

麻烦各位老师给看下吧！谢谢了！

woaiclan · 发表于 2009-5-4 16:23

我现在可以做出傅里叶变换了，但是图的横坐标不是频率，应该是点数，点数乘以时间间隔就是频率吗？再就是，针对这种加速度信号，预处理采用什么方法啊，最小二乘法吗？还请高手帮我解惑

TestGuru · 发表于 2009-5-4 18:33

111.txt (10.32 KB, 下载次数: 12)

假定加速度为g, 做了去除直流(减均值), 积分前低通滤波, 我的结果为:
1. 加速度

[ 本帖最后由 TestGuru 于 2009-5-4 18:39 编辑 ]

TestGuru · 发表于 2009-5-4 18:35

2. 速度

TestGuru · 发表于 2009-5-4 18:37

3. 位移

woaiclan · 发表于 2009-5-4 20:00

谢谢您，不知道能看下您编的程序不能？我太弱了。。

TestGuru · 发表于 2009-5-4 21:03

哦, 我没有编程，是直接下载该软件: www.multi-instrument.com/MIsetup.exe。安装并运行软件后, 点击主菜单中的[文件]>[输入], 然后调入"地板"层的111.txt文本文件即可. 该文件是将你的原始数据中的“空格”置换为“，”，再加入文件头和序号列即可。用EXCEL改很容易。以上结果没有对原始数据进行滤波处理，若你需要，可在时域中设置滤波器即可，有多种滤波器可选。

ChaChing · 发表于 2009-5-4 21:17

养成好习惯, 动手搜一下! 论坛里已经很多了!

胡羽坚 · 发表于 2012-5-28 19:18

我跟楼主遇到同样的问题，楼主解决了吗？能否指导一下

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[滤波] 新手求助！信号的预处理！

马上注册，结交更多好友，享用更多功能，让你轻松玩转社区。

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