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频率响应函数（FRF）中的Matlab噪声

[英]Matlab noise in frequency response function (FRF)

原文 2016-04-13 20:31:49 5 1 matlab/ fft/ noise/ frequency-analysis

I am calculating the natural frequencies and the corresponding FRF of a test sample that is excited with a hammer with an accelerometer attached to the tip as input signal and another accelerometer attached to the test sample to measure the response. 我正在计算测试样本的固有频率和相应的FRF，用锤子将其加速度计作为输入信号，并将其连接到测试样本，以测量响应。 The calculation of the natural frequencies works fine, however, when I am plotting the normalized FRF of 40 independent measurements, the noise makes it impossible to discern the natural frequencies as you can see below. 固有频率的计算工作正常，但是，当我绘制40个独立测量值的归一化FRF时，噪声使得无法分辨固有频率，如下所示。

无频响功能

Then I found out about the hanning window and I applied this to my data, which gave me the following FRF: 然后，我发现了汉宁窗口，并将其应用于数据，从而得到了以下FRF：

汉宁频率响应功能

This is an upgrade, but still way too much noise :-( 这是一个升级，但噪音仍然很大：-(

I am hoping someone can help me what to do next to remove as much noise as possible! 我希望有人可以帮助我下一步该怎么做，以消除尽可能多的噪音！ Any help would be appreciated! 任何帮助，将不胜感激！

1 个解决方案

I am not sure this is a StackOverflow question, but I will still try to help you: 我不确定这是一个StackOverflow问题，但我仍然会尝试为您提供帮助：

I would try to use autocorrelation or fft . 我会尝试使用autocorrelation或fft 。 This question could also help you: Determine frequency from signal data in MATLAB 这个问题也可以帮助您：从MATLAB中的信号数据确定频率