从 FFT 获取 FRF
我有传感器输出数据的 FFT。有没有办法从中得到频率响应函数FRF。我没有任何输入数据。请帮忙。
I have the FFT of a sensor output data. Is there any way to get frequncy response function FRF from this. I dont have any input data. Plz help.
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如果您对输入数据没有任何了解,那么您就无法真正计算频率响应。然而,如果您碰巧知道输入信号是白噪声,那么您至少可以获得频率响应幅度的近似值。
If you don't have any knowledge of the input data then you can't really calculate the frequency response. However if you happen to know that input signal is e.g. white noise, then you can at least get an approximation of the magnitude of the frequency response.
对 FFT 输出数据进行 IFFT(基本上是 FFT)将使您回到时域。对于上述答案感到抱歉,它没有解决问题。更有用的是,IIRC,FRF 是响应(输出)的 FFT 与响应的 FFT 之比
激励(输入)。由于您只有输出的 FFT,因此我认为无法仅从中获得 FRF。
Taking the IFFT (basically the FFT) of the FFT output data will give get you back into the time domain.Sorry for the above answer, which doesn't address the question. To be more helpful, IIRC, the FRF is the ratio of the FFT of the response (output) to the FFT of the
excitation (input). Since you only have the FFT of the output, I'd say that there is no way to obtain the FRF from this alone.