Calculate GRMS from a narrow band PSD curve

49 次查看（过去 30 天）
Sud Mudiyanselage
编辑： Sud Mudiyanselage 2024-9-3
H I have PSD values extracted from a narrowband PSD curve, PSD (amplitudes) & Freqeuncy values stored as a array values, generated using plwech function. PSD are G^2/Hz), The whole profile for 20 seconds run would look like below got over 60,000 PSD values. i have a set of data selected from it below.
PSD = [ 0.000250 0.000250 0.000249 0.000248 0.000247 0.000246 0.000245 0.000244 0.000242 0.000241 0.00023];
Freq = [ 0.949 0.999 1.049 1.099 1.149 1.199 1.249 1.299 1.349 1.399 1.449];
How can i calculate GRMS ?

请先登录，再回答此问题。

采纳的回答

Dheeraj
Dheeraj 2024-9-3
Hi Sud Mudiyanselage,
To calculate from the given Power Spectral Density data, please follow the below steps
  1. Calculate Frequency resolution between each frequency bin. Since the bins have non-uniform spacing calculate average frequency resolution.
  2. Use the formula, to calculate . where ​ is the power spectral density at the i-th frequency bin and is the frequency resolution.
Here is an example to do the same:
deltaF = mean(diff(Freq)); %mean frequency resolution
G_RMS = sqrt(sum(PSD * deltaF));
Thank you.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Spectral Measurements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by