Rolling RMS in Simulink model

I have a 60 second waveform I have imported into Simulink. I would like rolling average of the RMS in a 5 second window. Using the RMS block I can find the RMS over the complete signal or find the RMS value with a reset every 5 seconds but not a rolling 5 second window. Any advice on how I could achieve this.

Thanks

Answer 1

[Star Strider]

I’m not sure how to do it in Simulink, so you’ll have to adapt this:

t = 0:0.001:60;                                     % Time Vector (Ts = 0.001)
y = sin(2*pi*t/10);                                 % Signal

wndw = 1000;                                        % Averaging Window Length (samples)
rms = sqrt(filter(ones(1,wndw), wndw, y.^2));       % Calculate RMS For Each Sample Window

figure(1)
plot(t, y,    t, rms)
grid

With a window length of 1E+4, this eventually gives a straight line with a value of 0.707..., the correct RMS value for a sine function. Experiment with the window length to get the result you want with your signal.