Steady state from data
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Matthew Speijer
on 2 Feb 2021
Commented: Matthew Speijer
on 2 Feb 2021
Wondering if its possible to find the steady state of a data set through a matlab function. Attached is what I'm working with and the plot is of time and theta_dot. Thanks
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Mathieu NOE
on 2 Feb 2021
hello Matthew
see below :
%Import data
load('DCMotor_OL_Data_4.5V_A02.mat')
% smoothin a bit the derivative
theta_dot_smoo = sgolayfilt(theta_dot,1,21);
figure(1);
plot(time,theta_dot,'b',time,theta_dot_smoo,'r');
ylabel('theta dot');
xlabel('Time (s)');
legend('raw','sgolay filtered');
title('theta dot')
% compute steady state values based on smoothed data
threshold = 0.98*theta_dot_smoo(end); % select only values that are above 98% of the last data y amplitude (smoothed)
ind = find(theta_dot_smoo> threshold);
theta_dot_steady_sate = mean(theta_dot(ind));
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