75 lines
1.5 KiB
Mathematica
75 lines
1.5 KiB
Mathematica
|
% Load Data
|
||
|
|
|
||
|
|
ht = load('./mat/huddle_test.mat', 't', 'u', 'y');
|
||
|
|
load('./mat/apa95ml_5kg.mat', 't', 'u', 'y');
|
||
|
|
|
||
|
|
% Time Domain Data
|
||
|
|
|
||
|
|
figure;
|
||
|
|
|
||
|
|
subplot(1,2,1);
|
||
|
|
plot(t, u)
|
||
|
|
ylabel('Input Voltage [V]'); xlabel('Time [s]');
|
||
|
|
|
||
|
|
|
||
|
|
subplot(1,2,2);
|
||
|
|
plot(t, y)
|
||
|
|
ylabel('Output Displacement [m]'); xlabel('Time [s]');
|
||
|
|
|
||
|
|
% Comparison of the PSD with Huddle Test
|
||
|
|
|
||
|
|
Ts = t(end)/(length(t)-1);
|
||
|
|
Fs = 1/Ts;
|
||
|
|
|
||
|
|
win = hanning(ceil(1*Fs));
|
||
|
|
|
||
|
|
[pxx, f] = pwelch(y, win, [], [], Fs);
|
||
|
|
[pht, ~] = pwelch(ht.y, win, [], [], Fs);
|
||
|
|
|
||
|
|
figure;
|
||
|
|
hold on;
|
||
|
|
plot(f, sqrt(pxx), 'DisplayName', '5kg');
|
||
|
|
plot(f, sqrt(pht), 'DisplayName', 'Huddle Test');
|
||
|
|
hold off;
|
||
|
|
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
|
||
|
|
xlabel('Frequency [Hz]'); ylabel('ASD [$m/\sqrt{Hz}$]');
|
||
|
|
legend('locaation', 'norteast');
|
||
|
|
|
||
|
|
% Compute TF estimate and Coherence
|
||
|
|
|
||
|
|
win = hann(ceil(1/Ts));
|
||
|
|
|
||
|
|
[tf_est, f] = tfestimate(data(:, 1), -data(:, 2), win, [], [], 1/Ts);
|
||
|
|
[co_est, ~] = mscohere( data(:, 1), -data(:, 2), win, [], [], 1/Ts);
|
||
|
|
|
||
|
|
% Coherence
|
||
|
|
|
||
|
|
figure;
|
||
|
|
|
||
|
|
hold on;
|
||
|
|
plot(f, co_est, 'k-')
|
||
|
|
set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
|
||
|
|
ylabel('Coherence'); xlabel('Frequency [Hz]');
|
||
|
|
hold off;
|
||
|
|
|
||
|
|
% Transfer Function
|
||
|
|
|
||
|
|
figure;
|
||
|
|
ax1 = subplot(2, 1, 1);
|
||
|
|
hold on;
|
||
|
|
plot(f, abs(tf_est), 'k-')
|
||
|
|
set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
|
||
|
|
ylabel('Amplitude'); xlabel('Frequency [Hz]');
|
||
|
|
hold off;
|
||
|
|
|
||
|
|
ax2 = subplot(2, 1, 2);
|
||
|
|
hold on;
|
||
|
|
plot(f, 180/pi*angle(tf_est), 'k-')
|
||
|
|
set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
|
||
|
|
ylabel('Phase'); xlabel('Frequency [Hz]');
|
||
|
|
legend();
|
||
|
|
hold off;
|
||
|
|
|
||
|
|
linkaxes([ax1,ax2], 'x');
|
||
|
|
xlim([10, 5000]);
|