113 lines
2.8 KiB
Matlab
113 lines
2.8 KiB
Matlab
%% Clear Workspace and Close figures
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clear; close all; clc;
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%% Intialize Laplace variable
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s = zpk('s');
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addpath('./mat/');
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% Compute Impedance
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R = 10; % Resistive Load used [Ohm]
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V = 0.998; % Output Voltage without any load [V]
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Vp = 0.912; % Output Voltage with resistice load [V]
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R * (V - Vp)/Vp;
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% #+RESULTS:
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% : 0.94298
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R = 47; % Resistive Load used [Ohm]
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V = 4.960; % Output Voltage without any load [V]
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Vp = 4.874; % Output Voltage with resistice load [V]
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R * (V - Vp)/Vp;
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% Effect of Impedance on the phase drop
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C_1 = 5e-6; % Capacitance in [F]
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C_2 = 10e-6; % Capacitance in [F]
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C_3 = 15e-6; % Capacitance in [F]
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Ri = R * (V - Vp)/Vp; % Internal resistance [Ohm]
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G0 = 20;
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G_1 = G0/(1+Ri*C_1*s);
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G_2 = G0/(1+Ri*C_2*s);
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G_3 = G0/(1+Ri*C_3*s);
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piezo1 = load('cedrat_la75b_med_1_stack.mat', 't', 'V_in', 'V_out');
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piezo2 = load('cedrat_la75b_med_2_stack.mat', 't', 'V_in', 'V_out');
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piezo3 = load('cedrat_la75b_med_3_stack.mat', 't', 'V_in', 'V_out');
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Ts = 1e-4;
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win = hann(ceil(0.1/Ts));
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[tf_1, f] = tfestimate(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[co_1, ~] = mscohere(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[tf_2, ~] = tfestimate(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[co_2, ~] = mscohere(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[tf_3, ~] = tfestimate(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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[co_3, ~] = mscohere(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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angle_delay = 180/pi*angle(squeeze(freqresp(exp(-s*Ts), f, 'Hz')));
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freqs = logspace(1, 4, 1000);
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figure;
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ax1 = subplot(2, 1, 1);
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hold on;
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plot(freqs, abs(squeeze(freqresp(G_1, freqs, 'Hz'))));
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plot(freqs, abs(squeeze(freqresp(G_2, freqs, 'Hz'))));
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plot(freqs, abs(squeeze(freqresp(G_3, freqs, 'Hz'))));
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set(gca,'ColorOrderIndex',1);
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plot(f, abs(tf_1), '--')
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plot(f, abs(tf_2), '--')
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plot(f, abs(tf_3), '--')
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hold off;
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
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ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
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ax2 = subplot(2, 1, 2);
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hold on;
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plot(freqs, 180/pi*angle(squeeze(freqresp(G_1, freqs, 'Hz'))));
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plot(freqs, 180/pi*angle(squeeze(freqresp(G_2, freqs, 'Hz'))));
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plot(freqs, 180/pi*angle(squeeze(freqresp(G_3, freqs, 'Hz'))));
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set(gca,'ColorOrderIndex',1);
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plot(f, 180/pi*unwrap(angle(tf_1))-angle_delay, '--')
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plot(f, 180/pi*unwrap(angle(tf_2))-angle_delay, '--')
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plot(f, 180/pi*unwrap(angle(tf_3))-angle_delay, '--')
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hold off;
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
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ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
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ylim([-90, 45]);
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yticks([-90:15:45]);
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linkaxes([ax1,ax2],'x');
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% PI
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R = 10; % Resistive Load used [Ohm]
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V = 1.059; % Output Voltage without any load [V]
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Vp = 0.828; % Output Voltage with resistice load [V]
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R * (V - Vp)/Vp
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% #+RESULTS:
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% : 2.7899
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R = 10; % Resistive Load used [Ohm]
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V = 2.092; % Output Voltage without any load [V]
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Vp = 1.637; % Output Voltage with resistice load [V]
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R * (V - Vp)/Vp
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