Obtain plot for displacement history.

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Juan Gonzalez
Juan Gonzalez 2022-12-28
编辑： Walter Roberson 2025-1-2
Y = fft(diff(strainoption2));
L = size(diff(strainoption2));
L = L(1);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = Fs*(0:(L/2))/L;
figure()
plot(f,P1)

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回答（1 个）

Divyam
Divyam 2025-1-2
Hi @Juan Gonzalez,
The approach for obtaining the plot for displacement history in the question is correct. For the sake of clarity I have added descriptions for the plot and checks for the single sided spectrum P1.
% Assuming strainoption2 is defined and Fs is the sampling frequency
strain_diff = diff(strainoption2);
Y = fft(strain_diff);
% Determine the length of the differentiated strain data since data is 1D
L = length(strain_diff);
P2 = abs(Y/L);
P1 = P2(1:floor(L/2)+1);
P1(2:end-1) = 2*P1(2:end-1);
f = Fs * (0:floor(L/2)) / L;
% Plot the single-sided amplitude spectrum
figure();
plot(f, P1);
title('Single-Sided Amplitude Spectrum of Displacement History');
xlabel('Frequency (Hz)');
ylabel('|P1(f)|');

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