u should scale the pressure and frequency axis to get what u wanted for i need the pressure data or i can given an of how to convert the pressure and frequency axis. Good luck. if you want any help you can free to contact me
%T18EE009 D J K S S BALAJI
%DETERMINE THE MAGNITUDE OF FUNDAMENTAL SIGNAL OF SINUSODIAL AFTER USING FOURIER TRANSFORM
%INPUT DATA
clc
clear all
f=50;%frequency
FM=50;%FREQUENCY TO OBTAINED
T=0.2;%TIME OF THE SIGNAL
N=1024;%NO OF SAMPLES
S=0.02/N;%SAMPLE TIME
fs=1/S;%SAMPLING FREQUENCY
t=0:S:T-S;%timeinterval
O=30*(pi/180);%phase angle
X=200;%MAGNITUDE
for j=1:N*(T/0.02)
x1(1,j)=0;
end
for k=1:20
A=(X/k)*sin((2*3.141*k*t*f)+(O));%CREATION OF HARMONICS
x1=A+x1;
end
t1=1;
t2=0;
for i1=1:(T/0.02)
for i=t1:t1+N-1
A(1,i-t2)=x1(1,i);
end
y=fft(A);%APPLYING FFT
c=abs(y);%CONVERTING COMPLEX VALUES TO ABSOLUTE VALUES
Q=2*c/N;%CONVERSION OF SAMPLING DOMAIN TO MAGNITUDE DOMAIN
B1=(FM*N/fs)+1;%OBTAINING THE FUNDAMENTAL FREUENCY FROM BINS
op(i1)=Q(1,B1);%OBTAINING FUNDAMENTAL MAGNITUDE FROM FFT
ph(i1)=angle(y(1,B1))*(180/pi)+90;
t1=t1+N;
t2=t2+N;
end
t5=0.02:0.02:0.2;
yyaxis left
plot(t5,op)
yyaxis right
plot(t5,ph,'--')
