I cant get the correct plotting
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I am trying to acheive a specfic graph but the code is not giving me the correct respond needed. The equations are correct but not giving the specfic values needed. I assume its an issue with the loop.
% Given
p = 7500; % kg/m^3
Cd33 = 16*10^10; %N/m^2
vp= 4620; % Ns/m
Ceb = 1.43E-9; % F
phi = 2.62; % As/m
% Piezoelectric Disk Material
dia = 12e-3;
radius = dia/2;
A = pi*radius^2;
tp = 1e-3;
% Water properies for mathcing layer
pw = 1000;
cw = 1500;
vm = 3000;
f0 = vp/4*tp;
tm = vm/4*f0;
% Frequency range
f = linspace(100e3, 2.2e6,200);
alpha = 1;
% Impedence
Rrad = pw*cw*A;
Z0p = 3920; % Ns/m
% frequency range
v0e = zeros(length(f),length(alpha));
% Loop Start
for i = 1:length(alpha)
for j = 1:length(f)
w = 2*pi*f(j);
km = w/vm;
kp = w/vp;
Z0m = alpha*Rrad;
Zcem = phi^2/1j*w*Ceb;
Zm1 = 1j*Z0m*tan(km*tm/2);
Zm2 = Z0m/(1j*sin(km*tm));
Zp1 = 1j*Z0p*tan(kp*tp/2);
Zp2 = Z0p/(1j*sin(kp*tp));
Z = [Zm1+Zm2+Rrad, -Zm2, 0;
-Zm2, Zp1+Zp2+Zm1+Zm2, -Zcem;
0, -Zcem, Zcem];
v0e(j) = phi*[1 0 0]*Z^-1*[0;0;1];
end
v0e(:,i) = v0e(j);
end
figure(1)
semilogy(f, abs(v0e),'linewidth', 2)
xlabel('Frequency [Hz]', 'fontsize', 15)
ylabel('Magnitude [Ns/m]', 'fontsize', 15)
grid on
figure(2)
plot(f, (180/pi)*v0e ,'linewidth', 2)
xlabel('Frequency [Hz]', 'fontsize', 15)
ylabel('phase [deg]', 'fontsize', 15)
grid on
采纳的回答
% Given
p = 7500; % kg/m^3
Cd33 = 16*10^10; %N/m^2
vp= 4620; % Ns/m
Ceb = 1.43E-9; % F
phi = 2.62; % As/m
% Piezoelectric Disk Material
dia = 12e-3;
radius = dia/2;
A = pi*radius^2;
tp = 1e-3;
% Water properies for mathcing layer
pw = 1000;
cw = 1500;
vm = 3000;
f0 = vp/4*tp;
tm = vm/4*f0;
% Frequency range
f = linspace(100e3, 2.2e6,200);
alpha = 1;
% Impedence
Rrad = pw*cw*A;
Z0p = 3920; % Ns/m
% frequency range
v0e = zeros(length(f),length(alpha));
% Loop Start
for i = 1:length(alpha)
for j = 1:length(f)
w = 2*pi*f(j);
km = w/vm;
kp = w/vp;
Z0m = alpha(i)*Rrad;
Zcem = phi^2/1j*w*Ceb;
Zm1 = 1j*Z0m*tan(km*tm/2);
Zm2 = Z0m/(1j*sin(km*tm));
Zp1 = 1j*Z0p*tan(kp*tp/2);
Zp2 = Z0p/(1j*sin(kp*tp));
Z = [Zm1+Zm2+Rrad, -Zm2, 0;
-Zm2, Zp1+Zp2+Zm1+Zm2, -Zcem;
0, -Zcem, Zcem];
v0e(j,i) = phi*[1 0 0]*Z^-1*[0;0;1];
end
end
figure(1)
semilogy(f, abs(v0e),'linewidth', 2)
xlabel('Frequency [Hz]', 'fontsize', 15)
ylabel('Magnitude [Ns/m]', 'fontsize', 15)
grid on
figure(2)
plot(f, (180/pi)*v0e ,'linewidth', 2)
xlabel('Frequency [Hz]', 'fontsize', 15)
ylabel('phase [deg]', 'fontsize', 15)
grid on
2 个评论
Abdullah Alsayegh
2023-3-28
Torsten
2023-3-28
I guess voe is complex-valued. And MATLAB does not like to plot complex values against real values. Thus it only plots the real part of 180/pi*voe against f.
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