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not geting the plot and my loop is not working

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Sourav singh
Sourav singh 2021-3-12
评论： Sourav singh 2021-3-13
sigma=0.047193;
V_tip=180;
W=180;
Cd_avg=0.01;
R=2.235;
Rv=80.529; %rotational velocity
A=pi*R.^2;
rho=1.225;
for Ct=0.004:0.0001:0.005
Vs=-(sqrt(Ct./2)+((sigma*Cd_avg)./(8*Ct))).*(Rv*R); %descent speed
Cd_eq=((2*W)./(rho.*A.*(Vs).^2)); % equivalent drag coefficient of the rotor in steady descent
end
hold on
plot(Ct,Cd_eq,'r');

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采纳的回答

Mathieu NOE
Mathieu NOE 2021-3-12
hello
consider indexing your variables
sigma=0.047193;
V_tip=180;
W=180;
Cd_avg=0.01;
R=2.235;
Rv=80.529; %rotational velocity
A=pi*R.^2;
rho=1.225;
Ct=0.004:0.0001:0.005;
Cd_eq = zeros(1,length(Ct));
for ci = 1:length(Ct)
Cti = Ct(ci);
Vs=-(sqrt(Cti./2)+((sigma*Cd_avg)./(8*Cti))).*(Rv*R); %descent speed
Cd_eq(1,ci)=((2*W)./(rho.*A.*(Vs).^2)); % equivalent drag coefficient of the rotor in steady descent
end
plot(Ct,Cd_eq,'r');

更多回答（1 个）

Alan Stevens
Alan Stevens 2021-3-12
Needs to be as follows:
sigma=0.047193;
V_tip=180;
W=180;
Cd_avg=0.01;
R=2.235;
Rv=80.529; %rotational velocity
A=pi*R.^2;
rho=1.225;
Ct = 0.004:0.0001:0.005;
for i = 1:numel(Ct)
Vs=-(sqrt(Ct(i)./2)+((sigma*Cd_avg)./(8*Ct(i)))).*(Rv*R); %descent speed
Cd_eq(i)=((2*W)./(rho.*A.*(Vs).^2)); % equivalent drag coefficient of the rotor in steady descent
end
hold on
plot(Ct,Cd_eq,'r');
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Alan Stevens
Alan Stevens 2021-3-12
i is a commonly used index counter, but it is arbitrary and you can use whatever you like.
You can also have Vs(i) if you wish, then all values of Vs are available at the end of the loop. However, your original code only had Cd_eq being plotted, so that was the only one I put the i into.

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