not geting the plot and my loop is not working
显示 更早的评论
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');
采纳的回答
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
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');
3 个评论
Sourav singh
2021-3-12
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.
Sourav singh
2021-3-13
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