ode45 error rungg- kutta
Show older comments
help me please, i really want to run this code but i have a trouble: don't have enough argument

% This script accepts the values for the independent variables bs and ga
% and also a flag indicating which model should be used. x(1) is the
% position of the buoy. x(2) is the velocity of the buoy. x(3), x(4) and
% x(5) are the three currents. The outputs are t, x and Pout, which is the
% output power.
% Refer to Section 2 in the final report
function [t,x,Pout] = Simulation(bs,ga,flag)
% run simulation
[t,x] = ode45(@(t,x) LPM_3Phase(t,x,bs,ga,flag), [0 350], [0 0 0 0 0]);
% calculate power
RL = 7.5; %Ohm
v(:,1) = x(:,3)*RL;
v(:,2) = x(:,4)*RL;
v(:,3) = x(:,5)*RL;
Pin = x(:,3).*v(:,1) + x(:,4).*v(:,2) + x(:,5).*v(:,3);
Pout = Pin.*0.85;
end
function dx = LPM_3Phase(t,x,bs,ga,flag)
dx = zeros(5,1);
p = 6;
q = 1;
m = 3;
N = zeros(1,3);
for i = 1:3
N(i) = 82*p*q;
end
L = 0.432; %m
taup = L/p; %m
taut = taup./(m*q); %m
% bs = 0.016; %m
bt = taut - bs; %m
% ga = 0.002; %m
Kc = taut*(5*ga+bs)/(taut*(5*ga+bs)-bs^2);
geq = Kc*ga;
hm = 0.006; %m
Br = 1.2; %T
mu0 = 4*pi*10^(-7);
Hc = 905000;
phi = zeros(1,3);
for i = 1:3
phi(i) = (Br*hm*Hc*mu0)/(hm*Hc*mu0 - geq*Br);
end
if flag == 1 % Simple
um = 2.2; %m/s
uav = 2/pi*um; %m/s
T = 12.6; %s
Ra = 1.5; %Ohm
Ls = 0.115; %H
RL = 7.5; %Ohm
Ms = 4; %number of armatures
Ws = 0.2; %m
KE = Ms*Ws*N(i)*phi(i)*uav;
% u = um*sin(omegam*t);
u = um.*sin(2*pi.*t./T);
du = 2*pi.*um./T*cos(2*pi.*t./T);
e = zeros(1,3);
e(1) = KE*cos(pi.*x(1)./taup)*u;
e(2) = KE*cos(pi.*x(1)./taup - 2*pi/3)*u;
e(3) = KE*cos(pi.*x(1)./taup - 4*pi/3)*u;
v = zeros(1,3);
v(1) = x(3)*RL;
v(2) = x(4)*RL;
v(3) = x(5)*RL;
F = zeros(1,3);
for i = 1:3
F(i) = N(i).*phi(i).*pi./taup.*sin(pi.*x(1)./taup).*x(i + 2);
end
dx(1) = u; % u
dx(2) = du;
elseif flag == 2 % Complex
um = 2.2; %m/s
uav = 2/pi*um; %m/s
T = 12.6; %s
A = 4; %um*T/(2*pi); %m
Ra = 1.5; %Ohm
Ls = 0.115; %H
RL = 7.5; %Ohm
Ms = 4; %number of armatures
Ws = 0.2; %m
KE = Ms*Ws*N(i)*phi(i)*uav;
% u = um*sin(omegam*t);
u = x(2);
e = zeros(1,3);
e(1) = KE*cos(pi.*x(1)./taup).*u;
e(2) = KE*cos(pi.*x(1)./taup - 2*pi/3).*u;
e(3) = KE*cos(pi.*x(1)./taup - 4*pi/3).*u;
v = zeros(1,3);
v(1) = x(3)*RL;
v(2) = x(4)*RL;
v(3) = x(5)*RL;
F = zeros(1,3);
for i = 1:3
F(i) = N(i).*phi(i).*pi./taup.*sin(pi.*x(1)./taup).*x(i + 2);
end
rho = 1025; %kg/m^3
g = 9.81; %m/s^2
a = 0.5; %m
b = 1; %m
h = 10; %m
M = 1000; %kg
mr = 289; %kg
Rr = 16; %Ns/m
Rv = 717; %Ns/m
dx(1) = x(2);
dx(2) = -((Rr + Rv).*(x(2) - 2.*pi.*A./T.*cos(2.*pi.*t./T)) +...
rho.*g.*pi.*a.^2.*(x(1) - A.*sin(2.*pi.*t./T)))./(M + mr);
end
dx(3) = (e(1) - v(1) - x(3)*Ra)/Ls;
dx(4) = (e(2) - v(2) - x(4)*Ra)/Ls;
dx(5) = (e(3) - v(3) - x(5)*Ra)/Ls;
end
Accepted Answer
More Answers (1)
J. Alex Lee
on 1 Jul 2020
0 votes
your error is probably not with the ODE line, but actually running "Simulation", which you are not supplying any arguments to at the command prompt, but it expects 3 arguments: bs, ga, flag
1 Comment
nguyen truyen
on 1 Jul 2020
Categories
Find more on Ordinary Differential Equations in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
