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先建立myfun的文件,再用fsolve(求解5个方程5个未知数a1 a2 a3 a4 a5)
function q=myfun(p)
a1=p(1);
a2=p(2);
a3=p(3);
a4=p(4);
a5=p(5);
X=[2.4,2.4,2.4,2.4;7.2,7.2,7.2,7.2;12,12,12,12;16.8,16.8,16.8,16.8;21.6,21.6,21.6,21.6;26.4,26.4,26.4,26.4;31.2,31.2,31.2,31.2;36,36,36,36;40.8,40.8,40.8,40.8;45.6,45.6,45.6,45.6;50.4,50.4,50.4,50.4;55.2,55.2,55.2,55.2];
Z=[-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20;-20,+20,+20,-20];
Y=[-5,-5,+5,+5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5;-5,-5,5,5];
f=0.52;
da=4.8;
gama=45*pi/180;
numda=2e-6;
cb=1.5016e+005;
fy=5.142e+003;
ma=-1.637e+005;
mb=1.27e+004;
fz=2.084e+004;
mc=-8.684e+003;
for i=1:1:12
for j=1:1:4
Sy(i,j)=a1+a2*X(i,j)+a3*Z(i,j);
Sz(i,j)=a4+a5*X(i,j)-a3*Y(i,j);
Vy(i,j)=(2*f-1)*da*sin(gama)+Sy(i,j);
Vz(i,j)=(2*f-1)*da*cos(gama)b+Sz(i,j);
S(i,j)=sqrt(Vy(i,j)^2+Vz(i,j)^2)-(2*f-1)*da+numda;
P(i,j)=cb*S(i,j)^1.5;
b(i,j)=atan(Vy(i,j)/Vz(i,j));
A1(i,j)=P(i,j)*sin(b(i,j));
A2(i,j)=P(i,j)*sin(b(i,j))*X(i,j);
A3(i,j)=P(i,j)*cos(b(i,j))*X(i,j);
A4(i,j)=P(i,j)*cos(b(i,j));
A5(i,j)=P(i,j)*cos(b(i,j))*Y(i,j)-P(i,j)*sin(b(i,j))*Z(i,j);
end
end
q(1)=sum(A1)-fy;
q(2)=sum(A2)-ma;
q(3)=sum(A3)-mb;
q(4)=sum(A4)-fz;
q(5)=sum(A5)-mc; |