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求助，编写的矩阵微分方程组，然后在运行的时候报错：错误使用 + 矩阵维度必须一致。之后我将式子中求导的项去掉了，然后仍然要求维度必须一致，请问这该如何解决。程序如下：1 o) U$ d5 X, d$ w: \
opt=odeset;opt.RelTol=1e-8;
7 V. E4 C: g% z- F# {Tmh=0;Tmp=0;Mh=4100;Ihx=4032;Ihy=3461;Ihz=4980;Ihxy=31;Ihxz=637;Ihyz=26;Mp=1500;Ipx=117;Ipy=861;
# A+ L2 O+ `8 W; ~8 b" oIpz=754;Ipxy=0.615;Ipxz=152;Ipyz=14.5;* K) o5 D$ l0 ]; g& Z) j4 a
g=9.81;xh=0.237;yh=0.013;zh=0.404;xp=0.5;yp=0;zp=0;xhp=0;yhp=0;zhp=0.96;xch=0;ych=0;zch=0.9;u=12*sin((pi/3)*t);1 m: h9 S( c3 h: [+ e; [3 H! C
v=0;w=12*sin((pi/3)*t);9 U6 G( v" F. {- s5 f
p=12*sin((pi/3)*t);q=12*sin((pi/3)*t);r=12*sin((pi/3)*t);theta=12*sin((pi/3)*t);varphi=12*sin((pi/3)*t);Ch=100;Cp=90;Kp=100;# @ p- K5 H; ~6 I% s' g
A=p*cos(x(1))*cos(x(2))+q*sin(x(1))*cos(x(2))-r*sin(x(2));, B Q4 K a2 B5 J& a" C
B=p*cos(x(1))*sin(x(2))+q*sin(x(1))*sin(x(2))+r*cos(x(2));
( G4 h5 B0 ~" s: xE=-p*sin(x(1))+q*cos(x(1));! W' s. p: {+ Q J- n' V
F=p*cos(x(1))+q*sin(x(1));
0 Y8 Z7 @1 U- \4 ~9 Ze=-diff(p)*sin(x(1))+diff(q)*cos(x(1));* J' o+ H0 F2 o- y
f=diff(p)*cos(x(1))+diff(q)*sin(x(1));/ w8 E! |8 a5 v
Tcwh=Mh.*xh.*(v+xch.*r-zch.*p+xh.*r-zh.*f)+Mh.*yh.*(u-r.*ych+q.*zch-r.*yh+zh.*e)+....
- W+ T6 q' B! j9 k1 p Mh.*zh.*F.*(u-r.*ych+q.*zch-r.*yh+zh.*E)+Mh.*zh.*E.*(v+r.*xch-p.*zch+r.*xh-zh.*F)-Mh.*xh.*F.*(w-q.*xch+p.*ych-E.*xh+yh.*F)...2 U1 Q7 a. q7 a- B c( m0 {5 l
-Mh.*yh.*E.*(w-q.*xch+p.*ych-E.*xh+yh.*F)...4 ?0 Y' C, ]8 }- O* P
+Mp.*((diff(u)-diff(r).*ych+diff(q).*zch-diff(r).*yhp+zhp.*e).*(-yhp-cos(x(2)).*yp)+(diff(v)+xch.*diff(r)-zch.*diff(p)+...9 g& s" `" Z0 y4 Y
xhp.*diff(r)-zhp.*f+b.*xp-a.*zp).*(xhp+xp.*cos(x(2))+sin(x(2)).*zp)+(diff(w)-diff(q).*xch+diff(p).*ych-e.*xhp+yhp.*f-xp.*e+...
& p2 a% b7 w1 D# i9 i. i" D# ]# ~ yp^2.*sin(x(2)).*a)-((u-r.*ych+q.*zch-r.*yhp+zhp.*E-yp.*B+zp.*E).*(-(zhp+zp).*F-yp.*sin(x(2)).*E)+(v+r.*xch-p.*zch+r.*xhp-zhp.*F+...
4 n7 X- S- o6 S6 S xp.*B-zp.*A).*(-zhp.*E+xp.*sin(x(2)).*E-zp.*cos(x(2)).*E)+(w-q.*xch+p.*ych-E.*xhp+yhp.*F-xp.*E+yp.*A)*(xhp*F+yhp*E+xp*F+yp*cos(x(2))*E)))...
0 i' P4 ?+ F3 B1 v9 n+ v( Z% T( s' ` +Ihxz*f+Ihyz*e+Ihz*diff(r)-Ihx*E*F+Ihy*E*F+Ihxy*F^2+Ihxy*E^2-Ihxz*r*E+Ihyz*r*F-Ipx*sin(x(2))*a+Ipz*cos(x(2))*b-...
! o+ b( E: |2 ` Ipxy*sin(x(2))*e-Ipxz*sin(x(2))^2*f+Ipxz*cos(x(2))*a+Ipyz*cos(x(2))*e-Ipx*cos(x(2))*E*A+Ipy*E*F-Ipz*A*E*sin(x(2))-...
% o) f3 G. o, u5 w/ j/ L# } Ipxy*cos(x(2))*E^2+Ipxy*A*F-Ipxz*cos(x(2))*B*E-Ipxz*sin(x(2))*A*E+Ipyz*B*F-Ipyz*sin(x(2))*E^2;) T9 [# q I5 U* p a2 f' E
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发表于 2021-1-20 16:40
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