無阻尼二自由系統(tǒng)固有頻率的程序

shouce

% 無阻尼二自由系統(tǒng)固有頻率的程序 20180401A
- Y: {8 B7 o, h. J' v0 ~( k: R' X7 o- Rm1=100;m2=100;k1=200;k2=400;%
c1=0;c2=0;
4 Y$ g% x; I( G) G2 bx0=[1;0];xd0=[0;0];tf=50;dt=0.1;
M=[m1,0;0,m2];k=[k1+k2,-k2;-k2,k2];
c=[c1+c2,-c2;-c2,c2];
A=[zeros(2,2),eye(2);-M\k,-M\c];
5 H& U- I% {- u( c5 Ky0=[x0;xd0];
for i=1:round(tf/dt)+1
    t(i)=dt*(i-1)
    y(:,i)=expm(A*t(i))*y0;
end
subplot(2,1,1),plot(t,y(1,),grid  
subplot(2,1,2),plot(t,y(2,),grid
[p,lamda]=eig(A)




lamda =
( \' ~+ B8 l/ w  Columns 1 through 2
  0.000000000000000 + 3.020447918044219i  0.000000000000000 + 0.000000000000000i
  0.000000000000000 + 0.000000000000000i  0.000000000000000 - 3.020447918044219i
& K8 _' f6 c* q7 p  0.000000000000000 + 0.000000000000000i  0.000000000000000 + 0.000000000000000i
  0.000000000000000 + 0.000000000000000i  0.000000000000000 + 0.000000000000000i
  Columns 3 through 4
7 L- `  G+ _- d) x  0.000000000000000 + 0.000000000000000i  0.000000000000000 + 0.000000000000000i
  0.000000000000000 + 0.000000000000000i  0.000000000000000 + 0.000000000000000i
-0.000000000000000 + 0.936426384924271i  0.000000000000000 + 0.000000000000000i
9 O: h4 Y4 g7 J5 b% _, v% x/ @  0.000000000000000 + 0.000000000000000i -0.000000000000000 - 0.936426384924271i

1 {* h" i& A& w9 z$ D1 _

$ h* u1 T( @% r2 T+ G  C! g! u* B  T

鴻鵠重工

代碼中有個笑臉是啥意思，此處應(yīng)該是什么代碼？