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f(x) pl=1000; phyd=110000; P0=29.39E9; a0=0.0341; v=1.5; x1=x(1); x2=x(2); pg=P0*(a0/x1)^(3*v); y=[x2 (1/pl*(pg-phyd)-3/2*x2^2)/x1]'; Ts = 0.001; % ·ÂÕæ²½³¤ Tn = 1; % ·ÂÕæÖÕֹʱ¼ä t = 0:Ts:Tn; % ·ÂÕæÊ±¼ä·¶Î§ N = length(t); x=[0.034 0]'; % ϵͳ³õÖµ£ºx=[a aµÄµ¼Êý] %% Variable Declaration and Initialization a=0.034*ones(1,N); a_dt=zeros(1,N); %x = [a a_d]'; % intial states %% Simulation Iteration for n = 1:N a(n)=x(1); a_dt(n)=x(2); k1 = fx(x); k2 = fx(x+Ts/2*k1); k3 = fx(x+Ts/2*k2); k4 = fx( x+Ts *k3); x = x + Ts/6 * ( k1 + 2*k2 + 2*k3 + k4 ); end %% Plot Response plot(t,a) xlabel('t/(s)') ylabel('a') ÊÇÒ»¸ö¶þ½×·ÇÏßÐÔ³£Î¢·Ö·½³Ì |
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zhaoqian59
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5Â¥2015-08-11 15:14:44
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zhaoqian59
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3Â¥2015-08-11 15:03:26
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