Pcomp.m
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上传用户:eighthdate
上传日期:2014-05-24
资源大小:270k
文件大小:3k
源码类别:
其他行业
开发平台:
Matlab
- function [numopen, denopen, denclsd] = pcomp(num, den, zeta)
- % Hadi Saadat, 1998
- discr=[
- ' '
- ' The function pcomp(num, den, zeta) is used for the design of gain '
- ' factor compensation. num and den are row vectors of polynomial '
- ' coefficients of the uncompensated open-loop plant transfer function. '
- ' zeta is the desired damping factor. K0 for the required damping ratio '
- ' is found. The function returns the open-loop and the closed-loop '
- ' numerator and denominator of the compensated system transfer function. '
- ' '];
- %disp(discr);
- c1=0:.1:10; c2=11:1:100; c3=110:10:1000;
- k=[c1 c2 c3]; kk=k';
- j=0;
- r=rlocus(num,den,k);
- ri=imag(r); risum=sum(ri);
- costhta=cos([pi-angle(r)]);
- j= find (risum > .5);
- if isempty(j)==1;
- disp('Warning: zeta line does not cross root-locus')
- return,else, end
- l=length(costhta);
- for i=1:l for c=1:j
- if costhta(i,c) ==-1 costhta(i,c)=1; end,end,end
- cost=(costhta(:,j));
- l=length(cost);
- if cost(1) > zeta
- i = find(cost < zeta);
- else
- i = find(cost > zeta);
- end
- if length(i) == 0
- disp('Warning: zeta line does not cross root-locus'),return
- else
- while i(1)>l i(1)=i(1)-l; end
- i2 = i(1);
- i1 = i2 - 1;
- k1 = min(kk(i1,:));
- k2 = min(kk(i2,:)) ;
- m1 = min(cost(i1,:));
- m2 = min(cost(i2,:));
- K0 = k1 + (m1-zeta)*(k2-k1)/(m1-m2);
- end
- K0=round(100*K0)/100;
- clc
- fprintf('Controller gain: K0 = %g',K0),
- fprintf('nn')
- % the following statements will form the characteristic Equation
- % of the compensated system.
- m=length(num); n=length(den);
- if n > m
- o=zeros(1,n-m); mk=[o,1]; num1=conv(num,mk);
- else, num1=num, end
- numgc=K0; numopen=conv(numgc,num1);
- denopen= den;
- denclsd=denopen+numopen;
- numopen=numopen(n-m+1:length(numopen));
- %fprintf('Row vectors of polynomial coefficients of the compensated system:nn')
- %fprintf('Open-loop num. '),disp(numopen)
- %fprintf('Open-loop den. '),disp(denopen)
- %fprintf('Closed-loop den'),disp(denclsd)
- fprintf('Compensated open-loop ')
- GH = tf(numopen, denopen)
- fprintf('Compensated closed-loop ')
- T = tf(numopen, denclsd)
- discr2=[
- 'Roots of the compensated characteristic equation: '
- ' '];
- disp(discr2)
- R=roots(denclsd);
- disp(R)
- rreal=real(R);
- for l=1:n-1
- if rreal(l) >=0
- fprintf(' Root on the RHP, system is unstable. nn')
- else,end
- end