timdly.m

基于ＭＡＴＬＡＢ的辅助设计 简述了矩阵分析的重要性

function [mmm,ddd] = timdly(cloop,num,den,wrang,tdly,cmpc)
%
% TIMDLY  is a function used to evaluate the frequency response of
%     a system containing a pure time delay element exp(-TDLY*s)
%     over the frequency range of WRANG.  The system is given by 
%     the open loop transfer function [NUM,DEN].     CLOOP is an
%     identifier.  The results are returned in [MMM,DDD], which 
%     are the magnitude and phase arrays of the system.
%
%        [MMM, DDD] = TIMDLY(CLOOP, NUM, DEN, WRANG, TDLY, CMPC)
%
%       MMM, DDD -- the magnitude and phase over WRANG
%       CLOOP -- identifier, see CONFIG
%       NUM, DEN -- the num and den of the system
%       WRANG -- the frequency range
%       TDLY  -- the time delay constant
%       CMPC  -- the complex form of feedback loop
%

%    Author:  Ole Barup Sorensen, Rapid Data Ltd 

%    Copyright (c) 1989-94 by Rapid Data Ltd
%    Revision 10:06  07/02/94

[mmm,ddd] = bode(num,den,wrang);
ddd = ddd - 180 / pi * tdly * wrang';
if cloop ~= 0
   j = sqrt(-1);
   ddd0 = pi/180 * ddd;
   rfr = mmm .* cos(ddd0); ifr = mmm .* sin(ddd0);
   cmpfr = rfr + j * ifr;
   cmp1 = cmpfr;
   if cloop == 1, cmp1 = cmpfr .* cmpc; end     
   cmp1 = ones(size(cmp1)) + cmp1;
   cmpfr = cmpfr ./ cmp1;
   mmm = abs(cmpfr); ddd = angle(cmpfr); ddd0 = 180/pi*ddd;
end
nc = length(ddd);
for i=1:nc
   xx = ddd(i);
   while (xx >= 0 | xx <= -360),
      xx = xx-360*sign(xx);
   end
   ddd(i) = xx;
end