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function [sys,x0,str,ts] =Fz(t,x,u,flag)
switch flag,

  case 0,
    [sys,x0,str,ts]=mdlInitializeSizes(R);
    beta=345.1656;
    amp=0.8*10^(-6);
    i=beta*r;
    R=2.537*besselj(9,i)+0.43472*bessely(9,i)+3.3257*10^(-3)*besseli(9,i)+4.4643*besselk(9,i);

  case 1,
    sys=mdlDerivatives(t,x,u);

  case 3,
    sys=mdlOutputs(t,x,u,R,r);

  case 4,
    sys=[];

  case 9,
    sys=[];

  otherwise
    DAStudio.error(\'Simulink:blocks:unhandledFlag\', num2str(flag));

end

function [sys,x0,str,ts]=mdlInitializeSizes(R)

sizes = simsizes;

sizes.NumContStates  = 0;
sizes.NumDiscStates  = 0;
sizes.NumOutputs     = 1;
sizes.NumInputs      = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;   % at least one sample time is needed

sys = simsizes(sizes);

x0  = [];
str = [];
ts  = [0 0];


function sys=mdlOutputs(t,x,u,R,r)
if u>0
    h=sin(arccos((u-amp*R)/amp/R))+(1-u/amp/R)*arccos((u-amp*R)/R/amp)
else
    h=9*pi*(1-u/R/amp)
end
sys =3.68*10^6*int(h*R*r,r,0.0225,0.03);

function sys=mdlTerminate(t,x,u)

sys =9*pi*(1-u/R/amp);
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