function vtb5_6(mu,rmin,rmax)%VTB5_6 Surface plot of the normalized amplitude of the primary%mass for a damped absorber design.%  VTB5_6(mu,rmin,rmax) displays the 3-D plot for normalized%  amplitude for a given value of mu.  The function is plotted%  between the normalized frequencies rmin and rmax, with the%  damping ratio ranging from 0 to 1.r=rmin:(rmax-rmin)/20:rmax;z=.05:.025:1;[r,z]=meshdom(r,z);num=4*z.^2+r.^2;den1=4*z.^2 .*(r.^2+mu*r.^2-1).^2;den2=((r.^2-1).^2).*r.^2;f=sqrt(num./(den1+den2));  %equation 5.42mesh(f)ropt=sqrt(2/(2+mu));zopt=1/sqrt(2*(mu+1)*(mu+2));text(.10,.85,['The optimal frequency ratio = ',num2str(ropt)],'sc')text(.10,.80,['The optimal damping ratio = ',num2str(zopt)],'sc')text(.48,.17,num2str(rmin),'sc')text(.92,.31,num2str(rmax),'sc')text(.43,.17,'0','sc')text(.06,.39,'1','sc')text(.60,.23,'normalized frequency - r','sc')text(.15,.23,'damping ratio - zeta','sc')title('Normalized magnitude of the primary mass')