%file name = tre_freq_obj.m
%redundant truss optimization with frequency constraints
%objective function
%Prof. Reyolando Brasil - May 2021
function f=tre_freq_obj(x,Prob_data)
%design variables
x1=x(1);%vertical bar transverse section area, m²
x2=x(2);%diagonal bar transverse section area, m²
%material parameters
rho=Prob_data(1);%density, kg/m³
%objective function, truss total mass (kg)
f=rho*(3*x1+2*sqrt(2)*x2);
%