Trihedral lattice towers geometry optimization

The problem of trihedral lattice towers geometry optimization, the width which varies linearly with height, has been considered. variable parameters were support at base and top point, as well cross-sectional areas chords. A restriction was introduced on mass constancy. objective function potential strain energy, maximum displacement first frequency natural vibrations. In second cases optimum corresponds to minimum function, in third - maximum. solution performed by finite element method combination four nonlinear optimization methods: interior point method, surrogate genetic algorithm pattern search method. efficiency each listed methods compared authors.