(eng): We proposed a new formulation of the worst-case multiple-load problem of free material optimization. It leads to an optimization problem with bilinear matrix inequality constains. The resulting problem can be solved by a recently developed code PENBMI. The new formulation is shown to be more computationally efficient than the recently used one.

(cze): Navrhujeme novou formulaci problemu volne optimalizace materialu s vice zatezovacimi stavy, ktera vede k optimalizacnimu problemu s bilinearnimi maticovymi nerovnostmi. Tento problem muze byt resen programem PENBMI. Ukazeme, ze nova formulace je vypoctove efektivnejsi nez zname formulace pouzivane doposud.