EVOLUTIONARY NATURAL FREQUENCY OPTIMIZATION OF 2-DIMENSIONAL STRUCTURES WITH ADDITIONAL NONSTRUCTURAL LUMPED MASSES

Extends the evolutionary structural optimization method to the solutio n for the natural frequency optimization of a two-dimensional structur e with additional nonstructural lumped masses. Owing to the significan t difference between a static optimization problem and a structural na tural frequency optimization problem, five basic criteria for the evol utionary natural frequency optimization have been established. The inc lusion of these criteria into the evolutionary structural optimization method makes it possible to solve structural natural frequency optimi zation problems for two-dimensional structures with additional non-str uctural lumped masses. Gives two examples to demonstrate the feasibili ty of the extended evolutionary structural optimization method when it is used to solve structural natural frequency optimization problems.