1. University of Brasilia, UnB Gama College, Área Especial de Indústria Projeção A-UnB, Setor Leste, 72444-240, Gama-DF, Brazil e-mail:
2. Federal University of Uberlândia, Mechanical Engineering College, João Naves de Ávila Avenue, 2121, Campus Santa Mônica, Bloco 1M, 38400-902, Uberlândia-MG, Brazil e-mail: