1. Department of Aerospace and Mechanical Engineering (LTAS); University of Liège Chemin des Chevreuils; 1 (B52/3); 4000 Liège; Belgium
2. INRIA Rhône-Alpes, Centre de recherche Grenoble; 655 avenue de l'Europe, Inovallée de Montbonnot; 38334 St Ismier Cedex; France