1. Mechanical Engineering Area, Signal Theory and Communications Department Universidad de Alcalá, Ctra. Madrid-Barcelona, Km 33,66, Alcalá de Henares 28805, Spain
2. Department of Energy and Systems Engineering, University of Pisa, Largo Lucio Lazzarino, 56122 Pisa, Italy
3. Department of Mechanical Engineering, Universidad Carlos III de Madrid, Leganés, Spain