1. Department of Mechanics and Mining and Department of Physical and Analytical Chemistry, EUP de Linares, University of Jaén, C/. Alfonso X el Sabio 28, 23700 Linares (Jaén), Spain, Department of Mechanization, CIFA “Alameda del Obispo”, Junta de Andalucía, Apdo. 3092, 14080 Córdoba, Spain, and Department of Agricultural Engineering, ETSIAM, University of Córdoba, Avda. Menéndez Pidal s/n, 14080 Córdoba, Spain