Fuzzy maintenance costs of a wind turbine pitch control device Mariana Carvalho | Eusébio Nunes | José Telhada | Show more Mariana Carvalho Portugal Polytechnic Institute of Cávado and Ave Eusébio Nunes Portugal University of Minho José Telhada Portugal University of Minho Submitted: 2014-10-16 | Accepted: 2015-02-28 | Published: 2015-07-10 DOI: https://doi.org/10.4995/ijpme.2015.3318