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A genetic algorithm (GA) is a search process for finding approximate solutions in optimization problems. The GA provides further flexibility and robustness that are unique for signal process. In this paper we consider the development of an optimal fuzzy fractional PD + I controller in which the parameters are tuned by a GA. The performance of the proposed fuzzy fractional control is illustrated through some application examples.<\/jats:p>","DOI":"10.1155\/2014\/676121","type":"journal-article","created":{"date-parts":[[2014,5,7]],"date-time":"2014-05-07T21:16:04Z","timestamp":1399497364000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Design of Fuzzy Fractional PD + I Controllers Tuned by a Genetic Algorithm"],"prefix":"10.1155","volume":"2014","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7545-5822","authenticated-orcid":false,"given":"Isabel S.","family":"Jesus","sequence":"first","affiliation":[]},{"given":"Ramiro S.","family":"Barbosa","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2014,5,7]]},"reference":[{"volume-title":"The Fractional Calculus: Theory and Application of Differentiation and Integration to Arbitrary Order","year":"1974","author":"Oldham K. 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