[1] Edinburgh Napier Univ, Sch Engn & Built Environm, Mech & Mat Engn Dept, Edinburgh EH10 5DT, Midlothian, Scotland
[2] Univ Strathclyde, Wind Energy Syst Ctr Doctoral Training, Elect & Elect Engn Dept, Royal Coll Bldg, Glasgow G1 1XW, Lanark, Scotland
[3] Univ Strathclyde, Naval Architecture Ocean & Marine Engn Dept, Henry Dyer Bldg, Glasgow G4 0LZ, Lanark, Scotland