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Modal behaviour of vertical axis wind turbine comprising prestressed rotor blades: a finite element analysis


Asr, Mahdi Torabi and Masoumi, M. M. and Mustapha, Faizal (2017) Modal behaviour of vertical axis wind turbine comprising prestressed rotor blades: a finite element analysis. Pertanika Journal of Science & Technology, 25 (3). pp. 977-982. ISSN 0128-7680; ESSN: 2231-8526


Pre-stressing is a concept used in many engineering structures. In this study prestressing in the form of axial compression stress is proposed in the blade structure of H-Darrieus wind turbine. The study draws a structural comparison between reference and prestressed configurations of turbine rotor with respect to their dynamic vibrational response. Rotordynamics calculations provided by ANSYS Mechanical is used to investigate the effects of turbine rotation on the dynamic response of the system. Rotation speed ranging between 0 to 150 rad/s was examined to cover the whole operating range of commercial instances. The modal analysis ends up with first six mode shapes of both rotor configurations. As a result, the displacement of the proposed configurations reduced effectively. Apparent variations in Campbell diagrams of both cases indicate that prestressed configuration has its resonant frequencies far away from turbine operation speeds and thus remarkably higher safety factor against whirling and probable following failures.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: Universiti Putra Malaysia Press
Keywords: Finite element analysis; H-Darrieus blade; Prestressed blade; Modal analysis; Rotor dynamics; Vertical axis wind turbine
Depositing User: Nabilah Mustapa
Date Deposited: 26 Oct 2017 08:53
Last Modified: 25 Jan 2018 09:12
URI: http://psasir.upm.edu.my/id/eprint/57860
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