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Article

The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades

1
School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
2
Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
3
Department of Aerospace Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE
*
Author to whom correspondence should be addressed.
Received: 2 November 2020 / Revised: 23 November 2020 / Accepted: 25 November 2020 / Published: 29 November 2020
(This article belongs to the Special Issue Dynamics of Composite Wind Turbine Rotor Blades)
This paper investigates the effectiveness of a resonance avoidance concept for composite rotor blades featuring extension–twist elastic coupling. The concept uses a tendon, attached to the tip of the blade, to apply a proper amount of compressive force to tune the vibration behavior of the blade actively. The tendon is simulated by applying a non-conservative axial compressive force applied to the blade tip. The main load carrying part of the structure is the composite spar box, which has an antisymmetric layup configuration. The nonlinear dynamic behavior of the composite blade is modelled by using the geometrically exact fully intrinsic beam equations. The resulting nonlinear differential equations are discretized using a time–space scheme, and the stationary and rotating frequencies of the blade are obtained. It is observed that the proposed resonance avoidance mechanism is effective for tuning the vibration behavior of composite blades. The applied compressive force can shift the frequencies and the location at which the frequency veering take place. Furthermore, the compressive force can also cause the composite blade to get unstable depending on the layup ply angle. Finally, the results, highlighting the importance of compressive force and ply angle on the dynamic behavior of composite blades, are presented and discussed. View Full-Text
Keywords: free vibration; composite blade; non-conservative force; stability; extension–twist elastic couplings free vibration; composite blade; non-conservative force; stability; extension–twist elastic couplings
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MDPI and ACS Style

Amoozgar, M.; Bodaghi, M.; Ajaj, R.M. The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades. Vibration 2020, 3, 478-490. https://0-doi-org.brum.beds.ac.uk/10.3390/vibration3040030

AMA Style

Amoozgar M, Bodaghi M, Ajaj RM. The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades. Vibration. 2020; 3(4):478-490. https://0-doi-org.brum.beds.ac.uk/10.3390/vibration3040030

Chicago/Turabian Style

Amoozgar, Mohammadreza, Mahdi Bodaghi, and Rafic M. Ajaj 2020. "The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades" Vibration 3, no. 4: 478-490. https://0-doi-org.brum.beds.ac.uk/10.3390/vibration3040030

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