Frequency Response

Dynamic Response of a Darrieus Rotor Wind Turbine Subject to Turbulent Flow

D. J. Malcolm, Engineering Structures, April 1988

A method is presented for the frequency response analysis of a Darrieus rotor wind turbine subject to turbulent flow. A number of time series vectors of longitudinal and lateral turbulent velocities are generated and the interaction with a two-bladed rotor is carried out with a double multiple streamtube model. The resulting time domain loads are transformed into the frequency domain in terms of components of a real set of eigenvectors of the rotor.

Modal Identification of a Rotating Blade System

T.G. Carne, D.R. Martinez, S.R. Ibrahim, Sandia National Laboratories, 1983

A new testing technique and the Ibrahim time domain (ITD) modal identification algorithm have been combined, resulting in a capability to estimate modal parameters for rotating blade systems. This capability has been evaluated on the Sandia two-meter, vertical-axis wind turbine. Variation in modal frequencies as a function of rotation speed has been experimentally determined from 0 rpm (parked) to 800 rpm. Excitation of the rotating turbine was provided by a scheme which suddenly released a pretensioned cable, thus plucking the turbine as it rotated. The structural...

Vibration Analysis of a Vertical Axis Wind Turbine Blade

K. McLaren, S. Tullis and S. Ziada, McMaster University, 2007

The motivation for this project arose from an expected vibration source of a small-scale vertical axis wind turbine currently undergoing field-testing. The turbine consists of three 3-metre long vertically aligned blades each fixed to the central shaft by two horizontal arms and separated from one another by an angle of =120º. The blade profile is a NACA 0015 with a chord length of 0.4 metres fixed at zero angle of attack to the support arms. The turbine optimally operates at a blade-tip speed ratio (the ratio of the blade rotational velocity to the ambient wind velocity) of 1.6. As the blades turn about the...

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