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Dynamic response of a darrieus rotor wind turbine subject to turbulent flow
Abstract 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. The structural analysis is carried out using a modal frequency response solution of MSC NASTRAN and a random loading routine. Some DMAP modifications are necessary in order to present power spectra in terms of modal rather than physical degrees of freedom. The spectra of some of the modal loads applicable to the Indal 6400 rotor are examined. Some numerical results are also presented for that rotor and a comparison with field data is made. The model correctly predicts the observed response of the fundamental in-plane blade bending modes to stochastic loading. The procedure appears to be both economic in computing resources and able to simulate observed behaviour. It promises to be a useful tool in the design of Darrieus rotors against fatigue damage.
Dynamic response of a darrieus rotor wind turbine subject to turbulent flow
Abstract 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. The structural analysis is carried out using a modal frequency response solution of MSC NASTRAN and a random loading routine. Some DMAP modifications are necessary in order to present power spectra in terms of modal rather than physical degrees of freedom. The spectra of some of the modal loads applicable to the Indal 6400 rotor are examined. Some numerical results are also presented for that rotor and a comparison with field data is made. The model correctly predicts the observed response of the fundamental in-plane blade bending modes to stochastic loading. The procedure appears to be both economic in computing resources and able to simulate observed behaviour. It promises to be a useful tool in the design of Darrieus rotors against fatigue damage.
Dynamic response of a darrieus rotor wind turbine subject to turbulent flow
Malcolm, D.J. (author)
Engineering Structures ; 10 ; 125-134
1988-01-01
10 pages
Article (Journal)
Electronic Resource
English
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