Author: Dr. David MalcolmPublication: Wind Harvest InternationalYear Published: 2023 This report brings together much of the structural and performance data from the operation of the Wind Harvester 3.1. The response at three of the sensors is examined in detail (the lower mast bending, lower mast torque, the bending in the middle of the upper blade,…
Author: Christos Galinos, Torben Larsen, Helge Madsen, Uwe PaulsenPublication: Energy ProcediaYear Published: 2016 The paper studies the applicability of the IEC 61400-1 ed.3, 2005 International Standard of wind turbine minimum design requirements in the case of an onshore Darrieus VAWT and compares the results of basic Design Load Cases (DLCs) with those of a3-bladed HAWT.…
Author: Daniel ArayaPublication: California Institute of TechnologyYear Published: 2016 Within a wind farm, multiple turbine wakes can interact and have a substantial effect on the overall power production. This makes an understanding of the wake recovery process critically important to optimizing wind farm efficiency. Vertical-axis wind turbines (VAWTs) exhibit features that are amenable to dramatically…
Author: K. McLaren, S. Tullis and S. ZiadaPublication: McMaster UniversityYear Published: 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…
Author: David MalcolmPublication: Wind Harvest InternationalYear Published: 2017
Author: Thomas Carne, D.R. Martinez, S.R. IbrahimPublication: Sandia National LaboratoriesYear Published: 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…
Author: David MalcolmPublication: Engineering StructuresYear Published: 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…
Author: Paul S. Veers, Herbert J. Sutherland, Thomas D. AshwillPublication: Sandia National Laboratories Wind turbines must withstand harsh environments that induce many stress cycles into their components. A numerical analysis package is used to illustrate the sobering variability in predicted fatigue life with relatively small changes in inputs. The variability of the input parameters is…
Author: Paul VeersPublication: Sandia National LaboratoriesYear Published: 1981 A cursory analysis of the stress history of wind turbine blades indicates that a single stress level at each wind speed does not adequately describe the blade stress history. A statistical description is required. Blade stress data collected from the DOE/ALCOA Low cost experimental turbines indicate that…
Author: Paul VeersPublication: Sandia National LaboratoriesYear Published: 1983 The fatigue life of wind turbine blades that are exposed to the random loading environment of atmospheric winds is described with random data analysis procedures. The incident wind speed and the stresses caused by these winds are expressed in terms of probability density functions, while the fatigue…