Design optimization of whiffletree systems for wind turbine blade testing

Yeniceli, Süleyman Cem
In this thesis, the design optimization of a whiffletree system, which is used to simulate the loads for a selected design load case by applying discrete test loads on a wind turbine blade, is performed. Firstly, distributed design loads are calculated for the selected load case by using Microsoft (MS) EXCEL. Then, the test load optimization is performed with the Solver Add-In of the MS EXCEL to find the optimum locations of the load saddles which give the best moment distribution along the blade span according to the design loads. To simplify and generalize the test load optimization process, a tool with Graphical User Interface (GUI) is prepared with MATLAB which has built-in optimization algorithms. Genetic algorithm and gradient based optimization algorithms of MATLAB are used in hybrid form to determine the saddle locations and associated force values for test load optimization. To demonstrate the winch loading method option, which is different from the whiffletree system, and to apply developed optimization tool in a much longer blade, design loads for the NREL offshore 5-MW baseline wind turbine blade is calculated and test load optimization is performed. Finally, the whiffletree is designed to connect the primary load introduction apparatus with the saddles according to the saddle locations obtained by optimization. Results show that the developed optimization tool which makes use of the built-in optimization algorithms in MATLAB successfully determines the optimum load introduction points and associated force values both for the Whiffletree system and winch loading case.


Dynamic modelling and simulation of a wind turbine
Altuğ, Ayşe Hazal; Yavrucuk, İlkay; Department of Aerospace Engineering (2015)
In this thesis, a dynamic model for a horizontal axis wind turbine is developed for an upwind configuration using the MATLAB/Simulink environment. Blade Element Momentum Theory is used to model the rotor. It is assumed that the rotor blades are rigid and wind speed is uniform. Aerodynamic and gravitational forces are calculated as distributed loads. Verification of the model is done by using the LMS Samtech, Samcef for Wind Turbines software. Aerodynamic properties of the blades, sectional loads and moments...
Design and optimization of high torque density generator for direct drive wind turbine applications
Zeinali, Reza; Ertan, Hulusi Bülent; Department of Electrical and Electronics Engineering (2016)
In this thesis, it is aimed to design a high torque density generator for a variable speed, direct drive wind turbine application. Such a generator may reduce the size of the turbine tower and the nacelle and may provide cost advantage. For this purpose, various topologies of the permanent magnet machines in the literature are reviewed. Among the reviewed electrical machines, a magnetically geared machine introduced as a concept with high torque density and high power factor is chosen to be evaluated for th...
Genetic algorithm based aerodynamic shape optimization of wind turbine rotor blades using a 2-d panel method with a boundary layer solver
Polat, Özge; Tuncer, İsmail Hakkı; Sezer Uzol, Nilay; Department of Aerospace Engineering (2011)
This thesis presents an aerodynamic shape optimization methodology for rotor blades of horizontal axis wind turbines. Genetic Algorithm and Blade Element Momentum Theory are implemented in order to find maximum power production at a specific wind speed, rotor speed and rotor diameter. The potential flow solver, XFOIL, provides viscous aerodynamic data of the airfoils. Optimization variables are selected as the sectional chord length, the sectional twist and the blade profiles at root, mid and tip regions of...
Performance of CMS hadron calorimeter timing and synchronization using test beam, cosmic ray, and LHC beam data
Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01)
This paper discusses the design and performance of the time measurement technique and of the synchronization systems of the CMS hadron calorimeter. Time measurement performance results are presented from test beam data taken in the years 2004 and 2006. For hadronic showers of energy greater than 100 GeV, the timing resolution is measured to be about 1.2 ns. Time synchronization and out-of-time background rejection results are presented from the Cosmic Run At Four Tesla and LHC beam runs taken in the Autumn ...
Elfarra, Monier A.; Akmandor, I. Sinan; Sezer Uzol, Nilay (2011-03-25)
The main purpose of this paper is to optimize winglet geometry by using CFD with Genetic Algorithm and study its effects on power production. For validation and as a baseline rotor, the NREL Phase VI wind turbine rotor blade is used. The Reynolds-Averaged Navier-Stokes equations are solved and different turbulence models including the Spalart-Allmaras, k-epsilon Launder-Sharma, k-epsilon Yang-Shih and SST k-omega models are used and tested. The results of the power curve and the pressure distribution at dif...
Citation Formats
S. C. Yeniceli, “Design optimization of whiffletree systems for wind turbine blade testing,” M.S. - Master of Science, Middle East Technical University, 2014.