1 / 9 C. Heilmann, EWEA 2013 Annual Event, Vienna, 4 – 7 February 2013 REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS Dr. Christoph Heilmann 1 (Presenter), Anke Grunwald 1 , Michael Melsheimer 1 , Prof. Dr. Jochen Twele 2, 3 , Norman Pieniak 2 , Jonathan Amme 3 1: BerlinWind GmbH ([email protected]) 2: Reiner Lemoine Institut gGmbH ([email protected]) 3: Hochschule für Technik und Wirtschaft – University of Applied Sciences ([email protected]) 4 6 3 1 2 5 7 8 n
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REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS
REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS. Dr. Christoph Heilmann 1 (Presenter), Anke Grunwald 1 , Michael Melsheimer 1 , Prof. Dr. Jochen Twele 2, 3 , Norman Pieniak 2 , Jonathan Amme 3 1: BerlinWind GmbH ([email protected]) - PowerPoint PPT Presentation
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REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS
Content
Investigated vertical-axis small wind turbine (SWT) and vibration measuring system
Potential vibrations systems at SWT and excitation Campbell-diagram of excitation and natural frequencies Measured vibration signals during operation Evaluation of amplitudes produced by rotor speed and harmonics Conclusions
REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS
Investigated vertical-axis small wind turbine (SWT)
Gravity foundations
Minimast
Rotor blades
Generator, tower connection with dampers
Blade holders
Speed sensor
Accelerometers
Wind vane & cup anemometer
Accelerometers
Long braces
Clamp
BalustradeShort braces
Foot braces
Steel tower
Strain gauges
Elevator house
End disk
AccelerometersWEST
NORTH
Measuring system box
Power: 600 W Rotor: 1.9 x 1.9 m Hub height: 6 m Tower support by long and
short braces Gravity foundation: 660 kg each Gap between tower bottom and roof Steel framework roof, 7 floor building Mobile vibration measuring system
REDUCING VIBRATION ISSUES AT SMALL VERTICAL-AXIS WIND TURBINES ON BUILDINGS
Conclusions
Dynamics of variable-speed vertical-axis SWT very complex
Harmonics produce resonance issues, despite sub-critical rotor speed
Additional vibration systems formed by SWT components may amplify vibration by their resonance
Total system of SWT and building relevant for resonance issues
SWT design including dynamic analysis imperative, professional manufacture, siting (including dynamics) and installation as well
Recommendations for the investigated SWT:- Fixing gravity foundations - Two-plane rotor balancing due to mass imbalance above limit - Removal of top dampers- Pre-tensioned guy wires instead of long braces
Development of compact load measuring system and sophisticated evaluation software for SWT vibration analysis in process