developing solutions to tonal noise from wind turbines using … · 2016. 11. 18. · to tower...
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Developing solutions to tonal noise from
wind turbines using COMSOL Multiphysics Dr Jutta Stauber
Comsol Conference 2016, 14.10.16
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Introduction Tonal noise can be caused by
frequency matching between tower and rotating components in drive train
Tonal noise from wind turbines can lead to health issue
→ Strict regulatory penalties
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Introduction Possible mitigation retrofitting
solutions: Limit rotor speed
Constrained layer damping
Tuned mass dampers
Mitigation solution modelled here based on advanced particle damping
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Advance Particle Dampers Containers filled with EniDampTM,
an advance particle damping material (so-called APD pods)
APD pods magnetically attached to tower walls
Broadband damper
Mass of APD pods 5% of active mass of tower Ott M, Weisbeck J, Gerges SNY, Bustamante, M. The
effectiveness of particle damping for use on vertical surfaces; Proc INTER-NOISE 2014; 16-19 November; Melbourne, Australia 2014
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Experimental data for APD pods Aim: determine structural
parameters of APD on tower
APD pod on 1m x 1m x 12 mm steel plate
Apply force by shaker Measure surface
acceleration at 12 sensors
APD pod
Shaker
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Model of APD pod as part of tower Determine structural properties:
Density (combined mass of place and APD pod)
Young’s Modulus not changed by presence of APD pod
Damping ratio as a function of frequency
→ determine reduction of surface acceleration of tower
Shaker
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Structural-acoustic model Structural model to determine acceleration of
blades and tower Acoustic models for the sound pressure level
(SPL) from tower and blades Structural-acoustic model to deteremine the
surface acceleration of nacelle and SPL in far field
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Model Structural model of tower and
blades: Tower, blades, drive train, foundation May include APD pods on tower wall Shell, beam and solid elements Excited using force related gear
meshing
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Model Structural-acoustic model of
nacelle: Nacelle walls with air domain
with perfectly matched layer (PML)
Shell elements Coupled to component 1
through Multiphysics coupling
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Model Determine surface
acceleration of tower wall Determine sound pressure
level (SPL) at observer position (tip height) from: SPL from tower SPL from nacelle SPL from each of the
blades
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Results – Surface acceleration
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Results – SPL contribution
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Results – SPL
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Conclusions Placement of APD pods increases damping
properties of tower wall leading to reduction in tonal noise
Increase tonal reductions by optimising APD pod placement
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Thank you for listening!
Dr Jutta Stauber Project Engineer
Xi Engineering Consultants Email: [email protected]
Tel: +44 (0)131 290 2252
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Broadband – Surface Acceleration
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Broadband - SPL