xi engineering technical brief noise...xi engineering technical brief tonal noise produced by wind...
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Xi Engineering Technical Brief
Tonal noise produced by wind turbines is a serious
communities. Tonal noise emissions are subject to strong regulatory pena
complete closure of wind turbines. Xi Engineering Consultants have been solving tonal noise issues in wind turbines for over seven
years for clients throughout the United Kingdom, Europe, North America and Asia
Noise from wind turbines has two main sources;
train. Mechanical noise is produced by the
generator. These systems produce discrete vibrations at specific fre
vibrations interact with a large radiating surface
ST
AG
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ME
AS
UR
E Xi’s established process begins with a detailed vibration and acoustic survey of the tone emitting turbine by our working at
height accredited engineers. This typically takes
23m or 200m. Xi’s survey process is accurate and
with the problematic noise, which can then be linked through
pathway, and radiating surface to be established
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MO
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Following measurements, Xi establish the precise
structural-acoustic modelling techniques
from the vibration and acoustic survey.
access to supercomputing facilities for the largest and most complex of systems.
virtual test-bed to determine the best solution for the turbine and optimise the solution.
ST
AG
E 3
SO
LUT
ION
An optimal solution for one wind turbine may not be the most effective for another. Xi’s well established 3 stage process
provides the fundamental knowledge for specifying an effective and efficient solution
refined and tested in a virtual environment,
noise mitigation has seen us develop a range of tonal noise mitigation techniques, from increasing the damping of the
turbine tower to stopping frequency matching between co
frequencies below 800 Hz, especially at the traditionally challenging low frequencies, providing significant tonal
reductions, of between 8 and 15 dB.
1 MEASURE
Call Xi’s Engineering Team to discuss in confidence how to maximise
your turbine’s acoustic performance
Up to 15 dBHow Xi Mitigates Tonal Noise from Wind Turbines
Xi Engineering Technical Brief
T +44 (0)131 290 2250 E [email protected]
Tonal noise produced by wind turbines is a serious and often complex issue which can be particularly annoying to
subject to strong regulatory penalties resulting in; curtailment
Xi Engineering Consultants have been solving tonal noise issues in wind turbines for over seven
throughout the United Kingdom, Europe, North America and Asia.
Noise from wind turbines has two main sources; aerodynamic noise, and mechanical noise associated with components in the drive
the rotating machinery within the nacelle of the turbine such as th
produce discrete vibrations at specific frequencies. Problematic or excessive noise occurs when these
radiating surface such as the blades or tower walls - much like the cone of a loudspeaker system.
Xi’s established process begins with a detailed vibration and acoustic survey of the tone emitting turbine by our working at
This typically takes 1 to 3 days depending on the scale of the turbine; be it a tip height of
23m or 200m. Xi’s survey process is accurate and safe. The measurements characterise the precise frequencies associated
which can then be linked through all the measurement points
to be established.
Xi establish the precise dynamics of the tonal noise by simulating the system using
ling techniques. The model is constructed using engineering drawing
from the vibration and acoustic survey. The model analysis utilises Xi’s extensive internal computational resource with
omputing facilities for the largest and most complex of systems. Once validated, the model
bed to determine the best solution for the turbine and optimise the solution.
turbine may not be the most effective for another. Xi’s well established 3 stage process
provides the fundamental knowledge for specifying an effective and efficient solution. This solution is then
refined and tested in a virtual environment, allowing a full cost benefit analysis for all options. Xi’s success in developing
noise mitigation has seen us develop a range of tonal noise mitigation techniques, from increasing the damping of the
turbine tower to stopping frequency matching between components. Our solutions have proved extremely effective at
frequencies below 800 Hz, especially at the traditionally challenging low frequencies, providing significant tonal
reductions, of between 8 and 15 dB.
2 MODEL 3 SOLUTION
Call Xi’s Engineering Team to discuss in confidence how to maximise
your turbine’s acoustic performance
15 dB Reduction in Tonal NoiseHow Xi Mitigates Tonal Noise from Wind Turbines
Xi Engineering Technical Brief
Xi Engineering Consultants
[email protected] xiengineering.com
particularly annoying to residential
tailment, loss of yield and even the
Xi Engineering Consultants have been solving tonal noise issues in wind turbines for over seven
mechanical noise associated with components in the drive
of the turbine such as the gearbox or the
Problematic or excessive noise occurs when these
much like the cone of a loudspeaker system.
Xi’s established process begins with a detailed vibration and acoustic survey of the tone emitting turbine by our working at
1 to 3 days depending on the scale of the turbine; be it a tip height of
. The measurements characterise the precise frequencies associated
all the measurement points allowing the vibration source,
by simulating the system using our in-house
using engineering drawings and validated using data
The model analysis utilises Xi’s extensive internal computational resource with
Once validated, the model then acts as a
turbine may not be the most effective for another. Xi’s well established 3 stage process
. This solution is then optimised,
allowing a full cost benefit analysis for all options. Xi’s success in developing
noise mitigation has seen us develop a range of tonal noise mitigation techniques, from increasing the damping of the
mponents. Our solutions have proved extremely effective at
frequencies below 800 Hz, especially at the traditionally challenging low frequencies, providing significant tonal
SOLUTION
Call Xi’s Engineering Team to discuss in confidence how to maximise
oise How Xi Mitigates Tonal Noise from Wind Turbines