Wind Turbine Nacelle Noise Monitoring via Transfer Function
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Solution Overview
Problem
Current methods for measuring and controlling acoustic noise from wind turbines are limited by the need for ground-level microphone measurements, which are not suitable for real-time monitoring and optimization, hindering the design and operation of wind turbines within noise regulation limits.
Innovation Solution
An acoustic noise monitoring system with microphones mounted on the wind turbine nacelle, processing and correlating noise data using transfer functions to match remote measurements, allowing continuous monitoring and real-time control of operating parameters to optimize power output within noise limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground-level microphone measurements are used according to international standards, then acoustic noise limits can be verified, but real-time monitoring and continuous optimization are not possible
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transfer functions that relate nacelle-mounted microphone measurements to ground-level measurements. These transfer functions are determined beforehand through comparative measurements, allowing real-time conversion of nacelle data to equivalent ground-level noise levels without requiring actual ground measurements at the time of monitoring.
Solution Approach 2:
The patent uses an intermediary approach by introducing a transfer function as a mathematical mediator between the easily obtainable nacelle-mounted microphone data and the required ground-level noise measurements. This transfer function acts as a bridge that translates measurements from one location to another, enabling real-time monitoring while maintaining measurement accuracy requirements.
2Reliability
If ground-level measurements are conducted over several hours, then comprehensive noise assessment is achieved, but continuous monitoring for optimization purposes is prevented
Solution Approach 1:
The patent implements feedback by continuously monitoring acoustic noise through nacelle-mounted microphones and using the processed noise data to adjust wind turbine operating parameters in real-time. The control system receives continuous noise level information and adjusts parameters such as rotor speed, blade pitch, or power output to maintain noise within acceptable limits while maximizing energy production.
Solution Approach 2:
The patent applies dynamics by transitioning from static, periodic ground-level measurements to dynamic, continuous monitoring using nacelle-mounted microphones. The system continuously adapts to changing operating conditions and noise levels, enabling real-time optimization of the balance between noise compliance and energy production rather than relying on fixed measurement intervals.
3Productivity
If nacelle-mounted microphones are used for continuous monitoring, then real-time noise data is obtained, but correlation with remote ground-level measurements is required
Solution Approach 1:
The patent reduces processing complexity by performing preliminary calculations to establish transfer functions before actual monitoring begins. These pre-computed transfer functions encapsulate the complex relationship between nacelle and ground-level measurements, allowing simple real-time application during operation without requiring complex iterative processing or multiple simultaneous measurements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous, accurate monitoring and optimization of wind turbine noise levels, allowing increased power output and extended operation while adhering to noise regulations, by synchronizing noise and operating condition data and adjusting parameters like load, pitch, and power output.
Implementation Method 1
at least one microphone for monitoring acoustic noise
Data Source
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AI summary
The present invention relates to an acoustic noise monitoring system for a wind turbine, comprising: a microphone for monitoring acoustic noise, the microphone adapted to be mounted to the exterior of a wind turbine nacelle; an input, the input adapted to receive operating conditions data from a wind turbine; a processor, the processor adapted to receive data from the microphone and the input; and storage memory, adapted to store the acoustic noise data and the operating conditions data. The processor is adapted to apply a transfer function to said acoustic noise data to correlate said data with a set of acoustic noise data measured at a remote location from the wind turbine. The system may comprise a controller adapted to generate a control signal, for outputting to a wind turbine controller, for adjusting the operating parameters of the wind turbine in dependence on said correlated data.