Inflatable Wind Turbine Blade Vibration Mitigation
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Solution Overview
Problem
Wind turbine blades experience excessive vibrations when parked, leading to potential damage and reduced lifespan due to varying wind conditions, which existing control systems cannot effectively mitigate during installation, commissioning, or maintenance periods.
Innovation Solution
A vibration mitigating device comprising inflatable bodies and air flow modifying elements, controlled by a sensor system, is arranged around the wind turbine blade to adjust inflation levels and modify airflow, reducing vortex and stall-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wind turbine blades are made increasingly longer to capture more wind energy, then energy capture capability is improved, but blade flexibility and susceptibility to vibrations increase
Solution Approach 1:
The patent introduces an intermediary device (vibration mitigating device) between the wind turbine blade and the harmful wind forces. This device includes inflatable bodies and air flow modifying elements that act as a mediator to reduce the direct impact of wind-induced vibrations on the blade structure, thereby enabling longer blades to operate reliably.
Solution Approach 2:
The patent employs pneumatic elements (inflatable bodies) that can be filled with gas or fluid to provide vibration mitigation. The inflatable bodies expand or contract in response to wind conditions, using pneumatic pressure to counteract vibrations and reduce stress on the blade, thus resolving the contradiction between blade length and vibration resistance.
2Adaptability or versatility
If the wind turbine is parked or stopped for installation, commissioning, or maintenance, then operational flexibility is improved, but exposure to vibrations and wind damage increases
Solution Approach 1:
The patent implements a dynamic vibration mitigating device that can adapt its state based on operational conditions. The inflatable bodies can be inflated or deflated, and air flow modifying elements can be adjusted, allowing the system to provide vibration protection when parked or stopped while maintaining operational flexibility during different phases of installation, commissioning, or maintenance.
Solution Approach 2:
The patent changes physical parameters of the vibration mitigating device (such as inflation level of inflatable bodies, position of air flow modifying elements) in response to wind conditions and operational state. This allows the device to optimize vibration mitigation during parked periods while allowing operational flexibility when the turbine needs to be installed, commissioned, or maintained.
3Reliability
If a vibration mitigating device with inflatable bodies is used to reduce blade vibrations, then blade stress and vibration damage are reduced, but device complexity and installation requirements increase
Solution Approach 1:
The patent uses flexible inflatable bodies that can be collapsed into compact forms for storage and transport, then inflated at the installation site to provide vibration mitigation. This approach reduces the physical footprint and simplifies installation compared to rigid vibration damping structures, thereby reducing device complexity while maintaining blade stress reduction capabilities.
Solution Approach 2:
The vibration mitigating device incorporates self-regulating mechanisms where the inflatable bodies and air flow modifying elements automatically adjust their configuration in response to wind conditions and vibration levels. This self-service capability reduces the need for complex external control systems and manual intervention, thereby simplifying the overall device structure while maintaining effective blade stress reduction.
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
The device effectively mitigates vibrations by adapting to changing wind conditions, enhancing reliability and reducing blade stress, while maintaining operational flexibility and ease of installation.
Implementation Method 1
The pressure source is configured to inflate and/or deflate one or more of the inflatable bodies based on measurements of a sensor system
Implementation Method 2
The vibration mitigating device comprises one or more inflatable bodies and one or more air flow modifying elements
Data Source
AI summary
An assembly and associated method of operation for a wind turbine blade of a wind turbine includes a vibration mitigating device configured to be arranged around the blade. The vibration mitigating device includes a main body configured to extend chord-wise around and encircle the blade, the main body having at least one inflatable body. Inflatable air flow modifying elements extend radially outward from the main body. A pressure source is connectable to the inflatable body and the air flow modifying elements to inflate the inflatable body and the airflow modifying elements based on measurements of a sensor system that monitors a condition of the wind turbine or an environmental condition around the wind turbine.