Modular Liquid Damper System for Wind Turbine Tower Vibration Control
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Solution Overview
Problem
Existing wind turbine tower damping systems fail to effectively adjust their mass and natural frequency to match the properties of the tower, leading to severe oscillations and potential structural damage due to vortex shedding, especially at critical wind speeds.
Innovation Solution
A modular tower damper system comprising liquid dampers with adjustable natural frequency, secured to a frame structure using magnetic and suspension arrangements, allowing for easy adjustment and retrofitting to existing installations, which can be tuned to match the tower's natural frequency and reduce oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid sloshing damper is used to dampen wind turbine tower oscillations, then the damping effect is improved, but the ability to adjust mass and natural frequency is reduced
Solution Approach 1:
The damper system is divided into multiple identical liquid sloshing dampers (first liquid damper, second liquid damper, third liquid damper, fourth liquid damper) that can be independently installed and configured. Each damper contains a specific volume of liquid that determines its natural frequency, allowing the system to achieve adjustable damping characteristics through selective combination of multiple identical modular units rather than requiring each individual damper to be custom-designed with different liquid volumes.
2Reliability
If the damper system is designed to match specific tower properties, then the damping effectiveness is improved, but the complexity of installation and retrofitting is increased
Solution Approach 1:
The identical liquid sloshing dampers are designed with universal mounting capabilities that allow them to be installed in multiple locations (first mounting location, second mounting location, third mounting location) on the wind turbine tower. The standardized design with common mounting brackets and attachment mechanisms enables the same damper unit to serve multiple functions and be retrofitted to existing towers without custom fabrication, thereby maintaining damping effectiveness while simplifying installation and retrofitting processes.
3Reliability
If multiple liquid dampers are installed to increase total damping mass, then the damping capacity is improved, but the device complexity is increased
Solution Approach 1:
The system employs multiple identical liquid sloshing dampers with uniform design characteristics, including the same container dimensions, liquid volume, mounting bracket configuration, and attachment mechanism. This homogeneous approach allows for standardized installation procedures, simplified maintenance, and reduced complexity in terms of inventory management and installation training, while still achieving the required total damping capacity through quantitative multiplication rather than qualitative differentiation.
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 modular system effectively dampens wind turbine tower oscillations by synchronizing the natural frequency of the liquid dampers with the tower, reducing energy transfer and minimizing structural damage, while being adaptable for both new and existing installations.
Implementation Method 1
damping Vortex and/or operational induced oscillations of wind turbine towers
Implementation Method 2
The amplitudes of the oscillations at the critical wind speeds depend on the structural damping of the wind turbine tower
Implementation Method 3
the frequency by which the force alternates from side to side depends on the diameter of the wind turbine tower and the wind speed. At the so-called critical wind speed the frequency of the alternating forces coincides with the natural frequency of the wind turbine tower
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention relates to a damper module adapted to be secured to a wind turbine tower section, the damper module comprising at least one liquid damper secured to a frame structure, wherein each liquid damper comprises a container comprising an interior volume containing an amount of liquid, wherein the amount of liquid in the interior volume of the container sets a natural frequency of the liquid damper, and wherein the frame structure comprises an interface arrangement configured for, in cooperation with a damper module suspension arrangement in a tower section, securing the damper module to said tower section, and a liquid damper fastening arrangement configured for securing said at least one liquid damper to the frame structure. The present invention further relates to a liquid damper and a tower section having at least one damper module secured thereto.