Wind Turbine Damper With Particulate Fill for Tonal Noise Damping
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Solution Overview
Problem
Existing wind turbine drivetrain designs face challenges in efficiently damping vibrations, particularly tonal noise, due to the high cost and complexity of integrating effective dampers, which also incur maintenance and replacement costs.
Innovation Solution
A structurally simple 'noise damping box' is mounted around vibrating components, featuring an enclosing structure with an interior cavity filled with energy-absorbing particulate matter, allowing for easy assembly and adjustment to tune vibrational behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive elastomer and hydraulic dampers are used to effectively dampen drivetrain vibrations, then vibration damping performance is improved, but cost and device complexity increase
Solution Approach 1:
The patent replaces expensive elastomer and hydraulic dampers with a simple steel ball drop damper that uses basic mechanical components (steel balls, guide channels, springs) to achieve effective vibration damping. The design prioritizes simplicity and low cost over long component life, accepting that the damper may need periodic refilling or replacement while significantly reducing overall system complexity and cost.
Solution Approach 2:
The patent substitutes complex hydraulic and elastomeric mechanical systems with a simpler gravity-based mechanical system using falling steel balls. The damping mechanism relies on gravitational potential energy conversion and kinetic energy dissipation through ball impact, eliminating the need for hydraulic fluid, seals, and complex elastomer formulations while achieving comparable or superior damping effectiveness.
2Reliability
If traditional dampers are integrated into the drivetrain design, then vibration damping is achieved, but integration difficulty and design time increase
Solution Approach 1:
The damper is designed as a modular component with distinct functional elements (guide channels, steel ball reservoir, spring mechanism) that can be manufactured separately and assembled into the drivetrain. This segmentation allows the damper to be integrated as a discrete unit rather than requiring complex redesign of existing drivetrain components, significantly easing manufacturing and installation processes.
Solution Approach 2:
The damper components, particularly the guide channels and steel ball reservoir, are pre-assembled and pre-tested as a complete functional unit before integration into the drivetrain. This preliminary assembly ensures proper fit and function, reducing on-site installation complexity and design iteration requirements while maintaining effective vibration damping performance.
3Reliability
If large anchoring points are designed into the drivetrain housing and nacelle bedplate, then effective damper anchoring is achieved, but fatigue loads and maintenance costs increase
Solution Approach 1:
The damper design uses the weight of the steel balls themselves as the anchoring mechanism, with the balls contained within a housing that is secured to the drivetrain component. The gravitational force on the balls provides the damping action while the housing requires minimal anchoring points, reducing fatigue loads on the drivetrain structure. The anchoring system is designed to accommodate the damper's operational movements without creating high-stress concentration points.
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 damping box effectively reduces structural vibrations and tonal noise by altering the inertia of the component and passively dissipating kinetic energy, offering a cost-effective, low-maintenance solution that can be retrofitted into existing systems.
Implementation Method 1
The energy-absorbing material comprises a particulate matter, preferably a particulate matter with irregular particle shapes
Implementation Method 2
The effect of the inventive damping box is to add mass to the vibrating component, thereby altering the inertia of the component. This in turn alters the vibration frequency of the component during operation of the machinery
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention describes a damper (1) mounted about a component (22, 23, 24, 25), which damper (1) comprises an enclosing structure (11) shaped to fit about the component (22, 23, 24, 25); an interior cavity (10) defined by the enclosing structure (11) and a surface (231S, 225, 25S) of the component (22, 23, 24, 25); and a quantity of energy-absorbing material (15) in the interior cavity (10) of the damper (1), which energy-absorbing material (15) comprises a particulate matter, preferably a particulate matter with irregular particle shapes. The invention further describes a method of assembling such a damper, and a wind turbine comprising a number of such dampers.