Impulse Damper Structure for Second-Frequency Wind Turbine Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing impulse dampers are ineffective in addressing vibrations at the second natural frequency of tall, narrow structures like wind turbines, as they are primarily designed to dampen the first natural frequency.
Innovation Solution
A horizontally movable damper mass with resilient impact-damping elements on both the damper and installation sides, arranged in rotationally symmetrical impact devices, effectively counteracts vibrations by generating a restoring force through elastomer or friction elements, allowing for targeted damping of the second natural frequency without the need for a separate damper housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional impulse damper with a single impact surface is used, then the first natural frequency can be damped, but the second natural frequency remains ineffective
Solution Approach 1:
The impact device is segmented into multiple impact surfaces (first and second impact surfaces) arranged at different orientations. Each impact surface is designed to engage with corresponding damping elements at specific angles, enabling the damper to address multiple natural frequencies (first and second tower frequencies) simultaneously, thereby expanding frequency range coverage while maintaining damping effectiveness
Solution Approach 2:
The impulse damper is designed with universal functionality to dampen multiple vibration modes. By incorporating damping elements that can engage with both the first and second impact surfaces, the single damper unit serves multiple purposes - addressing both first and second natural frequencies, making it adaptable to various vibrational conditions in the tower structure
2Adaptability or versatility
If damping elements are added to handle multiple frequencies, then frequency coverage improves, but device complexity increases
Solution Approach 1:
Multiple damping elements are merged into a single integrated impulse damper assembly. The first and second damping elements are combined within the same structural framework, sharing common components such as the support structure and housing. This merging approach enables multi-frequency damping capability while avoiding the complexity of separate damper systems for each frequency
3Stability of the object's composition
If the damper mass is heavily constrained, then structural stability improves, but vibration damping effectiveness decreases
Solution Approach 1:
The damper mass is designed with dynamic characteristics, allowing it to move freely within the impulse damper housing during normal operation. The mass is only constrained when vibration forces push it against the damping elements, which then provide temporary resistance. This dynamic behavior enables the damper to remain stable structurally while maintaining effectiveness in damping vibrations through controlled, conditional constraint
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
This solution effectively reduces vibrations and noise pollution at the second natural frequency of wind turbines by distributing the impact load and minimizing structural noise, while also reducing operational costs and potential overheating issues.
Implementation Method 1
resilient impact-damping elements that have a damping effect
Implementation Method 2
a plurality of first damping elements (7), for example elastomer elements, firmly connected thereto
Implementation Method 3
allowing for targeted damping of the second natural frequency without the need for a separate damper housing
Data Source
AI summary
A novel impulse damper for reducing extreme vibrational events, in particular, in tall, narrow structures such as wind turbines. The impulse damper, according to the invention, operates on the impact-damping principle and is particularly suitable for damping the second natural frequency of the installation, preferably of the tower of a wind turbine.