Auto-Tuned Pendulum Damper for Wind Tower Oscillations
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Solution Overview
Problem
Wind turbine towers experience severe oscillations due to vortex shedding, especially during construction, which can lead to significant deflections without adequate damping measures.
Innovation Solution
An automatically tuned mass damper unit is provided, comprising a pendulum structure suspended by adjustable wires, equipped with sensors and tuning means to adjust its natural frequency in real-time to match the tower's frequency, thereby optimizing damping effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If no additional damping is added to the wind turbine tower, then the structural damping remains low and simple, but the oscillations can result in severe deflections of the wind turbine tower
Solution Approach 1:
The damper unit employs a dynamically adjustable pendulum structure where the natural frequency can be changed in real-time through wire length adjustment. This allows the damping system to adapt to varying tower oscillation frequencies, particularly during construction phases when the tower's natural frequency may change. The dynamic adjustment capability enables effective damping without requiring an overly complex fixed-frequency system.
Solution Approach 2:
The system incorporates sensors that continuously monitor tower oscillations and provide feedback to the control unit. Based on this feedback, the control unit automatically adjusts the pendulum's natural frequency by modifying wire lengths, creating a closed-loop control system. This feedback mechanism ensures optimal damping performance while avoiding the need for complex manual tuning or oversized damping components.
2Reliability
If an automatically tuned mass damper is used to optimize damping effects, then the damping performance is improved, but the device complexity increases due to sensors and tuning mechanisms
Solution Approach 1:
The damper unit is designed to be self-regulating through automatic tuning. The control unit autonomously processes sensor data and adjusts the pendulum wire lengths without requiring external intervention. This self-service capability maintains high damping effectiveness while minimizing operational complexity, as the system automatically adapts to changing conditions during tower construction and operation.
Solution Approach 2:
The system achieves optimized damping by dynamically changing the physical parameters of the pendulum structure, specifically the wire lengths that determine the natural frequency. By adjusting these parameters in response to measured tower oscillations, the system maintains optimal damping effectiveness across varying operational conditions without requiring a completely complex reconfiguration mechanism.
3Productivity
If the natural frequency of the pendulum structure is adjusted to match the tower frequency, then the damping effect is optimized, but the system requires continuous monitoring and adjustment
Solution Approach 1:
The system uses sensors to continuously monitor tower oscillation frequency and provides real-time feedback to the control unit. This feedback enables automatic adjustment of the pendulum's natural frequency by modifying wire lengths, ensuring the damping system remains synchronized with the tower's oscillation characteristics without manual intervention.
Solution Approach 2:
The system replaces manual frequency tuning with an automated control mechanism that uses electronic sensors and actuators. The control unit processes sensor data and automatically adjusts the pendulum wire lengths, substituting mechanical manual adjustment with an automated electromechanical system that improves damping efficiency while managing the complexity of continuous monitoring and adjustment.
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 solution effectively reduces tower oscillations by continuously optimizing the natural frequency of the pendulum structure to match the tower's frequency, minimizing deflections and ensuring robust damping even at critical wind speeds.
Implementation Method 1
a pendulum structure, a suspension arrangement for suspending the pendulum structure from the damper unit structure such that the pendulum structure is allowed to displace from a neutral position
Implementation Method 2
a sensor adapted for measuring movements of the tower structure
Implementation Method 3
tuning means configured for adjusting the natural frequency of the suspended pendulum structure in response to measured movements of the tower structure
Implementation Method 4
an automatically tuned mass damper configured to adjust the natural frequency of the suspended pendulum structure in response to measured movements of the tower structure
Data Source
AI summary
The present invention relates to a damper unit for damping oscillations of a tower structure when secured thereto, the damper unit comprising a damper unit structure adapted for attachment to the tower structure, a pendulum structure, a suspension arrangement for suspending the pendulum structure from the damper unit structure such that the pendulum structure is allowed to displace from a neutral position for the pendulum structure, the suspension arrangement comprising one or more wires for suspending the pendulum structure, a sensor adapted for measuring oscillations of the tower structure, and tuning means configured for adjusting the natural frequency of the suspended pendulum structure in response to measured oscillations of the tower structure. The present invention further relates to an associated method.