Jacket Foundation Tuned Liquid Damping for Natural Frequency Control
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Solution Overview
Problem
Existing offshore wind turbine jacket foundations face challenges in adjusting their natural frequency and motion damping due to fixed liquid storage volumes and narrow damping frequency ranges, which can lead to resonance and reduced operational stability under dynamic loads.
Innovation Solution
A tuned liquid damper system with a central and distributed liquid tanks, flow monitoring and control system, and acceleration data acquisition, allowing real-time adjustment of liquid storage volumes and mass distribution to control the natural frequency and damping of the foundation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a closed water tank is used in the tuned liquid damper system, then the liquid storage volume and liquid level are fixed, but the effective damping frequency range becomes narrow and cannot be adjusted in real time
Solution Approach 1:
The patent transforms the fixed liquid tank system into a dynamic adjustable system by introducing pumps and control mechanisms that allow real-time modification of liquid volume and level in the tanks. This enables the damping frequency to be dynamically adjusted according to changing external load frequencies, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent changes the parameters of the liquid tank system by allowing variable liquid storage volumes and adjustable liquid levels through controlled pumping. This parameter adjustment capability enables the system to adapt to different damping frequency requirements while maintaining a manageable system structure.
2Adaptability or versatility
If the liquid storage volume and liquid level are fixed in the tuned liquid damper system, then the system structure is simple, but the effective damping frequency range is narrow
Solution Approach 1:
The patent implements a control system that automatically adjusts liquid parameters based on detected vibration characteristics, eliminating the need for manual intervention. The system self-regulates by using sensors to monitor structural response and automatically activating pumps to adjust liquid volume and level, thereby expanding the damping frequency range while maintaining ease of operation.
Solution Approach 2:
The patent introduces a feedback mechanism where acceleration sensors detect the natural frequency of the jacket structure, and this information is fed back to the control system to automatically adjust the liquid tank parameters. This closed-loop feedback enables the system to adapt to varying damping frequency requirements without complex manual operation.
3Adaptability or versatility
If connected ballast tanks with adjustable liquid reserves are used, then the system can adjust mass distribution, but the design is mainly aimed at floating wind turbine platforms rather than jacket foundations
Solution Approach 1:
The patent designs a tuned liquid damper system that is universally applicable to both floating wind turbine platforms and jacket foundations. By using a modular tank configuration that can be installed on existing jacket structures and incorporating adjustable liquid volume control, the system achieves multi-functionality and eliminates the need for separate designs for different foundation types, thereby improving ease of manufacture and deployment.
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
Enables rapid and effective adjustment of natural frequency and motion damping, minimizing the impact of external loads on structural stability while being environmentally friendly and convenient for construction and operation.
Implementation Method 1
a tuned liquid damper is a system composed of water tank and liquid therein, which can attenuate the vibration of main structure through liquid inertia force and dynamic pressure difference
Implementation Method 2
a tuned liquid damper is a system composed of water tank and liquid therein, which can attenuate the vibration of main structure through liquid inertia force and dynamic pressure difference
Implementation Method 3
each pipeline is provided with a flowmeter and controls liquid transportation by a pump
Implementation Method 4
the acceleration data acquisition and analysis system includes acceleration acquisition devices and a data processing system; the acceleration acquisition devices are arranged at key nodes of the jacket foundation and transmit the acquired data to the data processing system
Data Source
AI summary
An offshore wind turbine jacket foundation capable with adjustable natural frequency and motion damping and a control method, comprising: a jacket; a tuned liquid damper system, comprising a central liquid tank communicated with seawater and distributed liquid tanks, wherein the central liquid tank and the distributed liquid tanks carry out liquid delivery through pipelines; a flow monitoring and control system configured to obtain storage information of each liquid tank by data acquisition; an acceleration data acquisition and analysis system configured to acquire acceleration data at key nodes of the jacket foundation; the pump on each pipeline is controlled based on the obtained data to realize the redistribution adjustment of the liquid storage and liquid level of each liquid tank in the damper system in a short time, and the mass distribution of the jacket structure as a whole is adjusted, so as to adjust the natural frequency and motion damping.