Tuned Liquid Motion Absorber for Floating Structure Vibration
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Solution Overview
Problem
Structures that float on water, such as barges and wind turbines, face challenges in withstanding oscillating motion from environmental factors like waves and wind, as static mechanical designs become overly complex, costly, and heavy.
Innovation Solution
A motion absorbing system that couples a container with liquid and an elastic element, where the elastic element's natural frequency is tuned to dampen motion, utilizing existing structures like ballast tanks and leveraging surrounding water as a slave mass to absorb and mitigate environmental-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a statics-based mechanical design is used to withstand environmental motion, then the structure can resist external forces, but the design becomes overly complex, costly, and heavy
Solution Approach 1:
The patent applies mechanical vibration principles by introducing a tuned mass damper system that utilizes the natural frequency of an elastic element to counteract environmental vibrations. The elastic element is specifically tuned to resonate at the same frequency as the expected environmental motion, creating a counter-vibration effect that reduces the net force on the structure, thereby maintaining strength without requiring complex static reinforcement
Solution Approach 2:
The patent changes the design approach from static parameter optimization to dynamic parameter tuning. By adjusting the natural frequency of the elastic element to match the environmental vibration frequency, the system dynamically adapts to withstand motion forces. This parameter tuning approach simplifies the overall design compared to static reinforcement while maintaining effectiveness
2Strength
If a statics-based mechanical design is used to withstand environmental motion, then the structure can resist external forces, but the design becomes too costly
Solution Approach 1:
By using vibration-based counteraction instead of static reinforcement, the patent reduces material requirements and manufacturing costs. The tuned mass damper system achieves motion resistance through dynamic balancing rather than brute-force structural reinforcement, leading to cost-effective implementation
Solution Approach 2:
The patent transitions from costly static design parameters to economical dynamic tuning parameters. By adjusting the frequency characteristics of existing components rather than adding expensive structural elements, the system achieves motion resistance at lower manufacturing cost
3Strength
If a statics-based mechanical design is used to withstand environmental motion, then the structure can resist external forces, but the design becomes too heavy
Solution Approach 1:
The patent uses vibration counteraction to reduce the weight burden. Instead of adding heavy static reinforcement to resist environmental forces, the tuned mass damper system uses a lightweight elastic element that dynamically counteracts forces through resonance, significantly reducing the overall weight while maintaining motion-withstanding capability
Solution Approach 2:
By changing from static weight-based resistance to dynamic frequency-based resistance, the patent eliminates the need for heavy structural reinforcement. The tuned elastic element provides equivalent motion resistance with minimal weight addition
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 system effectively reduces structural loads and vibrations, allowing for more practical and commercially viable designs by leveraging existing structures and the surrounding environment, thereby enhancing the stability and durability of floating structures.
Implementation Method 1
The elastic element has a natural frequency tuned to damp motion of the liquid
Implementation Method 2
The elastic element has a natural frequency tuned to damp motion of the liquid
Data Source
AI summary
A motion absorbing system and method for a structure includes the coupling of a container to a structure. The container has a liquid disposed therein wherein a ullage is defined above a surface of the liquid. An elastic element is positioned in the liquid. The elastic element has a natural frequency tuned to damp motion of the liquid.