Liquid Column Damping System with Movable Walls
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Solution Overview
Problem
Existing liquid-column damping systems are structurally complex and prone to errors when attempting to adjust damping and natural frequency, making them unreliable for effective vibration reduction in buildings and other objects.
Innovation Solution
Modifying the column cross-section of at least one column by moving its walls in a direction perpendicular to the flow, allowing for adjustable inner wall panels that can be displaced relative to outer panels, thereby changing the cross-sectional area without affecting the flow direction, and using sensors and actuators to adjust the system based on measured vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If openings in the base region, liquid level adjustment, or column spacing adjustment are used to adjust damping and natural frequency, then the system can be adapted to different conditions, but the structural complexity increases and reliability decreases
Solution Approach 1:
The patent applies the dynamics principle by making the column walls movable instead of fixed. The column cross-section can be dynamically adjusted by moving the walls, which changes the liquid volume and thereby adjusts the natural frequency and damping characteristics. This dynamic adjustment mechanism is simpler and more reliable than multiple fixed configurations with openings or adjustable components in the base region.
Solution Approach 2:
The patent changes the physical parameter of the column cross-sectional area by moving the column walls. This parameter change directly affects the liquid volume in the columns, which in turn adjusts the natural frequency and damping of the system. This approach avoids the complexity of adjusting liquid levels, opening sizes, or column spacing while achieving the same adaptability.
2Adaptability or versatility
If multiple adjustment mechanisms (openings, liquid level control, column spacing) are implemented, then adaptability improves, but the system becomes more prone to errors and less reliable
Solution Approach 1:
The patent extracts the adjustment function from complex mechanisms (openings, liquid level controls, spacing adjustments) and simplifies it to a single fundamental action: moving the column walls. This extraction of the essential adjustment function to its simplest form eliminates multiple potential failure points and improves reliability while maintaining adaptability.
Solution Approach 2:
By implementing a single dynamic adjustment mechanism (movable column walls) instead of multiple static or complex adjustable components, the system achieves the required adaptability with fewer moving parts and control systems, thereby improving reliability and reducing the probability of errors.
3Adaptability or versatility
If the column cross-section is changed by moving walls perpendicular to flow direction, then the natural frequency can be adjusted without affecting the flow cross-section in the flow direction
Solution Approach 1:
The patent segments the column wall into movable and fixed portions. The column wall is divided such that it can move in a direction perpendicular to the flow to adjust the cross-sectional area, while the flow path in the flow direction remains unaffected. This segmentation allows independent control of cross-sectional area without interfering with the flow characteristics.
Solution Approach 2:
The patent employs asymmetric movement of the column wall, allowing movement only in the direction perpendicular to the flow (to adjust cross-section) while maintaining the flow direction geometry. This asymmetric design enables selective adjustment of parameters without unintended side effects on other system characteristics.
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 approach allows for reliable adjustment of the natural frequency and damping of the liquid mass, ensuring effective vibration reduction while maintaining a simple and robust system design, adaptable to varying conditions such as changes in stiffness due to temperature or structural differences.
Implementation Method 1
energy is dissipated by the effects of turbulence and the local pressure losses due to friction that form in the liquid columns or in the base region of the tank during vibration
Implementation Method 2
energy is dissipated by the effects of turbulence and the local pressure losses due to friction that form in the liquid columns or in the base region of the tank during vibration
Implementation Method 3
at least one column wall can be moved in order to change the column cross-section
Data Source
AI summary
The invention relates to a liquid column damping system, particularly for damping building vibrations, comprising a tank (B, S1, S2) filled with a liquid, said tank having, in particular, a substantially U-shaped geometry in at least one direction. At least two columns (S1, S2) of the tank arranged at a distance from each other, particularly for forming communicating liquid columns, are connected by a base region (B) of the tank, and means for adjusting the damping of the liquid column damping system and/or the natural frequency of the liquid column damping system are provided. At least one column wall region (W1) in at least one of the columns (S1, S2), preferably in all columns, can be moved in order to change the column cross-section.