Fluid-Filled Vibration Damper with Adjustable Frequency Tuning
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Solution Overview
Problem
Current vibration dampers, such as tuned liquid dampers and tuned liquid column dampers, have limited flexibility in adjusting their operating frequency, requiring complex redesigns for larger changes, and often have a large installation footprint, making them unsuitable for various applications.
Innovation Solution
A frequency-tunable vibration damper design featuring a first container with rigid and compliant wall regions, coupled to a second container with a flow restrictor and filled with fluid and gas, allowing for adjustable frequency tuning through compliant wall movement and gas chamber adjustments without altering the container's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the geometry of the tank or tube is modified to adjust the operating frequency, then the frequency can be tuned within a limited range (±10%), but the system complexity and cost increase
Solution Approach 1:
The patent introduces a movable partition wall that can be repositioned within the fluid container to dynamically adjust the effective fluid length and thus the operating frequency. This dynamic adjustment mechanism allows frequency tuning without modifying the overall container geometry, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent changes the effective parameter (fluid column length) by moving the partition wall rather than changing the physical container dimensions. This parameter adjustment approach enables frequency tuning while maintaining the same container structure, thereby reducing system complexity and cost.
2Adaptability or versatility
If the container size is increased to accommodate larger fluid volumes for frequency adjustment, then the frequency can be tuned, but the installation footprint increases
Solution Approach 1:
The movable partition wall enables dynamic adjustment of the effective fluid volume within a fixed container size. This allows the system to achieve multiple frequency settings without increasing the physical container dimensions, thus maintaining a compact installation footprint while providing frequency adaptability.
Solution Approach 2:
The partition wall acts as a nested element within the container that can be repositioned to effectively change the fluid column length. This nested structure allows frequency tuning functionality to be integrated within the existing container boundaries without requiring additional space.
3Adaptability or versatility
If the liquid column length is increased to change the operating frequency in TLCD, then the frequency can be adjusted, but the parasitic vertical-column portions reduce the available fluid reaction mass
Solution Approach 1:
The patent segments the fluid container into multiple sections using a movable partition wall, allowing independent control of the effective fluid column length. This segmentation enables frequency adjustment by changing the active fluid length without requiring additional parasitic vertical columns, thus preserving the fluid reaction mass for vibration mitigation.
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 adaptable vibration damping across a wide range of frequencies and vibration modes with reduced complexity and cost, suitable for diverse structural applications by allowing frequency adjustments without structural changes.
Implementation Method 1
a first container having rigid wall regions and compliant wall regions
Implementation Method 2
A gas fills the second container
Implementation Method 3
A flow restrictor is included in the second container and is spaced-apart from the one of the compliant wall regions included with the second container
Implementation Method 4
fluid-filled frequency-tunable vibration damper for coupling to structures subject to vibration motion that needs to be damped
Data Source
AI summary
A frequency-tunable vibration damper includes a first container having rigid wall regions and compliant wall regions. A second container is coupled to the first container such that a wall region of the second container includes one of the compliant wall regions. A fluid fills the first container and a gas fills the second container. A flow restrictor is included in the second container and is spaced-apart from the one of the compliant wall regions included with the second container.