Floating Active Baffles for Slosh Damping
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Solution Overview
Problem
Existing passive mechanisms for damping liquid slosh in containers, such as baffles and diaphragms, are limited in their effectiveness across a range of frequencies, are heavy, bulky, and inefficient in managing dynamic forces in large space vehicles and rocket propellant containers, leading to potential loss of control due to resonance.
Innovation Solution
The introduction of active baffles that float on the liquid surface and are manipulated by a magnetic field, creating a semi-rigid structural layer to constrain the free surface of the liquid, combining passive and active damping techniques to manage sloshing effectively across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive baffles are used to damp liquid slosh, then sloshing is reduced within a limited frequency range, but the device becomes heavy and bulky with poor weight to operation range ratio
Solution Approach 1:
The patent applies the dynamics principle by using floating baffles that can move and adapt their position based on liquid sloshing conditions. The baffles are designed to float on the liquid surface rather than being fixed, allowing them to dynamically respond to varying slosh frequencies and amplitudes. This dynamic behavior enables effective slosh damping across a broader frequency range while reducing the overall weight and complexity of the system compared to traditional fixed passive baffles.
2Strength
If wall-fixed baffles are used, then structural support is provided, but placement is limited by supporting structures on tank walls
Solution Approach 1:
The patent replaces the mechanical support system (wall-fixed mounting structures) with a buoyancy-based support mechanism. The floating baffles derive their support from the liquid they displace, eliminating the need for mechanical attachment to tank walls. This substitution provides unlimited placement flexibility while maintaining structural integrity through the buoyant force and the baffle's own structural design.
3Reliability
If passive PMDs are used, then slosh damping is achieved, but they take up space in the fuel tank and are relatively heavy
Solution Approach 1:
The patent employs thin, flexible baffle structures that float on the liquid surface. These thin-film-like baffles provide effective slosh damping while occupying minimal volume within the fuel tank. The flexibility of the baffle material allows it to conform to the liquid surface and adapt to varying slosh conditions without requiring bulky rigid structures, thereby maximizing the available fuel tank volume.
4Stability of the object's composition
If thrust vector correction is used to counteract sloshing, then spacecraft nutation is corrected, but high magnitudes of propellant sloshing forces overpower the corrections
Solution Approach 1:
The patent applies preliminary anti-action by using floating baffles to proactively dampen propellant sloshing forces before they can overpower the spacecraft's control systems. The baffles are positioned to intercept and dissipate slosh wave energy at the liquid surface, preventing the buildup of high-magnitude sloshing forces that would otherwise require excessive thrust vector corrections and potentially lead to loss of control.
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 active baffle system significantly reduces sloshing amplitude and frequency, providing efficient damping across all fill levels and orientations, enhancing the structural integrity of containers and maintaining control of spacecraft or vehicles by adapting the rigidity of the structural layer in response to changing magnetic fields.
Implementation Method 1
The body is provided with a volume of activation material sufficient to enable the body to be manipulated in the presence of a magnetic field
Implementation Method 2
a body configured to float upon a surface of the liquid
Data Source
AI summary
This disclosure provides a system for damping slosh of a liquid within a tank, a baffle for use in the system, and a method of damping slosh using the system. The system includes a plurality of baffles. Each baffle has a body configured to substantially float upon the liquid. Each baffle also has an activation material received along at least a portion of the body. The activation material is magnetically reactive provided in a quantity sufficient to enable the body to be manipulated in the presence of a magnetic field (M). The system further includes an actuator configured to provide the magnetic field (M).