Variable Volume Fluid Container with Electromagnetic Sensing
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Solution Overview
Problem
Current fluid storage systems for spaceflight applications face challenges such as fluid separation in low-gravity environments, mechanical stress due to wrinkles, contamination risks from materials, and inaccurate volume measurement in non-terrestrial conditions.
Innovation Solution
A fluid storage system comprising a container with a variable internal volume, limited by two shell components that allow smooth expansion and contraction, and an electrical volume sensing mechanism using loops to accurately measure fluid volume changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid containers are used to store liquid, then structural strength is improved, but fluid retention in low-gravity environments deteriorates
Solution Approach 1:
The patent employs a flexible bladder made from chemically stable materials such as fluoropolymers to contain the fluid. This flexible membrane adapts to low-gravity environments by maintaining fluid contact through its compliance, unlike rigid containers where fluid may detach or form free-floating blobs. The flexible shell conforms to the fluid's shape while providing containment, ensuring reliable fluid retention in microgravity conditions.
2Volume of stationary object
If bladders are welded from flat sheet in nominal-full geometry, then volume efficiency is improved, but mechanical stress concentrations worsen
Solution Approach 1:
The patent utilizes a spherical or near-spherical bladder geometry rather than flat-sheet constructions. This curved, three-dimensional shape distributes mechanical stresses uniformly across the membrane surface, eliminating stress concentrations that would occur at weld lines or sharp corners in flat-sheet designs. The spherical form factor maximizes volume while minimizing stress, improving both volume efficiency and mechanical strength simultaneously.
3Ease of manufacture
If bladder membranes are made from plastics or elastomers, then ease of manufacture is improved, but chemical stability deteriorates
Solution Approach 1:
The patent specifies the use of fluoropolymer materials such as PTFE (polytetrafluoroethylene) or FEP (fluorinated ethylene propylene) for the bladder construction. These materials combine the manufacturing advantages of plastics with superior chemical stability and inertness. Fluoropolymers resist degradation from biocides, cleaning solvents, and chemical reagents while preventing leaching of plasticizers into the stored fluid, thus eliminating chemical contamination risks.
4Strength
If spherical or cylindrical bladder shapes are used, then pressure resistance is improved, but spatial efficiency deteriorates
Solution Approach 1:
The patent employs a flexible, collapsible bladder that dynamically changes shape and volume as fluid is added or removed. Unlike rigid spherical tanks that maintain fixed geometry, this flexible bladder can collapse inward as fluid is depleted, maintaining optimal pressure distribution while minimizing the occupied volume. This dynamic adaptation allows the system to achieve high pressure resistance when full while occupying minimal space when empty, resolving the contradiction between pressure resistance and spatial efficiency.
5Ease of operation
If traditional volume measurement methods are used, then measurement simplicity is improved, but measurement precision in low-gravity deteriorates
Solution Approach 1:
The patent replaces traditional mechanical volume measurement methods (such as level indicators or weight-based systems) with an optical or capacitive sensing system. The invention utilizes a sensor that detects fluid volume through electromagnetic or optical properties rather than mechanical displacement or gravitational effects. This substitution enables accurate volume measurement in low-gravity environments where mechanical and gravitational reference frames are unreliable, while maintaining operational simplicity through electronic readout.
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 ensures secure, efficient, and accurate fluid storage and measurement in low-gravity environments, minimizing mechanical stress and contamination risks while maintaining pressure resistance and efficient volume utilization.
Implementation Method 1
A first current traveling through one of the first loop and the second loop may induce a second current in the other of the first loop and the second loop. A magnitude of the second currently may vary based on changes in the internal volume of the container.
Data Source
AI summary
Systems and methods for storing fluid and sensing volume are described. In some embodiments, a system may include a container having an internal volume that is configured to change as fluid enters or exits the container, a first loop disposed on a first side of the container, and a second loop disposed on a second side of the container. A first current traveling through one of the first loop and the second loop may induce a second current in the other of the first loop and the second loop, and a magnitude of the second current may vary based on changes in the internal volume of the container.