Buoyancy Modification Module for Modular Underwater Vehicles
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Solution Overview
Problem
Modular underwater vehicles face challenges in dynamically adjusting buoyancy due to the pick-up or drop-off of objects, which affects their mass and stability, requiring a solution to maintain optimal buoyancy and minimize exposure to corrosive and pressurized conditions.
Innovation Solution
A buoyancy modification module with a frame designed for easy connection, featuring a pressure hull with a flooding region and a pump to manage water and gas pressure, allowing for neutral buoyancy and efficient gas compression to reduce volume and energy consumption, while keeping the pump dry and protected from corrosive conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pump is placed directly in the flooding region to manage water pressure, then buoyancy adjustment capability is improved, but exposure to corrosive and pressurized conditions increases
Solution Approach 1:
The pressure hull is divided into two distinct regions: a flooding region that exposes only minimal components to water pressure and corrosion, and a dry region that houses the pump and electronics. This segmentation allows the pump to function in buoyancy adjustment while being protected from harmful environmental factors.
Solution Approach 2:
A transfer mechanism (such as a valve system or conduit) acts as an intermediary between the flooding region and the dry region, enabling the pump to control water flow for buoyancy adjustment without being directly exposed to the corrosive environment. The intermediary protects the pump while maintaining functional connectivity.
2Adaptability or versatility
If the flooding region volume is increased to improve buoyancy adjustment range, then buoyancy adaptability is improved, but energy consumption for pumping increases
Solution Approach 1:
The system dynamically adjusts the flooding region volume based on mission requirements and current buoyancy needs. Rather than maintaining a constantly large flooding region, the volume is optimized in real-time, pumping water in or out as needed. This dynamic approach maintains full adaptability while minimizing the energy required for pumping operations.
Solution Approach 2:
The buoyancy control system changes physical parameters (water volume in flooding region, pressure differential) to achieve desired buoyancy adjustment range. By controlling the degree of flooding rather than always maintaining maximum volume, the system achieves full adaptability with reduced energy consumption during normal operation.
3Reliability
If the pressure hull is made more robust to withstand higher pressure, then reliability under pressure is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The pressure hull is segmented into a flooding region that directly withstands external water pressure and a dry region that requires minimal pressure resistance. This segmentation allows the critical pressure-withstanding components to be simplified while maintaining overall reliability, as only the flooding region shell needs to be highly robust.
Solution Approach 2:
Different regions of the pressure hull have different structural requirements. The flooding region is designed with high pressure resistance and corrosion resistance properties, while the dry region can use simpler, lighter materials. This local differentiation of quality requirements reduces overall device complexity while maintaining reliability where it is most needed.
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 flexible and efficient buoyancy adjustment, reducing energy consumption and minimizing exposure to corrosive environments, thus maintaining stability and extending the lifespan of the underwater vehicle.
Implementation Method 1
a first pump configured to pump water from surroundings or from a neutral-buoyancy reservoir into the first flooding region and configured to pump water out of the first flooding region into the surroundings or the neutral-buoyancy reservoir
Implementation Method 2
efficient gas compression to reduce volume and energy consumption
Data Source
AI summary
A buoyancy modification module for a modular underwater vehicle may include a first frame configured to connect the buoyancy modification module to other modules, and a first pressure hull with a first flooding region and a first dry region. A first pump arranged in the first dry region can pump water out of the surroundings or a neutral-buoyancy reservoir into the first flooding region and out of the first flooding region into the surroundings or the neutral-buoyancy reservoir. A first gas region that is connected to the first flooding region may include a first gas pressure when the first flooding region is completely empty, and a second gas pressure when the first flooding region is completely flooded. A difference between the first gas pressure and the second gas pressure results from a reduction in space available for gas in the first gas region.