Tandem Balloon Altitude Control via Variable Ballast
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Solution Overview
Problem
Existing lighter-than-air (LTA) systems lack the ability to effectively control altitude and trajectory during flight, particularly at high altitudes, and fail to achieve rapid ascent and descent over large altitude ranges, which is necessary for advanced mission requirements such as station-keeping and constellation coverage.
Innovation Solution
A tandem balloon system comprising a zero-pressure balloon (ZPB) and a variable air super-pressure balloon (SPB) with multiple chambers, where the ZPB provides lift and the SPB offers a controlled variable ballast supply and emission of ambient air, enabled by a compressor and adjustable valve, allowing for precise altitude control and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single balloon system is used, then the structure is simple, but the ability to control altitude and trajectory is insufficient
Solution Approach 1:
The balloon system is divided into two independent balloons: a zero-pressure balloon (ZPB) for providing lift and a super-pressure balloon (SPB) for altitude control. This segmentation allows each balloon to be optimized for its specific function, enabling precise altitude and trajectory control while maintaining operational simplicity through functional specialization.
2Speed
If rapid ascent and descent are achieved, then mission flexibility is improved, but energy consumption increases
Solution Approach 1:
The system uses a compressor to pump ambient air into the super-pressure balloon for rapid descent and employs adjustable valves for controlled air release during ascent. This pneumatic approach enables rapid altitude changes by directly manipulating the ballast air volume, achieving high speed altitude transitions while managing energy consumption through efficient compressor operation and passive valve-based air release.
3Measurement precision
If a variable air ballast system is implemented, then altitude precision is improved, but device complexity increases
Solution Approach 1:
The super-pressure balloon incorporates a dynamic ballast control system with a compressor and adjustable valves that can vary the amount of ambient air in the balloon in real-time. This dynamic adjustment of ballast air volume allows precise control of the balloon's buoyancy and altitude, achieving high measurement precision for altitude control while the modular design keeps the added complexity manageable.
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 enables agile and efficient high-altitude flight with rapid ascent and descent capabilities, maintaining station-keeping envelopes and supporting advanced mission objectives with a scalable and lightweight platform.
Implementation Method 1
A zero-pressure balloon (ZPB) configured to receive therein a lighter-than-air gas to provide an upward lifting force to the balloon system
Implementation Method 2
A compressor configured to pump air into the SPB to provide a variable downward force to the balloon system
Implementation Method 3
An adjustable valve configured to release the pumped-in air from the SPB to decrease the downward force to the balloon system
Implementation Method 4
The ZPB provides lift for the system while the SPB provides a variable amount of ballast by pumping in or expelling out ambient air
Data Source
AI summary
Lighter-than-air (LTA) systems and methods. The LTA may include a super-pressure balloon (SPB). A plurality of tendons may extend around and bias the SPB to a pumpkin shape. The SPB may use a compressor to provide a variable amount of ballast air by pumping in or expelling out ambient air. A zero-pressure balloon (ZPB) may be attached with the SPB. The ZPB may provide lift for the system. The SPB may include lifting gas and ballast air to provide both lifting and descent functions. The LTA may include a payload.