LVDT Level Sensing Device for Unmanned Aircraft
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Solution Overview
Problem
Current digital fluid level transducers for unmanned aircraft are too long and fragile, making them unsuitable for the size and weight constraints of these vehicles, and existing LVDTs designed for positional measurement are not optimized for fluid level sensing in compact spaces.
Innovation Solution
A compact level sensing device using a linear variable differential transformer (LVDT) encased in a float casing with a non-magnetic core rod assembly and flexible electrical leads, allowing for robust and accurate fluid level measurement within the constraints of an unmanned aircraft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional LVDT with translating core is used for positional measurement, then measurement capability is achieved, but the overall extended length becomes at least twice that which is to be measured
Solution Approach 1:
The patent reorients the LVDT core rod assembly from a horizontal translating configuration to a vertical suspended configuration. The core rod assembly hangs vertically from the float, allowing the LVDT to measure vertical fluid level changes without requiring horizontal translation space. This dimensional reorientation reduces the overall extended length from twice the measurement range to approximately the measurement range itself.
2Reliability
If digital fluid level transducers are designed to be rugged for withstanding launch, flight and landing loads, then reliability is improved, but additional equipment needs and increased complexity result
Solution Approach 1:
The patent combines the LVDT transducer, float mechanism, and digital conversion capability into a single integrated assembly. The float casing houses the LVDT transducer, while the core rod assembly connects the float to the transducer. This merging eliminates the need for separate external converters and senders, reducing overall system complexity while maintaining ruggedness for withstanding shock loads during launch, flight, and landing.
3Volume of moving object
If compact LVDT design is implemented to meet size constraints, then volume is reduced, but the transducer may become more fragile
Solution Approach 1:
The patent employs a float casing that houses the LVDT transducer, providing protective enclosure while maintaining a compact form factor. The casing acts as a flexible shell that protects the internal transducer components from damage while allowing the overall assembly to remain space-efficient. This protective enclosure enables the transducer to maintain robustness despite the reduced volume required for unmanned aircraft applications.
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 solution provides a rugged and lightweight digital fluid level sensing apparatus capable of withstanding shock loads and accurately measuring fluid levels in unmanned aircraft fuel tanks, addressing the size and weight limitations of existing technologies.
Implementation Method 1
an LVDT translates along a core rod assembly fixed to a float
Data Source
AI summary
A level sensing device is disclosed that provides a lightweight but robust design and incorporates the use of an LVDT to determine the level of a fluid in a container.