Water Surface Sensing for Low-Altitude Vehicle Stability Control
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Solution Overview
Problem
Vehicles operating at low altitudes over water surfaces, such as wing-in-ground effect vehicles, face challenges in controlling altitude, speed, and heading due to Doppler-shifted wave frequencies, leading to instability and reduced maneuverability and efficiency.
Innovation Solution
The use of sensor systems, including adjustable focal length image sensors, time-of-flight sensors, and wing deflection sensors, to measure water surface characteristics and control vehicle operation, combined with a distributed propulsion system and hydrofoil assemblies for stable and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vehicles operate at low altitudes over water surfaces, then maneuverability and efficiency are improved, but instability occurs due to Doppler-shifted wave frequencies
Solution Approach 1:
The control system preemptively adjusts vehicle operating parameters (altitude, speed, heading) based on predicted wave conditions and Doppler-shifted frequencies, preventing instability before it occurs rather than reacting after disruption
Solution Approach 2:
The vehicle employs dynamic adjustment of operational parameters in real-time based on sensor feedback from water surface conditions, allowing the system to adapt continuously to changing wave frequencies and maintain stability while operating at low altitudes
2Measurement precision
If sensor systems are used to measure water surface characteristics, then control precision is improved, but device complexity increases
Solution Approach 1:
The sensor system is designed to perform multiple functions: measuring wave height, wavelength, frequency, and water surface characteristics simultaneously, reducing the need for separate specialized sensors and thereby limiting complexity increase
Solution Approach 2:
Optical sensors and image processing systems serve as intermediaries to non-invasively measure water surface characteristics from a distance, avoiding direct contact with waves and enabling precise measurement without requiring complex physical sensor arrays on the vehicle
3Stability of the object's composition
If vehicle parameters are adjusted to counteract Doppler-shifted wave frequencies, then stability is improved, but response time increases
Solution Approach 1:
The control system continuously receives feedback from sensors measuring actual wave conditions and vehicle response, adjusting parameters in a closed-loop manner to achieve rapid stabilization without excessive response time
Solution Approach 2:
Electronic control systems and algorithms replace slower mechanical adjustment mechanisms, enabling rapid computation and actuation of parameter changes to counteract wave frequencies with minimal delay
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
Enhances the stability and maneuverability of vehicles over water surfaces by accurately measuring wave frequencies and adjusting vehicle parameters, reducing drag and cavitation, and enabling efficient transition between hull-borne, hydrofoil-borne, and wing-borne modes.
Implementation Method 1
time-of-flight sensors, to measure water surface characteristics
Implementation Method 2
adjustable focal length image sensors, to measure water surface characteristics
Data Source
AI summary
An example computing system is configured to: (i) receive, from one or more sensors of a vehicle in motion over a body of water, a set of sensor data, (ii) based on the set of sensor data, determine (a) an instantaneous distance between the vehicle and a surface of the body of water and (b) an instantaneous slope of the surface of the body of water, (iii) based on at least one of the instantaneous distance or the instantaneous slope, determine a statistical representation of the surface of the body of water, and (iv) based on the determined statistical representation of the surface of the body of water, adjust one or more control surfaces of the vehicle to change one or more of a speed, altitude, heading, or attitude of the vehicle.