Rigid Receiver Coil Frame for Aerodynamic Stabilization
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Solution Overview
Problem
Existing geophysical surveying methods using fixed-wing aircraft require an efficient and aerodynamically stable tow assembly for airborne electromagnetic (EM) surveys, particularly for passive methods like AFMAG, which face challenges in maintaining orientation and reducing noise interference during flight.
Innovation Solution
A substantially rigid receiver coil frame with a central open area and a tow cable system that provides aerodynamic stabilization, allowing the receiver coil to maintain a consistent pitch and yaw orientation, and is designed to minimize airflow resistance and vibration, with elastic suspension systems to secure the coil and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional tow assembly is used for airborne geophysical surveys, then the receiver coil can be suspended from the aircraft, but the assembly lacks aerodynamic stabilization causing poor pitch and yaw orientation maintenance
Solution Approach 1:
The tow assembly is divided into distinct functional segments: a rigid receiver coil frame for structural support, elastic suspension elements for vibration isolation, and aerodynamic stabilization components (vertical and horizontal stabilizers) for orientation control. Each segment performs a specific function, allowing the system to achieve stable orientation without excessive overall complexity.
Solution Approach 2:
Aerodynamic counterforces are generated by vertical and horizontal stabilizers that counteract gravitational and aerodynamic disturbances acting on the receiver coil assembly. The stabilizers create opposing forces to maintain desired pitch and yaw orientations during flight, effectively compensating for destabilizing forces.
2Strength
If the receiver coil frame is made rigid for structural support, then the coil is protected, but airflow resistance and vibration increase
Solution Approach 1:
Elastic suspension elements (flexible components) are used to connect the receiver coil frame to the aircraft tow point. These flexible elements isolate the rigid frame from vibration and reduce airflow resistance compared to rigid connections, while still providing necessary structural support and orientation stability through the frame's rigid members.
3Object-affected harmful factors
If elastic suspension systems are used to secure the coil, then vibration and noise are reduced, but the complexity of the suspension system increases
Solution Approach 1:
The elastic suspension elements are extracted as separate, dedicated components between the rigid receiver coil frame and the aircraft tow point. This extraction allows the suspension system to be optimized independently for vibration isolation, while the rigid frame maintains its structural integrity and aerodynamic stabilization functions through separate stabilizer components.
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 enables efficient data collection by maintaining the receiver coil's orientation and reducing noise interference, thereby improving the signal-to-noise ratio and enhancing the accuracy of geophysical surveys.
Implementation Method 1
a receiver coil housed within the internal passageway isolated from the central open area; the receiver coil being configured to measure the response of surveyed terrain to naturally occurring EM events
Implementation Method 2
the receiver coil frame being formed from rigid members configured to provide aerodynamic stabilization to maintain the receiver coil frame in a desired pitch and yaw orientation relative to a direction of travel and the horizontal when the receiver coil frame is suspended during flight
Implementation Method 3
with elastic suspension systems to secure the coil and reduce noise
Data Source
AI summary
A airborne geophysical electromagnetic (EM) survey tow assembly system for use with an aircraft, including a substantially rigid receiver coil frame that defines a central open area, the receiver coil frame forming a continuous internal passageway that extends around the central open area; a receiver coil housed within the internal passageway isolated from the central open area, the receiver coil being configured to measure the response of surveyed terrain to naturally occurring EM events; and a tow cable for suspending the receiver coil frame from the aircraft, the receiver coil frame being formed from rigid members configured to provide aerodynamic stabilization to maintain the receiver coil frame in a desired pitch and yaw orientation relative to a direction of travel and the horizontal when the receiver coil frame is suspended during flight.