Airborne EM Receiver Suspension Coil Assembly Vibration Isolation
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Solution Overview
Problem
Airborne electromagnetic (EM) survey systems face challenges in improving signal-to-noise ratio and depth of exploration due to noise introduced by vibrations and complex receiver coil assemblies, which are cumbersome and ineffective in reducing torsional and rotational vibrations.
Innovation Solution
A large dimension receiver coil assembly with a simple and flexible vibration reduction mechanism, utilizing a suspension assembly based on a modified Roberts linkage structure to isolate the receiver coil from erratic vibrations, allowing a lower transmitter base frequency and enhancing signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between transmitter and receiver is increased to reduce system noise and improve SNR, then signal-to-noise ratio is improved, but system size and complexity increase
Solution Approach 1:
The receiver system is segmented into multiple independent suspension coils (three orthogonal pairs) that can be independently suspended and adjusted. This segmentation allows each coil to be optimized for specific measurement directions while maintaining overall system compactness, resolving the contradiction between improving measurement precision through noise reduction and avoiding system complexity increase.
Solution Approach 2:
The suspension coils are nested within a compact receiver assembly that integrates multiple functional components. The three orthogonal coil pairs are arranged in a space-efficient configuration where coils are positioned along different axes within a confined volume, enabling improved SNR through proper coil spacing without proportionally increasing overall system size.
2Measurement precision
If a double suspension receiver coil apparatus is used to reduce vibrations, then noise reduction is achieved, but manufacturing and assembly become cumbersome
Solution Approach 1:
The suspension system is segmented into three independent orthogonal pairs of coils, each with its own suspension mechanism. This segmentation allows for modular manufacturing where each coil assembly can be produced and tested separately, then integrated into the complete receiver system, significantly simplifying both manufacturing and assembly processes compared to a monolithic double suspension design.
Solution Approach 2:
The suspension mechanism designed for one coil pair is made universal and replicated for all three orthogonal pairs. The same suspension principles and components are applied consistently across all coils, enabling standardized manufacturing processes and simplified assembly procedures while achieving comprehensive vibration reduction in all spatial directions.
3Length of stationary object
If the receiver coil assembly is made large in dimension to allow low transmitter base frequency, then depth of exploration increases, but unwanted motion and vibration increase
Solution Approach 1:
The system intentionally utilizes controlled mechanical vibration through the suspension mechanism to counteract unwanted motions. The suspension coils are designed with specific natural frequencies that allow them to respond to and dampen turbulent forces and vibrations acting on the receiver assembly, converting harmful random vibrations into controlled oscillatory motion that can be filtered and compensated.
Solution Approach 2:
The suspension mechanism acts as an intermediary element between the large receiver coil assembly and the external environment. This intermediary suspension system isolates the coils from direct mechanical coupling with turbulent forces while allowing controlled motion, thereby reducing the transmission of unwanted vibrations to the sensitive receiver elements while maintaining the large dimension needed for deep exploration.
4Measurement precision
If a complex receiver coil assembly is used to improve signal reception, then measurement precision is improved, but the system becomes difficult to adapt to different configurations
Solution Approach 1:
The receiver system is divided into three independent orthogonal coil pairs that can be independently configured and adjusted. Each pair is suspended separately and can be positioned along its respective axis without affecting the others, allowing flexible adaptation to different measurement requirements and geological conditions while maintaining high measurement precision through optimized signal reception in each direction.
Solution Approach 2:
The receiver coil assembly incorporates dynamic suspension mechanisms that allow the coils to move and adjust their positions in response to varying operational conditions. The suspension system enables controlled motion and reconfiguration of the coils along their respective axes, providing adaptability to different survey configurations while maintaining optimal signal reception characteristics through dynamic positioning.
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 increases the depth of exploration, improves signal-to-noise ratios, and allows for larger dipole moments and better conductor discrimination by stabilizing the receiver coil assembly and reducing unwanted motion, resulting in a more effective airborne EM system.
Implementation Method 1
a suspension assembly to stabilize or suspend the receiver coil assembly, thereby reducing unwanted motion or vibration of the receiver coil assembly
Implementation Method 2
A transmitter of the EM system generates a primary electromagnetic field that induces eddy currents in the earth. These eddy currents generate a secondary electromagnetic field or ground response. A receiver of the EM system then measures the response of the ground.
Data Source
AI summary
The present invention provides an airborne electromagnetic receiver having a large dimension to allow low transmitter base frequency. A modular and configurable suspension assembly is provided for use within a receiver support structure and suspending the support structure. The suspension assembly has a rigid support having a suspension portion, and links connecting the suspension portion and the suspended structure. The links are adjustable in length and tension to radially suspend said equipment support structure. The natural frequency of the suspension assembly and the suspended receiver motion can be optimized by adjusting mass distribution, suspension link length and suspension link tension. The suspension assembly can be used to suspend a receiver having large receiver coils. The suspension assembly converts high frequency vibration forces imparted on the receiver to a low frequency oscillation. The suspension assembly may also be tuned to avoid coincidence with the excitation frequencies.