Linear Motor Acoustic Emitter Assembly for Broadband Seismic Output
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Solution Overview
Problem
Existing acoustic sources for seismic prospecting face challenges in achieving well-defined and high-amplitude oscillations across a wide range of frequencies, with limited control over amplitude and frequency in hydraulic and linear motor-based systems, and complexity in electromagnetic coil drives leading to durability issues.
Innovation Solution
A drive assembly comprising a vibrating surface, a frame with linear motors, and flexible transmission elements made of carbon fiber, glass fiber, or spring steel, which provide controlled oscillating motion and multiple resonances within the 1-300 Hz frequency range, allowing for efficient acoustic wave generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic or linear motor principles are used to generate high amplitudes at low frequencies, then oscillation amplitude is improved, but control over amplitude combined with frequency is limited
Solution Approach 1:
The patent employs multiple linear motors that can be independently controlled to dynamically adjust the oscillation characteristics. The system transitions from static resonance dependence to dynamic control where multiple motors can be activated selectively to achieve different amplitude-frequency combinations, resolving the contradiction between maintaining high amplitude and achieving versatile control.
Solution Approach 2:
The drive assembly is segmented into multiple independent linear motors rather than using a single motor or hydraulic system. This segmentation allows each motor to contribute to specific frequency components, enabling independent control of amplitude and frequency parameters that were previously coupled in single-motor or hydraulic systems.
2Adaptability or versatility
If electromagnetic coil drives are used to achieve broadband signal generation, then frequency range is improved, but device complexity increases leading to durability issues
Solution Approach 1:
The patent replaces the complex electromagnetic coil drive system with a mechanically simpler linear motor system. Linear motors provide direct electromagnetic force without the need for rotating coils and magnets, eliminating mechanical wear components while maintaining broadband capability through multiple independently controlled motors.
Solution Approach 2:
The linear motor system provides multi-functionality by using the same motor type for both low-frequency high-amplitude generation and broadband signal generation. The system can selectively activate different motors or combine their outputs to achieve various signal types, replacing the need for specialized electromagnetic coil drives for different frequency ranges.
3Measurement precision
If a single resonance frequency is used in linear motor drives, then control at that frequency is improved, but broadband efficiency deteriorates
Solution Approach 1:
The patent merges multiple linear motors with different resonance characteristics into a single drive assembly. By combining the outputs of multiple motors, the system achieves both precise control at individual resonance frequencies and high efficiency across a broadband range, as each motor contributes to its optimal frequency while collectively covering the full spectrum.
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 a simple, flexible, and reliable drive assembly capable of emitting signals across a wide range of frequencies, improving efficiency and durability while maintaining control over amplitude and frequency, thus enhancing seismic data acquisition.
Implementation Method 1
The linear motor drive is used to apply a magnetic field to a rod consisting of permanent magnets
Implementation Method 2
flexible transmission elements which connect between fastening devices extending on both sides of the axis
Implementation Method 3
Sources employed for generating sound waves in water can for example be sonar sources, flextensional sources, or seismic transmitters or sources
Data Source
AI summary
An apparatus for generating acoustic waves in an aquatic environment through the use of linear motors mounted on a frame is disclosed herein. The linear motors can reciprocate at a first frequency which is transmitted through a transmission element and to a sound emitting surface. The structure of the apparatus can generate acoustic waves across a broad frequency to measure subterranean formations.