University of Illinois Urbana-Champaign

Magneto-mechanical systems for ultra-low frequency data transmission: Dynamics, losses, and driving mechanisms

Jing, Jiheng

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https://hdl.handle.net/2142/127508

Description

Title
Magneto-mechanical systems for ultra-low frequency data transmission: Dynamics, losses, and driving mechanisms
Author(s)
Jing, Jiheng
Issue Date
2024-12-06
Director of Research (if dissertation) or Advisor (if thesis)
Bahl, Gaurav
Doctoral Committee Chair(s)
Bahl, Gaurav
Committee Member(s)
  • Tawfick, Sameh H.
  • Bernhard, Jennifer
  • King, William P.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Magnetic Field
  • Magnetic Moment
  • Coil Current
  • Eddy Current Loss
  • Electrical Domain
  • Magnetic Signal
  • Power Consumption
  • Resonance Frequency
  • Time-varying Magnetic Field
  • Ultra-low Frequency
  • AC Magnetic Field
  • Amplitude Modulation
  • Angular Displacement
  • Average Power Consumption
  • Axial Length
  • Coil Resistance
  • Compensation Capacitor
  • DC Magnetic Field
  • Dc Field
  • Dipole Antenna
  • Dipole Approximation
  • Dipole Model
  • Eddy Current
  • Efficient Optimization Method
  • Equations Of Motion
  • Experimental Prototype
  • Frequency Range
  • Induction Coil
  • Inertial Frame
  • Linear Dynamics
  • Linear Stiffness
  • Local Stiffness
  • Magnetic Dipole
  • Magnetic Field Generation
  • Magnetic Flux
  • Magnetic Interactions
  • Magnetic Rotor
  • Magnetic Strength
  • Mechanical Damping
  • Mechanical Resonance
  • Mode Shapes
  • Model Analysis
  • Moment Of Inertia
  • Mutual Interaction
  • Near-field Effects
  • Net Dipole
  • Nonlinear Regime
  • Operating Frequency
  • Optimization Method
  • Oscillation Amplitude
Abstract
Effective communication in underwater and underground environments is crucial for applications such as environmental monitoring, search and rescue operations, and navigation. Traditional radio frequency (RF) communication systems are ineffective in these settings due to significant signal attenuation in conductive media like seawater and soil. Alternative methods, such as acoustic and optical communications, have limitations, including limited range, data rate, and susceptibility to environmental factors. Ultra-low frequency (ULF) communication offers a promising solution due to its lower signal attenuation in conductive media. However, conventional ULF transmission methods require impractically large antennas and immense power, constrained by fundamental physical limits like Chu's limit. These challenges underscore the need for innovative approaches to achieve efficient ULF communication in RF-denied environments. This thesis introduces resonance-based oscillatory magneto-mechanical transmitters (MMTs) as an efficient and compact solution for ULF communication in conductive media. The working principles of MMTs are explored, detailing both single-rotor and multi-rotor designs and demonstrating how data can be encoded using amplitude modulation. A comprehensive dynamical model is developed to account for both linear and nonlinear behaviors, including near-field magnetic interactions, enhancing frequency prediction, and system performance. To address intrinsic loss mechanisms, particularly eddy current losses, a simplified analytical model is proposed for estimating these losses without relying on complex simulations, and it is validated through experimental comparisons. Two novel driving mechanisms are introduced to optimize efficiency across different oscillation amplitudes, including an efficiency optimization method for low amplitudes and an adaptive driving circuit for high amplitudes that maintains the desired motion at resonance. Additionally, two innovative suspension systems, wire bearings, and levitated wire bearings, are designed specifically for resonance-based oscillatory MMTs to minimize energy loss while providing the necessary mechanical support and oscillation amplitude. Finally, a zero-loss suspension system, which aims to entirely eliminate power loss in the suspension system, is proposed as a future development direction. Collectively, these contributions advance the practical implementation of MMTs, offering a promising solution for reliable ULF communication in challenging underwater and underground environments.
Graduation Semester
2024-12
Type of Resource
Thesis
Handle URL
https://hdl.handle.net/2142/127508
Copyright and License Information
This work is under a 2-year embargo until December 6, 2026.

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