Ultrasound Communication for Structural Health Monitoring
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Solution Overview
Problem
Current wireless sensor network solutions for structural health monitoring in aircraft and other structures, such as composite materials, face challenges including detectability by enemies, high power requirements, and interference issues with RF communication, which can lead to increased costs and risks of catastrophic failures due to material defects.
Innovation Solution
A real-time sensor network utilizing ultrasound communication for data transmission within the structure itself, employing ultrasound transducers to transmit modulated signals through Lamb waves, which are virtually undetectable externally and reduce interference, allowing for embedded sensors without the need for wiring or high-power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RF wireless communication is used for sensor networks, then wireless data transmission is achieved, but power consumption increases and detectability by enemies increases
Solution Approach 1:
The patent replaces RF electromagnetic communication with ultrasound acoustic communication. Ultrasound transducers convert electrical signals to mechanical vibrations that travel through the structure, eliminating the need for high-power RF transmitters and reducing detectability while maintaining wireless data transmission capability.
Solution Approach 2:
The patent utilizes mechanical vibrations in the form of ultrasound waves to transmit data through the structure. The ultrasound transducers generate high-frequency mechanical vibrations that propagate along the structure, enabling wireless communication with lower power consumption and reduced detectability compared to RF methods.
2Ease of operation
If RF communication is used for sensor networks, then wireless data transmission is achieved, but interference and multipath problems increase
Solution Approach 1:
The patent substitutes RF electromagnetic waves with ultrasound mechanical waves for communication. Ultrasound waves traveling through the structure experience less interference and multipath effects compared to RF waves, as the mechanical vibrations are guided along the structure rather than propagating freely through space.
Solution Approach 2:
The patent uses the structure itself as an intermediary medium for communication. Ultrasound waves travel through the structure material, which acts as a waveguide, reducing the impact of external interference and multipath effects that plague RF communication systems.
3Reliability
If wired sensor networks are used, then reliable data transmission is achieved, but installation costs and complexity increase
Solution Approach 1:
The patent replaces wired electrical connections with wireless ultrasound communication. The ultrasound transducers transmit data through mechanical vibrations along the structure, eliminating the need for physical wiring while maintaining reliable data transmission, thereby reducing installation complexity and costs.
Solution Approach 2:
The patent enables the structure to serve as both the monitored object and the communication medium. The structure itself conducts the ultrasound waves, utilizing its existing material properties for data transmission without requiring additional wiring or complex installation infrastructure.
4Length of stationary object
If high-power RF sources are used for sensor networks, then communication range is extended, but battery requirements and weight increase
Solution Approach 1:
The patent replaces high-power RF transmission with low-power ultrasound transmission through the structure. Ultrasound waves are efficiently conducted through the structure material, extending communication range without requiring high-power batteries, thereby reducing weight while maintaining extended reach.
Solution Approach 2:
The patent uses mechanical vibrations to transmit data over extended distances through the structure. The ultrasound transducers generate vibrations that propagate efficiently along the structure, achieving long communication range with minimal power consumption and no heavy battery requirements.
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
This approach reduces installation costs, minimizes detectability risks, and effectively monitors structural health by providing real-time measurements, enhancing safety margins and reducing the likelihood of sudden failures while maintaining low power consumption and reducing interference.
Implementation Method 1
employing ultrasound transducers to transmit modulated signals through Lamb waves
Implementation Method 2
A real-time sensor network utilizing ultrasound communication for data transmission within the structure itself
Implementation Method 3
ultrasound transducers can be attached to metal or composite structures
Data Source
AI summary
Embodiments of the present invention beneficially provide an ultrasound communication system and methods of ultrasound communication for diagnostics and prognostics of structures. For example, ultrasound transmitters are connected to a metal or composite structure and modulated to produce Lamb waves that travel to an ultrasound receiver. The ultrasound transmitters can use frequency-hopped signals to digitally encode transducer information among different transmitters. The transmitters can be operated asynchronously. The receiver can use a channel equalizer to reduce the effects of signal multipath and a decoder to decode the transducer information from the ultrasound transmitters.