Acoustic Sensor Nodes for Wireless Structural Monitoring
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Solution Overview
Problem
Existing acoustic sensing networks face challenges in scalability and efficiency due to the need for wired connections and the inapplicability of wireless communications in complex, electrically conductive, or optically opaque structures, particularly in structural health monitoring and biological applications.
Innovation Solution
The development of acoustically coupled wireless sensor nodes that use piezoelectric transducers and adaptive communication circuits to transmit and receive acoustic signals through a medium, enabling wireless power and data transfer, and employing machine learning algorithms for feature extraction and classification to optimize communication parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired connections are used for sensor networks, then communication reliability is improved, but device complexity and scalability deteriorate due to exponentially-increasing routing/weight/size
Solution Approach 1:
The patent replaces mechanical wired connections with acoustic wave-based wireless communication. Transducers convert electrical signals to acoustic signals that propagate through the medium (water, tissue, or structure), eliminating the need for physical wiring while maintaining communication reliability in environments where RF and IR fail.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium for communication. Instead of direct electrical connections or electromagnetic radiation, information is transmitted by modulating acoustic waves that travel through the physical medium, enabling wireless communication in conductive or opaque environments.
2Device complexity
If wireless RF or IR communication is used, then device complexity is reduced by eliminating wired interfaces, but applicability deteriorates in electrically conductive or optically opaque structures
Solution Approach 1:
The patent substitutes electromagnetic (RF/IR) communication with mechanical acoustic wave communication. Acoustic waves propagate through the physical medium rather than through air or vacuum, enabling penetration of electrically conductive and optically opaque materials that block traditional wireless signals.
Solution Approach 2:
The patent changes the fundamental communication parameter from electromagnetic frequency to acoustic frequency. This parameter change allows the system to operate in media where electromagnetic waves are attenuated or blocked, such as biological tissues and metallic structures, while maintaining wireless operation.
3Adaptability or versatility
If acoustic signals are used for communication, then adaptability to complex structures is improved, but energy efficiency deteriorates due to power requirements for transducer operation
Solution Approach 1:
The patent employs periodic acoustic signaling with duty cycling, where transducers transmit in intermittent bursts rather than continuously. This periodic operation reduces average power consumption while maintaining communication functionality, allowing sensor nodes to operate with limited energy resources.
Solution Approach 2:
The patent implements dynamic power management where transducer operation is adjusted based on communication needs, signal quality, and energy availability. The system dynamically switches between transmission and reception modes, and adjusts transmit power levels to optimize energy efficiency while maintaining adaptability to the medium.
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 solution allows for cost-effective, reliable monitoring of complex structures and biological tissues by improving communication efficiency, power management, and hardware longevity, while enabling flexible and scalable sensor networks.
Implementation Method 1
Each of the nodes includes a transducer, a communication circuit, and a controller. The transducer is adapted to be coupled to a medium.
Implementation Method 2
The communication circuit is coupled to the transducer to send and receive acoustic signals via the medium
Data Source
AI summary
In an example, a system includes a plurality of acoustically coupled nodes. Each of the nodes includes a transducer, a communication circuit and a controller. The transducer is adapted to be mechanically coupled to a medium. The communication circuit is coupled to the transducer to send and receive acoustic signals via the medium according to at least one communication parameter. The controller is to adaptively configure the at least one communication parameter of the communication circuit based on an acoustic signal received from at least one other of the nodes.