Wireless Sensor Wafers for Composite Structural Health Monitoring
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Solution Overview
Problem
Current structural health monitoring systems for aircraft composite parts face challenges such as damage susceptibility, manufacturing delays, power consumption issues, and signal interference due to embedded sensors and wired connections, which hinder effective and efficient detection of structural damage.
Innovation Solution
A wireless, self-contained structural health monitoring system with a central data acquisition module and sensor wafers that communicate hierarchically, allowing for reconfiguration in case of sensor failure, and are bonded to the composite surface using a composite curing process, with power sources and isolation layers to minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are embedded within composite laminate, then damage susceptibility is reduced, but resin buildup occurs causing cracking initiation
Solution Approach 1:
The sensor is segmented into a modular wafer design with separate functional layers (sensor element, circuitry, battery, antenna) bonded to the composite surface. This segmentation allows the sensor to be installed without creating pockets in the laminate, eliminating resin buildup issues while maintaining embedded-like protection.
Solution Approach 2:
The sensor transitions from a traditional embedded 3D configuration to a surface-bonded wafer with thin profile. By reducing the sensor's dimension in the thickness direction and bonding it to the surface, the system achieves protection without interfering with composite curing and avoids cracking initiation.
2Reliability
If sensors are embedded and connected to central bus, then monitoring capability is improved, but manufacturing process slows down
Solution Approach 1:
The system replaces wired mechanical connections with wireless communication. Sensor wafers transmit data wirelessly to the central data acquisition module, eliminating the need to halt fiber placement for wiring connections and significantly speeding up the manufacturing process.
Solution Approach 2:
The sensor wafer is designed as a self-contained unit with integrated sensor element, circuitry, battery, and wireless antenna. This multi-functional integration allows the sensor to be installed independently during composite manufacturing without requiring separate wiring operations.
3Device complexity
If wireless sensors are used, then power consumption increases, but wire routing complexity is reduced
Solution Approach 1:
The wireless sensor wafer uses periodic transmission instead of continuous communication, activating the transmitter only when data needs to be sent to the central module. This periodic operation significantly reduces power consumption compared to continuous wired signal transmission.
Solution Approach 2:
The system optimizes wireless transmission parameters including power output, transmission frequency, and data packet size to minimize energy consumption while maintaining reliable communication, allowing the use of small batteries in the sensor wafer.
4Area of stationary object
If sensors are located at farther distances, then coverage area is increased, but signal interference increases and power consumption increases
Solution Approach 1:
The hierarchical communication structure dynamically routes data through intermediate sensor wafers rather than requiring direct long-range communication with the central module. This dynamic relaying extends coverage area while maintaining signal quality by breaking long transmissions into shorter segments.
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 system enables efficient monitoring of structural health by reducing manufacturing delays, minimizing damage risk, and optimizing power usage, while maintaining the structural integrity of the composite part and allowing for easy maintenance and replacement of sensors.
Implementation Method 1
One known type of SHM system includes several independent piezoelectric sensors, glued or otherwise affixed to an aircraft structure
Implementation Method 2
Another type of SHM system uses wireless sensors to communicate with the data acquisition box
Implementation Method 3
sensor wafers bonded to a bondable surface of the structure
Data Source
AI summary
A system and method for structural health monitoring (SHM) of a physical structure, such as an aircraft component. The system may comprise a central data acquisition module and a plurality of wireless, self-contained sensor wafers bonded to a surface of the physical structure. The central data acquisition module and the sensor wafers may be communicably coupled in a hierarchical order. If any of the sensor wafers detects a structural fault, it may be stored in a memory of the central data acquisition module for retrieval by maintenance personnel. If one or more of the sensor wafers malfunctions, the central data acquisition module may reconfigure the hierarchical order in which the sensor wafers communicate to exclude the malfunctioning sensor wafer or wafers. The sensor wafers may include a sensor, circuitry, a wireless antenna, and a power source.