Guided Wave Sensor Coupling via Heated Polymeric Bonding
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Solution Overview
Problem
Existing methods for long-term monitoring of structural components using guided waves face challenges in maintaining consistent coupling between guided wave sensors and structural components, particularly due to thermal cycling and environmental conditions, leading to decoupling and reduced measurement accuracy.
Innovation Solution
A system comprising an electromechanical device with a measurement surface and a polymeric bonding agent, which can be heated to flow and re-solidify, ensuring consistent contact with the structural component, along with a clamp to apply minimal pressure and maintain coupling, addresses the issue of decoupling caused by thermal changes and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If continuous pressure is applied between the probe and structural component using dry coupling, then initial contact is achieved, but coupling consistency deteriorates under thermal cycling and vibration
Solution Approach 1:
The patent changes the physical state of the bonding agent from solid to liquid by heating, allowing it to flow and fill gaps between the probe and structural component. This parameter change enables the coupling to maintain consistency under thermal cycling and vibration without requiring continuous pressure adjustment.
Solution Approach 2:
The patent uses a composite coupling system combining a polymeric bonding agent with the probe and structural component. This composite material approach allows the bonding agent to provide both mechanical bonding and damping properties, improving coupling reliability under varying conditions.
2Strength
If polymer systems such as epoxy or polyurethane are used as couplants, then bonding is achieved, but coupling is lost due to thermal cycling and vibration
Solution Approach 1:
The patent employs a bonding agent that transitions from liquid to solid state dynamically. The agent starts as a liquid for application, then solidifies to provide bonding, and can be re-melted for maintenance. This dynamic state change allows the system to adapt to thermal cycling and vibration without losing coupling.
Solution Approach 2:
The patent utilizes phase transitions of the polymeric bonding agent between liquid and solid states. Heating causes the agent to melt and flow for application or re-coupling, while cooling allows it to solidify and maintain the bond. This phase transition mechanism enables reliable coupling maintenance under environmental variations.
3Measurement precision
If shear wave coupling gel is used, then initial coupling is achieved, but viscosity changes over time and with temperature reduce effectiveness
Solution Approach 1:
The patent controls the temperature parameter to maintain the bonding agent in an optimal state. By heating the agent during application and maintenance, the system ensures consistent viscosity and coupling effectiveness, preventing the degradation that occurs with natural aging and temperature variations.
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 effectively re-establishes and maintains coupling between the guided wave probe and the structural component, improving measurement accuracy by reducing disparities and voids, and allowing for continuous, efficient guided wave inspection without pressure dependency.
Implementation Method 1
heating the bonding agent with a heating element such that the bonding agent begins to flow
Implementation Method 2
heating the bonding agent with a heating element such that the bonding agent begins to flow
Data Source
AI summary
The present disclosure relates to a system for monitoring a structural component. The system may include an electromechanical device to generate guided waves having a measurement surface and a bonding agent disposed on the measurement surface and configured to engage with the surface of the structural component. The system may also include a heating element for heating the measurement surface, the bonding agent, and capable of heating a portion of the structural component surface. In addition, the system may include a clamp for retaining the measurement surface relative to the structural component.