Piezoelectric Particle Structural Material for Health Monitoring
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Solution Overview
Problem
Current nondestructive testing methods for polymer matrix composite structures, such as ultrasonic testing and vibrational resonance, are time-consuming, expensive, and limited in their ability to fully characterize complex structures due to directional limitations and the need for skilled technicians and expensive equipment, while piezoelectric wafer active sensors face issues with bonding, durability, and compatibility with curved surfaces.
Innovation Solution
Incorporating piezoelectric material particles into a continuous structural material, such as polymer or ceramic, with conductive pickups to receive signals indicative of stresses induced by acceleration, allowing for simultaneous evaluation of structural integrity and health monitoring without the need for external sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric wafer active sensors are bonded to the structure for structural health monitoring, then the sensors can detect structural changes over time, but the bond is prone to break down over time and the sensors do not easily conform to curved surfaces
Solution Approach 1:
The patent combines the structural material and sensing material into a single integrated component. The sensing material (piezoelectric or piezoresistive particles) is dispersed within the structural material matrix, creating a unified structure that eliminates the need for separate sensors and bonding agents. This integration ensures the sensing element moves perfectly with the structural surface regardless of curvature, while the bond strength equals the structural material itself.
Solution Approach 2:
The patent uses composite materials by dispersing piezoelectric or piezoresistive particles within a structural material matrix. This composite approach allows the structural material to maintain its mechanical properties while the embedded particles provide sensing capabilities. The composite structure naturally conforms to any surface geometry and eliminates bonding issues since the sensing particles are embedded within the material itself.
2Measurement precision
If ultrasonic testing is performed to evaluate structural integrity, then defects can be detected, but the process is time-consuming and requires skilled technicians and expensive equipment
Solution Approach 1:
The patent enables the structural material to perform its own health monitoring through embedded sensing particles. The structure generates its own sensing data through the piezoelectric or piezoresistive particles that respond to stress and strain, eliminating the need for external testing equipment and skilled technicians. The structure essentially monitors itself continuously without requiring separate inspection operations.
Solution Approach 2:
The patent replaces complex external ultrasonic testing equipment with simple conductive pickups that read electrical signals from embedded particles. Instead of using mechanical ultrasonic transducers requiring skilled operation, the system uses electrical field interactions with piezoelectric or piezoresistive particles, simplifying the measurement system and enabling automated, rapid assessment.
3Reliability
If piezoelectric wafer active sensors are used on aerodynamic surfaces, then structural health monitoring is achieved, but the sensors produce unacceptable irregularities on aerodynamic surfaces
Solution Approach 1:
The patent merges the sensing function directly into the aerodynamic surface material itself. By dispersing piezoelectric or piezoresistive particles within the structural material, the sensing capability becomes an intrinsic property of the surface rather than an attached component. This eliminates any surface irregularities while maintaining aerodynamic smoothness, as the sensing particles are embedded at the material level.
4Measurement precision
If conventional sensors are placed on structures to detect acceleration, then acceleration data can be obtained, but the sensors are easily broken and do not conform to curved surfaces
Solution Approach 1:
The patent combines the acceleration sensing function with the structural material by embedding piezoelectric or piezoresistive particles within the material matrix. The sensing particles are protected by the surrounding structural material, eliminating the fragility of conventional exposed sensors. The integrated structure-sensing system moves as one unit, perfectly tracking acceleration while being protected from damage.
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
Enables efficient, nondestructive evaluation of structural soundness across entire structures, including complex shapes, with enhanced signal interpretation and reduced risk of spurious echoes, and can function as a built-in accelerometer for triggering safety features or arming devices.
Implementation Method 1
the structural member includes a continuous structural material, and a plurality of piezoelectric material particles in the continuous structural material; and receiving electrical signals from the at least one conductive pickup, wherein the signals are indicative of electrical fields in the structural member caused by stresses induced in the structural member by acceleration of the vehicle
Data Source
Figure 1~2
AI summary
A load-bearing structural member (12) has a continuous structural material (14) with piezoelectric material particles (16) mixed in throughout. The structural material may be any of a variety of suitable materials, such as polymer materials, composite materials, ceramic materials, or concrete. The piezoelectric material particles may be used for evaluating the soundness of the structural member, such as in quality control or structural health monitoring processes. The structural member may include one or more conductive pickups (20) used for receiving signals from the structural member. The signals may be induced by introducing ultrasonic signals or vibrational resonance signals into the structural member. The response from such induced signals may be used for quality control purposes or structural health monitoring. Piezomagnetic, electro-strictive, or magneto-strictive material particles (18) may also be spread throughout the structural material, to amplify and otherwise enhance the signals from the piezoelectric material particles.