Structural health monitoring sensory arrangement integrated within a self-healing system

Patent metadata

Field	Value
Publication number	US-9897533-B2
Application number	US-201414309484-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 19, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

An integrated system and method to acquire the health state of a structure identifying the presence of damage, and to self-repair the damage in the considered structure. A sensor network installed in the structure is interrogated by a dedicated hardware for damage detection. In case of damage is detected by the sensor network in the structure, the sensor network is triggered and generates harmonic excitation in the structure. Due to the excitation, the natural frequency of vascular microtubes and/or capsules presented in the structure is reached, promoting their disruption. The vascular microtubes and/or capsules disruption along the damage releases the healing compound, repairing the damaged portion of the structure.

First claim

The invention claimed is:

1. A system for assessing the condition of and self-repairing a structural platform comprising:
a Structural Health Monitoring System (SHM) comprising a plurality of transducers, including a plurality of pairs of actuators and sensors, a generator device to excite the at least one of said sensors to produce ultrasonic guided waves and a signal processor device to receive signals of damage detected in the structural platform;
a Self-Healing System (SHS) comprising a self-healing material including a matrix of at least one polymer material, wherein a set of vascular microtubes or capsules are uniformly distributed and embedded in the matrix, the set of vascular microtubes or capsules containing a liquid healing-agent, the Self-Healing System is configured to create harmonic response achieving a natural frequency of the vascular microtubes or capsules thereby causing resonance or other constructive interference that disrupts the vascular microtubes or capsules so the vascular microtubes or capsules release the liquid agent to self-heal and repair detected structural damage in the damaged region; and
wherein the SHM system and the SHS system are integrated with a unique or distinct network of the sensors and plurality of pairs of actuators, wherein:
the integrated system (SHM+SHS) is exclusively one box control, or with box control separated for SHM and SHS.

2. The system according to claim 1 , wherein the sensors comprise fiber optics sensors or piezoelectric sensors.

3. The system according to claim 1 , wherein the structural health monitoring system uses electromechanical impedance or acoustic emission.

4. The system according to claim 1 , wherein the network of the sensors and plurality of pairs of actuators is embedded in the structure.

5. The system according to claim 1 , wherein the generator device for the excitation is a mechanical, electrical, and/or thermal generator.

6. The system according to claim 1 , wherein the generator device for the excitation is the SHM system or the SHS system or another independent system.

7. The system according to claim 1 , wherein the self-healing system comprises agents microencapsulated or microvascular networks or crosslinked thermo-reversible or adding an additive in thermoplastic thermofix matrix or elastomers with supramolecular structures with hydrogen bonds or molecular interdiffusion or repair photoinduced or living polymer.

8. The system according to claim 1 , wherein the self-healing system comprises microencapsulated agents.

9. The system according to claim 1 , wherein the self-healing system comprises microvascular networks.

10. The system according to claim 1 , wherein the self-healing system comprises crosslinked thermo-reversible.

11. The system according to claim 1 , wherein the self-healing system comprises thermoplastic thermofix matrix activatable by adding an additive.

12. The system according to claim 1 , wherein the self-healing system comprises elastomers with supramolecular structures with hydrogen bonds.

13. The system according to claim 1 , wherein the self-healing system comprises elastomers with supramolecular structures with molecular interdiffusion.

14. The system according to claim 1 , wherein the self-healing system comprises elastomers with supramolecular structures with repair photoinduced polymer.

15. The system according to claim 1 , wherein the self-healing system comprises elastomers with supramolecular structures with living polymer.

16. The system according to claim 1 , wherein the network of the sensors and plurality of pairs of actuators is not embedded in the structure.

17. An integrated system for assessing the condition of and self-repairing a structural platform comprising:
a plurality of actuators and sensors,
at least one generator coupled to the plurality of actuators, the at least one generator exciting at least one of said plurality of actuators to produce ultrasonic guided waves,
a signal processor coupled to the sensors, the signal processor is configured to process signals representing waves the sensors receive that are detected from damage in the structural platform to identify a damaged region;
a self-healing material including a matrix of at least one polymer material and vascular microtubes or capsules distributed and embedded in the material, the vascular microtubes or capsules containing a liquid healing-agent,
the signal processor is configured to control the at least one generator to selectively create harmonic response achieving a natural frequency of the vascular microtubes or capsules thereby causing resonance or other constructive interference that disrupts the vascular microtubes or capsules so the vascular microtubes or capsules release the liquid agent to self-heal and repair structural damage in the identified damaged region.

Assignees

• Embraer Sa

Inventors

• Da Silva Paulo Anchieta
• Dotta Fernando
• Rulli Ricardo Pinheiro

Classifications

• G01N27/02

  by investigating impedance · CPC title

• B05D5/005

  Repairing damaged coatings · CPC title

• B05C9/10

  the auxiliary operation being performed before the application (B05C9/14 takes precedence) · CPC title

• G01N2291/2694

  Wings or other aircraft parts · CPC title

• G01N29/09

  by measuring mechanical or acoustic impedance · CPC title