Tape Layup Thermographic Inspection for Real-Time Defect Detection
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Solution Overview
Problem
Current tape layup machines face challenges in detecting and correcting out-of-tolerance conditions during the fabrication of composite parts, such as misaligned or foreign debris on the laminate, due to the difficulty in visually distinguishing between the tape and the underlying laminate, leading to potential waste and resource inefficiency in large composite parts like aircraft wings.
Innovation Solution
The integration of thermographic inspection systems with infrared cameras on tape layup machines, which apply heat to create temperature differences between the laminate and the tape, allowing for real-time detection of tape boundaries, foreign debris, and inconsistencies through thermal imaging, enabling immediate reporting and correction during the layup process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If visual inspection methods are used to detect tape placement accuracy, then the inspection process is simple, but the detection precision is insufficient because lanes of tape are the same color as the underlying laminate
Solution Approach 1:
The patent changes the physical parameter being measured from visual color detection to thermal property detection. By measuring temperature differences between the tape and underlying laminate using infrared thermography, the system overcomes the limitation of identical colors while maintaining an automated inspection process.
Solution Approach 2:
The patent replaces the mechanical/visual inspection system with a thermal imaging system. Instead of using human vision or simple optical sensors to detect tape placement, the system uses infrared cameras to detect thermal signatures, substituting a different physical domain for measurement.
2Stability of the object's composition
If inspection is performed after hardening the laminate, then the composite part structure is complete, but the loss of time and resources is substantial for large parts requiring rework or discarding
Solution Approach 1:
The patent performs inspection during the layup process itself, before the laminate is fully constructed and hardened. By detecting defects in real-time during tape placement, the system allows for immediate correction, preventing the need to complete and then rework or discard entire large composite parts.
Solution Approach 2:
The patent implements real-time feedback by continuously monitoring tape placement quality during the layup process. The infrared camera system provides immediate detection of defects, allowing the control system to alert operators or automatically adjust parameters to correct issues before they propagate through the entire laminate structure.
3Measurement precision
If manual inspection is performed before curing, then human judgment can identify potential issues, but foreign debris may be introduced during the inspection process
Solution Approach 1:
The patent replaces manual visual inspection with automated infrared thermographic inspection. This substitution eliminates the need for human inspectors to physically approach and touch the laminate, thereby preventing introduction of foreign debris such as lint or skin particles while maintaining high detection accuracy through thermal imaging.
Solution Approach 2:
The laminate essentially inspects itself by emitting thermal radiation that can be detected without physical contact. The infrared camera system captures thermal signatures from the laminate surface, allowing the material to reveal its own condition without requiring external physical intervention that could contaminate it.
4Device complexity
If current inspection techniques are used, then the equipment complexity is low, but the productivity is reduced due to inability to perform real-time course by course inspection
Solution Approach 1:
The infrared camera system serves multiple functions: it detects tape placement accuracy, identifies foreign debris, monitors temperature distribution, and provides real-time feedback for process control. This multi-functional capability increases productivity without proportionally increasing equipment complexity, as a single thermal imaging system performs what would otherwise require multiple specialized inspection devices.
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 enhances the accuracy and efficiency of the tape layup process by allowing for real-time inspection and correction, reducing waste and labor costs by identifying and addressing out-of-tolerance conditions before the laminate is cured, thereby improving the quality and reducing the need for reworking composite parts.
Implementation Method 1
a heater at the head may generate a detectable temperature difference between the underlying laminate and the lanes of tape, by heating either the underlying laminate or the lanes of tape
Implementation Method 2
These inspection systems utilize infrared cameras to acquire thermal images of lanes of tape applied by the head
Data Source
AI summary
Systems and methods are provided for thermal inspection of tape layup. One embodiment is a method for performing inspection of a tape layup. The method comprises laying up tape onto a surface of a laminate, applying heat to tack the tape to the surface, and generating thermographic images of the tape as applied to the surface.