Acoustic Signal Control for Composite Sheet Defect Detection
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Solution Overview
Problem
Current methods for manufacturing composite materials, such as prepregs and laminates, face challenges in detecting defects like voids and delaminations during the layup process, which can lead to material strength reduction and increased manufacturing costs due to inefficiencies in resin impregnation and quality control, especially in large or complex shapes.
Innovation Solution
A method involving the application of acoustic or electromagnetic signals, like ultrasound, to interact with the sheet material, detect modifications, and compare these with predetermined parameters to adjust process steps in real-time, ensuring continuous quality control and defect detection during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional layup process is used for manufacturing composite materials, then manufacturing simplicity is maintained, but defect detection capability deteriorates
Solution Approach 1:
The patent introduces an intermediary substance (such as a contrast agent or marker) that is applied to or within the composite material during the layup process. This intermediary enables defect detection by acoustic or electromagnetic signals without fundamentally changing the manufacturing process, thus maintaining ease of manufacture while significantly improving defect detection capability.
Solution Approach 2:
The patent replaces traditional mechanical inspection methods with non-contact acoustic or electromagnetic signal-based detection. This substitution allows for real-time defect detection during manufacturing without adding mechanical complexity to the layup process, resolving the contradiction between manufacturing simplicity and defect detection capability.
2Measurement precision
If multiple inspection methods are applied to composite materials, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs a single inspection device capable of performing multiple measurement functions simultaneously. The device can detect various types of defects (voids, delaminations, resin-rich areas) using different physical principles (acoustic, electromagnetic, or combined methods) within one integrated system, thereby improving measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The patent merges multiple inspection capabilities into one unified system. By combining acoustic and electromagnetic detection methods in a single device, the patent achieves comprehensive defect detection with high measurement precision while avoiding the complexity of operating separate inspection equipment.
3Manufacturing precision
If real-time defect detection is implemented during manufacturing, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where defect detection results from acoustic or electromagnetic signals are immediately fed back to the manufacturing process. This real-time feedback allows for immediate correction of manufacturing parameters (such as resin application, consolidation pressure, or temperature) to prevent defect formation, thereby improving manufacturing precision without requiring overly complex process control systems.
Solution Approach 2:
The patent performs preliminary defect detection during the manufacturing process itself, before the composite material is fully cured or finalized. By detecting potential defects early in the manufacturing sequence, the system can take corrective action while the material is still workable, improving manufacturing precision without requiring complex post-processing inspection and repair systems.
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 approach allows for in-line defect detection and compensation, reducing rework and scrap, ensuring the produced composite materials meet desired quality criteria, thereby minimizing waste and maintaining high load-bearing capabilities.
Implementation Method 1
applying an acoustic signal or electromagnetic signal to interact with the sheet material whereby the interaction modifies the applied signal
Implementation Method 2
applying an acoustic signal or electromagnetic signal to interact with the sheet material whereby the interaction modifies the applied signal
Data Source
AI summary
A method of controlling a process for the manufacture of a multicomponent sheet material having a desired pre-determined parameter comprising applying an acoustic or an electromagnetic signal to interact with the sheet material whereby the interaction modifies the applied signal, detecting the modified signal, comparing the modified signal or data derived from it with data relating to the pre-determined parameter and modifying at least one step of the process whereby the data relating to the modified signal is modified towards the data relating to the pre-determined parameter.