Acoustic Panel Laser Perforation With Optical Emission Feedback
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Solution Overview
Problem
Laser machining for acoustic panels often damages the core walls and adhesive bonds, leading to a degradation of the structural load-carrying capability, which is undesirable in certain applications.
Innovation Solution
A manufacturing process that uses a laser system in conjunction with a sensor to sense optical emissions during perforation formation, allowing for real-time determination of whether to continue or terminate the perforation based on the material being ablated, thereby minimizing damage to the core and adhesive bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser machining is used to form perforations in the first skin, then the perforation formation speed and precision are improved, but the core walls and adhesive bonds are damaged leading to degraded structural load carrying capability
Solution Approach 1:
The patent employs a sensor system that detects optical emissions (plasma) during laser machining to provide real-time feedback on the laser's interaction with different materials. When the sensor detects plasma emissions indicating the laser has reached the core walls or adhesive bonds, the system automatically adjusts or terminates the machining process to prevent damage, thus resolving the contradiction between perforation precision and structural strength preservation
Solution Approach 2:
The patent implements partial perforation formation by stopping the laser machining process before completely penetrating through the first skin when plasma emissions are detected. This partial action approach prevents damage to underlying structures while still achieving the desired acoustic panel functionality, balancing perforation effectiveness with structural integrity
2Manufacturing precision
If the laser beam is directed to form perforations aligned with core walls, then the perforation positioning accuracy is improved, but the core walls and adhesive bonds are cut or weakened
Solution Approach 1:
The sensor system provides real-time feedback by detecting plasma emissions that occur when the laser interacts with core wall materials or adhesive bonds. This feedback mechanism allows the system to maintain precise perforation positioning while automatically detecting when the laser approaches critical structures, enabling the operator to adjust the machining parameters or terminate the process before damage occurs
3Strength
If traditional techniques such as mechanical drilling or grit ablation are used to form perforations, then the structural integrity is better preserved, but the manufacturing complexity and time consumption increase
Solution Approach 1:
The patent replaces traditional mechanical drilling or grit ablation systems with a laser-based machining system. The laser provides a non-contact, highly precise method for forming perforations with minimal mechanical stress on the structure. When combined with plasma detection feedback, the laser system achieves both high manufacturing efficiency and structural integrity preservation, eliminating the trade-off present in traditional methods
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 process effectively reduces damage to the acoustic panel's structural integrity by accurately controlling the laser perforation process, ensuring that only the intended material is ablated and maintaining the panel's load-carrying capability.
Implementation Method 1
partially forming a first perforation in the first skin using a laser beam
Implementation Method 2
the laser beam, beginning formation of a first perforation in the first skin
Implementation Method 3
operating a sensor to sense optical emissions produced during the partial forming of the first perforation
Data Source
AI summary
A manufacturing process is provided that includes steps of: providing a panel comprising a core connected to a first skin, wherein the panel is configured with a plurality of cavities extending through the core to the first skin; partially forming a first perforation in the first skin using a laser beam; operating a sensor to sense optical emissions produced during the partial forming of the first perforation; and determining, based on an output of the sensor, whether to: continue formation of the first perforation in the first skin; or terminate formation of the first perforation in the first skin.