AFP Heater Power Control for Uniform Composite Layup Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Automated Fiber Placement (AFP) machines face challenges in uniformly heating complex geometries of composite laminates, leading to potential overheating or underheating during the layup process, which can affect the adhesion and curing of the material.
Innovation Solution
The AFP machine dynamically adjusts the power of its heater based on the distance of the heating surface to the laminate and the speed of the end effector, using pre-determined or real-time distance data from sensors to ensure the laminate reaches a desired temperature, thereby preventing overheating and underheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heater is used to heat the laminate during AFP machine operation, then the adhesion of tows to the laminate is improved, but overheating or underheating may occur leading to non-uniform heating
Solution Approach 1:
The heater power is dynamically adjusted in real-time based on the measured distance between the heater and laminate surface. The control system continuously monitors distance sensor data and modifies heater power output accordingly, transitioning from static to dynamic control to maintain uniform heating across varying geometries
Solution Approach 2:
A feedback control loop is implemented where distance sensor measurements are fed back to the control system, which then adjusts heater power based on the current distance. This closed-loop system ensures that heating conditions are continuously optimized to prevent overheating or underheating
Solution Approach 3:
The heater power is locally adjusted based on the specific distance conditions at different locations on the laminate surface. By applying different power levels to different regions based on their specific geometric characteristics, uniform heating is achieved across complex surfaces
2Adaptability or versatility
If the AFP machine moves at varying speeds during layup, then complex geometries can be accommodated, but the heating consistency is compromised
Solution Approach 1:
The system dynamically coordinates heater power adjustment with head speed variations. As the head speed changes to accommodate complex geometries, the heater power is simultaneously adjusted to maintain consistent thermal conditions, creating a dynamic coupling between motion control and thermal control
Solution Approach 2:
The system changes multiple parameters simultaneously - both the head speed and heater power are adjusted in coordination. By changing these parameters together based on real-time distance measurements, the system maintains heating consistency while adapting to varying geometries and speed requirements
3Shape
If the distance between the heater and laminate varies during layup, then complex shapes can be formed, but heating uniformity deteriorates
Solution Approach 1:
Distance sensors provide continuous feedback on the heater-to-laminate gap, which is used by the control system to adjust heater power in real-time. This feedback mechanism compensates for distance variations caused by complex geometries, maintaining uniform heating despite shape variations
Solution Approach 2:
The heater power is locally optimized for each position based on the local distance to the laminate surface. By applying tailored power levels to different locations according to their specific geometric conditions, uniform heating is achieved across complex three-dimensional shapes
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 ensures uniform heating of the laminate, enhancing the adhesion and curing process, especially for complex geometries, by dynamically adjusting the heat application in real-time, thus improving the quality and consistency of the composite parts produced.
Implementation Method 1
a heater at the AFP machine heats the laminate. Heating the laminate ensures that the tows will properly adhere to the laminate at a desired level of tack
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Systems and methods are provided for dynamically managing heater position for an Automated Fiber Placement (AFP) machine. One embodiment is a method that includes retrieving distance data indicating predicted distances of a heating surface of a heater of the AFP machine to a surface of a laminate being laid-up by the AFP machine, for each of multiple locations along a path. The method also includes directing the AFP machine to lay up the laminate in accordance with a Numerical Control (Numerical Control) program, identifying a current location of the heater in the path, determining a speed at which the heater of the AFP machine is moving, correlating the current location of the heater with a predicted distance, and adjusting an amount of power for the heater at the current location based on the predicted distance that was correlated with the current location, and the speed at the current location.