Ultrasonic Debunking Control for Composite Laminates
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Solution Overview
Problem
Conventional ultrasonic debulking and welding techniques for laminates face challenges such as excessive heating, which can lead to unintended curing and degradation of thermosetting resin components, resulting in reduced mechanical properties and substandard quality laminates, while also being time-consuming and costly.
Innovation Solution
An apparatus and method that dynamically control ultrasonic vibration amplitude, force, feed rate, angle, and processing interval based on the temperature of the laminate surface, using proportional, integral, differential, fuzzy logic, or neural network control methodologies to optimize the debulking and welding process, reducing the risk of excessive heating and improving laminate quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ultrasonic debulking techniques are applied to reduce processing time, then productivity is improved, but excessive heating occurs causing inadvertent curing and degradation of thermosetting resin
Solution Approach 1:
The patent implements dynamic control of ultrasonic processing parameters including real-time adjustment of amplitude, force, feed rate, angle, and processing interval based on temperature feedback. This dynamic adaptation allows the system to maintain high productivity while preventing excessive heating by continuously adjusting parameters during the debulking process.
Solution Approach 2:
The system incorporates temperature sensing and feedback control mechanisms that monitor laminate surface temperature and adjust ultrasonic processing parameters accordingly. This feedback loop enables the system to respond to temperature changes in real-time, preventing inadvertent curing while maintaining efficient debulking operations.
2Manufacturing precision
If conventional ultrasonic welding is applied to join laminate layers, then manufacturing precision is improved, but device complexity increases due to multiple processing parameters
Solution Approach 1:
The ultrasonic processing system is designed to perform multiple functions including debulking, welding, and temperature control through a single integrated apparatus. This multi-functionality reduces the need for separate processing equipment while maintaining high manufacturing precision through unified control of all parameters.
Solution Approach 2:
The system achieves precise welding quality by dynamically adjusting multiple parameters (amplitude, force, feed rate, angle, processing interval) based on real-time temperature feedback. This coordinated parameter control enables consistent weld quality while the integrated control system manages the complexity of multiple variables.
3Manufacturing precision
If multiple debulking cycles are applied to thick composite parts to reduce bulk, then manufacturing precision is improved, but loss of time increases significantly
Solution Approach 1:
The ultrasonic debulking process enables continuous processing of thick composite parts through multiple plies in a single operation. The system maintains effective debulking action across the entire laminate thickness by adjusting parameters such as processing interval and feed rate, eliminating the need for multiple separate debulking cycles and significantly reducing total processing time.
Solution Approach 2:
The system dynamically adjusts processing parameters including amplitude, force, and processing interval based on laminate thickness and temperature feedback. This dynamic adaptation allows the system to effectively debulk thick composite parts in a single continuous operation while maintaining the quality normally requiring multiple cycles.
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 significantly reduces processing time, labor, and costs, while maintaining or improving the mechanical properties of the laminates by adaptively controlling the debulking and welding process, ensuring higher quality and reduced residual bulk.
Implementation Method 1
The ultrasonic horn is energized to induce cyclical deformation in the plies to heat the plies, reduce the resin's viscosity, and enhance wetting of the fibers with resin
Implementation Method 2
The ultrasonic vibration produces mechanical vibration and viscoelastic heating in composite laminate 105
Implementation Method 3
the ultrasonic vibration helps entrapped gases to coalesce and form larger bubbles, which can be more easily pushed out under the 'sweeping' motion of the vibrating ultrasonic horn
Implementation Method 4
Layers or plies of laminate materials may be ultrasonically welded to adjacent layers or plies
Data Source
AI summary
A method for ultrasonic debulking a composite laminate (105) includes the steps of defining a path (115) across the laminate, the path having a starting location and an ending location and applying a force (109) to and transmitting ultrasonic vibration (111) into the laminate along the path, beginning at the starting location and ending at the ending location. The method further includes determining a temperature of a surface (103, 123) of the laminate proximate to the path and varying at least one of an amplitude of the ultrasonic vibration, the applied force, a feed rate at which the force and the ultrasonic vibration are applied along the path, an angle at which the ultrasonic vibration is applied to the laminate, and an interval at which plies of the laminate are processed, based upon the determined temperature of the surface of the laminate.