Autoclave Volume Utilization via CFD and Hardware Modifications
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Solution Overview
Problem
Autoclaves face inefficiencies in volume utilization due to non-uniform temperature distributions, limiting the placement of composite parts and reducing the usable volume, as well as challenges in monitoring airflow and temperature variations during the curing process.
Innovation Solution
A method involving computational fluid dynamics (CFD) modeling to determine and modify airflow patterns, temperature variations, and turbulent intensity within the autoclave by implementing hardware changes such as diffusion screens, baffles, insulation, and fan speed adjustments to optimize part arrangement and maximize the number of parts meeting quality criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If parts are positioned in areas of low or high temperature to avoid quality issues, then manufacturing precision is improved, but the usable volume of the autoclave is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the autoclave configuration through hardware changes such as adding diffusion screens at air inlets, installing baffles, adjusting fan speeds, and modifying tool configurations. These changes alter the airflow patterns and temperature distribution parameters within the autoclave, creating more uniform temperature fields that expand the usable volume while maintaining curing quality.
Solution Approach 2:
The patent introduces intermediary elements such as diffusion screens and baffles that mediate the airflow and temperature distribution within the autoclave. These intermediaries redirect and homogenize the thermal field, allowing parts to be positioned in previously unusable low or high temperature zones without compromising curing quality, thereby increasing usable volume.
2Manufacturing precision
If the autoclave is run at high temperature and high pressure to ensure curing quality, then manufacturing precision is improved, but the ability to monitor and sense airflow becomes difficult
Solution Approach 1:
The patent replaces direct mechanical monitoring of airflow with computational fluid dynamics (CFD) modeling. The CFD simulations predict airflow patterns, temperature variations, and turbulent intensity distributions under high temperature and pressure conditions, eliminating the need for physical sensors that would be difficult to implement and interpret in the harsh autoclave environment.
Solution Approach 2:
The patent creates a virtual copy of the autoclave interior through CFD modeling. This digital twin replicates the thermal and fluid dynamics behavior, allowing researchers to visualize and analyze airflow patterns, temperature fields, and turbulent intensity without physically inserting measurement devices into the high-temperature, high-pressure environment.
3Productivity
If hardware changes are made to alter airflow patterns and improve temperature uniformity, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by using CFD modeling to simulate and evaluate different hardware configuration scenarios before implementing physical changes. This allows the identification of optimal configurations (diffusion screen placement, baffle positioning, fan speed settings) that maximize temperature uniformity and curing capacity, ensuring that hardware modifications are made efficiently and effectively.
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 enhances the curing capacity of the autoclave, reduces costs, and increases yield by ensuring more parts meet quality requirements, without the need for new capital investments, by optimizing airflow and temperature uniformity within the autoclave.
Implementation Method 1
adding a diffusion screen at an air inlet
Implementation Method 2
adding baffles in the autoclave
Implementation Method 3
adding insulation between a part and a tool
Implementation Method 4
changing fan speed
Data Source
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AI summary
A method of optimizing an autoclave volume utilization includes, in an exemplary embodiment, determining process parameters of an autoclave (10); modeling an autoclave configuration to determine airflow patterns in the autoclave, temperature variation throughout the autoclave, and the distribution of turbulent intensity in the autoclave; and modifying the autoclave configuration with hardware changes to the autoclave to alter the airflow patterns in the autoclave. The method also includes modeling the modified autoclave configuration to determine modified airflow patterns in the autoclave, modified temperature variation throughout the autoclave, and the modified distribution of turbulent intensity in the autoclave; and modeling the modified autoclave configuration with parts (24) to be cured in the modified autoclave configuration to determine an arrangement of parts that maximizes the number of parts in the autoclave that meet predetermined cured properties of the parts.