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Single and multi-objective real-time optimisation of an industrial injection moulding process via a Bayesian adaptive design of experiment approach
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Single and multi-objective real-time optimisation of an industrial injection moulding process via a Bayesian adaptive design of experiment approach
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Journal Article
Single and multi-objective real-time optimisation of an industrial injection moulding process via a Bayesian adaptive design of experiment approach
2024
Overview
Minimising cycle time without inducing quality defects is a major challenge in injection moulding (IM). Design of Experiment methods (DoE) have been widely studied for optimisation of injection moulding, however existing methods have limitations, including the need for a large number of experiments within a pre-determined search space. Bayesian adaptive design of experiment (ADoE) is an iterative process where the results of the previous experiments are used to make an informed selection for the next design. In this study, an experimental ADoE approach based on Bayesian optimisation was developed for injection moulding using process and sensor data to optimise the quality and cycle time in real-time. A novel approach for the real-time characterisation of post-production shrinkage was introduced, utilising in-mould sensor data on temperature differential during part cooling. This characterisation approach was verified by post-production metrology results. A single and multi-objective optimisation of the cycle time and temperature differential (
) in an injection moulded component is proposed. The multi-objective optimisation techniques, composite desirability function and Nondominated Sorting Genetic Algorithm (NSGA-II) using the Response Surface Methodology (RSM) model, are compared with the real-time novel ADoE approach. ADoE achieved almost a 50
reduction in the number of experiments required for the single optimisation of
, and an almost 30
decrease for the optimisation of
and cycle time together compared to composite desirability function and NSGA-II. The optimal settings identified by ADoE for multiobjective optimisation were similar to the selected Pareto optimal solution found by NSGA-II.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
