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Model-based pressure tracking using a feedback linearisation technique in thermoplastic injection moulding

Injection moulding is a well-established automated process for manufacturing a wide variety of plastic components in large volumes and with high precision. There are, however, process control challenges associated with each stage of injection moulding, which should be monitored and controlled precisely to prevent defects in the injection moulded component. One of the process variables is the pressure profile during the injection and packing phases, which has a direct impact on the quality of the manufactured part. This research proposes a model-based controller design for the injection and cavity pressure during the moulding cycle, with a feedback linearisation controller. First, the injection and packing phases were mathematically modelled and converted to a state-space model. The procedure of designing the controller for the process was outlined. A pressure profile was defined as the target trajectory in the proposed controller and the ability of the designed controller to follow the set profile was explored.

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