2026-09-20T21:58:21Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/115709 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Alleyne, Andrew G 2022-05 application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01 The student, Kurtis Kuipers, accepted the attached license on 2022-04-18 at 09:55. The student, Kurtis Kuipers, submitted this Thesis for approval on 2022-04-18 at 10:00. This Thesis was approved for publication on 2022-04-27 at 16:08. DSpace SAF Submission Ingestion Package generated from Vireo submission #17731 on 2022-11-11 at 12:47:05 Robust bead width manipulation and control for military additive construction operations in expeditionary environments Kuipers, Kurtis 2022-04-27 additive manufacturing 3D printing concrete mortar cement CERL additive construction control US Army Since the introduction of large-scale additive manufacturing with cement-based materials, there has been a need to develop robust control systems to improve the accuracy and increase the automation capabilities of the manufacturing process. In this thesis, a robust control system is developed to manipulate the width of the extruded concrete bead while printing. The system is designed to work with a printer that is intended for use in expeditionary, military environments. The system generates a process map that correlates the width of the extruded concrete bead to the velocity of the gantry printer. To accomplish this, a calibration print is designed that varies the gantry velocity along the print path and holds a constant pump speed. After the calibration print is printed, an advanced scanning apparatus is used to the measure the bead width along the entire print. A process map is then generated from the resulting measurements. From the process map, desired printing parameters are selected and input into the G-code to achieve the desired bead width. This method enables military operators to select multiple bead widths to be implemented in prints regardless of the rheological properties of the cement-based material that is being extruded. The end result of this robust control system is the ability to manipulate the bead width during large-scale additive construction prints to within ± 1/4”, on average. Furthermore, the entire process from the start of the calibration print to the implementation of new printing parameters is completed in less than 5 minutes. Thesis eng https://hdl.handle.net/2142/115709 Copyright 2022 Kurtis Kuipers M.S. Thesis Mechanical Engineering University of Illinois at Urbana-Champaign Mechanical Sci & Engineering