Modelling and Control of Stamping Speed in a Hydraulic Extrusion Press
(2026)Department of Automatic Control
- Abstract
- This thesis investigates the control of stamping speed in a hydraulic extrusion press at Alleima, with the aim of reducing oscillations at the start of the process and achieving faster stabilisation. A simplified digital model of the press was developed in Simulink to capture the key system dynamics and enable simulation-based evaluation of control strategies.
Initial work focused on the existing control structure, including anti-windup and control initiation timing. Although improvements were observed in simulation, they did not fully translate to the real system. Further analysis showed that the behaviour was strongly influenced by the inner valve-position control loop rather than by the outer speed controller alone. In particular,... (More) - This thesis investigates the control of stamping speed in a hydraulic extrusion press at Alleima, with the aim of reducing oscillations at the start of the process and achieving faster stabilisation. A simplified digital model of the press was developed in Simulink to capture the key system dynamics and enable simulation-based evaluation of control strategies.
Initial work focused on the existing control structure, including anti-windup and control initiation timing. Although improvements were observed in simulation, they did not fully translate to the real system. Further analysis showed that the behaviour was strongly influenced by the inner valve-position control loop rather than by the outer speed controller alone. In particular, nonlinear effects and hysteresis-like behaviour in the pilot-valve actuation had a significant influence on system performance.
Mid-ranging control was also evaluated in simulation as a method to coordinate valves with different dynamics. Results indicate improved robustness and reduced risk of actuator saturation under increased load, although the method was not implemented in the real system due to time constraints.
Overall, the study shows that reliable valve control is essential for achieving stable and efficient operation. Future work should focus on implementing mid-ranging and further refining control strategies for varying operating conditions. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/student-papers/record/9245444
- author
- Persson, Hugo and Åkerman, Henrik
- supervisor
- organization
- year
- 2026
- type
- H3 - Professional qualifications (4 Years - )
- subject
- report number
- TFRT-6309
- other publication id
- 0280-5316
- language
- English
- id
- 9245444
- date added to LUP
- 2026-06-29 14:38:42
- date last changed
- 2026-07-06 09:06:22
@misc{9245444,
abstract = {{This thesis investigates the control of stamping speed in a hydraulic extrusion press at Alleima, with the aim of reducing oscillations at the start of the process and achieving faster stabilisation. A simplified digital model of the press was developed in Simulink to capture the key system dynamics and enable simulation-based evaluation of control strategies.
Initial work focused on the existing control structure, including anti-windup and control initiation timing. Although improvements were observed in simulation, they did not fully translate to the real system. Further analysis showed that the behaviour was strongly influenced by the inner valve-position control loop rather than by the outer speed controller alone. In particular, nonlinear effects and hysteresis-like behaviour in the pilot-valve actuation had a significant influence on system performance.
Mid-ranging control was also evaluated in simulation as a method to coordinate valves with different dynamics. Results indicate improved robustness and reduced risk of actuator saturation under increased load, although the method was not implemented in the real system due to time constraints.
Overall, the study shows that reliable valve control is essential for achieving stable and efficient operation. Future work should focus on implementing mid-ranging and further refining control strategies for varying operating conditions.}},
author = {{Persson, Hugo and Åkerman, Henrik}},
language = {{eng}},
note = {{Student Paper}},
title = {{Modelling and Control of Stamping Speed in a Hydraulic Extrusion Press}},
year = {{2026}},
}