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S. Engleder, H. Springer:
"Dynamic Analysis and Nonlinear Control of an Injection Moulding Machine";
Talk: ECCOMAS Multibody Dynamics 2005, Madrid; 2005-06-21 - 2005-06-24; in: "Multibody Dynamics 2005", J. M. Goicolea, J Cuadrado, J. C. Garcia Orden (ed.); (2005), ISBN: 84-7493-353-6; 16 pages.

This paper presents an application of the nonlinear feedback linearization method for improving the dynamic characteristics of the clamping unit of an injection moulding machine. To predict the dynamic behaviour of the machine in real-life a multibody simulation of the toggle mechanism is developed. Since the characteristics of the hydraulic system play an important role, the simulation model also contains hydraulic components, such as accumulator, proportional valve and hydraulic cylinder. A simplified plant model with a reduced number of parameters is then used to design a controller which is based on the method of feedback linearization. The introduced control scheme possesses a cascade structure and consists of two loops. First, the inner actuator control loop controlling the clamping cylinder´s pressure force and second, the outer loop controlling the crosshead´s movement along a given motion trajectory. This motion trajectory of the toggle mechanism is optimized off-line with respect to the time period necessary for closing and opening the mould. Therefore, the cycle time of the production process becomes a minimum under given constraints of the toggle mechanism. The simulation results presented in the paper show significant improvements compared with an existing control concept.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05936733