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Compensation of Linear Encoder of Maching Center
Štěpánek, Vojtěch ; Šooš, Ĺubomír (referee) ; Suchánek, Rostislav (referee) ; Marek, Jiří (advisor)
A CNC machine tool is a complex mechatronic system whose behaviour is influenced by a change in temperature gradient. Nowadays, we could state that under certain conditions it is a cyber-physical system. From this point of view, there are two approaches to solve this problem. One direction solves the whole machine using a suitable method as a whole. Models are often very complex and their reliability is often questi-onable. This work deals with the decomposition of the machine using a systems approach, with the intention of finding the dependencies between the geometric error of the on-axis position accuracy and the temperature gradient. Then, using a suitable virtual model, predict the evolution of the temperature error and based on this prediction, make actionable interventions in the machine tool control system to eliminate the on-axis homing error as much as possible. One of the basic building blocks of the machine tool in terms of positioning is the linear encoder, which acts as a direct feedback member of the axis position control. Therefore, this publication is mainly devoted to the thermal behaviour of the linear encoder.
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