KEYWORDS: Transducers, Sensors, Actuators, Control systems, Amplifiers, Resistance, Dynamical systems, Signal detection, Signal processing, Intelligence systems
Guiding systems figure amongst the central components in the flux of a machine tool. Their characteristics have a direct
impact on machining accuracy. Hydrostatic guiding systems are preferably used when specific requirements are to be
met with regards to accuracy, stiffness and damping. However, an active intervention in the guiding system of such
conventional systems, i.e. to absorb geometrical guiding rail errors, has so far not been possible. Compared to modular,
conventional systems, adaptronic systems offer considerable cost savings potentials thanks to their increased functional
degree of integration [1].
An adaptronic strut, developed for compensation of the influence of geometric faults in machine tools with parallel
kinematic structure, is examined. A simple oscillator model of the strut is built. First, the equations of motions
for this simplified model are derived analytically. These information are used for designing a single variable
state control based on the principles of the optimal least quadratic regulator (LQR). Afterwards, the controller
concept is extended applying an additional PI-controller. Secondly, the strut is modeled using the commercial
multi-body system simulation software Msc.Adams. The required system state which is not explicitly given
within Msc.Adams primarily has to be estimated. For this task a Luenberger observer is implemented. A
similar single variable state control is developed and both designs are compared among themselves when the
adaptronic strut is examined under external loads. Finally, the strut is implemented into the model of the
complete machine tool and its influence on the behavior of the machine tool is treated.
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