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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