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The Power Mechatronics working group deals with the interaction of the classical engineering sciences of mechanical engineering, electrical engineering and information technology. The research focuses range from classic electrical drive technology to power electronics in combination with modern control technology and "energy conditioning" in electrical energy distribution networks.
One research project of this working group deals with a well-known problem in the rolling mill sector, which can significantly impair the quality of the rolled material: The so-called "chatter vibrations" are self-excited vibrations that occur between the top and bottom roll of a mill stand. They cannot be damped using conventional methods, e.g. via the existing drive motor. A new concept was developed with the help of a IEE existing model test rig.
This test rig simulates the behavior of a rolling mill drive system to a large extent. The roll sets and the roll gap behavior are realized by means of electric drives, whereby a roll gap model is calculated in real time on special hardware. The comb rolling gear of the real system is simulated by using a distribution gear and a reversing gear. The design is carried out in such a way that the relevant mechanical natural frequencies and mode shapes correspond to those of the real system.
Several passive and active concepts for damping the self-excited vibration were developed and tested. These investigations showed that it is possible to dampen these vibrations by integrating an active damper in the form of an additional drive on the spindles or on the work roll. The measurements on the test bench prove the suitability of the investigated active damping measures using damping motors on the main spindle or the lower work roll.