Showing papers by "Oliver Sawodny published in 2004"

Crane or excavator for handling a cable-suspended load provided with optimised motion guidance

Abstract: The invention relates to a crane or excavator for handling a cable-suspended load (3) comprising a rotation system for rotating the crane or excavator, a rocker system (7) for lifting or tilting a crane arm (5) and a lifting system for lifting or lowering the cable-suspended load (3) which is provided with a drive system. According to said invention, the crane or excavator comprises a continuous control system (31) whose output values are directly or indirectly used for input values for adjusting the position or speed of the crane or excavator, the control guiding values being generated in the continuous control system (31) in such a way that the amplitude of pendulum swing of the load is minimised.

Optimal flatness based control for heating processes in the glass industry

Abstract: This work deals with a heat transfer process and an optimal control of an inhomogeneous partial differential equation describing this process. One considers a glass feeder gate, which is present at many glass manufacturers. The use of the offered study is a development of an optimal feedforward control for dynamic behavior of this heating process. A mathematical model of the glass feeder gate is presented by a nonlinear distributed parameter system. The control design is based on approaches of a flatness description of dynamic systems and a parameterization of a reference trajectory for the optimization of the dynamical behaviour. The control strategy must be sufficient for a number of requirements to process (e.g. output temperature at the end of the feeder gate) and must provide optimum quality criteria (consumption of power). Some simulation results are included and demonstrate the efficiency of the control.

Modeling and control strategies for heating processes in the glass industry

Abstract: In glass industry, the energy for the manufacturing process plays an important role for the productivity of the plant. Till now, the process is mainly controlled based on experience of the operators. In the paper a method is presented for deriving optimized feedforward control strategies resulting in reference temperature profiles for the plant control. Therefore a dynamic model based on partial differential equation as an approximation for the glass feeder gate is derived. Measurements show a good agreement to the simulation model behavior. Next step is the development of a feedforward control based on an approach via a flat system description in combination with optimization techniques. The obtained result was an advantageous temperature profile, which leads to a reduction of gas consumption at the plant of approximately 6 to 8 %.

Kran oder bagger zum umschlagen von einer an einem lastseil hängenden last mit optimierter bewegungsführung

Abstract: Die Erfindung betrifft einen Kran oder Bagger zum Umschlagen von einer an einem Lastseil hangenden Last (3) mit einem Drehwerk zum Drehen des Krans oder Baggers, einem Wippwerk (7) zum Aufrichten bzw. Neigen eines Auslegers (5) und einem Hubwerk zum Heben bzw. Senken der an dem Seil aufgehangten Last (3) mit einem Antriebssystem. Erfindungsgemass weist der Kran oder Bagger eine Bahnsteuerung (31) auf, deren Ausgangsgrossen direkt oder indirekt als Eingangsgrossen in die Regelung fur die Position bzw. die Geschwindigkeit des Krans oder Baggers eingehen, wobei die Fuhrungsgrossen fur die Steuerung in der Bahnsteuerung (31) so generiert werden, dass sich eine Lastbewegung mit minimierten Pendelausschlagen ergibt.