Tobias Hemsel

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The optimal design of symmetrical Langevin transducers using multiobjective evolutionary algorithms (MOEAs) is studied. The design problem is formulated as a constrained multiobjective optimization problem (MOP) involving continuous design variables (dimensions of the transducer) and discrete design variables (the number of piezoelectric rings and material(More)
A simple pre-stress estimate method of Langevin transducers is studied. The measurement setup consists of a capacitor, an impedance converter and a voltmeter. Based on the piezoelectric equation and the basic circuit theory, the mathematical expression between the pre-stress and the voltage across the capacitor is derived. The pre-stress level can then be(More)
Self-optimizing systems are able to adapt their behavior autonomously according to their current self-determined objectives. Unforeseen influences could lead to dependability-critical behavior of the system. Methods are required which secure self-optimizing systems during operation. These methods to increase the dependability of the system should already be(More)
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