Einladung zum Vortrag im Kolloquium Technische Kybernetik

 Modeling and Control
of Piezoelectric Tube Actuators
and Dynamic Atomic Force Microscopes

Dipl.-Ing. Johannes Maess
Platform Development Starter Motors
Starter Motors and Generators
Robert Bosch GmbH
Schwieberdingen

    Zeit: Dienstag 2.12. 2008 · 16:00 Uhr
    Ort: V 47.04 · Pfaffenwaldring 47 · Campus Stuttgart-Vaihingen

Abstract

Development of atomic force microscopes is required to achieve the objectives of increased resolution and operating speed. These properties are linked to feedback control of the two mechatronic components at the heart of the microscope, namely the piezoelectric tube actuator and the force sensing microcantilever. Accurate models of both componets are derived by a structural dynamics approach, and the model of the piezoelectric tube actuator is validated by experimental data. Displacement feedback and induced voltage feedback of piezoelectric tube actuators is investigated for trajectory tracking. Controller performance and robustness is evaluated by numerical simulations. A detailed simulator of dynamic atomic force microscopes is implemented to enable simulations of the nonlinear cantilever oscillation under multi-frequency excitation. The analysis is focused on nonlinear oscillation phenomena, e.g. energy transfer due to mode coupling. Furthermore, various operation modes, i.e. higher-harmonics imaging, higher-eigenmode imaging, and Kelvin probe force microscopy, are investigated and evaluated by numerical simulations.

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