Mr. Andreas Hohl Profile

Andreas Hohl

at Leibniz Univ Hannover

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Proceedings Article | 7 April 2009 Paper

Active and semiactive vibration damping of turbine blades with piezoceramics

A. Hohl, M. Neubauer, S. Schwarzendahl, L. Panning, J. Wallaschek

Proceedings Volume 7288, 72881H (2009) https://doi.org/10.1117/12.815800

KEYWORDS: Actuators, Capacitance, Neodymium, Finite element methods, Manufacturing, Electrodes, Resistance, Sensors, Lawrencium, Differential equations

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In this paper the damping capability of piezoelectric shunting is analysed for bladings. Beside the broadly used inductance-resistance networks, negative capacitance techniques are considered. For the validation of the theoretic results, a test rig with a model of a bladed disk with eight blades has been manufactured and equipped with two collocated piezoceramics at each blade. One of the piezoceramics is used as an actuator for an engine order excitation. The second piezoceramics is used for shunt damping. The experimental results of the test rig are compared with numerical results. Therefore, the structure and the piezoceramics are modeled in a finite element program. The modal excitation forces of the piezoelectric actuators are derived for all modes of the structure by a static analysis with a specific voltage applied to the piezoceramics. In addition, using the modal displacement field of the static analysis the modal excitation forces can be calculated. Furthermore, the number of degrees of freedom of the system is reduced by a modal reduction technique. The electrical behavior of the piezoceramics connected to each blade is modeled by one degree of freedom and coupled with the mechanical system described above. The different damping concepts are compared with respect of their effectiveness.

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