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Negative capacitance shunt damping system with optimized characteristics for use with piezoelectric transducers

Pohl, Martin (2014) Negative capacitance shunt damping system with optimized characteristics for use with piezoelectric transducers. In: SPIE Conference on Smart Structures NDE 2014. SPIE 2014, 10.-13. März 2014, San Diego, USA.

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Abstract

For ecologic sustainability and decreasing reserves of fossile energy sources, fuel efficiency is a major concern especially for passenger aircraft. Therefore, lightweight structures made from carbon fiber plastics offer great potential. But when used for panel-like structures, they have the disadvantage of lower damping and coincidence frequencies compared to conventional differential metal constructions. Both aspects lead to an increased vibration level and by this a higher noise radiation. Because of this, special noise and vibration treatment is needed to ensure passenger cabin comfort. Besides passive damping and active structural acoustic control (ASAC), piezoelectric shunt damping is investigated. Due to its broadband performance, the negative capacitance shunt can be used for multimode systems with varying eigenfrequencies. These shunts are usually built with operational amplifiers and passive components as resistors and capacitors. This setup is sufficient for laboratory tests at low excitation levels. In fact, it is not capable of accessing the full voltage amplitude of common piezoelectric transducers, because most operational amplifiers only deliver $\pm15V$ maximum output voltage. Therefore an improved setup is presented in this paper, which addresses the specific voltage requirements of a common piezoelectric transducer to achieve best performance. It comprises a tailored power source and an appropriate concept for the negative capacitance shunt hardware. This new hardware only uses standard operational amplifiers together with a high voltage power amplifier to cover the whole operating range of a piezoelectric transducer. A demonstrator board is developed and experimentally investigated at a test structure. Finally, the results are compared to a conventional setup.

Item URL in elib:https://elib.dlr.de/91207/
Document Type:Conference or Workshop Item (Speech)
Title:Negative capacitance shunt damping system with optimized characteristics for use with piezoelectric transducers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:March 2014
Journal or Publication Title:SPIE Conference on Smart Structures NDE 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:piezoelectric shunt damping, negative capacitance, vibration damping
Event Title:SPIE 2014
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:10.-13. März 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Braunschweig