J.C. Simonich

A feasibility study was performed to investigate actuator technology which is relevant for a particular application of active noise control for gas turbine stator vanes. This study investigated many different classes of actuators and ranked them on the order of applicability to the current application. The most difficult requirements the actuators had to meet were high frequency response (> 1 kHz), large amplitude deflections (±0.010 inches) and a thin profile (< 0.25 inch). Based on this assessment, piezoelectric type actuators were selected as the most appropriate actuator class for this application. Specifically, Rainbows (a new class of high performance piezoelectric actuators), and unimorphs (a ceramic/metal composite) appeared best suited to the requirements. To measure performance and gain working knowledge of using such actuators, a bench top experimental study was conducted. The performance of a variety of different actuators was examined, including flextensional actuators, miniature speakers, unimorphs and Rainbows. The actuators performance including displacement/frequency response and phase characteristics was measured using opticalsensors. Physical limitations of actuator operationwere also examined. This report includes the first known, high displacement, dynamic data obtained for Rainbow actuators. A peak to peak displacement at resonance of 0.013 inches was achieved with a 1.25 inch diameter,0.015 inch thick Rainbow actuator. For comparison, a 0.010 inch thick unimorph actuator with adiameter of 2 inches was able to achieve a displacement of 0.018 inches at resonance. The study concludes that although no actuator currently exists for this application, it is likely that a suitable actuator for active noise control in gas turbine engines can be developed with state-of-the-art materials and processing.

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.445-453; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995