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Wednesday, July 10 • 10:50 - 11:10
REDESIGNING LANDING GEAR BRACES FOR AEROACOUSTICS

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In this paper, various geometric modifications to landing gear side braces are assessed in terms of their impacts on noise generation. Far-field noise levels are quantified conducting microphone measurements in the University of Toronto's open-jet anechoic wind tunnel. The baseline brace geometry considered was a high-fidelity replica of the side brace designs used in current, twin-aisle, commercial aircraft, and had an I-beam shape. Different combinations of leading- and trailing-edge elements as well as I-beam cavity plugs were added to this baseline shape to evaluate modifications that can reduce noise. The results showed that adding only a leading-edge element on the I-beam resulted in a broadband noise increase in the mid-frequency range, whereas plugging the I-beam cavities in presence of these leading-edge elements brought the noise output of the model back to the levels of the baseline I-beam shape. Installing only a trailing-edge element to the I-beam or filling the cavity while having a trailing-edge element did not induce any significant variations in the noise output compared to the baseline design. Although installing a semi-circular leading-edge and a triangular trailing-edge element along with cavity plugs was a configuration closest to an airfoil shape, it generated a low-frequency broadband noise increase. Opening cut-outs on the I-beam shape of a brace brings weight saving benefits and consequently can be deemed advantageous by aircraft designers. Therefore, noise impacts of rectangular cut-outs on the I-beam frontal area have also been examined. The particular cut-outs studied in this investigation did not show a strong effect on the noise levels of the I-beam. Lastly, a cylindrical brace with an oval cross-section was tested and shown to produce higher noise levels across all frequencies than the baseline I-beam structure. These unexpected noise trends emphasize the need for a better understanding of the flow physics for further elucidation.

Moderators
JK

Jim Kok

Dr., University of Twente
RM

Ricardo Musafir

Prof, Federal University of Rio de Janeiro

Authors

Wednesday July 10, 2019 10:50 - 11:10 EDT
Outremont 5
  T03 Aero… aircrft noise & vibr., RS02 Aviation & flow noise