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- W2334556845 abstract "Advanced turboprop technology allows propeller aircraft to reach cruise speeds comparable to current jet aircraft yet with considerable fuel savings. Due to the higher blade loading and higher tip speed of these propellers, noise levels of up to 150 dB are expected on the outside of the fuselage in the propeller plane. In this study the transmissibility of triple pane windows, designed to provide 69 dB noise transmission loss at the blade propeller frequency of 164 Hz, was experimentally investigated using insertion loss and three-dimensional intensity techniques. A modal analysis on the outer window panes was conducted to determine pane modal frequencies. Coherence and phase relation of outer panes and window frame were established to obtain double/triple wall and lump mass resonance frequencies. Double/triple wall resonances were found to degrade the transmission loss of the two windows. It was shown that, at the blade passage frequency and the first two overtones, the combinations of window plus scratch shield provide less transmission loss than the average transmission loss of the treated fuselage. Strong disagreement was obtained between the experimental transmission loss of this investigation and the theoretical predictions from another study." @default.
- W2334556845 created "2016-06-24" @default.
- W2334556845 creator A5011322376 @default.
- W2334556845 date "1987-08-17" @default.
- W2334556845 modified "2023-09-26" @default.
- W2334556845 title "Acoustic transmissibility of advanced turboprop aircraft windows" @default.
- W2334556845 doi "https://doi.org/10.2514/6.1987-2662" @default.
- W2334556845 hasPublicationYear "1987" @default.
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