engleski

Two vs. three blade propeller - cockpit noise comparison

The noise generated by propeller efficiently masks other noise sources in GA aircraft and is composed of tonal and broadband components. The former are more dominant than the latter ones and comprise fundamental blade passing frequency along with harmonics that are dependent on number of propeller blades and propeller rotational speed. Cockpit noise arises when propeller noise in the form of pressure pulses enters the cabin through the windshield and excites the interior air volume. While aircraft performance envelope with two vs. three blade propeller can be quite narrow regarding cruise speed vs. faster acceleration and improved climb, interior noise levels and spectrum are expected to differ distinctly. In this paper the contribution of two vs. three blade propeller to overall aircraft interior noise was investigated. Furthermore, spectral properties of interior noise, human preference and influence to speech intelligibility have been analyzed.

propeller; noise; cockpit

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