11/19/2022 0 Comments Flight attendant sound effects![]() ![]() The results demonstrate that the base frequency of the propellers and their harmonics have the highest noise pressures at the front of the cabin while the other components are high at the rear. Finally, the noise level is studied throughout the cabin. Some other components caused by the unbalanced propellers, and the structural and acoustic resonance are discovered in the noise signal. In addition to the base frequency of the propellers, their harmonics also play major roles in the acoustic signals. The signal decomposition results show that the propellers generate the most significant part of the cabin noise. An attempt is made to recognize the physical sources of the noise components. For the first time, the signal decomposition methods of the Empirical Mode Decomposition (EMD) and Singular Spectrum Analysis (SSA) are implemented to the cabin noise signals. In order to determine the noise characteristics and key contributing factors to the noise, the sound pressure signals are decomposed. Furthermore, the sound pressure signals are acquired at 5 positions within the cabin. To that end, the noise power at the front and rear of the cabin are obtained in the scale of one-third octave-band. The acoustic signals throughout the cabin of a regional turbo-propeller driven airplane were measured during a cruise flight. This study shows that it can be possible to control and reduce in-cabin noise levels, especially due to human activities and a few recommendations are suggested. Discontinuous in-cabin noise levels were observed to reach levels as high as 81-88 dB(A) range. As a general tendency, continuous noise levels were seen to be 60-65 dB(A) prior to takeoff, and 80-85 dB(A) and 75-80 dB(A) during flight and landing, respectively. These noise levels consist of both continuous and discontinuous types. ![]() In this study, in-cabin noise levels were measured during all flight activities in a commercial jet passenger plane. These can be classified into those caused by passenger activities such as conversations and luggage-related rearrangements as well as those caused by flight-crew such as flight attendant-related speaking activities, announcements from pilot and flight attendants, mechanical noises during food/beverage services and flight security demonstrations, and other announcement signals. There are also non-aircraft-originating noise sources in the cabin. Noise levels, which changes according to different motions of aircraft, can be defined as the noise during takeoff and landing and during level flight (cruise). Aircraft interior noise is important, especially in long-term flights, concerning the health, comfort, and psychological wellness of both passengers and flight crew. Air transport is one of the most commonly used mode of transportation and hence passenger comfort is highly desirable. ![]()
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