Effects of acoustic treatment on the interior noise of a twin-enginepropeller airplane

Beyer, Todd B.; Powell, C. A.; Daniels, E. F.; Pope, L. D.

doi:10.2514/3.45202

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…The cavity resonance due to reverberation in the room is never excited, and the spectra of the incident sound waves are uniform. Because the wave front of the incident waves is close to planar, the intensity of the incident waves can be approximated by the SPL [4]. The TL is calculated by subtracting the acoustic intensity level (IL) of the transmitted waves IL t from the SPL of the incident waves SPL i :…”

Section: B Methodsmentioning

confidence: 99%

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Simple Technique for Precise Measurement of Transmission Loss of Planar Sound Waves

et al. 2010

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A simple technique is proposed to measure the transmission loss through a panel of arbitrary size. The present technique uses two anechoic rooms to simulate the free acoustic field. Different from the conventional methods, the incident angle, the sound pressure distribution, and the spectral distribution of the incident sound waves can be changed arbitrarily. By the calibration experiments, the reasonable capabilities of the prototype facility are confirmed. In the experiment, a panel is installed in between two anechoic rooms. For the sake of simplicity, quasiplanar sound waves are provided in the sound-source room at uniform sound pressure over the panel. The intensity of the transmitted sound waves is measured in the receiving room. The modal analyses and the transmission loss measurements are completed for three different materials: aluminum, honeycomb sandwich, and carbon composite. The results are useful to verify the numerical analyses.

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Section: B Methodsmentioning

confidence: 99%

“…S OUND transmission through a fuselage panel has been studied widely for aerospace applications [1][2][3][4][5][6]. For example, it is a critical issue to minimize the cabin noise when developing a new aircraft with a quiet and comfortable cabin.…”

Section: Introductionmentioning

confidence: 99%

Simple Technique for Precise Measurement of Transmission Loss of Planar Sound Waves

et al. 2010

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“…Beyer et al 25 described study of the cabin acoustics of a Fairchild Merlin IVC twin-engine propeller airplane. The sound field was measured at six locations inside both an untreated "green" airplane and a completely finished airplane.…”

Section: Noise Controlmentioning

confidence: 99%

Low-frequency interior noise in prop-driven aircrafts: Sources and control methodologies

Ommi

Azimi

2017

Noise & Vibration Worldwide

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Nowadays, noise has turned into one of the most important among the environmental factors on which industry sets down a big part of its efforts and concerns. The recognition of noise as a serious health hazard is a development of modern times. Too much noise obviously impairs our physical and mental existence and therefore it is reasonable to pursue Technology Assessment concerning noisy technologies. The conflicts of interest associated with noise that arise from the operation of airports are well known. Propeller noise is most dominant at low frequencies (below 500 Hz) where traditional passive treatments have only little effect. The many factors contributing to the sound field inside propeller aircraft have led to extensive research directed toward identifying and improving techniques for interior noise reduction.

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Constructive actions for decrease in acoustic loading in the assembly and protective block 81ks

Попов¹,

Igolkin

2018

Journal of Dynamics and Vibroacoustics

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On the basis of the experimental works which are carried out in TsAGI laboratories necessary parameters of coefficients of mechanical losses, absorption coefficients, coefficients of distribution and sound insulation for composite samples with drawing on their surfaces of different sound-absorbing materials which have allowed to reduce loading on adaptable spacecraft to the total mean square level of the acoustic pressure which is not exceeding 140,6 dB are received. In work the rated scheme of research of decrease in acoustic loadings is given and comparison of theoretical and experimental data is given. Results of rated pilot studies have been confirmed with design tests of launch vehicle "Soyz-2".

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Effects of acoustic treatment on the interior noise of a twin-enginepropeller airplane

Cited by 6 publications

References 13 publications

Simple Technique for Precise Measurement of Transmission Loss of Planar Sound Waves

Simple Technique for Precise Measurement of Transmission Loss of Planar Sound Waves

Low-frequency interior noise in prop-driven aircrafts: Sources and control methodologies

Constructive actions for decrease in acoustic loading in the assembly and protective block 81ks

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