Results 251 to 260 of about 3,664,430 (285)

Experimental Characterization of Noise Sources for Duct Acoustics

Journal of Vibration and Acoustics, 1989
Many industrial applications involving the acoustics of ducting or piping systems require an improved description of noise sources, so that a better prediction and evaluation of system performance can be achieved. Some examples are (a) the computer simulation of intake and exhaust muffler performance, (b) the control of pressure pulsation in fluid ...
A. G. Doige, H. S. Alves
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Space-Time Noise Characterization for Underwater Acoustic Communications

OCEANS 2018 MTS/IEEE Charleston, 2018
The performance of an underwater acoustic receiver may not be accurate when the noise at the receiver is assumed to always be white Gaussian, and uncorrelated between elements. In this work, ocean ambient noise is characterized to accurately predict the gain on an array of acoustic sensors.
Afolarin Egbewande, Jean-Francois Bousquet   +1 more
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Acoustic source characterization of simulated subsonic jet noise using spherical harmonics

The Journal of the Acoustical Society of America, 2023
As subsonic jets remain one of the major contributions to aircraft noise emissions, near-field flow simulations should be included in aircraft design at an early stage using quantitatively predicted sound pressure levels and the time-domain signal properties of the noise data.
Christian Dreier, Xenia Vogt, Wolfgang Schröder, Michael Vorländer   +3 more
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On the use of acoustic ambient noise to characterize backscattering strength

The Journal of the Acoustical Society of America, 1997
Strong correlation between acoustic ambient noise and backscattering strength was observed during analysis of data from the acoustic surface reverberation experment (ASREX) [Williams et al., J. Acoust. Soc. Am. 97, 3404 (1995)]. Traditional empirical formulas for acoustic backscattering strength, such as those of Chapman and Harris [R. P. Chapman and J.
Christopher W. Day, Neil J. Williams, Charles L. Monjo, Hien B. Nguyen, Harry A. Deferrari   +4 more
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Characterizing acoustic shocks in high-performance jet aircraft flyover noise

The Journal of the Acoustical Society of America, 2018
Acoustic shocks have been previously documented in high-amplitude jet noise, including both the near and far fields of military jet aircraft. However, previous investigations into the nature and formation of shocks have historically concentrated on stationary, ground run-up measurements, and previous attempts to connect full-scale ground run-up and ...
Brent O, Reichman, Kent L, Gee, Tracianne B, Neilsen, J Micah, Downing, Michael M, James, Alan T, Wall, Sally Anne, McInerny   +6 more
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Acoustic and vibratory characterization of in-room footfall noise: Part 2.

The Journal of the Acoustical Society of America, 2008
Prior to Phase I of this study [ J. Acoust. Soc. Am. 22], existing footfall literature was primarily focused on transmission between spaces, i.e., IIC. This study measured the sound power and vibratory spectra produced by footfalls using both human subjects and standard tapping machines. One tapper had rubber-tipped drop weights and the other had cored
Robert M. Tanen, Jonathan C. Silver, Michelle C. Vigeant, Robert D. Celmer   +3 more
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Statistical Shipping Noise Characterization and Mitigation for Underwater Acoustic Communications

OCEANS 2019 - Marseille, 2019
Achieving high data rate robust communication in shallow and harbour underwater acoustic (UA) environments can be a demanding challenge in the presence of shipping noise. Noise generated from nearby passing ships can lead to impulsive agitations which impair UA communication systems.
Lazar Atanackovic, Ruoyu Zhang, Lutz Lampe, Roee Diamant   +3 more
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Acoustic monitoring and noise source characterization in a hospital ward

The Journal of the Acoustical Society of America
Hospital environmental noise, generated by medical equipment, technological devices, and staff communication, is a significant factor affecting patient recovery. Prolonged exposure to excessive noise levels may cause sleep disturbances and impair postoperative recovery.
Jadwiga E. Hyla, Tadeusz Wszołek, Marcjanna Czapla, Szymon Ruchniewicz   +3 more
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Acoustic Source Characterization for Prediction of Medium Speed Diesel Engine Exhaust Noise

Journal of Vibration and Acoustics, 2013
To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method.
Åbom, M, Hynninen, Antti
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Design and characterization of acoustic porous metasurfaces for noise reduction

2019
An effective passive method to control noise is applying sound absorption materials and structures. Many works have been done to optimize parameters, structures and arrangements of the sound absorption materials to improve absorbing efficiency. In acoustics, metamaterials that possess extraordinary properties not found in nature have been of interest ...
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