Tests of anechoic chamber for aeroacoustics investigations

Palchikovskiy, Vadim; Bersenev, Yu.V.; Makashov, S. Yu.; Belyaev, I. V.; Korin, I.; Sorokin, E. V.; Khramtsov, I. V.; Kustov, Oleg

doi:10.1063/1.4964058

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Studies of a single-stream jet were carried out in an anechoic chamber in PNRPU [29][30][31]. The authors used a single-stream jet without cocurrent flow at a speed of 0.5 M, created using two series-connected fans, each with a power of 45 kW.…”

Section: Experimental Study Of Jet Noise With Standard and Chevron Nomentioning

confidence: 99%

Study of the Position of Sound Sources in a Turbulent Jet Using Nozzles of Different Configurations

Ershov

Khramtsov

2020

MATEC Web Conf.

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The aim of this work is to study the position of dominant sound sources in a small-scale turbulent jet using the beamforming method. Two nozzles of equivalent diameter and different geometric configurations (conical and chevron) were used to create different initial conditions for the outflow. Based on the analysis of the results obtained, it can be concluded that they are in good agreement with the well-known concepts of the physics of noise generation processes by turbulent jets: higher-frequency sources are generated by smaller-scale turbulent structures located closer to the nozzle edge, which is confirmed by the localization of high-frequency noise sources also closer to the nozzle edge. The chevron nozzles loosen the initial section of the jet, making it less short and thereby facilitating a faster displacement of noise sources to the nozzle edge, as seen when comparing localization maps for conical and chevron nozzles at the same frequencies. The results of localization were compared with the data obtained by other researchers. The results obtained were found to provide confidence in the use of acoustic beamforming to measure the location of the jet noise source with accuracy similar to other methods that have been used in the past.

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Section: Experimental Study Of Jet Noise With Standard and Chevron Nomentioning

confidence: 99%

Study of the Position of Sound Sources in a Turbulent Jet Using Nozzles of Different Configurations

Ershov

Khramtsov

2020

MATEC Web Conf.

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“…The experiments on localization of two calibrating sound sources (beepers) were performed by 54-channel microphone array B&K in the acoustic anechoic chamber at PNRPU [7,8]. The tone frequencies of calibrating sound sources were accurately known and equal to 2400 and 2700 Hz respectively.…”

Section: Comparison Of Beamforming Algorithms Based On Natural Experimentioning

confidence: 99%

Comparison of beamforming algorithms based on localization of calibrating sound sources and air jet noise

Ershov¹,

Palchikovskiy²

2018

IJET

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The paper considers study of beamforming algorithms for localization of noise sources. The mathematical formulations are briefly described for the following algorithms: Delay-and-Sum Beamforming, Cross-spectral Beamforming, Deconvolution Approach for the Mapping of Acoustic Sources (DAMAS). Based on the mentioned algorithms the program codes were developed. Operability of the program codes was tested on virtual localization of the point sources. All algorithms demonstrated good ability to distinguish these sources at different frequencies at their close position relative to each other. Initially, experiments were based on localization of calibrating static sound sources (beepers) using Bruel & Kjaer 54-microphone array. The measured data were processed both in the Bruel & Kjaer software and in the developed software. For static point sources, all algorithms have shown good work quality. The experiments were also carried out for the localization of noise sources in a turbulent air jet. In this case, the best results were demonstrated by Cross-Spectral Beamforming algorithm.

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“…The acoustic characteristics of products are a key issue in the assessment of their performances, especially for controlling their noises [1]. To meet contemporary and prospective noise standards, environmental protection has become more and more strict on the corresponding noise control requirements [2], especially in aerospace [3][4][5], automobile [6,7], and other industry fields. It means that the requirement of the accuracy of the acoustic characteristics in noise measurement is stricter.…”

Section: Introductionmentioning

confidence: 99%

Study on the curve error of acoustic transmission path in anechoic chamber

Meng²,

Li³

2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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Moving the sound transmission device along the sound transmission path (wire rope) point by point is a common measurement method for the acoustic field characterization in an anechoic chamber. In the actual testing process, due to the influence of the weight of the sound transmission device and the wire rope, the sound transmission path will change from an ideal straight line to a curve, resulting in the measurement error for acoustic characteristics. In this paper, the catenary theoretical model is established to describe the sagging wire rope. To consider the gravity of the sound device, the finite element method is used to simulate the sound transmission path. The experimental validation shows that our model can better express the deviation of the sound transmission path concerning gravity. It is of great significance to improve the accuracy and reliability of measuring the acoustic characteristics in an anechoic chamber.

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Tests of anechoic chamber for aeroacoustics investigations

Cited by 7 publications

References 3 publications

Study of the Position of Sound Sources in a Turbulent Jet Using Nozzles of Different Configurations

Study of the Position of Sound Sources in a Turbulent Jet Using Nozzles of Different Configurations

Comparison of beamforming algorithms based on localization of calibrating sound sources and air jet noise

Study on the curve error of acoustic transmission path in anechoic chamber

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