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Experimental and numerical study of high-intensity sound in the cavity between rotator and stator of high- pressure compressor Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-02-26 Zhao Fengtong, Cui Bo, Yang Mingsui, Jiang MX, Sha YD, Guo Xiaopeng
An experiment is conducted in a multistage high-pressure compressor to investigate noise and rotor blade vibration. When vibration with high amplitude occurs in the rotor blade, high-intensity sound occurs within the compressor. The amplitude of noise inside the compressor varies with the amplitude of blade vibration, and the variation laws are consistent. Therefore, an annular disk cavity model, the
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A physics merged deep neural network-based prediction method for jet turbulent mixing noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-01-25 Baohong Bai, Yingzhe Zhang, Xiaodong Li, Junhui Gao
Turbulent mixing noise is a vital component of jet noise, and its rapid, accurate prediction has always been persistently pursued. Recent advancement in machine learning has been applied to jet noise prediction. However, these applications are pure curve fitting and lack physical constraints. In this study, a physics-merged deep neural network (PMNN)-based prediction method was developed for turbulent
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Effect of sawtooth trailing edge serrations on the reductions of airfoil broadband noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-01-20 Sushil Kumar Singh, Girija Shankar, Aadit Narayanmurthy, Kabilan Baskaran, Subramania Narayanan
The present paper examines the use of modified dual-wavelength sawtooth serrations introduced at the trailing edge (TE) of a National Advisory Committee for Aeronautics (NACA) 65 (12)-10 airfoil as a passive means for the control of airfoil broadband noise. The studies are conducted for different parameters such as serration wavelengths (λ), serration amplitudes (h) as well as (hꞌ) modified amplitude
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Numerical and experimental investigation of aerodynamic noise from a cooling fan in a turbulent flow Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-01-10 Hassan Lakzayi, Zeinab Pouransari, MohammadReza KargarAbjahan
The investigation into aerodynamic noise arising from rotating surfaces bears significant practical implications. Among these, engine cooling fans have persistently been identified as primary contributors to vehicle noise. This study aims to provide a deeper comprehension of the complex unsteady flow dynamics surrounding an automotive cooling fan and its consequential impact on the generation of aerodynamic
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A comparison of in situ and impedance eduction experimental techniques for acoustic liners with grazing flow and high sound pressure level Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-01-06 Lucas A Bonomo, Nicolas T Quintino, André M N Spillere, Paul B Murray, Julio A Cordioli
Several techniques are available to characterize acoustic liners when subject to grazing flow and high sound pressure level (SPL). Although the in situ technique started as the primary experimental procedure, impedance eduction techniques have gained popularity over the past years. However, there is a lack of comparison between these group of methods, especially at conditions typically found in turbofan
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On the balance between the tonal and broadband noise of isolated propellers Int. J. Aeroacoust. (IF 1.0) Pub Date : 2024-01-05 Deepak C Akiwate, Phillip Joseph, Anthony Parry, Chaitanya Paruchuri
This study presents a predominantly numerical and theoretical investigation into the balance of tonal and broadband noise due to an isolated propeller in uniform motion. The predicted trends in the balance between tonal and broadband noise radiation with varying blade number and speed of rotation is supported by preliminary experimental measurements. Here, we assume that the dominant noise generation
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Simulations of multi-rotor interaction noise at hovering & forward flight conditions Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-20 Samuel O Afari, Reda R Mankbadi
A high-fidelity simulation of two in-line counter-rotating propellers in hover, and in forward flight conditions are performed. Near field flow and acoustic properties were resolved using Hybrid LE...
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Investigations of thickness effects on the acoustic characteristics of symmetric and asymmetric airfoils Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-17 Sujit Kumar, Priyanshu Mishra, S Narayanan
The present paper provides a detailed acoustic characterization of symmetric and asymmetric NACA airfoils for various thickness ratios to determine the best thickness ratio and geometry which provi...
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Playing flute without lips? Tones of music lost in time:An investigation of the indigenous Bastar flutes of India Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-11 Ashish Karn, Ritvik Anand, Aditya Kataria, Ramesh Kumar Donga, Naman Agarwal, Varun Pratap Singh
The physics of music has been well studied and has provided the basis on which musical instruments are made, studied and characterized. Significant research has been conducted on the different kind...
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Angle-of-attack and mach number effects on the aeroacoustics of an SD7003 airfoil at Reynolds number 60,000 Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-10 Dhanush Vittal-Shenoy, Romain Gojon, Thierry Jardin, Marc C. Jacob
The aeroacoustics of an SD7003 airfoil at Reynolds number 60,000 is investigated using Large Eddy Simulation. Five simulations are performed to study the effects of angle-of-attack and Mach number ...
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Numerical and experimental analysis of the influence of solidity on rotor aeroacoustics at low Reynolds numbers Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-09 Thierry Jardin, Romain Gojon, Nicolas Doué, Hélène Parisot-Dupuis
We compare medium and high fidelity numerical simulations to experiments conducted on low Reynolds number rotors typical of small scale Unmanned Aircraft Systems (UAS). We first show that these num...
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Aeroacoustic characteristics of supersonic offset jets Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-03 Harinath Reddy Nakkala, K Srinivasan
The offset jet configuration is one where the jet is discharged at some distance from a solid surface. Although the geometric configuration may look simple, the flow may involve several complexitie...
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Acoustic optimization design of porous materials on sandwich panel under flow-induced vibration Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-03 Ye Li, Xinbiao Xiao, Yumei Zhang, Zhao Tang, Aipeng Pan
In this study, porous sound-absorbing materials used as a lining in double-panel structure applications (such as high-speed train body structures) to limit flow-induced vibration interior noise wer...
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The acoustic performance of a dual Helmholtz resonators system in the presence of a grazing flow Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-02 Rong Xue, Cheuk Ming Mak, Dizi Wu, Kuen Wai Ma
Helmholtz resonators (HR) are widely used in aero-engine systems for noise reduction. By connecting a pair of HRs in series (neck-cavity-neck-cavity), a dual HRs system is formed. This study invest...
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Hydrodynamic sources of the vortex sound in a two-dimensional shear layer Int. J. Aeroacoust. (IF 1.0) Pub Date : 2023-01-02 Yongle Du, Hangwen Yu, Yanchen Liu, Dangguo Yang
Development of advanced noise reduction devices requires an in-depth understanding of two fundamental questions: what are the true noise sources and how are the acoustic radiations generated. An ac...
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Experimental investigation of the laminar boundary layer vortex-shedding noise by an airfoil within a closed-vein wind tunnel Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-12-06 Stéphane Redonnet, Thomas G Schmidt
This study concerns the experimental characterization of trailing edge noise, the understanding of which is crucial for mitigating acoustic pollution across major industries. An aeroacoustic experi...
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Aerodynamic noise characteristics of non-circular cylinders in subcritical flow regime Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-11-15 Arun MG, Sarvoththama Jothi TJ
The present study experimentally investigates the aerodynamic noise from the flow around cylinders of square and equilateral triangle cross-sections at different angles of incidence (α). The cylind...
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Data-driven neural networks for source localization and reconstruction using a planar array Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-11-11 Sai Manikanta Kaja, Srinath Srinivasan, S. K. Chaitanya, K. Srinivasan
This study uses specialized deep neural networks comprising dense and convolutional neural networks to localize noise sources and reconstruct acoustic data on a reconstruction plane. The networks a...
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Numerical study on the noise propagation characteristics of rotor in non-uniform downwash flowfield Based on Linearized Euler Equations Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-11-09 Tao Yang, Xi Chen, Qijun Zhao, Guoqing Zhao
To study the influence of non-uniform flowfield on the propagation characteristics of helicopter rotor noise, a Hybrid Computational Aeroacoustics (HCAA) method is developed. The acoustic source re...
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Reduction of noise generated by cylinder-airfoil interaction using grooved structures on the upstream cylinder Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-10-29 Chengchun Zhang, Xiaowei Sun, Tianyu Du, Chun Shen, Zhengwu Chen, Dong Liang, Jiale Zhao, Yingchao Zhang
The cylinder-airfoil interaction noise can be reduced by changing the shape of the leading edge of the downstream airfoil. Generally, this way not only can reduce the interaction noise at middle an...
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Acoustic energy balances for sound radiated from duct exit with mean flow Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-09-17 Sjoerd W Rienstra
An old model problem for the exchange of energy between sound field and mean flow by vortex shedding has been worked out in numerical detail. The analytically exact solution of the problem of refle...
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Extension of the concept of Ffowcs-Williams and Hawkings type wave extrapolation to non-trivial flow effects and exterior surfaces Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-09-01 Jan Werner Delfs, Michael Mößner, Stanislav Proskurov, Roland Ewert
In appreciation of Ffowcs-Williams and Hawkings’ seminal contribution on describing the sound radiation from moving objects, this article discusses a concept of taking into account local non-trivia...
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Acoustic transmission loss and noise from Kevlar wind tunnel walls Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-07-11 Stewart Glegg, Máté Szőke, William Devenport
In this paper we will develop a model for the acoustic transmission loss and self-noise generated by a Kevlar wind tunnel wall. It is shown that the porosity of the fabric is the most important con...
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Computationally efficient, frequency-domain quadrupole corrections for the Ffowcs Williams and Hawkings equation Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-07-05 Tomoaki Ikeda, Kazuomi Yamamoto
In the present article, frequency-domain formulations of quadrupole corrections are derived in a computationally efficient form for the Ffowcs Williams and Hawkings (FW-H) equation with permeable c...
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Airframe noise predictions using the Ffowcs Williams-Hawkings equation Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-07-04 David P Lockard
This paper considers potential sources of error when using the Ffowcs Williams-Hawkings equation to make predictions of airframe noise, which entails a relatively low-speed, uniform incoming flow e...
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Acoustic versus aerodynamic installation effects on a generic propeller-driven flying architecture Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-07-01 Michel Roger, Daniel Acevedo-Giraldo, Marc C Jacob
The present work addresses the combined aerodynamic and acoustic installation effects observed as a subsonic propeller is partly crossing the near-wake of a wing. Only the tonal noise at multiples ...
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Challenges and opportunities for low noise electric aircraft Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-28 Eric Greenwood, Kenneth S Brentner, Robert F Rau, II, Ze Feng Ted Gan
A new class of electric aircraft is being developed to transport people and goods as a part of the urban and regional transportation infrastructure. To gain public acceptance of these operations, t...
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Sound generated by axisymmetric non-plane entropy waves passing through flow contractions Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-22 Dong Yang, Juan Guzmán-Iñigo, Aimee S. Morgans
For a single-component perfect gas, entropy perturbations are associated with the difference between the overall density fluctuation and that coming from the acoustic perturbation. Entropy perturbations can generate sound when accelerated/decelerated by a non-uniform flow and this is highly relevant to thermoacoustic instabilities for gas turbines and rocket engines, and to noise emission for aero-engines
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Jet noise sources for chevron nozzles in under-expanded condition Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-21 Hasan Kamliya Jawahar, Stefano Meloni, Roberto Camussi
Imperfectly expanded jet flows are known to have additional noise sources known as Screech and broadband shock-associated noise. They are generated by the interaction between the instability waves that propagate from the lip of the nozzle and the shock cell structures. In this study, thorough experimental investigations were carried out on chevron nozzles to assess the importance of chevron parameters
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Leveraging large eddy simulations to assess noise source imaging of a controlled supersonic jet Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-23 Chitrarth Prasad, Scott Hromisin, Philip J Morris
Noise source imaging based on phased array measurements is an essential tool in the aeroacoustic analysis of new nozzle designs, especially at full-scale. This investigation aims to assess the capa...
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Role of nozzle-exit boundary layer in producing jet noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-15 Aharon Z Karon, Krishan K Ahuja
Often the measurements from different jet noise studies, which are thought to have been acquired at or corrected to identical jet conditions, do not match when compared to each other. This study looks at the nozzle-exit boundary layer as a possible factor for these differences. The nozzle-exit boundary layer state can easily be changed depending on the design of the jet-facility or the nozzle. To this
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Professor John Eirwyn Ffowcs Williams FREng: Engineer, educator, researcher and entrepreneur, Cambridge Professor and Master of Emmanuel College 25 May 1935–12 December 2020 Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-13 Ann P Dowling
I first met Shôn in October 1973. I had just started Part III of the Cambridge Mathematical Tripos – a post-graduate course that was retrospectively awarded a Masters’ Degree in Mathematics. After a summer job working with Ted Broadbent on aircraft noise at the Royal Aircraft Establishment in Farnborough, I had decided do a PhD in Aeroacoustics. I asked Sir James Lighthill for advice and he told me
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Ffowcs Williams – Hawkings analogy for near-field acoustic sources analysis Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-12 Alexander Karakulev, Tatiana Kozubskaya, Gleb Plaksin, Ivan Sofronov
The paper expands the scope of applying the Ffowcs Williams – Hawkings integration method. We propose using the acoustic field generated from time-dependent data stored on the FW-H control surface as the same common field for computational acoustic beamforming and dynamic mode decomposition methods to analyze the aerodynamic noise sources. We exemplify that it leads to obtaining mutually consistent
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Self active cancellation of fan noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-10 Christopher R Fuller
IReduction of fan noise is an important problem in the successful deployment of drones and UAV's. This paper considers a new approach to reducing fan and propeller noise based upon micro vibrations of the propeller blades around their axis of support. Experimental testing was carried out on a five bladed fan arrangement. The micro fan blade vibrations are induced with a pitch link actuator arrangement
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Systematic validation of the PAAShA shielding prediction method Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-09 Russell H Thomas, Yueping Guo
Based on classical diffraction theories with modifications and extensions in analytical formulations and numerical implementations, a new code has been developed at NASA for the prediction of aircraft noise shielding, named as Propulsion Airframe Aeroacoustic Shielding Attenuation (PAAShA). The code is developed primarily for aircraft system noise predictions, although it may also be useable in other
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Subsonic jet noise source location as a function of nozzle exit boundary layer Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-06-08 Nick P Breen, Krish K Ahuja
Over the years, there have been numerous studies on determining subsonic jet noise source locations, typically plotted as Strouhal number as a function of distance from the nozzle exit. A comparison of the results of various studies yields a spread of about two nozzle diameters in measured source location. This work examines how boundary layer thickness, which can vary from nozzle to nozzle, could
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Investigation on aerodynamic noise generated from the simplified high-speed train leading cars Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-05-17 Chaowei Li, Jianyue Zhu, Zhiwei Hu, Zhenyu Lei, Yingmou Zhu
The aerodynamic noise behavior of flow passing the simplified leading car and nose car scale models of a high-speed train is investigated through the vortex sound theory and acoustic analogy approach. The unsteady flow developed around the geometries is solved numerically and the data are applied to study the near-field quadrupole sound source and calculate the far-field noise radiated. It is found
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Effect of 2D ice accretion on turbulent boundary layer and trailing-edge noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-05-13 Hyunjune Gill, Seongkyu Lee
Trailing-edge noise is known to be sensitive to airfoil shapes, and ice accretion is one cause of an airfoil shape deformation. This paper investigates how trailing-edge noise is affected by the airfoil shape deformation due to ice accretion. The formation of ice-induced flow separation and the development of a turbulent boundary layer are analyzed to understand the correlation between the altered
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A study on an integrated aero-vibro-acoustic analysis procedure for a small-scale supersonic jet and surrounding thin plates Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-05-12 Hyunshik Joo, Taeyoung Park, Seung-Hoon Kang, Sangjoon Shin, Won-Suk Ohm
The goal of this paper is to examine the computational approaches for predicting both of the overall sound pressure level (OASPL) at a few locations and acceleration power spectral density (APSD) of surrounding thin plates due to the aero-acoustic pressure generated by a cold jet with M = 1.8. First, computational fluid dynamics (CFD), particularly delayed detached eddy simulation, are applied to predict
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Advanced analysis of fan noise measurements supported by theoretical source models Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-25 Lukas Klähn, Antoine Moreau, Luciano Caldas, Robert Jaron, Ulf Tapken
With the objective to improve the understanding of the dominant fan noise source mechanisms, a comprehensive experimental study was conducted at a low speed fan test rig. The aerodynamic fan map as well as the acoustic characteristics of the fan was measured for a new blade integrated disk (Blisk) rotor with systematic variation of the shaft speed and throttling. The interpretation of the results is
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Aerodynamic noise from long circular and non-circular cylinders using large eddy simulations Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-23 Joemon Jacob, Subrata Kumar Bhattacharya
Flow-induced aerodynamic noise from four cylindrical shapes of infinite length at a low subcritical flow regime is studied using Large Eddy Simulation (LES) and acoustic analogy. Numerical simulations are performed for short-span (length to diameter ratio of 3) cylinders, and a sound correction method based on equivalent/spatial coherence length has been applied to estimate noise from long-span cylinders
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Flow-noise characteristics of turbocharger compressors with rotational balance cuttings Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-22 Sang Hyun Kim, Tae Seon Park
To correct the balance of the rotating assembly of a turbocharger, some parts of the compressor wheel are removed by cutting. A numerical investigation of the turbulent flows and flow noises produced by compressor wheels modified with such cutting parts was performed by a turbulence model and detached-eddy simulations. For the 6-cutting case, 0, 2, 4, and 6 circular cuttings and two additional—rectangular
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An improved algorithm for liner impedance eduction in low signal-to-noise ratio flow duct Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-21 Penglin Zhang, Cheng Yang, Yu Huang
The impedance eduction technique is widely used by the aeroacoustics community to obtain liner property in a flow duct. However, the obtained impedance is often found to be discontinuous in the frequency domain which violates theoretical liner models. The low signal-to-noise ratio (SNR, in dB) is one factor leading to this unexpected result. To overcome this, a weighting coefficient, represented by
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A fast 3D-MUSIC method for near-field sound source localization based on the bat algorithm Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-21 C Yang, LL Sun, H Guo, YS Wang, Y Shao
To improve the computation and real-time performances of the multiple signal classification (MUSIC) algorithm in 3D space, a fast sound source localization method based on the bat algorithm (BA) and the 3D-MUSIC, called BA-based 3D-MUSIC algorithm (3D-BMUSIC), is presented in this paper. 3D-BMUSIC greatly reduces the computation load by replacing the regular grid search with the BA. First, the near-field
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Corrigendum to The effect of the convective momentum transfer on the acoustic boundary condition of perforated liners with grazing mean flow Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-04-12
Schulz A, Ronneberger D, Weng C, et al. The effect of the convective momentum transfer on the acoustic boundary condition of perforated liners with grazing mean flow. Int J Aeroacoust 2021;20(5-7):737-772. doi:10.1177/1475472X211023842
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Noise shielding of a deflected flap for comparing numerical predictions with flyover experiments Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-03-24 Michael Mößner, Jan W Delfs, Michael Pott-Pollenske
Comparing acoustic simulations against experimental data is an essential step in order to prove the correctness of numerical tools. This can be done with wind tunnel experiments where the environmental conditions can be adjusted very accurately. Ultimately, the tools must be capable of predicting real-word scenarios like aircraft flyovers. However, obtaining precise data from flyover experiments is
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Computational aeroacoustics of aerofoil leading edge noise using the volume penalization-based immersed boundary methods Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-03-04 Wei Ying, Ryu Fattah, Sinforiano Cantos, Siyang Zhong, Tatiana Kozubskaya
Broadband noise due to the turbulence-aerofoil interaction, which is also called the leading edge noise, is one of the major noise sources of aircraft (including the engine). To study the noise properties numerically is a popular approach with the increasing power of computers. Conventional approaches of using body-fitted grids at the boundaries would be convoluted due to the complex geometries, which
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Editorial Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-03-04 Tatiana Kozubskaya
I am pleased to introduce the special issue of International Journal of Aeroacoustics (IJA) composed of papers united by the common topic “Computational Experiment in Aeroacoustics and associated Aerodynamics” (CEAA).
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Adaptive RBF with hyperparameter optimisation for aeroacoustic applications Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-02-28 Lorenzo Burghignoli, Monica Rossetti, Francesco Centracchio, Giorgio Palma, Umberto Iemma
The present work reports an investigation on the use of adaptive metamodels based on radial basis functions (RBFs) for aeroacoustic applications of highly innovative configurations. The relevance of the topic lies on the paramount importance of metamodelling techniques within the design optimisation process of disruptive aircraft layouts. Indeed, the air traffic growth, consequently the hard environmental
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Boundary element analysis on the fuselage scattering of drone noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-02-26 Hanbo Jiang, Siyang Zhong, Xin Zhang, Xun Huang
Multi-rotor powered drones and urban mobility vehicles (UMV) have received considerable attention over recent years and attracted ever-increasing interest in their aerodynamic noise. Physics-based prediction tools for aerodynamic noise are of importance to facilitate quiet drone designs. In this work, a boundary element method (BEM) based solver is employed to evaluate the scattering of the rotor noise
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Application of LES combined with a wave equation for the simulation of noise induced by a flow past a generic side mirror Int. J. Aeroacoust. (IF 1.0) Pub Date : 2022-02-23 Ekaterina Guseva, Yuri Egorov
The paper presents validation results of a hybrid simulation method for aeroacoustics in turbulent flows at low Mach numbers. The hybrid method implemented in the Ansys Fluent® CFD package applies a scale-resolving turbulence model to compute the noise sources in an incompressible flow, while the noise propagation is modeled by a wave equation formulated for the acoustic potential. The selected test
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Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-11-18 Aya Aihara, Karl Bolin, Anders Goude, Hans Bernhoff
This study investigates the numerical prediction for the aerodynamic noise of the vertical axis wind turbine using large eddy simulation and the acoustic analogy. Low noise designs are required especially in residential areas, and sound level generated by the wind turbine is therefore important to estimate. In this paper, the incompressible flow field around the 12 kW straight-bladed vertical axis
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Fundamental investigation using active plasma control to reduce blade–vortex interaction noise Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-11-18 Trushant K Patel, Alexander J Lilley, Weiqi Shen, Christian Porrello, Alexander Schindler-Tyka, Subrata Roy, William E Lear, Steven AE Miller
Blade vortex interaction noise is a problematic and dominant component of rotor noise. Plasma actuators strategically placed at the tip of the rotor blades can reduce the strength of the tip vortices. This reduction has the potential to significantly reduce blade vortex interaction noise. A combined experimental, numerical, and theoretical program shows supporting evidence that low power plasma actuators
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Further assessment of a time domain impedance boundary condition for the numerical simulation of noise-absorbing materials Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-11-12 Stephane Redonnet
In regard to the mitigation of environmental noise across major industry sectors, the present study focuses on the numerical prediction of passive noise reduction devices. Here, it is further explored how the noise attenuation induced by locally reacting noise absorbing materials (also called acoustic liners) can be simulated using a time domain highly accurate Computational AeroAcoustics (CAA) method
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Effect of a pylon on the broadband noise sources of counter-rotating turbomachinery Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-11-05 Kristóf Tokaji, Csaba Horváth
Pylons are commonly used for the mounting of engines in the aircraft industry. On the other hand, the installation of a pylon influences the noise generation mechanisms and therefore alters the broadband noise characteristics of a given turbomachinery setup. In this investigation, a counter-rotating open rotor with and without a pylon is investigated in order to determine its effects on broadband noise
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Practical considerations for ray casting shear layer corrections Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-10-31 Todd Schultz
Aircraft noise reduction technology development has been aided by the use of acoustic phased arrays to identify component-level locations of noise sources. Acoustic phased arrays are commonly used in both closed-wall and open-jet wind tunnels, thus requiring accurate acoustic propagation models to focus the array. In particular, open-jet wind tunnels have complex flow fields including a free shear
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SwirlProp: A tool for sound propagation and attenuation in swirling flows Int. J. Aeroacoust. (IF 1.0) Pub Date : 2021-10-20 Ana Luisa P Maldonado, Jeremy Astley
The current trends for next generation turbofan engines are towards shorter nacelles and increased distances between the fan and the outlet guide vanes. This leads to an overall reduction in lined surface areas as well as an increase in the relative importance of the interstage liner, which is the liner placed between the rotor blades and the stator vanes. So far most of the efforts have been on liners