Frequency-domain method for discrete frequency noise prediction of rotors in arbitrary steady motion

Gennaretti, Massimo; Testa, Claudio; Bernardini, Giovanni

doi:10.1016/j.jsv.2012.06.004

Cited by 27 publications

(8 citation statements)

References 10 publications

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“…[19][20][21][22][23][24] Compared with the TDNM, the FDNM can usually avoid the numerical interpolation and has a unified numerical algorithm for both subsonic and supersonic cases, but it usually takes more computational time for the broadband noise prediction due to the repeated integration at each frequency.…”

Section: Introductionmentioning

confidence: 99%

Frequency-domain model of tonal blade thickness and loading noise

Mao

2014

The Journal of the Acoustical Society of America

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A tonal thickness noise and loading noise model of rotating blades has been developed as an extension of the exact frequency-domain solutions for rotating monopole and dipole point sources. The present model has two advantages over the previous methods and models for noise prediction. The first is the unified expression for sources in subsonic and supersonic rotation even at rest. The second is that the present model has no limit on the location of the observer and no interpolation error. Two test cases are carried out to validate the present model and emphasize its advantage at the noise prediction for sources in supersonic rotation. Moreover, as a specified application of the present model for the rotating blades whose tip radius is acoustically compact, acoustic energy distribution at different frequencies and in different directions is analyzed. Result shows that the acoustic energy of acoustically compact rotating blades is mainly concentrated at the source frequency while propagating along the axial direction, leaving the rest propagating along the radial direction at the other frequencies.

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Section: Introductionmentioning

confidence: 99%

Frequency-domain model of tonal blade thickness and loading noise

Mao

2014

The Journal of the Acoustical Society of America

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“…Farassat's version (time domain) has been recently reformulated for the frequency domain. 118 Ffowcs Williams and Hawkings' integral formulation relies on a compressible flow simulation. Only if the sources are compact, an incompressible flow solution can be utilized to solve the integral sufficiently well.…”

Section: From Lighthill's Solution To Ffowcs-williams and Hawkings Anmentioning

confidence: 99%

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Schoder

2019

J. Theor. Comp. Acout.

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This paper collects the state of the art and the tremendous progress that has been made in hybrid modeling of aeroacoustic sound. Hybrid modeling is defined such that flow and acoustics are modeled separate and connected by an aeroacoustic model. The contributions will be classified with respect to the aeroacoustic models being developed, covering Lighthill’s analogy, Ffowcs Williams and Hawkings, vortex sound, linearized Euler equations (LEE), and different perturbation equations modeling flow induced sound. Within each topic, specific applications, such as jet noise, aircraft noise, ground mobility, noise, fan noise and human phonation, are covered. We focus on the accomplishments and provide the authors’ contribution to aeroacoustic research. Eventually, a concise summary of the different methods and their capabilities is included.

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“…Gennaretti et al. 8 proposed a frequency domain prediction method for propeller line spectrum noise. The method uses the boundary integral formula of the FW–H equation time domain solution proposed by Farassat 9–11 to express the line spectrum noise as a harmonic function of the motion of the object and the aerodynamic load through the frequency response function matrix.…”

Section: Radiation Sound Of Non-cavitation Thrustermentioning

confidence: 99%

A summary of acoustic characteristics and control techniques of underwater non-cavitation thruster

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper gives a detailed description of the mechanism of sound production, acoustic characteristics and prediction methods for radiation sound spectrums (low frequency line spectrum, low frequency broadband spectrum and high frequency broadband spectrum) of non-cavitation thruster and the secondary acoustic radiation caused by the unsteady force which excited both shaft system and hull in the unsteady flow field. It indicates that the underwater thruster has a great influence on underwater noise of the navigation body with its direct or secondary radiation sound. The paper also describes two control methods, one is mostly used to control the uniformity of the flow field, while the other is used to design low-noise thruster such as pump-jet thruster and highly skewed propeller. Additionally, a new type multi-blade coupling propeller with unique features is proposed to achieve further noise reduction and open water performance improvement.

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Frequency-domain method for discrete frequency noise prediction of rotors in arbitrary steady motion

Cited by 27 publications

References 10 publications

Frequency-domain model of tonal blade thickness and loading noise

Frequency-domain model of tonal blade thickness and loading noise

Hybrid Aeroacoustic Computations: State of Art and New Achievements

A summary of acoustic characteristics and control techniques of underwater non-cavitation thruster

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