Non-linear noise from a ship propeller in open sea condition

Cianferra, Marta; Petronio, Andrea; Armenio, Vincenzo

doi:10.1016/j.oceaneng.2019.106474

Cited by 40 publications

(37 citation statements)

References 28 publications

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“…(2020) appears more broadband compared with the signal observed in the present work is mainly due to the different operating conditions and geometry of the propeller, namely, to the pulling low-loading condition reproduced in Cianferra et al. (2019 b ) versus the pushing high-loading conditions of Posa et al. (2019).…”

Section: Scaling Analysis Of the Fwh Equationmentioning

confidence: 37%

“…Hereafter, we quantify the error associated with the imperfect scaling, taking advantage of a database of a laboratory-scale marine propeller, analysed and discussed in detail in Cianferra et al. (2019 b ).…”

Section: Scaling Analysis Of the Fwh Equationmentioning

confidence: 99%

“…The flow field is not calculated from scratch, rather, we use the database of Cianferra, Petronio & Armenio (2019 b ), relative to a propeller in open sea conditions at . This is the main reason why the present paper is devoted to the analysis of a ship propeller, although the theoretical framework and the results of the analysis are of wide interest in fluid mechanics.…”

Section: Introductionmentioning

confidence: 99%

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Scaling properties of the Ffowcs-Williams and Hawkings equation for complex acoustic source close to a free surface

Cianferra

Armenio

2021

J. Fluid Mech.

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We perform a scaling analysis of the terms composing the Ffowcs-Williams and Hawkings (FWH) equation, which rules the propagation of noise generated by a rigid body in motion. Our analysis extends the seminal work of Lighthill (Proc. R. Soc. Lond. A, vol. 211, 1952, pp. 564–587) and the dimensional analysis of classical sources (monopole, dipole and quadrupole) considering all the FWH integral terms. Scaling properties are analysed in light of perfect/imperfect similarity when laboratory-scale data are used for full-scale predictions. As a test case we consider a hydrodynamic example, namely a laboratory-scale ship propeller. The data, obtained numerically in a previous study, were post-processed according to the scaling analysis presented herein. We properly scale the speed of sound to obtain perfect similarity and quantify the error with respect to the imperfect scaling. Imperfect similarity introduces errors in the acoustic response related both to the linear terms and to the nonlinear terms, the latter of great importance when the wake is characterized by robust and organized vorticity. Successively, we analyse the effect of a free surface, often present in hydrodynamic applications. We apply the method of images to the FWH equation. The free surface may generate a frequency-dependent constructive/destructive interference. The analysis of an archetypal acoustic field (monopole) provides robust explanation of these interference effects. Finally, we find that imperfect similarity and the absence of a free surface may introduce errors when model-scale data are used to obtain the full-scale acoustic pressure. The error is small for microphones placed in the near field and becomes relevant in the far field because of the nonlinear terms.

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Section: Scaling Analysis Of the Fwh Equationmentioning

confidence: 37%

Section: Scaling Analysis Of the Fwh Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scaling properties of the Ffowcs-Williams and Hawkings equation for complex acoustic source close to a free surface

Cianferra

Armenio

2021

J. Fluid Mech.

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“…Melalui perbandingan estimasi fluktuasi dengan hasil pengukuran, pendekatan yang diusulkan untuk komponen kecepatan arus masuk akibat gerakan orbital gelombang berhasil divalidasi. Perbedaan Gerakan tersebut menghasilkan getaran yang tingkat linearitas dari putaran yang dihasilkan berdasarkan alignment poros propeller [13], [14]. Prediksi perhitungan kekuatan hidrodinamik pada propeller dengan sudut lancip yang berbeda dan unit drive podded dalam model azimuthing menunjukan hasil evaluasi kinerja propulsive dari system penggerak podded yang cukup menunnjukan trend positif.…”

Section: Gambar 1 Propeller Hub Caps Finunclassified

Analisa Performa Kapal Km. Ciremai Dengan Modifikasi Penambahan Propeller Hub Caps Fin Dengan Metode Eksperimen

Suharto

Sulaiman

2020

gematek

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The various ship propulsion models there are several considerations in the selection to be applied to the ship, such considerations are required in the planning of the ship's propulsion. With the addition of propeller hub caps fin is expected to deliver a flow model that supports the performance of propulsion systems on ship. The purpose to analyzes the best performance of the propeller shaft engine, representing a comparison of fuel consumption efficiency, as well as ship speed based on the addition of propeller hub caps fin on MV. CEREMAI. Method used was conducted experimentally to determine the performance of the ship's engines before and after using energo pro fin (propeller hub caps fin) with sea trial. Result shows 2% reduction in fuel consumption on the portside main engine and 3% starboard main engine. As well as enabling increased operational speed of KM ships. CIREMAI at 12% with the same rpm round. So selection of ship propeller types affects the performance of enegro profin (propeller hub caps fin).

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“…Moreover, the application of scale resolving simulations (i.e. DES or LES) together with the FW-H equation is increasing for the prediction of marine propeller URN under non-cavitating conditions (Ianniello and De Bernardis, 2015;Testa et al, 2018;Cianferra et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of marine propeller underwater radiated noise using acoustic analogy Part 2: The influence of eddy viscosity turbulence models

et al. 2021

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Non-linear noise from a ship propeller in open sea condition

Cited by 40 publications

References 28 publications

Scaling properties of the Ffowcs-Williams and Hawkings equation for complex acoustic source close to a free surface

Scaling properties of the Ffowcs-Williams and Hawkings equation for complex acoustic source close to a free surface

Analisa Performa Kapal Km. Ciremai Dengan Modifikasi Penambahan Propeller Hub Caps Fin Dengan Metode Eksperimen

Numerical investigation of marine propeller underwater radiated noise using acoustic analogy Part 2: The influence of eddy viscosity turbulence models

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