Prediction of Non-Cavitating Underwater Propeller Noise

Seol, Hanshin; Jung, Bu Jin; Suh, Junghun; Lee, S.

doi:10.1006/jsvi.2002.5035

Cited by 85 publications

(44 citation statements)

References 10 publications

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“…So, q min =-sB-2 and q max =-sB+3 are considered. Where, s is a counter of blade's harmonies, B is the number of blades and q is the circumference harmonies in the Fourier series of Equation (2).…”

Section: Unsteady Forces Results In 3 Cross-sections By Inverse Methodsmentioning

confidence: 99%

“…There are a lot of researches where sound pressure level of far-field has been investigated by the assist of these equations. In works by Seol et al in 2002 and [2,3], Caro et al [4], Jin-ming et al [5], Pan et al [6] and Bagheri et al [7,8], the SPLs obtained using FW-H Equations. Generally, acoustic pressure can be generated because of three kinds of sources.…”

Section: Introductionmentioning

confidence: 99%

“…These forces can be formed in blade passing frequency (BPF) and the multiples of the blade frequencies. There are some researches [2][3][4][5][6][7][8] where, although acoustic pressure field in far field has been extracted by solving the flow, dipole sources which are the most important sources of producing sound in non-cavitating conditions have not been considered.…”

Section: Introductionmentioning

confidence: 99%

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The Noise Dipole Source Prediction of Far-Field Acoustic Pressure for Marine Propeller using Inverse Method

Mr¹,

Mehdigholi²,

Ms³

et al. 2017

J Appl Mech Eng

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The unsteady rotating force or dipole strength distribution, acting by the fan or propeller on the fluid, is predicted by inverse method. In this method, the far-field acoustic pressures are used in non-cavitating condition. In this paper, the far-field acoustic pressures are obtained from Ffowcs Williams and Hawkings (FW-H) equations using computational fluid dynamic (CFD) in specific hydrophone array and then the unsteady rotating force, acting by the propeller on the fluid, is obtained as the most important sound source in non-cavitating condition. The unsteady rotating forces are extracted using inverse method by analytical code in Matlab. The correct solution is independence to the optimum select of regularization parameter from transfer function; the transfer function represents relationship between the force coefficients and the far-field acoustic pressure. Therefore, the appropriate range of regularization parameter should be choice in order to an ill-conditioned problem from transfer function is solve. The analytical code is solved for different regularization parameters and then the unsteady rotating forces are obtained for three sections on the blade surface. The inverse method could be used for dipole strength distribution calculation as the most important sound source in non-cavitating condition in order to design the noiseless of marine propeller.

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Section: Unsteady Forces Results In 3 Cross-sections By Inverse Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Noise Dipole Source Prediction of Far-Field Acoustic Pressure for Marine Propeller using Inverse Method

Mr¹,

Mehdigholi²,

Ms³

et al. 2017

J Appl Mech Eng

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show abstract

“…Most of the experimental studies are performed in the model-scale with multiple pressure transducers mounted on the hull surface above the propeller to monitor the hull pressure [1,2]. According to the level of simplification that can be made, the numerical approaches for underwater noise simulations can be divided into compressible Navier-Stokes equation-based approaches, Lighthill equation-based approaches, Ffowcs-Williams-Hawkings equation-based approaches [3,4], Helmholtz equation-based approaches [5], and hybrids of any two. These equations are usually implemented by either a finite volume method in which the propeller is modelled by a rotating boundary [4,6] or by the boundary element method (BEM) [3,7] in which the propeller is represented by sources and dipoles on the boundary surface.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Propeller-Induced Hull Pressure Fluctuations via a Potential-Based Method: Study of the Effects of Different Wake Alignment Methods and of the Rudder

Kim

Kinnas

2018

JMSE

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Abstract:In order to predict ship hull pressure fluctuations induced by marine propellers, a combination of several numerical schemes is used. The propeller perturbation flow is solved by the boundary element method (BEM), while the coupling between a BEM solver and a Reynolds-averaged Navier-Stokes (RANS) solver can efficiently predict the effective wake. Based on the BEM solution under the predicted effective wake, the propeller-induced potential on the ship hull can be evaluated. Then, a pressure-BEM solver is used to solve the diffraction pressure on the hull in order to obtain the solid boundary factor which leads to the total hull pressure. This paper briefly introduces the schemes and numerical models. To avoid numerical instability, several simplifications need to be made. The effects of these simplifications are studied, including the rudder effect and the wake alignment model effect.

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“…al. [2] [5] studied and validated noise predictions for a NACA-0012 airfoil. Then they applied the same method to compute the broadband noise spectrum of an aircraft.…”

mentioning

confidence: 99%