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http://dx.doi.org/10.7837/kosomes.2019.25.6.765

Prediction of Broadband Noise for Non-cavitation Hydrofoils using Wall-Pressure Spectrum Models  

Choi, Woen-Sug (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Jeong, Seung-Jin (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Hong, Suk-Yoon (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Song, Jee-Hun (Department of Naval Architecture and Ocean Engineering, Chonnam National University)
Kwon, Hyun-Wung (Department of Shipbuilding and Marine Engineering, Koje College)
Kim, Min-Jae (Naval System R&D Institute, Agency for Defense Development)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.25, no.6, 2019 , pp. 765-771 More about this Journal
Abstract
With the increase in the speed of ships and the size of ocean structures, the importance of flow noise has become increasingly critical in meeting regulatory standards. However, unlike active investigations in aeroacoustics fields for airplanes and trains, which are based on acoustic analogy methods for tonal and broadband frequency noise, only the discrete blade passing frequency noise from propellers is considered in marine fields. In this study, prediction methods for broadband noise in marine propellers and underwater appendages are investigated using FW-H Formulation1B, which can consider the mechanism of primary noise generation of trailing edge noise. The original FW-H Formulation 1B is based on the pressure correlation function tolackitsgeneralityandaccuracy. To overcome these limitations, wall-pressure spectrum models are adopted to improve the generality in fluid mediums. The comparison of the experimental results obtained in air reveals that the proposed model exhibits a higher accuracy within 5 dB. Furthermore, the prediction procedures for broadband noise for hydrofoils are established, and the estimation of broadband noise is conducted based on the results of the computational fluid dynamics.
Keywords
Flow Noise; Non-cavitation Noise; Trailing-Edge Noise; Wall Pressure Spectrum; Broadband Noise;
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