Evaluation of a semi-empirical method for the propeller noise spectrum of a fisheries research vessel

Batuhan Aktas, Patrick Fitzsimmons, Mehmet Atlar

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

The underwater noise created by commercial shipping significantly contributes to the ambient noise levels of the world seas; therefore the rising environmental awareness concerning the commercial shipping emissions has recently targeted the noise radiated from commercial vehicles. Within this framework this paper presents the evaluation of a semi-empirical method and associated computer code, PROS-SPEC (Propeller Noise Spectrum Program), to predict the propeller underwater noise spectrum of ships by making use of an available model and full-scale noise data for a Fisheries Research Vessel (FRV). The full-scale noise spectra data are first obtained by the extrapolation of the noise measurements made in the Emerson Cavitation Tunnel of Newcastle University, which is a middle size cavitation tunnel, and compared with the full-scale trials of the FRV. Hence the details of this extrapolation procedure are first given in the paper. This is followed by an in-depth review of the semi-empirical method, which is used as the basis in the PRO-SPEC code, with a view to its potential application to wider ship types using a larger database. In this respect initially the conceptualization of the noise spectra into its cavitating and non-cavitating components are made and a critical review of the database is presented by scrutinising the regression analysis and its dominant parameters representing the data base. Following this critical review the semi-empirical method is evaluated to predict the noise spectra of the subject FRV for which both the model test based extrapolations and full-scale measurements are used. The comparison of the predicted noise spectra with the extrapolated data and full-scale measurements present reasonable accuracy with a useful insight into the cavitating and non-cavitating contributions and indicating the useful potential of the method to wider applications.which are further discussed in the paper.
Original languageEnglish
Title of host publicationThe 22nd International Conference on Sound and Vibration
Number of pages8
Publication statusPublished - 2015

Keywords

  • underwater noise
  • ambient noise levels
  • propeller underwater noise spectrum

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    Aktas, B., Fitzsimmons, P., & Atlar, M. (2015). Evaluation of a semi-empirical method for the propeller noise spectrum of a fisheries research vessel. In The 22nd International Conference on Sound and Vibration