Propeller Acoustic Measurements in Atmospheric Towing Tank

The study describes the implementation of experimental procedure for measuring the hydrodynamic noise generated by model scale marine propellers in atmospheric towing tank. The study is limited to non-cavitating conditions of the propeller as the experimental tank is at atmospheric pressure. The towing carriage and conditions have not been altered admitting the existence of considerable background noise. The feasibility analysis included experimental and theoretical study of the background noise at the operating conditions. Some considerations about the uncertainty of the results are also presented. The experimental equipment, set up and procedure for measuring the acoustic pressure around model ship propeller and/or hull is also described. Simultaneous measurements with various differently positioned hydrophones at multiple hydrodynamic conditions permitted to evaluate the background and propeller/hull generated acoustic field at a range of frequencies. An appropriate treatment of the recorded time series characterised the background disturbances and permitted to obtain net results with sufficient signal to noise ratio, mostly from narrowband spectral analysis. Results for the impact of the hull presence on propeller acoustic field are presented and discussed. The extrapolated results are compared informatively with full scale measurements. The research presented in this paper is a result of the Collaboration agreement on underwater acoustics between CEHIPAR and ITM and is partially funded by the European Commission project AQUO (Achieve Quieter Oceans by Shipping Noise Footprint Reduction), Seventh Framework Programme, Grant number 314227, FP7-SST-2012.1.1-1.

Language

  • English

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Filing Info

  • Accession Number: 01602965
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 27 2016 2:30PM