The acoustic design of the research vessel SHARP

Abstract

The R/V HUGH R. SHARP is a general purpose research vessel that is owned and operated by the University of Delaware. It has been designed to achieve the International Council for the Exploration of the Seas (ICES) underwater noise limit for Fisheries Research Vessels. This paper describes the design process, construction details, and final results with regard to the acoustic design of this ship. Both compartment airborne noise and underwater radiated noise predictions were carried using a proprietary shipboard noise prediction program. Noise control treatments that were used include: vibration isolated machinery, double-stage isolated diesel generators, damping tiles, special acoustic insulation, and floating floors. After the vessel was completed a series of at-sea tests was performed to check compliance to vibration, compartment noise, and underwater noise. Two problems were discovered with underwater noise levels. One was related to a gearbox and the other was related to the propellers. A discussion of both issues and the final results are given in the paper. [Support provided by the University of Delaware, College of Marine Studies, in particular Mr. Matthew Hawkins, Director of Marine Operations.]