Study Of Cabin Noise Prediction And Control According To The New International Criterion

The improvement of people's living level has led to an increased demand for ship comfort during the voyage in recent years. Therefore, the problem of ship noise has become more prominent. Whereas ship noise is a source of disturbance to the work and rest of the crew, much louder noise will definitely result in a hearing damage. This consequently led IMO MSC 91 to adopt a resolution on the SOLAS amendments to enforce new on-board noise standards (DE56) of MSC.337 resolutions starting from July 2014. This has set higher requirements for the capacity of ship design and construction.In order to study the impact of the new standards enforcement on China's shipbuilding industry, as well as the response to the new standards, the following aspects of research have been carried out in this paper:(1) New noise standard (DE56) is compared to the current international noise standards(IM0468 standards). The differences in the various classification societies' cabin noise specifications are also compared. The analysis of relative changes from DE56 standard to IM0468 standard is carried out in this paper;(2) In line with the relevant regulations implemented on the cabin noise measurement requirements and processes, noise measurements of 19 new domestic bulk carriers and oil tankers are carried out. A comparative analysis of cabin noise level of the new ships is done;(3) The basic principles of Energy Analysis Methods and Hybrid FE / SEA Method and the relevant parameter's determination of the two methods are researched;(4) According to the modeling principles (from LF to HF) of SEA methods and Hybrid method, ship models for a bulk carrier and an oil tanker are built. Consideration of excitation loads, indoor ventilation noise, outfitting material, and cabin noise prediction is made;(5) The sensitivity to noise control of the outfitting material parameters is studied. The noise level in the cabins is evaluated by combining the DE56 standard. Noise control is evaluated for cabins that fail to meet the criteria. This led to the formulation of a reasonable method from cabin noise measurement and analysis and also noise control design.