Consideration of vibroacoustic requirements in the design of marine mechanical installations

Abstract

The analysis of sources and the adoption of measures to reduce the noise of shipboard mechanical installations after the construction of the vessel is ineffective, since the measures on the finished vessel are mainly reduced to the placement of additional vibration and sound insulation and sound absorption equipment, without addressing noise reduction in the source. Their implementation leads to a delay in delivery dates and an increase in the cost of building the vessel as a whole. An analysis of the cost of noise reduction on ships to the required values shows that if it is possible to take all necessary measures at the design stage, then the cost of an anti-noise complex will amount to only one third of the cost of additional noise reduction measures on an already built vessel. It has been found that measures to reduce noise and vibration of shipboard mechanisms are most effective and economical if they are adopted at the design stage of a power plant in the process of developing a power plant scheme, selecting mechanisms and presenting acoustic requirements to equipment suppliers. The vibration and noise levels of machinery are primarily influenced by the operating process, design, manufacturing technology, and operating mode. It has been established that, to ensure sanitary noise standards on ships, the above-mentioned measures to reduce noise and vibration at the source must be combined with the use of vibration isolation, vibration damping, sound insulation, and sound absorption.