Full-band ship cabin noise prediction and acoustic optimization design method

Abstract

The invention provides a full-band ship cabin noise prediction and acoustic optimization design method. The method comprises the steps that characteristic numbers are used as a frequency range dividing standard, according to geometric and physical properties of a ship structure and an acoustic cavity, the characteristic numbers are calculated, and based on the magnitude of the characteristic numbers, an analyzing frequency band is divided into low frequency, medium frequency and high frequency; according to the magnitude of the characteristic numbers and the characteristics of the ship structure, low-frequency, medium-frequency and high-frequency ship cabin noise prediction models are built; through real ship testing or an empirical formula, main power device structure noise and air noiseare obtained, and power device vibration acceleration is equivalent to exciting force; loss factors in the ship structure and the acoustic cavity are obtained through estimation; by using the finite element method, the finite element-statistical energy hybrid method and a statistical energy method, low-frequency, medium-frequency and high-frequency ship vibration and cabin noise of a ship are calculated; the medium-frequency noise and the high-frequency noise in the ship cabin are subjected to sound absorption and noise reducing research and acoustic optimization design. A full-band ship cabinnoise prediction process and a control scheme are provided, and the method can be used for various ships.

Description

technical field [0001] The invention relates to the technical field of ship cabin noise prediction, in particular to a full-frequency cabin noise prediction and acoustic optimization design method for a ship, which can realize full-frequency cabin noise prediction and control of the ship. Background technique [0002] The cabin noise caused by the vibration of ship mechanical equipment will seriously affect the comfort and physical and mental health of the crew and passengers. The classification societies of various countries and the International Maritime Organization have made stricter regulations on the noise of ship cabins and mechanical equipment. Preliminary cabin noise prediction and cabin noise reduction design research in the design stage are of great practical significance to improve ship construction quality and reduce ship construction cost. [0003] At present, researchers at home and abroad have done a lot of research on ship cabin noise prediction methods, but...

AI Technical Summary

Problems solved by technology

[0006] After summarizing the research status at home and abroad, it is found that there are still the following deficiencies in the noise prediction of ship cabins: ① There are more studies on cabin noise forecasting for high frequency bands, and less research on cabin noise forecasting methods and processes for full frequency bands

②Most scholars have conducted research on sound absorption and noise reduction in ship cabins, but few have conducted acoustic optimization design for cabin noise

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