Research On The Noise Prediction And Control Technology Of Ship Superstructure Cabin

Nowadays,noise pollution has become one of the three major sources of pollution in the world,with air pollution and water pollution.The international maritime organization(imo),the latest "rules of the ship's noise" by the international maritime organization(imo),introduced a higher demand for the noise level of the cabin in 2012.And ship superstructure cabins generally work for crew living places,in order to provide the crew with a comfortable and quiet environment,protect the psychological health of the crew,it is very important to study the noise forecast method of ship's cabin.The work of this paper is to study the method of the full frequency domain of the cabin noise of the superstructure of the ship,and to study the noise control technology.Firstly,the method of full frequency domain prediction is determined.According to the model size has been given in the literature,such as conditions of use of VA one and 702 ship acoustic design software modeling,using the whole frequency domain forecast methods to solve.By comparing the forecast results with the actual measurement results,the accuracy of the full frequency domain prediction method and the VA one software forecasted the noise of the ship cabin room are verified.Using the two software to establish the SEA model of the target ship,and establishing the corresponding frequencies within the corresponding research methods for calculating model,at the same time use the new standard for the study of the 15 major cabin of the ship noise level has carried on the forecast research,comparison,and the possible causes of noise para-normal in cabin are analyzed.Then,studying the effects of modeling on cabin noise prediction accuracy.For modeling way is considered the outboard side and water in the inland waters of the effects of cabin noise,analyzing the establishing the ship and only a typical compartment model for cabin noise prediction,the influen ce of accuracy analysis compares the selection the effects of different kinds of noise excitation of cabin noise,the results of the typical module were found to be very large.Studying the effects of three general techniques on cabin noise.By using the acoustic mask of the host to analyze the noise reduction effect of the isolation technique.To analyze the noise reduction effect of the vibration isolation technique by changing the coupling method.To analyze the effect of damping damping technique on cabin noise by means of damped material.Three methods have obvious effect on vibration reduction and noise reduction.Finally,studying the influence of structural change on superstructure cabin noise.Analyzing the influence of superstructure cabin partition layout,studying the effect of the distance between the flue and the superstructure cabin on the cabin noise,and deduce the formula of cabin noise from the distance between the flue and the superstructure cabin and the height of the cabin to the main deck.