High Frequency Noise Prediction And Control Technology Study Of Certain Cabin Model

As the tonnage of the ship is biger and biger, the power equipment of the ship is more and more heavy. Both of these two reasons lead to the stronger mechanical vibration and bigger noise of the ship. In the pursuit of ship having faster speed and higher safety coefficient at the same time, people begin to pay more and more attention to the comfortable rate of the ship’s living and working environment, so the international organizations of the ship cabin noise level have made more stringent regulations and restrictions. As a result, the work of the ship cabin noise prediction and control technology research has the theory of ship design and building of great research value and practical significance.This paper has two contents: a certain ship’s cabin noise level is verified, and the related control technology is studied.Carry on the cabin model process. Mainly is the establishment of the geometric shape of the model and statistical energy analysis(SEA) acoustic model. Then the structure of the model subsystem of materials and physical properties are defined according to the actual design provisions; Then describe the definition of the concept, the selection principle and method for determining of the basic parameters of the acoustic model of statistical energy analysis method, including modal density, damping loss factor, coupling loss factor,the input power and of dynamic response of system, and basic parameters of some typical subsystem according to the empirical formula are calculated, and then apply it into the calculation of the model. Discuss the SEA method validation process, so as to prove the accuracy of the SEA method, it can be used for high frequency noise of the cabin forecast work.According to the literature selected in the early years of experience formula and model design of the main sources of incentive model par ameters selecte main excitation source types. Apply the determined source parameters on the cabin model. Forecast the noise level of the corresponding cabin. At the same time get high frequency noise sound pressure level response and energy clouds pictures of cabin model. Finally, carry on different control technology research of the the high frequency noise of the cabin model. Respectively use vibration isolation technology, sound absorption and damping vibration and noise damping noise reduction technical measures. Analyze and compare various control technology on different kinds of incentives such as air noise and structure noise incentives effect. Do the compartment of different control techniques on the same cabin noise reduction effect. At the same time, compare the same degree of noise reduction control technology for different cabins noise reduction effect. Compare the scope of application and effect of all kinds of control technology.