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Research on Predictive Method for Mechanical Noise of Underwater Vehicles

Author: YuZiYang
Tutor: YangDeSen
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: Underwater Vehicle Noise prediction Mechanical noise Structure-borne noise
CLC: U674.941
Type: Master's thesis
Year: 2007
Downloads: 262
Quote: 1
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Abstract


Underwater vehicle usually refers to submarines, torpedoes and other underwater weapons systems. Mechanical noise is the main noise source of the underwater vehicle, it directly restricts the battle and the viability of the underwater vehicle. Developed underwater vehicle noise and vibration reduction very seriously. The mechanical noise Forecast for noise control work provides quantitative indicators and control the direction of the basis for the design of low-noise. For this reason, to carry out underwater vehicle machinery noise prediction research is very necessary. In this paper, two aspects of the research, study the formation mechanism of the underwater vehicle machinery noise and mechanical noise source characteristics, and on the basis of analysis of the mechanical noise of the forecasting methods; take theoretical analysis and experimental research a combination of methods, the structure of the underwater vehicle noise prediction method. The structural noise prediction relates to the excitation source, the vibration transmission and the housing of acoustic radiation, wherein the excitation source is the main consideration of the mechanical vibration of the engine, by the transmission of vibration of the vibration isolation system, the base surface impedance. Elastic cylindrical shell underwater vehicle machinery spaces main structure, the rest of the cabin vibration and sound radiation attenuation certain rules. Different forecasting methods and prediction model for forecasting the mechanical noise of the underwater vehicle should be used for different analytical band. Analytical method can be predicted loop frequency bands below the underwater vehicle machinery noise, the method can be underwater vehicle machinery spaces below the ring frequency band acoustic radiation power, average surface vibration velocity and radiation efficiency. Radiation efficiency and average surface vibration velocity can be more than the frequency of the ring underwater vehicle mechanical sound power and sound pressure levels; input impedance of the shell structure of the underwater vehicle, the vibration characteristics and acoustic radiation efficiency research, combined with experimental research has been quite satisfactory forecasting model and forecast results. In short, according to the analysis band corresponding prediction model and forecasting methods of underwater vehicle mechanical noise is reasonable to predict, based on the forecast results to develop and validate underwater vehicle vibration and noise reduction technology, and for underwater The design of the large-scale structure optimization. Therefore, this study has practical significance.

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CLC: > Transportation > Waterway transport > Marine Engineering > Various types of vessels > Ships: navigation state points > Dive boat
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