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Analysis of Response Variance and Research on Surrogate Models for Acoustic Radiation of Underwater Structures

Author: YangZuoZuo
Tutor: LiSheng
School: Dalian University of Technology
Course: Design and manufacture of ships and marine structures
Keywords: Modal model SDOF analysis method Fluid load Acoustic radiation Response variability kriging model Principal component decomposition Agent model
CLC: TB566
Type: Master's thesis
Year: 2010
Downloads: 59
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Abstract


Structural vibration and noise prediction and control is a very important research topic in the field of ship engineering. Design analysis model fidelity and variability in production led to a structural change of the dynamic characteristics of engineering practice to consider the variability of the structural response. In the underwater structure acousticst design optimization, the relationship between design parameters and system response to complex numerical calculation can be time-consuming to obtain, directly numerical calculation model for design optimization, often due to the calculation of excessive can not be implemented. The agent model can be used in place of high-precision calculation model for real-time analysis. Therefore to carry out underwater structural acoustic radiation response variability analysis and proxy model, for fast, accurate prediction of structural vibration and noise, and have important significance in the optimization design of structural vibration and acoustic radiation. Underwater structural acoustic radiation response variability as well as the agency model of acoustic radiation calculated using numerical methods, to complete the work as follows: the elasticity theory of finite element method as well as the structural dynamic characteristics theory, based on the Mindlin plate bending theory, diaphragm (shell) unit derived with rotational degrees of freedom of the four-node isoparametric Mindlin plate bending theory is based on the finite element model study. Simply supported rectangular sheet, for example, calculated the inherent characteristics of vibration of plates in a vacuum, and compared with the analytical solution, to verify the effectiveness of the unit model. Fluid-structure interaction vibration theory and research methods, the research domain of acoustic radiation problem solving unbounded boundary element method, structural finite element method and acoustic BEM wears combination of solving the underwater structural vibration and acoustic radiation coupled finite element / boundary element equations. Embedded in the infinite baffle plate structures using finite element method and considering the fluid loading sheet acoustic radiation formula is derived based on the boundary element method of the Rayleigh surface integral. A thin rectangular plate, for example, a fluid medium, the thickness of the plate, the location of the point force, boundary conditions and plate material radiated sound power. Modal analysis of fluid load under the structure of the natural frequency and modal damping ratio, calculated based on modal reduction method and not consider the additional fluid damping fluid loaded structure modal matrix, to solve the structure - acoustic coupling vibration response model simply supported rectangular sheet, for example, calculate the plate surface method to speed and radiation sound power, and were compared with the results obtained by finite element - boundary element coupling method, to verify the validity of the modal model. The analytical model calculations of single-degree-of-freedom structural acoustic radiation power variability. A thin rectangular plate, for example, the use of a single degree of freedom, were calculated plate thickness change panel concentrated mass distribution change radiated sound power radiated sound power disturbances than draw the natural frequency of the disturbance to the timing of acoustic radiation power and acoustic radiation power disturbances than the envelope, and were compared with the results obtained by finite element - boundary element coupling method. Established the underwater structure acousticst calculated based on the Kriging model agent model can predict the resonance frequency of the sound power level of the underwater structure. Also the main component of the decomposition and Kriging model combined to predict the radiation response of the vibration and sound throughout the calculated band agent model. The agent model can respond to real-time prediction vibration and sound radiation of underwater structure based on the sample information in the entire design space. Underwater stiffened plate vibration and acoustic radiation, for example construction and validation of the agent model: First, based on the optimal symmetric Latin hypercube sampling method to select the sample points in the design space, and underwater structures based on high-precision vibration sound radiation The calculation method to get the response value of each sample point, again based on the Kriging model and principal component decomposition to construct a proxy model and to test the model.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Underwater Acoustics > Underwater acoustic detection
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