毕业论文移动版

摘要在军事领域当中，结构的振动和噪声对船舶本身的隐蔽性以及船舶的声呐系统的作用距离都有很大的影响。而在实际中鱼雷、潜艇以及其他各种水下航行器舱段的主要结构形式就是环肋圆柱壳，因此对环肋圆柱壳的振动与噪声的性能分析具有非常重要的理论价值和实际意义。87022

统计能量分析方法（Statistical Energy Analysis缩写为SEA）起始于20世纪60年代的航空航天工业，其从能量的角度利用统计的观点去分析复杂结构在外载荷作用下的响应，这样能够快速、准确的模拟中、高频段声学特性，也能很有效地预估产品结构的振动特性。

本文简单的介绍了统计能量分析法的基本原理和适用范围，并基于VA one软件平台建立了环肋圆柱壳单、双层的统计能量分析模型，再利用统计能量方法对其进行了中、高频振动噪声的计算和研究。通过控制变量方法，研究环肋圆柱壳振动的影响因素，从而找出减振降噪的有效方法。

毕业论文关键词：统计能量法，VA one，环肋圆柱壳，振动计算，噪声控制

Abstract In the military field, the vibration and noise of the structure have a great influence on the concealment and ship sonar range of ship itself。 The main structure of aircraft cabin in the torpedo、submarine and other underwater is ring stiffened cylindrical shell, so it is very important to analyze the vibration and noise of the ring stiffened cylindrical shell。

The statistical energy analysis method(Statistical Energy Analysis abbreviated as SEA) starts from the aerospace industry in 1960s, from the point of view of energy, the statistical analysis is used to analyze the response of complex structures under external loads, this can quickly and accurately simulate the acoustic characteristics of middle and high frequency segments, it can also be very effective in predicting the vibration characteristics of the product structure。

This paper simply introduces the basic principle of statistical energy analysis method and its application range, the statistical energy analysis model of single and double layers ring stiffened cylindrical shell is established, based on VA one software platform, then the calculation and study of the vibration and noise of the middle and high frequency vibration and noise are carried out by using the statistical energy method。 The influence factors of ring stiffened cylindrical shell vibration are studied by means of controlling variable method, so as to find out the effective method of reducing vibration and noise。

Keywords:Statistical Energy Analysis, VA one, Ring stiffened cylindrical shell, Vibration calculation, Noise control。

目    录

第一章   绪论 1

1。1 研究背景 1

1。2 国内外研究进展 1

1。2。1 解析预报 3

1。2。2 发展趋势与研究展望 5

1。3 本文研究的主要内容 5

第二章 统计能量法的原理与应用 7

2。1 概述 7

2。2 适用范围 7

2。4 基本参数 10

2。4。1 模态密度 10

2。4。2 内损耗因子 11

2。4。3耦合损耗因子 11

2。4。4 输入功率 13

2。5 统计能量法应用软件VA one 13