基于模态滤波的板壳类结构空间均方振速估算方法

针对船舶、航空航天等工程领域中板、壳类结构振动噪声评价问题,将广泛应用于控制工程中的模态滤波理论引入到结构振动评估领域,建立了一种估算结构空间均方振速的新方法.该方法的特点是能在激励源信息未知的情况下,以布置在结构表面有限个振动传感器测量得到的振动响应作为主要输入,估算板、壳类结构的空间均方振速,从而评价结构的整体振动状态.依据该方法对一矩形平板结构受点力、线力和面力等3种典型的激励源作用下,通过少量结构振动测点的振动信息,分别对其空间均方振速进行了数值验证;同时利用一水下加肋圆柱壳结构进行了试验验证.数值和模型试验验证结果表明：利用该方法评估得到的振动速度谱线特征与精确解和实测值基本一致,评估误差在2 dB以内,满足工程应用精度要求.该方法可以应用于工程中板、壳类结构振动噪声评价和振动状态的在线监测评估.     

水下结构物舱壁振动控制的结构参数优化研究

舱壁结构参数选择对舱壁振动性能有直接影响。为减小舱壁振动,采用有限元法,选择舱壁板厚度、加强筋数量、加强筋截面大小为变化的结构参数,分析振动随激振力频率、激振力作用方向、舱壁结构参数的变化规律,得到在动载荷作用下,舱壁振动的均方法向速度频响曲线,并以此为依据,设计了潜艇舱壁的结构形式和结构参数。优化的结果可以为舱壁结构参数选择提供理论依据。     

UUV外形和总体布局分析

The construction and shape of UUVs are described in the paper.UUV design is the shape of the overall design of unmanned underwater vehicle should first be resolved UUV underwater vehicle directly affects the shape of the resistance and noise,which is related to energy,payload,maneuverability and concealment UUV problem The main characteristic and parameter tables for foreign torpedo shape,flat shape and anomalous shape are also given in the paper.The general layout of typical foreign UUVs is analyzed in detail.And the total layout figure and interior constructive figure are introduced.Torpedo-type because of its good water power and low noise,no one has been the main form of underwater vehicle-like,and many designers are now highly favored because of its stable performance,anti-environmental interference capability.Other irregular shapes designed primarily for the completion of a specific task,according to the specific environment and mission requirements.According to comparing and summarizing,some suggestions and conclusions are presented.