船舶振动声学优化设计中设备运动激励的等效反演力方法  

Equivalent excitation force inversion method in ship vibration and acoustics optimization

作　　者：易跃峰 杨德庆[1] 刘西安 陈林 YI Yue-feng;YANG De-qing;LIU Xi’an;CHEN Lin(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Marine Design&Research Institute of China,Shanghai 200011,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]中国船舶与海洋工程设计研究院,上海200011

出　　处：《计算力学学报》2022年第4期397-403,共7页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(51479115)资助项目。

摘　　要：当设备振动载荷以运动激励形式给出时,常采用大质量法或直接加速度法进行结构动力响应分析。但基于这两种方法的动力学模型无法用于船舶振动模态分析以及振动声学优化设计迭代过程中的动力学重分析。本文基于动力设备内源激振力的不变性,提出等效反演力法,将设备运动激励转换为设备等效内源力载荷,用于船舶水下辐射噪声的预报以及结构声学优化设计。以某舱段为例,对比分析了不同加载方法对应的动力学模型的固有频率与水下辐射噪声声功率,实测水声声功率为92.33 dB,基于等效反演力法输入的水声声功率数值计算结果为93.84 dB,两者相差1.51 dB。研究表明,等效反演力法是在振源设备载荷以运动激励给定时计算水下辐射噪声并用于声学优化设计的优选方法。When excitation loads are given as vibrational accelerations, it’s common that Large Mass Method and Direct Acceleration Method are used to compute structural dynamic responses in engineering.However, these methods cannot be used in natural frequency analysis and structural dynamic re-analysis during optimization iterations.According to the inherent invariability of excitation force of equipment, an Equivalent Force Inversion Method is proposed to predict underwater acoustic radiation and conduct the structural acoustic optimization.Taking a ship cabin as an example, the sound power of underwater acoustic radiation for the test and the computation based on the proposed equivalent inversion force is 92.33 dB and 93.84 dB,respectively.Meanwhile, structural vibration and acoustic radiation before and after structural acoustic optimization are compared through different loading methods.It shows that Equivalent Force Inversion Method is the preferred method for dynamic loads in the prediction and optimization of underwater acoustic radiation.

关 键 词：等效反演力法 振动加速度 水下辐射噪声 加速度载荷 声学优化设计 

分 类 号：U661[交通运输工程—船舶及航道工程] O32[交通运输工程—船舶与海洋工程]