大型客滚船首部砰击引发舱室噪声的数值模拟  

Numerical simulation of the bow slamming induced cabin noise of a large RO-RO passenger ship

作　　者：何丽丝 王德禹[1] HE Li-si;WANG De-yu(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《舰船科学技术》2023年第20期25-31,共7页Ship Science and Technology

基　　金：教育部、财政部重大科研项目(教技函[2013]35号)。

摘　　要：噪声规范中以校核机械振动产生的噪声为主,但高幅值的砰击力周期性地与船体相互作用,已成为船舶首部舱室的重要噪声源,故开展由砰击引发的舱室噪声问题数值模拟研究。以某大型客滚船为例,采用CFD软件STAR-CCM+对船体首部的砰击现象进行数值模拟,编制时域-频域转化程序,并借助声学分析软件VA One,将砰击力作为外载荷计入声学分析模型,获得船体典型舱室内的噪声水平。结果表明,该计算方法能够快速有效地得到由砰击引发的船舶舱内噪声水平。针对某大型客滚船首部区域,每增加一级海况,船体首部由于砰击引发的声压级提高约3 dB左右。该计算流程实现了流体力学与声学计算一体化,给出一种关于砰击现象引发舱室内噪声的数值预报方法,为实船降噪提供了可靠的保障,对相关船型的设计工作具有参考价值。The existing regulation of cabin noise is the noise of this focus due to the mechanical vibration.Since the periodical interaction between the high amplitude slamming forces at the ship bow may be an important noise source of the cabins,numerical investigations on the bow slamming induced cabin noise were conducted.Taking a large RO-RO ship as a computational example,numerical studies were performed by combing the computational fluid dynamics(CFD)and acoustic simulation.The slamming phenomena were simulated using the CFD code STAR-CCM+.The computed time-domain slamming forces were then converted into the frequency-domain using the self-developed signal converter before being substituted into the acoustic analysis as the external excitations.The acoustic simulation yielded finally the noise level of the overall ship hull and some typical cabins.Numerical results show that the sound pressure level caused by the slamming increases about 3 dB with each increment of the sea state level.A numerical prediction method for cabin noise caused by slamming is presented,which provides a useful tool for noise performance analysis of large passenger ships.The presented numerical results are of reference values to the design of related ship types.

关 键 词：砰击 声学分析 计算流体力学 时域-频域转化 噪声评价 

分 类 号：U662.2[交通运输工程—船舶及航道工程]