第 35 卷第 6 期
哈 尔 滨 工 程 大 学 学 报
Vol.35 №.6
2014 年 6 月
Journal of Harbin Engineering University
Jun.2014
点源模型在旋转声源声场计算中的推广应用
付建,王永生
(海军工程大学 动力工程学院,湖北 武汉 430033)
摘 要:针对螺旋桨、喷水推进器、风扇等旋转机械,研究了基于点源模型的旋转声源负载噪声频域预报方法。 结合点源
模型理论,将旋转声源离散为均匀分布在运动轨迹上的有限个固定声源,各声源间时域的迟滞时间转换为频域的相位
差,所有点声源声场的总和即为旋转声源的声场。 结合自由空间旋转点源和旋转力源声场仿真计算,验证了旋转声源离
散方法的准确性;计算分析了不同半径、不同频率旋转声源对离散点数的要求;以单个螺旋桨叶片为对象,提出了叶片表
面旋转力源按声场网格离散和分块离散的方法,并验证了离散方法的有效性,为点源模型在旋转声源声场中的推广应用
提供了前提。
关键词:点源模型;旋转声源;负载噪声;离散点数;离散方法
doi:10.3969/ j.issn.1006-7043.201304020
网络出版地址:http:/ / www.cnki.net / kcms/ doi/ 10.3969/ j.issn.1006-7043.201304020.html
中图分类号: O42 文献标志码:A 文章编号:1006-7043(2014)06-0719-06
Extended application of the point source model for
the acoustic field solution of the rotating source
FU Jian, WANG Yongsheng
(College of Marine Power Engineering, Naval University of Engineering, Wuhan 430033, China)
Abstract:In order to forecast the noise of circumvolve machines such as propellers, waterjets or pumps, the method
of the point source model is studied to predict the loading noise of the rotating source in the frequency domain. The
rotating source can be replaced by finite stationary sources distributing along the rotating trace, and the time differ-
ence between sources can be transformed into phase differences in the frequency domain. The sound field of the ro-
tating source is equal to the summation of all of the point sources. The veracity of the discretization method is vali-
dated by the freedom sound field simulation of the rotating point source and rotating force source. And the require-
ment of the number of discrete points of the rotating source with a different radius and frequency is analyzed. Final-
ly, taking the single propeller blade as the object, two discretization methods of blade rotating force are put forward.
One method is to take each acoustic mesh as a single force source, and the other method is to divide the blade into
segments and each segment can be taken as a single force source. The validity of these discretization methods has
been validated, which can provide the precondition for the extended application of the point source model for the
sound field calculation of the rotating source.
Keywords:point source model; rotating source; loading noise; discrete point number; discretization method
收稿日期: 2013-04-04. 网络出版时间:2014-05-14 15:48:54.
基金项目:国家自然科学基金青年基金资助项目( 51209212)
作者简介:付建(1985-),男,博士研究生;
王永生(1955-),男,教授,博士生导师.
通信作者:付建,E-mail: fujain_hgd@ 163.com.
以离心泵、螺旋桨等为代表的旋转机械在舰船
上应用广泛,旋转机械的共同特点是其主要做功部
件(叶轮)噪声对应为旋转声源声场。 文献[1-4] 推
导了简单旋转点声源声场的解析解;文献[5-9]利用
点源理论分析了管道内旋转声源声场的数值解。 本
文在借鉴前人研究的基础上,将点源模型推广应用
到任意边界条件下旋转声源频域声场的数值计算,
能够较为真实的模拟幅值、相位随时间变化的旋转
声源声场特性。
1 旋转声源的离散方法
将每个旋转声源(点源或偶极源) 离散为沿旋
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