内部结构对充水膨胀腔消声器声学性能的影响
Influence of the Internal Structure on the Acoustic Performance of the Mufflers with Water-filled Expansion Chamber
龚京风 1杨积壮 1宣领宽 1江致远 1郑文利1
作者信息
- 1. 武汉科技大学 汽车与交通工程学院,武汉 430065
- 折叠
摘要
结构声耦合效应对充水消声器的声学性能具有重要的影响,利用频域有限元法,结合二维轴对称结构声耦合数值模型分析消声器内部声场,研究消声器内部插入管和环形挡板对膨胀腔水消声器声学特性的影响.数值研究表明:结构声耦合效应会使传递损失的通过频率和峰值频率向低频移动,并压缩消声频段;插入管的结构声耦合效应导致传递损失曲线出现明显峰值,这与插入管的固有模态有关,增加插入管长度时,其一阶固有频率降低,峰值消声频率向低频移动,这有利于低频噪声的衰减;对比双级膨胀腔消声器,挡板会提高低频消声量,挡板厚度会对低频消声量产生明显的影响,但挡板的位置对低频消声量影响不大.
Abstract
Structural acoustic coupling effect has an important influence on the acoustic performance of water-filled silencers.The frequency domain finite element method(FEM)combined with the two-dimensional axisymmetric acoustic-structure coupling numerical model is used to analyze the acoustic field inside the muffler.Influences of the circumferential tube and axial annular baffle on the acoustic characteristics of the muffler with the water-filled expansion chamber are studied.It is found that the structural acoustic coupling causes the passing frequency and the peak frequency of the transmission loss to move to the low frequency side and compresses the attenuation frequency band.Compared with the muffler with the double-stage water-filled expansion chamber,the axial annular baffle leads to an increase in the amount of noise elimination in the low-frequency band.The baffle thickness has a significant impact on the noise elimination in the low-frequency band,but the position of the baffle has small impact on it.
关键词
声学/水消声器/内部结构/结构声耦合/传递损失/插入管/环形挡板Key words
acoustics/water muffler/internal structure/acoustic-solid interaction/transmission loss/circumferential tube/annular baffle引用本文复制引用
基金项目
国家自然科学基金青年基金(51909197)
船舶振动噪声重点实验室项目(6142204200305)
出版年
2024
国家科技期刊平台
NSTL
万方数据