| 孙中政,雷坤,王宇飞,韩旭.三通管路管壁声传递损失测试方法[J].,2021,40(1):156-162 |
| 三通管路管壁声传递损失测试方法 |
| Duct wall transmission loss test method of three channels |
| 投稿时间：2020-04-29 修订日期：2020-12-25 |
| 中文摘要: |
| 研发了多通管路管壁传损测试方法。针对某车型的双涡轮增压发动机进气三通管道,评价用塑料代替铝的声学性能。用传递损失评价管道管壁的本身声学性能,管道两个进气端分别用声源两次发生,管道出气端用两不同反射末端,管道内每段管路两个压力场麦克风测试基于平面波分离入射反射波,管道外用声功率半球面十点分布法自由场麦克风测试,通过三次测量计算管道管壁传递损失,传递损失是本身特性,能准确找出塑料和金属件不同频率的差异。用近场全息方法和波速形成进行声源识别,塑料件主要噪声来源是中高频焊缝处薄弱透声和低频结构辐射声。 |
| 英文摘要: |
| Multi-channel duct wall transmission loss test method is researched. Vehicle twin turbo engine multi-channels duct sound property is tested including plastics duct and aluminum duct. Duct wall natural sound property judgement uses transmission loss, two sound sources are used in the turbo engine ducts two inlet pipes and two different reflection terminal condition are used in the outlet pipe; each pipe uses two pressure microphones to get inject and reflect wave based on plane wave, ten free field microphones are ranged as hemisphere sound power test position outside the duct, three times tests with different duct sound source or terminal are done to calculate the transmission loss. Transmission less shows the natural property of duct wall and clearly identify the difference between plastics and metal duct on frequency domain. Near field acoustical holography and beamforming are used to find the sound source of engine duct, plastics duct major noise comes from welding area for entrant sound in high frequency range and duct structure sound radiation in low frequency range. |
| DOI：10.11684/j.issn.1000-310X.2021.01.019 |
| 中文关键词: 多通管道 多模态 传递损失 近场声全息 波束形成 |
| 英文关键词: multi-channels duct multi-modal transmission loss near field acoustics holography beamforming |
| 基金项目: |
|
| 摘要点击次数: 1517 |
| 全文下载次数: 1354 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
