| 王芳莹,张三明.两种用于声学缩尺模型的声源研制[J].声学技术,2019,38(6):670~674 |
| 两种用于声学缩尺模型的声源研制 |
| Development of two miniature loudspeaker for acoustic scale model |
| 投稿时间：2018-09-09 修订日期：2018-11-02 |
| DOI：10.16300/j.cnki.1000-3630.2019.06.012 |
| 中文关键词: 无指向性声源 频率响应 缩尺模型 声学试验 |
| 英文关键词: omnidirectional acoustic source frequency response scaled model acoustic experiment |
| 基金项目:国家自然科学基金（51878594） |
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| 摘要点击次数: 739 |
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| 中文摘要: |
| 理想的声学缩尺模型测试用小型无指向性声源，需要具备以下条件：足够小的线度、无指向性辐射、较为平直的高频频率响应以及足够高的测试信噪比，并且能稳定地重复发出受控信号。设计制作了两种线度小于15 mm的小型无指向性声源：导管式点声源和六面体声源，并在简易消声室内测试了其各自的指向性与高频频率响应。测试结果表明，对于1：10的缩尺比例，两种小型无指向性声源的测试信噪比都能达到35 dB以上，无指向性辐射均满足《JJF 1468-2014无指向性声源校准规范》要求。导管式点声源的高频频率响应更为平直，但小型六面体声源在额定功率下具有更高的信噪比。两种声源均可用于建筑声学缩尺模型试验。 |
| 英文摘要: |
| An ideal acoustic source for acoustic scale model test needs to meet the following conditions:small size, omnidirectional radiation, relatively flat high-frequency response, adequate signal-to-noise ratio for test, and stably sending controlled signals. In this paper, two miniature omnidirectional acoustic sources (Conduit Point Acoustic Source and Hexahedral Source) with a size of less than 15mm are developed, and their directivities and high frequency responses are tested in a semi-anechoic room respectively. The test results show that with a scale of 1:10, the signal-to-noise ratio of the two miniature omnidirectional acoustic sources can reach more than 35dB, and their directivities all meet the requirement of omnidirectional radiation according to the "JJF 1468-2014 omnidirectional acoustic source calibration specification". The high frequency response of the Conduit Point Acoustic Source is more flat, but the Hexahedral Source has a greater signal to noise ratio at rated power. Both acoustic sources can be used for acoustic scale model experiments. |
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