• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Environment and Engineering >Improvement in the Source Localization Accuracy using a Microphone Array Adjacent to the Main Flow of Wind Tunnel
【24h】

Improvement in the Source Localization Accuracy using a Microphone Array Adjacent to the Main Flow of Wind Tunnel

机译：使用与风洞主流相邻的麦克风阵列提高源定位精度

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, we propose a method to improve source localization accuracy in a wind tunnel test by using a microphone array. On the basis of a model of the acoustic path passing through a free shear layer, we installed the microphone array adjacent to the main flow to avoid refraction and dissipation in the free shear layer. Flow-induced noise due to the interference with the main flow is reduced effectively by calculating the cross spectrum between the respective outputs of two pairs of 2-D microphone arrays. The effects of these techniques are verified by the acoustic performance test using a standard source device with wind exposure. It was found that this calculation method is effective even at a uniform wind velocity of 300 km/h and enables acoustic measurements adjacent to the main flow. Accurate noise source localization can be achieved by installing the microphone array along an extended line from the sidewall of the wind tunnel nozzle. Compared with the conventional microphone array installed outside of the main flow, the estimation error of convection distance due to the expanding free shear layer is improved from 60 mm to approximately 10 mm at a main flow velocity of 300 km/h.
机译：在这项研究中，我们提出了一种通过使用麦克风阵列来提高风洞测试中源定位精度的方法。根据通过自由剪切层的声路径模型，我们在主流附近安装了麦克风阵列，以避免在自由剪切层中发生折射和耗散。通过计算两对2-D麦克风阵列的各个输出之间的互谱，可以有效地减少由于干扰主流而引起的流噪声。这些技术的效果通过使用带有风的标准声源设备的声学性能测试进行了验证。结果发现，该计算方法即使在风速为300 km / h的情况下也是有效的，并且可以在主流附近进行声学测量。通过沿着从风洞喷嘴侧壁延伸的线安装麦克风阵列，可以实现准确的噪声源定位。与安装在主流外部的常规麦克风阵列相比，在300 km / h的主流流速下，由于扩展的自由剪切层引起的对流距离的估计误差从60 mm改善到大约10 mm。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号