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Development of Waterproof Low-frequency Windscreen with Extended Noise Reduction

机译：扩展了降噪功能的防水低频挡风玻璃的开发

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As is often experienced, windnoise behaviour on the microphone seems somehow different from those following hydrodynamics or aeromechanics. Based on the preliminary investigation, prototype windscreen was developed for ultralow-frequency noise from wind-generated power facilities or heat-pomp water heater (EcoCute). The performance was discussed and examined from the concentrated viewpoints: (1) reduction of wind noise, (2) insertion loss and (3) water-proof/dew-condensation prevention capability, all about the outermost layer of the screen, as well as the possibility of extending the wind noise reduction by numerical or physical approach. The result implies items (1)-(3) deeply depend on the shape and material of the screen and, above all, the insertion loss on microphone mounting condition inside the screen as well. The new windscreen exhibits around 30 dB reduction below 1kHz, and insertion loss less than ±2dB in 1 Hz-20 kHz. Furthermore, in six-month observation on (3), water leak or dew condensation inside the screen was not found even under the local downpour of 30.5mm/h recorded in July 2010 at Miyazaki, Japan. Finally, numerical compensation by mounting two microphones inside and outside the windscreen, as well as physical approach of employing additional independent wind barrier, both indicated the possibility of additional 10-15dB (45 dB or more in total) reductions each.
机译：正如通常所经历的那样，麦克风上的风噪行为似乎与流体动力学或气动力学的行为有所不同。在初步调查的基础上，开发了原型挡风玻璃，用于处理来自风力发电设施或热泵热水器（EcoCute）的超低频噪声。从集中的角度对性能进行了讨论和检验：（1）减少风噪声，（2）插入损耗和（3）防潮/防结露功能，均围绕屏幕的最外层以及通过数值或物理方法扩大风噪声降低的可能性。结果表明，项（1）-（3）很大程度上取决于屏幕的形状和材料，最重要的是，还取决于屏幕内部麦克风安装条件的插入损耗。新的挡风玻璃在1kHz以下显示出约30 dB的衰减，在1 Hz-20 kHz下的插入损耗小于±2dB。此外，在对（3）进行的六个月观察中，即使在2010年7月日本宫崎县录得的每小时30.5mm / h的局部倾盆大雨的情况下，筛网内也未发现漏水或结露。最后，通过在挡风玻璃的内部和外部安装两个麦克风进行数值补偿，以及采用额外的独立挡风玻璃的物理方法，都表明每个都可以再降低10-15dB（总计45dB或更多）。

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