The method for fans fault diagnosis by using noise frequency spectrum was described.

探讨利用噪声频谱进行风机故障诊断的方法。

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Controls the fractal noise frequency. Increase this value to increase fractal detail and make it finer.

控制碎片杂色频率。增加这个值会增加碎片细节和使它更精细。

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The function relationship between acoustic intensity of eyelet leak noise frequency section and re was discussed.

探讨了小孔泄漏气体噪声频谱中某一频段声压级与雷诺数之间的函数关系。

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Residents of Waubra, a town near Victoria's biggest wind generator, recently complained that low-frequency noise was causing headaches and earaches.

ECONOMIST: Wind energy and politics

Over the years, the government has taken steps to address the problem, including regulating low-frequency noise like water pumps, and reducing maximum decibels.

BBC: Taiwan's noise pollution dilemma

Its scientific committee said low-frequency ambient marine noise levels had increased in the northern hemisphere by two orders of magnitude over the last 60 years.

BBC: NEWS | Science/Nature | The deafening sound of the seas