Step four: the main frequency spectrum of the acoustic analysis.

步骤四：进行该声波主要频谱的分析。

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Analyze the distribution of internal noise and main frequency ingredient with different speed.

分析了不同车速工况下车内噪声的分布状况及主要频率成分。

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From the calculating results, the main frequency of rail and sleeper lateral vibration is low.

从计算结果可知，轨道结构的横向振动频率较低，且钢轨与轨枕的横向振动主频相接近。

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The photovoltaic panels generate electricity when exposed to sunlight and are connected to the building's power supply via an inverter synchronised to the electricity main's frequency.

BBC: Solar power for City Works centre in Gloucester

There are two main methods of creating a single-frequency network.

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On channel boosters quickly receive the OTA signal from the main tower and retransmit the signal on the same frequency.

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