Results of identification and analysis show that main noise source of the model GZ6921 bus is cooling fan.

识别及分析结果表明，冷却风扇噪声是GZ 6921型客车的主要噪声源。

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Through measurement and analysis of sound signals, the trouble source can be accurately detected and its type analyzed under strong noise environment.

通过检测及分析声音信号，可以在强噪声环境下准确地探测到故障源并分析出其故障类型。

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Analysis of the system's main source of noise.

分析了系统中噪声的主要来源。

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