Airflow noise in duct should be controlled within the range of standard during duct design.
风道设计中要求风道的气流噪声必须控制在允许的范围内。
Several protective measures have been taken in our experiments so that then the identification of secondary path is insensitive to airflow in the fan duct.
在实验中采用了几项保护措施，使得次级路径的辨识结果对风机管道中空气流动不再敏感。
The experimental result shows that the measurements with microphone are highly sensitive to airflow in the fan duct.
实验结果表明，风机管道中空气流动对传声器测量信号的影响很大。
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