The fan-noise is classified according to the noisy source, some of the schemes of noise integration control and reduction are puts forward in this paper.
阐述了局部通风机噪声的分类，产生这些噪声的原因，以及综合控制、减小这些噪声的方法。
Experiment result shows, adopt to incline fan tongue for reduction corn combine gain machine fan noise, raising efficiency have very important meaning.
结果表明，采用倾斜蜗舌对降低谷物联合收获机风机噪声、提高效率有十分重要意义。
The reduction of the noise and airflow pressure dropped in the fan of 4ZTL-1800 rice combine harvester threshing prior to cutting should be paid attention.
气吸式4ZTL-1800割前摘脱稻（麦）联合收获机的吸运风机的能耗和噪声一般都较大。
The technology principle, construction and design calculation of resistance noise reduction for HD6 5 1 big power local ventilation fan developed recently are discussed in this paper.
介绍了新研制的HD 651型大功率局部通风机成功降噪的阻性消声技术原理、结构和有关计算，并应用在通风机上进行实际检测。
Tip load reduction prop fan blade design would be benefit to lowering the noise level as well as to the prop fan efficiency improvement.
桨扇叶尖区采用卸荷设计有利于降噪及提高效率。
Tip load reduction prop fan blade design would be benefit to lowering the noise level as well as to the prop fan efficiency improvement.
桨扇叶尖区采用卸荷设计有利于降噪及提高效率。
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