| 孙宗翰,田杰,张效溥,欧阳华.电子器件散热风扇气动噪声管道声学模态截止控制技术[J].,2020,39(2):199-206 |
| 电子器件散热风扇气动噪声管道声学模态截止控制技术 |
| Aerodynamic noise control technology of electronic device cooling fan based on duct acoustic mode cutoff |
| 投稿时间：2019-06-17 修订日期：2020-02-26 |
| 中文摘要: |
| 本文针对电子器件散热用的一款变速轴流风扇的气动噪声及其降噪方法进行实验研究。首先利用风扇旋转轴等高平面内圆周分布的传感器阵列测量风扇不同转速下远场噪声分布，总声压级与转速的对数关系验证散热风扇主要气动噪声属于偶极源噪声，频谱分析显示离散单音噪声为主要噪声影响因素。基于管道声学理论的管道模态截止方法，研究进出风口安装圆形短管对风扇气动噪声的影响，实验结果显示不同位置不同长度的短管对风扇远场噪声影响不同。额定转速下，在进风口安装2 cm管道可以使远场1 m处平均总声压级下降4.1 dB(A)，降噪效果显著。模态测量结果显示，此种情况下对应离散单音处的风扇主要模态幅值大大降低，风扇离散单音噪声降低从而噪声总声压级大幅减小。该方法为散热风扇降噪提供了一种新的途径。 |
| 英文摘要: |
| An experimental study on the aerodynamic noise and noise reduction method of a variable-speed axial flow fan for electronic device heat dissipation is conducted. The far-field radiation noise at different rotational speed is measured by a microphone array uniformly distributed along the circumference in the contour plane of the fan axis. The logarithmic relationship between the total SPL and the rotational speed verifies that the main aerodynamic noise of the fan belongs to the dipole source noise, and the spectrum analysis indicates that the discrete tonal noise is the dominant noise. Based on the duct mode cutoff in duct acoustic theory, the effects on the aerodynamic noise of installing a circular short duct at the inlet and outlet of the fan are studied, pointing out that the short ducts with different lengths on the different sides have different effects on the far-field noise. At rated fan speed, installing a 2 cm duct at the inlet can reduce the average total SPL by 4.1 dB(A) at the far field of 1 m, which is significant. Mode measurement results show that in this case the main mode amplitude corresponding to the discrete tone is greatly reduced, and the reduction of discrete tonal noise leads to a significant reduction of the total SPL. This method provides a new way for cooling fan noise reduction. |
| DOI：10.11684/j.issn.1000-310X.2020.02.004 |
| 中文关键词: 散热风扇,降噪,管道模态截止,频谱分析 |
| 英文关键词: Cooling fan, Noise reduction, Duct mode cutoff, Spectrum analysis |
| 基金项目: |
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