噪声与振动控制

噪声与振动控制 ›› 2014, Vol. 34 ›› Issue (3): 47-51.DOI: 10.3969/j.issn.1006-1335.2014.03.010

• 2.振动理论与数值解法 • 上一篇    下一篇

笔记本电脑风扇散热系统低噪声流场优化设计

赵天，张建润，林潘忠   

  1. （ 东南大学  机械工程学院，  南京  211189 ）
  • 收稿日期:2013-07-26 修回日期:2013-08-14 出版日期:2014-06-18 发布日期:2014-06-18
  • 通讯作者: 赵天
  • 基金资助:

    高档数控机床与基础制造装备重大专项;江苏省产学研联合创新基金

Optimization of Low-noise Airflow Field of Laptop’s  Thermal System

  • Received:2013-07-26 Revised:2013-08-14 Online:2014-06-18 Published:2014-06-18

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摘要：

对笔记本电脑散热系统的噪声进行测试分析，得到各部分噪声的特性，确定风扇出口噪音是主要噪声源，建立风扇转速与笔记本电脑出口处噪声的关系。通过散热系统的流场分析，发现散热翅片出口夹角影响散热系统冷却风的风量和风压，而对噪声的影响不大，由此提出优化散热翅片出风角，提高散热效率，从而降低风扇转速，达到减低散热系统噪声的目的。实验表明出风口优化后，风扇转速可降低16.8 %，散热系统噪声下降2.0 dB（A）。

关键词: 声学, 散热系统, 偶极子模型, 翅片设计, 流场优化, 低噪声

Abstract:

By measurement of a laptop thermal system, the noise characteristics are obtained. The fan outlet is confirmed as the major noise source. Mathematical relationship of the fan rotating speed and noise of the fan outlet is set up. Through simulation of the airflow field, fin arrangement angle is found out effected to the outflow quantity and pressure, but much less effected to the noise. The fin is redesigned, which leads to a big increase of the cooling efficiency, so that the fan rotating speed is decreased, as a result noise of the thermal system is lowed. The experimental results show that the rotating speed can get a reduction of 16.8 % and noise is 2.0 dB(A) lower than the original one.

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