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）。%Noise of a laptop’s thermal system is tested and analyzed, and the noise characteristics of its different parts are obtained. It is found that the fan’s outlet is the major noise source. Mathematical relationship of the fan’s rotating speed and the noise of the fan’s outlet is established. Through simulation analysis of the airflow field of the thermal system, the fin arrangement angle is found to influence the outflow flux and flow pressure of the cooling wind, but have little contribution to the noise. Thus, the fin arrangement angle is optimized, and the cooling efficiency of the thermal system is raised greatly so that the fan rotating speed can be decreased. As a result, noise of the thermal system is lowed. The experimental results show that the rotating speed can be reduced by 16.8%and the noise can be reduced by 2.0 dB(A) with the same cooling effect after the optimization.
展开▼
