噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
3期
47-51
,共5页
声学%散热系统%偶极子模型%翅片设计%流场优化%低噪声
聲學%散熱繫統%偶極子模型%翅片設計%流場優化%低譟聲
성학%산열계통%우겁자모형%시편설계%류장우화%저조성
acoustics%thermal system%dipole model%fin design%airflow field optimization%low-noise
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）。
對筆記本電腦散熱繫統的譟聲進行測試分析，得到各部分譟聲的特性，確定風扇齣口譟音是主要譟聲源，建立風扇轉速與筆記本電腦齣口處譟聲的關繫。通過散熱繫統的流場分析，髮現散熱翅片齣口夾角影響散熱繫統冷卻風的風量和風壓，而對譟聲的影響不大，由此提齣優化散熱翅片齣風角，提高散熱效率，從而降低風扇轉速，達到減低散熱繫統譟聲的目的。實驗錶明齣風口優化後，風扇轉速可降低16.8%，散熱繫統譟聲下降2.0 dB（A）。
대필기본전뇌산열계통적조성진행측시분석，득도각부분조성적특성，학정풍선출구조음시주요조성원，건립풍선전속여필기본전뇌출구처조성적관계。통과산열계통적류장분석，발현산열시편출구협각영향산열계통냉각풍적풍량화풍압，이대조성적영향불대，유차제출우화산열시편출풍각，제고산열효솔，종이강저풍선전속，체도감저산열계통조성적목적。실험표명출풍구우화후，풍선전속가강저16.8%，산열계통조성하강2.0 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.
