風扇的出風孔的遮罩，不同形狀產生噪音的差異
source link: https://blog.gslin.org/archives/2022/09/26/10891/%e9%a2%a8%e6%89%87%e7%9a%84%e5%87%ba%e9%a2%a8%e5%ad%94%e7%9a%84%e9%81%ae%e7%bd%a9%ef%bc%8c%e4%b8%8d%e5%90%8c%e5%bd%a2%e7%8b%80%e7%94%a2%e7%94%9f%e5%99%aa%e9%9f%b3%e7%9a%84%e5%b7%ae%e7%95%b0/
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風扇的出風孔的遮罩，不同形狀產生噪音的差異
前幾天在 Hacker News Daily 上看的文章：「Effects of grill patterns on fan performance/noise (2011) (pugetsystems.com)」，原文在「Effects of Grill Patterns on Fan Performance/Noise」。文章在講電腦風扇的出風口擋板的樣式對噪音的影響。這是一篇 2011 的老文章，但看了一下好像沒有什麼新資料...
出風口的遮罩在有些地區似乎是法律要求，主要是怕小朋友手指戳進去，以及成年人不小心碰到，所以就會有專門的測試項目在跑：
I remember back in 2000 ish I worked in R&D of a PC manufacturer and had to check the new PSUs and cases with a 'Test Finger' to make sure all the holes were small enough. The test finger was really expensive IIRC.
但回到這篇的重點，噪音與風量的差異，所以基準值是拔掉遮罩的部份先測試 (所以可以知道最低的噪音與最大的風量)，然後上各種遮罩測差異。
Mesh 增加的噪音是最少，但風量有點差：
Wire 增加的噪音也很少，風量也達到最高：
從倒數的方向來看，Turbine 是最吵風量也最少的：
其實意外發現比較差的遮罩增加的噪音不算少，把很多風的動能變成聲音的能量了...
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