風扇葉不對稱的設計功用

風扇葉不對稱設計目的主要作用是減低噪音, "The blades of the fan are arranged on the circumference indifferent distances to each other. This avoids excitation of vibrations withhigh amplitudes and thus reduces noise, as the resonance frequencies of singleblades also are different from each other."

這樣的，真是不明白何解這樣設計

http://item.taobao.com/item.htm?spm=a230r.1.14.22.wcA8TB&id=39421026422&ns=1#detail

冇可能，你睇錯啫，或者斷葉，但會震到冇朋友。