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批踢踢實業坊 Examination 板

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[問題] 機械原理

May 30th 2014, 06:17, by B9503045

作者B9503045 (捲心酥)

看板Examination

標題[問題] 機械原理

時間Fri May 30 06:17:07 2014

問題:若要使滾珠軸承之壽命增加一倍，則軸承所受負載約應降低原來的多少倍? (A)0.14 (B)0.42 (C)0.61 (D)0.79 答案是(D) 老魯，印象中軸承壽命的公式好像是: L2/L1=(P1/P2)^3 假設原本壽命是 L1=1 負載是 P1=1 若要使 L2=2 則 P2=0.793700526 ，故選(D) 感覺似乎有點怪怪的，想請問高手的正確詳解。感謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 1.162.29.11 ※ 文章網址: http://www.ptt.cc/bbs/Examination/M.1401401829.A.771.html

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