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ÄÁÅÙÃ÷ | contents |
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½ºÅ͵ð | study |
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´ÜÀ§È¯»êÀ» Çϴµ¥¿ä. |
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±Û¾´ÀÌ : Keil °íÀ¯ID : Keil
³¯Â¥ : 00-00-00 00:00
Á¶È¸ : 8375
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10 ftÀÇ ³ôÀÌ¿¡¼ 10 tonÀÇ »óÀÚ¸¦ ¶³¾î¶ß·È´Ù. Áö¸é¿¡ ´ê±â Á÷ÀüÀÇ ÃÖ´ë¼Óµµ´Â 6ft/s¿´´Ù. À̶§ ¿îµ¿¿¡³ÊÁö [(ft){lbf)¸¦ ±¸Ç϶ó.
10 ton -> lbmÀ¸·Î ȯ»ê
10 ton ¦¢ 1000kg ¦¢ 2.20 ldm
----------------------------- = 2.20 * 10©ù lbm
¦¢1 ton ¦¢ 1kg
¿îµ¿¿¡³ÊÁö = (1/2)mv©÷
=> (1/2) * (2.20 * 10©ù) *( 6©÷) lbm¡¤ft©÷ / s©÷
lbm¡¤ft©÷ ¦¢ (s©÷) (lbf)
=> ---------------------------------
s©÷ ¦¢32.174 (ft)(lbm)
=> [(1/2) * 2.20 * 10©ù * 6©÷ ]/32.174 = 12308 (ft)(lbf) °¡ ³ª¿À´Âµ¥
´äÀÌ ÀÌ°Ô ¾Æ´Ï¶ó°í Çϳ׿ä. Áß°£¿¡ ¹» »©¸Ô¾ú³ª¿ä?
-------------------------------------------------------------------
u = k * [¬ä/ ¥ñ]^(1/2)
¬ä = ¿ø°ü¿¡¼ÀÇ Àü´ÜÀÀ·Â (N/m©÷)
¥ñ = À¯Ã¼ÀÇ ¹Ðµµ (kg/m©ø)
u = À¯¼Ó (m/s)
k = »ó¼ö
Àü´ÜÀÀ·ÂÀ» lbf/ft©÷, ¹Ðµµ¸¦ lbm/ft©ø, À¯¼ÓÀ» ft/s À¸·Î ³ªÅ¸³»¾î¶ó.
¬ä N ¦¢0.225 lbf ¦¢ (1m)©÷
-------------------------------- = ¬ä¡Ç
m©÷ ¦¢ 1N ¦¢ (3.28 ft)©÷
¥ñ kg ¦¢ 2.20 lbm ¦¢ (1m)©ø
-------------------------------- = ¥ñ¡Ç
m©ø ¦¢ 1kg ¦¢ (3.28 ft)©ø
¬ä/ ¥ñ => [ (3.28 * 0.0225)/2.20 ] * [¬ä¡Ç/¥ñ¡Ç]
¿©±â¼ Áº¯ÀÇ [ft/s]¿Í ¸ÂÃß±â À§ÇØ.....
ft *lbf ¦¢ 32.174 (ft) (lbm)
¬ä¡Ç/¥ñ¡Ç=> ------------------------------ = 32.174 (ft©÷ / s©÷)
lbm ¦¢ (s©÷) (lbf)
u = k [¬ä/ ¥ñ]^(1/2) => u¡Ç= {(32.174 * 3.28 * 0.0225)/2.20 }^1/2 [ft/s]
ÀÌ·¸°Ô ÇØÁà¾ß Çϳª¿ä?
¾Æ´Ô, ÀÌ¹Ì È¯»êÀÌ ³¡³°Å¶ó
u¡Ç= [(3.28 * 0.0225)/2.20 ] * (¬ä¡Ç/¥ñ¡Ç)] ^1/2
= 0.183 k(¬ä¡Ç/¥ñ¡Ç)^1/2
¶ó°í ÇÏ¸é µÇ´Â°Ç°¡¿ä?
°¨»çÇÕ´Ï´Ù...^^ ÁÁÀºÇÏ·ç µÇ¼¼¿ä...^^
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