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Re: [請益] 阿搜哩

[ Mechanical ]32 留言, 推噓總分: +18

作者: waters5566 - 發表於 2012/10/02 23:43(11年前)

21^F推ntust661:純推咖哩咖哩~~!!!!10/04 15:13

[請益] 關於蜻蜓的飛行器的可能性

[ Mechanical ]10 留言, 推噓總分: +3

作者: linkin1118 - 發表於 2012/09/09 14:35(11年前)

4^F→ntust661:太難了= =09/09 15:15

[請益] 光陽生產製程技術人員

[ Mechanical ]5 留言, 推噓總分: +2

作者: ZXC0919 - 發表於 2012/08/14 22:18(11年前)

1^F推ntust661:碰運氣阿!08/14 22:26

[請益] 晉茂車刀

[ Mechanical ]3 留言, 推噓總分: +2

作者: s4300026 - 發表於 2012/08/14 12:03(11年前)

1^F推ntust661:問東問西不買正常阿@@...08/14 12:25

[請益] 台中價格合理的線切割公司(論文用)

[ Mechanical ]42 留言, 推噓總分: +16

作者: hot770727 - 發表於 2012/08/10 11:21(11年前)

15^F推ntust661:怎麼可能沒工錢阿 = = ，如果估價都只估材料費誰想做阿XD08/10 22:19

[請益] 請問台清大今年使用的哪位作者的原文書呢

[ Mechanical ]25 留言, 推噓總分: +10

作者: toy21343 - 發表於 2012/08/10 03:53(11年前)

10^F推ntust661:有興趣絕對不成問題!!08/11 14:11

[請益] 方螺紋為何機械效率比較高?

[ Mechanical ]25 留言, 推噓總分: +8

作者: finals - 發表於 2012/08/09 17:23(11年前)

13^F推ntust661:基本上庫倫摩擦是與面積無關的08/09 23:40

[請益] 將腳踏車的動力傳給果汁機

[ Mechanical ]4 留言, 推噓總分: +1

作者: ej001 - 發表於 2012/07/11 23:55(12年前)

1^F推ntust661:鏈輪接攪拌機?07/12 19:59

[請益] 流力問題

[ Mechanical ]15 留言, 推噓總分: +3

作者: study093 - 發表於 2012/06/22 16:03(12年前)

1^F推ntust661:1.這個問題很好流線函數用Cauchy Riemann eq.表示的話06/23 01:28

2^F→ntust661:代表你隱含了流體不可壓縮 ▽‧u = 006/23 01:29

3^F→ntust661:你想想看你那樣定義 u = dψ/dy , v = -dψ/dx06/23 01:30

4^F→ntust661:就是為了讓 ▽‧u = 006/23 01:30

5^F→ntust661:可是這題給你 u , v 。你算 ▽‧u ≠ 006/23 01:32

6^F→ntust661:所以不能用 Cauchy Riemann eq.06/23 01:32

7^F→ntust661:2.此題的重點在 time rate of change06/23 01:33

8^F→ntust661:是 DT/Dt06/23 01:33

12^F推ntust661:打 rate of change 你就要告訴我你往哪個方向的變化06/23 14:15

13^F→ntust661:題目問你 rate of change of temperature ...06/23 14:16

14^F→ntust661:並不是 ▽T 喔!06/23 14:16

15^F→ntust661:你要找的不是gredient,是 directional derivative06/23 14:17

[請益] 斷面為三角形的最大剪應力

[ Mechanical ]44 留言, 推噓總分: +11

作者: pomelo999 - 發表於 2012/06/08 09:11(12年前)

1^F推ntust661:你的梁是受純彎矩嗎? 我先假設他是不然中性軸就不是06/08 14:04

2^F→ntust661:形心軸了06/08 14:04

3^F推ntust661:抱歉我誤會你的意思了= =06/08 14:11

12^F推ntust661:我實際計算過之後正三角形樑 △ 受到垂直向下剪力 V06/09 01:01

13^F→ntust661:最大剪應力的確不會落在中性軸06/09 01:02

14^F→ntust661:說實在的中性軸與最大剪應力似乎無直接關係06/09 01:03

15^F→ntust661:中性軸只不過是個纖維不會被拉長或變短的地方06/09 01:10

16^F推ntust661:我在想，那些中性軸有最大剪應力這個定論06/09 01:12

17^F推ntust661:只是純粹因為圓形長方形都剛好在形心軸而已06/09 01:14

18^F→ntust661:(我剛剛查了一下中性軸剪應力不一定最大)06/09 01:15

22^F推ntust661:我在想，重點在於剪應力公式當中還有寬度 b 這個參數要06/09 10:44

23^F→ntust661:考慮06/09 10:44

24^F推ntust661:τ = K Q(s) = K ∫ y dA06/09 10:48

25^F→ntust661:dτ/ds = K d/ds (∫ y* w(y) dy ) , 上限 s , 下限 h06/09 10:49

26^F→ntust661:w(y) 為寬度函數， dA = w(y) dy06/09 10:50

27^F→ntust661:故 dτ/ds = K w(s) s = 006/09 10:51

28^F→ntust661:w(s) = 0 , 或者 s = 0 , 寬度不可能為零06/09 10:51

29^F→ntust661:所以 s = 0 , s = 0 代表在中性軸上06/09 10:53

34^F推ntust661:恩!06/11 22:11

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