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[請益] 為什麼光碟機伺服控制都用lead lag

[ Mechanical ]3 留言, 推噓總分: +2

作者: lifepass - 發表於 2012/05/14 00:17(12年前)

1^F推ntust661:PID 很麻煩吧 @@... 價格偏高05/14 10:14

[請益] 流體力學常用之無因次參數

[ Mechanical ]24 留言, 推噓總分: +4

作者: laputaplanet - 發表於 2012/04/11 22:32(12年前)

1^F推ntust661:基本上在探討Naviers Stokes eq. 就會做無因次化的動作04/11 22:37

2^F→ntust661:例如講一下最近學到的 Stokes flow04/11 22:37

3^F→ntust661:方程式長這樣 ρ [ Du/Dt ] = - dp/dx + μ▽^2 u04/11 22:38

4^F→ntust661: ρ [ Dv/Dt ] = - dp/dy + μ▽^2 v04/11 22:38

5^F→ntust661:u = U u* , v = U v* , x = L x*04/11 22:40

6^F→ntust661:代換一下就會發現 Re [ Du*/Dt ] = - k dp/dx + ▽*^2 u*04/11 22:41

7^F→ntust661:這時候方程式的化簡就需要無因次參數的幫忙囉!04/11 22:41

8^F→ntust661:因為 Du*/Dt 無量綱 , ▽*^2 u* 也是無量綱04/11 22:43

9^F→ntust661:參數大小直接決定偏微分方程中哪幾項重要哪幾個忽略04/11 22:44

10^F→ntust661:拉回正題，Stokes flow , Re <<1 可想而知Stokes eq. 可04/11 22:44

11^F→ntust661:以簡化成 -k dp/dx + ▽*^2 u* = 004/11 22:45

12^F→ntust661:另外講一下為什麼雷諾數會稱為慣性力與黏滯力的比值04/11 22:46

13^F→ntust661:[ Du*/Dt ] 我們稱為 ineria term04/11 22:46

14^F→ntust661: ▽*^2 u 我們稱為 viscous term04/11 22:47

15^F→ntust661:不考慮壓力梯度的情況下04/11 22:47

16^F→ntust661: Re (inertia term) = (viscous term)04/11 22:48

17^F→ntust661:所以 Re 才會被講成慣性力與黏滯力的比值04/11 22:48

18^F→ntust661:基本上是這樣~如果有說明不好的地方請不吝指正!04/11 22:49

19^F推ntust661:補充一下應該講這是 stokes problem 的東西才對@@04/11 22:52

Re: [請益] 選機械相關的大學

[ Mechanical ]9 留言, 推噓總分: +7

作者: polish - 發表於 2012/04/06 21:26(12年前)

5^F推ntust661:推!04/07 18:04

[請益] Pro_e相關問題

[ Mechanical ]11 留言, 推噓總分: +3

作者: alex1210 - 發表於 2012/04/02 16:59(12年前)

4^F推ntust661:靜止要啟動的瞬間不一定沒有加速度喔!!04/02 21:08

Re: [請益] 物理系想走機械的路

[ Mechanical ]9 留言, 推噓總分: +4

作者: woodsy - 發表於 2012/03/25 19:07(12年前)

1^F推ntust661:推做中學03/25 20:18

[請益] 學習Pro/E的程度廣泛？

[ Mechanical ]5 留言, 推噓總分: +3

作者: chain17 - 發表於 2012/03/20 20:41(12年前)

2^F推ntust661:都加減學吧~03/20 22:19

3^F→ntust661:他也都叫我們做課本內的習題XD03/20 22:20

[請益] 勁度與降伏應力之關係

[ Mechanical ]22 留言, 推噓總分: +2

作者: ooo112233 - 發表於 2012/03/07 15:31(12年前)

1^F推ntust661:你所說的幾何是斷面幾何嗎? 還是什麼呢?03/07 17:57

[疑問] 體積積分法問題

[ Mechanical ]10 留言, 推噓總分: +5

作者: sayurilove - 發表於 2012/03/07 08:39(12年前)

1^F推ntust661:建議把你的解法PO上來這樣一來要修正你的計算過程03/07 18:00

2^F→ntust661:比較容易03/07 18:00

[疑問] 材料力學問題

[ Mechanical ]15 留言, 推噓總分: +2

作者: sayurilove - 發表於 2012/03/07 08:38(12年前)

5^F推ntust661:因為細長梁受彎矩破壞比較容易受剪力破壞比較困難03/07 18:09

6^F→ntust661:所以彎矩最大的斷面稱為危險斷面03/07 18:09

7^F→ntust661:還有釘子那題其實我覺得沒有出很好...03/07 18:10

8^F→ntust661:釘子畫法應該延著梁的軸線方向你這樣畫不對@@03/07 18:10

[請益] 綜合機械問題

[ Mechanical ]3 留言, 推噓總分: +1

作者: sayurilove - 發表於 2012/03/05 19:27(12年前)

1^F推ntust661:3.單位好像錯了@@03/05 22:40

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