- 积分
- 133
- 注册时间
- 2006-1-10
- 仿真币
-
- 最后登录
- 1970-1-1
|
要求很简单:0 `1 ?1 G K' I1 @2 |
( n1 E; m% c; `& ~' G
1 . 一个标题1 m4 U8 r+ C; J+ c2 w, D
2 . 一个原因(简单在哪里?说明简单设计的原理). p3 i D( C: ]; z" f% k8 \
3 . 一张图片 . a5 ^% ~- S" i( Y: `1 `3 `
% p/ B. C, z" G9 F$ Z举例:- |" D7 m/ h/ x* u3 z* t4 I5 r: f7 p( h
6 {3 z6 {$ B# S3 s$ D+ G
==========================================================
$ X f, K. B! y% K5 K9 p) v2 z" n7 |% a; Z P/ H- c0 C
1 . 标题: 小螺丝的大作用 : @3 G) Q* \1 D9 V4 c
2 . 原因: 标准紧固件,简单的设计,不简单的用途6 `9 v* U% ~8 N* S* g; Q
3 . 图片: 有3张 9 i' G: g* L3 q
2 d2 g8 E9 p) n7 K
" k( {) v' Q. w2 j6 a1 l
/ c; f4 n6 s$ V4 f5 }% ZThe screw is basically an inclined plane wrapped around a cylinder.
# S6 j; }& N. W" |! WIn an inclined plane, a linear force in the horizontal plane is 3 l4 u( Q" d& L6 U9 H, b. s
converted to a vertical "lifting" force. With a screw, a rotary force% ?8 E/ ^- \3 ?
in the horizontal plane is converted to a vertical "lifting" force.
$ U7 \9 @* J; b8 S( o) o( t, R
) o# b5 h9 J6 M. Z: z4 Z2 w8 ZWhen a wood screw is turned, the threads of the screw push up on the wood.6 ]* G( v/ P3 w: m% f3 W
A reaction force from the wood pushes back down on the screw threads and 5 l7 e& Y0 u* p; h+ a; M
in this way the screw moves down even though the force of turning the screw; W+ h/ i8 q/ \1 b3 d. f; T1 X* }: T
is in the horizontal plane. --- The Simple is best. |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有账号?注册
×
|