【菜鸟成长记】20岁后，我在机械的每一天

apmc111

加油，贵在坚持，希望你五年后还能来一篇总结

黑森林的鹿

apmc111 发表于 2016-3-28 21:05
加油，贵在坚持，希望你五年后还能来一篇总结

+ [# n% D$ H- T& ]+ B恩恩，会一直坚持下去的！感谢关注！

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swj1234

可以

黑森林的鹿

【20160329】VelocityAnalysis
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Velocity analysis : determination of velocity in a linkage.
速度分析：决定构件速度的分析。
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8 }7 r2 W4 a5 m4 rTwo common analysis methods：
Relative velocity method
0 ^: {; G* i! l0 x+ Y& OInstantaneous center method
! W, R6 F; y8 N  w' R两种常用方法：相对速度法和速度瞬心法。
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7 Y0 \5 b6 u' gRelative velocity: the velocity of one object is related to that of another reference object, which can also be moving.
相对速度：两个均运动的杆件之间相对的运动速度。

1 k3 M/ `7 e% EVA = absolute velocity of point A
VB/A= relative velocity of pointBwith respect to A
相对速度的一些记法。
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Instant center: a instantaneous pivot point about which the particular link instantaneously appears to be in pure rotation.
7 g6 L( P* l5 S! V+ \* A速度瞬心：在运动的瞬时可看做是旋转中心的点。
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黑森林的鹿

【20160330】Acceleration Analysis
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Tangential acceleration 切向加速度

2 n- |+ V) g+ v8 e8 ]+ X) `Normal acceleration 法向加速度
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5 B! a8 \! ~9 g2 `& E/ A5 F; u  }; Y" NTotal acceleration 和加速度


* G4 ~' y1 P3 l0 X& BRelative motion: the difference between the motion of two points.
0 V& O& e) {  O4 A/ n" V相对运动：两点运动的差（矢量）。
% J: B5 V$ }" B4 j) eRelative acceleration: the acceleration of one object as observed from another reference object that is also moving.
相对加速度：一点相对于运动的另一点的加速度。

Coriolis Acceleration 科氏加速度

The magnitude of the Coriolis component:
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7 E2 o( o  p% `  z, IBoth the relative linear velocity and the absolute angular velocity can be determined from a thorough velocity analysis.
$ r- _3 i) W7 e, u/ k$ L7 Q计算科氏加速度的量可以从运动学分析中得到。

黑森林的鹿

【20160331】Cams: Design and Kinematic Analysis

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The camshaft is driven by the engine.
% G) J, a! ]; y" r9 I6 b1 Q2 XAs the cam rotates, a rocker arm drags on its oblong surface.
9 G* x, `! h- l. ^" h4 f  tThe rocker arm imparts a linear, reciprocating motion to a valve stem.
0 x; X1 c% R. |* j1 [( EThe spring is used around the valve stem. The rocker arm follower needs to maintain contact with the cam surface to achieve the desired motion.
1 {" A0 D7 U* G( r( q& k0 Y# @1 |发动机中控制阀门进排气的凸轮。应用弹簧使杆件与凸轮保持接触。

The unique feature of a cam
Cams can be used to obtain unusual or irregular motion that would be difficult or impossible, to obtain from other linkages, because the motion of cams can be prescribed.
% b; c* \2 X! R9 i5 U) s2 H9 `7 {凸轮的特点：凸轮可实现一般杆件不能或难于实现的功能。

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however1241

又来看楼主了，楼主还在更新着。

黑森林的鹿

【20160401】Type of Cams
) L1 @6 P9 F& y" a( q" E凸轮分类
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Plate or disk cams
This type of cam is formed on a disk or plate.
2 V/ r+ [9 b" F& ~: ZThe radial distance from the center of the disk is varied.
( m$ ^8 M$ C7 m平面凸轮：在平面内形成的凸轮，与中心的径向距离是变化的。
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Cylindrical or drum cams
A groove is cut into the cylinder, with a varying location along the axis of rotation.
+ A; {' v5 U) p& |The follower is attached to the groove, thus giving the follower motion along the axis of rotation.
圆柱凸轮：柱体上刻有凹槽，沿轴向变化分布，从动件被限制在凹槽内，因此沿轴向运动。
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8 {2 s" l! [3 {6 r( s; m' [Linear cam
% P" G% u$ f" pA groove is cut into the block with a distance that varies from the plane of translation.
, C; j6 g. b# Q$ m" E8 i: T; T$ mAttaching a follower in the groove gives the follower motion perpendicular to the plane of translation.
线凸轮：在板内刻有线型凹槽，从动件运动垂直于板的传动方向。

however1241

however1241 发表于 2016-4-1 18:18
又来看楼主了，楼主还在更新着。

老鹰版主会鼓励吧。
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刘星宇

同大二，啥专业基础课都没学，就搞机械创新，深深体会到无知，学起更有动力、更有兴趣，还有，不带手机去上课，就成功了一半，共勉