【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
% E; ?" V4 W8 R加油，贵在坚持，希望你五年后还能来一篇总结

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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! g+ u& v6 Z! {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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. W( X' p3 H+ {) B5 u6 mTwo common analysis methods：
, }- O! I* v! B9 W; {Relative velocity method
Instantaneous center method
; d: Y6 U: ]  k+ N: U0 Q0 B两种常用方法：相对速度法和速度瞬心法。

Relative 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。

VA = absolute velocity of point A
* r- g0 p3 I3 G- \VB/A= relative velocity of pointBwith respect to A
6 A4 [* ~4 J  W& G( [$ l5 T* U& _相对速度的一些记法。
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9 G0 P( U/ x! ?7 n+ @9 s8 D" n( SInstant center: a instantaneous pivot point about which the particular link instantaneously appears to be in pure rotation.
. Z; H7 H4 {) v/ P' K8 R- O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

9 b% X3 Z; S5 {" `# X: dNormal acceleration 法向加速度

Total acceleration 和加速度
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% _- b+ n7 V' e/ O& _, g5 r/ q4 qRelative motion: the difference between the motion of two points.
* v* g7 F* n4 u0 p* U  u- a相对运动：两点运动的差（矢量）。
9 v) l- E1 G7 ]1 |2 `: g, G% p# SRelative 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。
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' Y/ T* J. }/ ~7 gCoriolis Acceleration 科氏加速度

( t! g# M; s! |0 E2 G9 K2 Z9 rThe magnitude of the Coriolis component:
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& L" X' w/ K' k# gBoth the relative linear velocity and the absolute angular velocity can be determined from a thorough velocity analysis.
: ~/ C8 A* e3 J计算科氏加速度的量可以从运动学分析中得到。
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黑森林的鹿

【20160331】Cams: Design and Kinematic Analysis
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: R% J6 O8 R# j' s3 x" M6 uThe camshaft is driven by the engine.
" b- F: C& G$ X/ U. X% c# I2 PAs the cam rotates, a rocker arm drags on its oblong surface.
The rocker arm imparts a linear, reciprocating motion to a valve stem.
The spring is used around the valve stem. The rocker arm follower needs to maintain contact with the cam surface to achieve the desired motion.
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。
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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.
# u& \& `" B- m) D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
凸轮分类
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  W- g- _7 t/ A  t( B' xPlate or disk cams
9 d; c, f+ e4 UThis type of cam is formed on a disk or plate.
The radial distance from the center of the disk is varied.
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.
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。

Linear cam
A groove is cut into the block with a distance that varies from the plane of translation.
Attaching 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。
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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