【菜鳥成長記】20歲后,，我在機械的每一天

apmc111

加油,，貴在堅持，希望你五年后還能來一篇總結(jié)

黑森林的鹿

apmc111 發(fā)表于 2016-3-28 21:05
& f; \; v" y6 C3 S$ o9 F* ^加油,，貴在堅持，希望你五年后還能來一篇總結(jié)

恩恩,，會一直堅持下去的,！感謝關(guān)注！
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swj1234

可以
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黑森林的鹿

【20160329】VelocityAnalysis

Velocity analysis : determination of velocity in a linkage.
$ D% r5 i6 p, A9 x- b4 _& {速度分析：決定構(gòu)件速度的分析,。

' |* M0 b$ j: z- oTwo common analysis methods：
Relative velocity method
Instantaneous center method
兩種常用方法：相對速度法和速度瞬心法,。
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Relative velocity: the velocity of one object is related to that of another reference object, which can also be moving.
) Z# D) E9 v6 a( G3 ]相對速度：兩個均運動的桿件之間相對的運動速度。
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! n# b9 l" D0 j# D" OVA = absolute velocity of point A
VB/A= relative velocity of pointBwith respect to A
$ t7 v4 e) C( h; Z; K3 {& R相對速度的一些記法,。
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Instant center: a instantaneous pivot point about which the particular link instantaneously appears to be in pure rotation.
速度瞬心：在運動的瞬時可看做是旋轉(zhuǎn)中心的點,。

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黑森林的鹿

【20160330】Acceleration Analysis

) M6 k- m; _& |2 q7 Y* V7 H9 {Tangential acceleration 切向加速度

9 a0 u& A. ^! g( |* oNormal acceleration 法向加速度
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  G7 K( z! o. C3 W$ {Total acceleration 和加速度

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' I0 r3 l' U, }2 r! c  J; F1 JRelative motion: the difference between the motion of two points.
相對運動：兩點運動的差（矢量）。
Relative acceleration: the acceleration of one object as observed from another reference object that is also moving.
- S' a; K5 e# a* _/ U5 q2 w相對加速度：一點相對于運動的另一點的加速度,。
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% R0 P( @: Y! K6 n' wCoriolis Acceleration 科氏加速度
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The magnitude of the Coriolis component:

Both the relative linear velocity and the absolute angular velocity can be determined from a thorough velocity analysis.
! H- [! w. x3 s* _計算科氏加速度的量可以從運動學(xué)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.
7 P, R( B2 O7 c% vAs 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.
' z0 \$ L( \0 Q( Z, ^" K6 y發(fā)動機中控制閥門進排氣的凸輪。應(yīng)用彈簧使桿件與凸輪保持接觸,。
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The unique feature of a cam
) f& h! t2 [" HCams 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.
5 `: ?1 z8 e9 A" N: z& u+ K凸輪的特點：凸輪可實現(xiàn)一般桿件不能或難于實現(xiàn)的功能,。
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however1241

又來看樓主了，樓主還在更新著,。

黑森林的鹿

【20160401】Type of Cams
# k! D$ w" G0 L  t7 V凸輪分類

Plate or disk cams
0 V( Y, ]9 w* P) vThis type of cam is formed on a disk or plate.
0 y! f6 T. z1 C$ qThe radial distance from the center of the disk is varied.
8 J% |! r6 \) a0 m. m, U平面凸輪：在平面內(nèi)形成的凸輪,，與中心的徑向距離是變化的。
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3 N- S: R) d3 P* G% D. ]' \Cylindrical or drum cams
6 m: J1 G, t( gA 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.
圓柱凸輪：柱體上刻有凹槽,，沿軸向變化分布,，從動件被限制在凹槽內(nèi)，因此沿軸向運動,。
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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.
線凸輪：在板內(nèi)刻有線型凹槽,，從動件運動垂直于板的傳動方向。


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however1241

however1241 發(fā)表于 2016-4-1 18:18
8 g+ {/ |' f8 o. x: }又來看樓主了,，樓主還在更新著,。

, E  K+ [$ W+ o& a' w老鷹版主會鼓勵吧。

劉星宇

同大二,，啥專業(yè)基礎(chǔ)課都沒學(xué),，就搞機械創(chuàng)新，深深體會到無知,，學(xué)起更有動力,、更有興趣，還有,，不帶手機去上課,，就成功了一半，共勉