【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
. G" E8 ]/ y0 W8 d& t加油，貴在堅持，希望你五年后還能來一篇總結(jié)

3 D: a/ U6 t6 w恩恩，會一直堅持下去的！感謝關(guān)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.
# E' F( H$ h! V( }/ a3 i速度分析：決定構(gòu)件速度的分析。
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2 r* n( k$ n* t. d4 UTwo common analysis methods：
Relative velocity method
4 U) G# `: m: n( a3 tInstantaneous center method
: S8 m% E6 S* D* F; l* V兩種常用方法：相對速度法和速度瞬心法。

+ t  h9 _" l! }Relative velocity: the velocity of one object is related to that of another reference object, which can also be moving.
相對速度：兩個均運動的桿件之間相對的運動速度。

# D8 ^# E! A7 NVA = absolute velocity of point A
VB/A= relative velocity of pointBwith respect to A
相對速度的一些記法。

Instant center: a instantaneous pivot point about which the particular link instantaneously appears to be in pure rotation.
- \( E# Y. e5 |9 \* k4 D% b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
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Tangential acceleration 切向加速度
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& S% P9 ~. E/ u& T! VNormal acceleration 法向加速度
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Total acceleration 和加速度

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7 N' ?& G+ q4 w1 M; sRelative 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.
相對加速度：一點相對于運動的另一點的加速度。

Coriolis Acceleration 科氏加速度

" @7 X8 V" Q# i7 [4 ZThe magnitude of the Coriolis component:

$ r- m% s) {+ nBoth the relative linear velocity and the absolute angular velocity can be determined from a thorough velocity analysis.
計算科氏加速度的量可以從運動學(xué)分析中得到。

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黑森林的鹿

【20160331】Cams: Design and Kinematic Analysis



2 X! N- O8 Y0 o$ R2 w3 gThe camshaft is driven by the engine.
! z( T( X1 D: d  J& ?& S0 sAs the cam rotates, a rocker arm drags on its oblong surface.
: `0 `: G5 U& v5 K; J1 l* lThe 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.
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。

The unique feature of a cam
3 Y/ h) k$ g5 M/ T; \1 eCams 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.
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。

however1241

又來看樓主了，樓主還在更新著。

黑森林的鹿

【20160401】Type of Cams
凸輪分類
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% s* f$ B/ m3 gPlate or disk cams
This type of cam is formed on a disk or plate.
+ D0 }- x( L! xThe radial distance from the center of the disk is varied.
5 l: b9 M& T$ C# u- B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。

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.
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。

9 d, H* M/ w  b% s9 m  Z" L6 `Linear cam
% z0 D4 O' z0 |3 nA 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
; N/ f7 L* {7 X# H又來看樓主了，樓主還在更新著。

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