【菜鳥成長記】20歲后，我在機械的每一天

809775354

809775354 發(fā)表于 2016-3-14 13:13
加油，有這樣的認識不錯，努力

我和你差不多，要多學習，一起努力

jhchenguohan

怎么說呢，女性干機械基本面上是劣勢，但是也能找到優(yōu)勢的點，那就是外語優(yōu)勢。機械行業(yè)往往技術(shù)好的外語厲害的極其少。個人建議學好專業(yè)外語比學好專業(yè)課更重要，畢業(yè)以后投簡歷給外資更有優(yōu)勢。

haneast

黑森林的鹿 發(fā)表于 2016-2-5 19:55
求交流

看到樓上說求交往被嚇到了，然后仔細看帖才發(fā)現(xiàn)樓主原來是女生，哈哈，罕見，難得有女生喜歡機械

微光axi

我們學校都是女生比較強，，，

周冒冒

加油

黑森林的鹿

【20160315】Mechanism Terminology
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As stated, mechanisms consist of connected parts with the

objective of transferring motion and force from a power

source to an output. A linkage is a mechanism where rigid

parts are connected together to form a chain. One part is

designated the framebecause it serves as the frame of reference

for the motion of all other parts. The frame is typically

a part that exhibits no motion. A popular elliptical trainer

exercise machine is shown in Figure 1.3. In this machine, two

planar linkages are configured to operate out-of-phase to

simulate walking motion, including the movement of arms.

Since the base sits on the ground and remains stationary

during operation, the base is considered the frame.
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Links are the individual parts of the mechanism. They

are considered rigid bodies and are connected with other

links to transmit motion and forces. Theoretically, a true

rigid body does not change shape during motion. Although

a true rigid body does not exist, mechanism links are

designed to minimally deform and are considered rigid. The

footrests and arm handles on the exercise machine comprise

different links and, along with connecting links, are interconnected

to produce constrained motion.

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Elastic parts, such as springs, are not rigid and, therefore,

are not considered links. They have no effect on the

kinematics of a mechanism and are usually ignored during

kinematic analysis. They do supply forces and must be

included during the dynamic force portion of analysis.

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A joint is a movableconnection between links and allows

relative motion between the links. The two primaryjoints, also

called full joints, arethe revolute and sliding joints. The

revolutejoint is also called a pin or hinge joint. Itallows pure

rotation between the two links that it connects. The sliding

joint is also called a pistonor prismaticjoint. It allows linear

sliding between the links that it connects. Figure 1.4 illustrates

these two primary joints.

A cam joint is shownin Figure 1.5a. It allows for both

rotation and sliding between the two links that it connects.

Because of the complex motion permitted, the cam connection

is called a higher-order joint, also called half joint. A gear

connection also allows rotation and sliding between two

gears as their teeth mesh. This arrangement is shown in

Figure 1.5b. The gear connection is also a higher-order joint.

A simple link is arigid body that contains only two

joints, which connect it to other links. Figure 1.6a illustrates

a simple link. A crank is a simple link that is able to complete

a full rotation about a fixed center. A rocker is a simple link

that oscillates through an angle, reversing its direction at certain

intervals.

A complex link is arigid body that contains more than

two joints. Figure 1.6b illustrates a complex link. A rocker

arm is a complex link, containing three joints, that ispivoted

near its center. A bellcrank is similar to a rocker arm, but is

bent in the center. The complex link shown in Figure 1.6b is

a bellcrank.

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A point of interestis a point on a link where the motion

is of special interest. The end of the windshield wiper, previously

discussed, would be considered a point of interest.

Once kinematic analysis is performed, the displacement,

velocity, and accelerations of that point are determined.

The last general component of a mechanism is the

actuator. An actuator is the component that drives the

mechanism. Common actuators include motors (electric

and hydraulic), engines, cylinders (hydraulic and pneumatic),

ball-screw motors, and solenoids. Manually operated

machines utilize human motion, such as turning a

crank, as the actuator. Actuators will be discussed further in

Section 1.7.

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Linkages can be either open or closed chains. Eachlink in

a closed-loop kinematic chain is connected to two or more

other links. The lift in Figure 1.2 and the elliptical trainer of

Figure 1.3 are closed-loop chains. An open-loop chain will

have at least one link that is connected to only one other

link. Common open-loop linkages are robotic arms as

shown in Figure 1.7 and other “reaching” machines such as

backhoes and cranes.

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% q' I$ X8 W- }/ z7 r% m3 h6 i再次感謝鷹大的支持！本來總覺得自己每天在這冒泡大家會覺得水，畢竟每天浮上來，內(nèi)容又是極其基礎(chǔ)的對大家沒什么參考的東西……各位的鼓勵是對我更好的鞭策！我得更努力學習了吶，爭取早日達到與各位更深入探討的境界！

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黑森林的鹿

jhchenguohan 發(fā)表于 2016-3-15 10:56
( g9 b9 t3 p/ e/ E5 L4 X) {怎么說呢，女性干機械基本面上是劣勢，但是也能找到優(yōu)勢的點，那就是外語優(yōu)勢。機械行業(yè)往往技術(shù)好的外語厲 ...

9 T' o9 S9 f: g$ c" H( u謝謝前輩指點！外語？恩恩，我確實在外語上下了挺大功夫，自己也很喜歡。前輩可否進一步說說都有哪些適合女性的職位呢？管理？銷售？那需要什么層次的專業(yè)知識？謝謝您！
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黑森林的鹿

haneast 發(fā)表于 2016-3-15 11:50
看到樓上說求交往被嚇到了，然后仔細看帖才發(fā)現(xiàn)樓主原來是女生，哈哈，罕見，難得有女生喜歡機械

+ y% T0 q7 C( `) r/ s! t哈哈哈，話說論壇好像不能直接看用戶性別呢~怨念好久了……不過可能如層主所說，女生都沒多少，所以不需要了吧，哈哈！

黑森林的鹿

微光axi 發(fā)表于 2016-3-15 13:03
( w' T1 a" N# j! R) T我們學校都是女生比較強，，，

厲害！然而自問還不能比本班男生厲害……向女同胞們看齊~
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xielifu1

搞技術(shù)，需要從小到大對自然科學知識的積累。干機械這一行，父母是工人，去過工廠，入門就比較快。