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Hey all! In the following problem I need to draw the freebody diagram of the cylinder an determine the magnitudes of AC and CD:
The hydraulic cylinder is subjected to three forces. An 8 kN force is exerted on the cylinder at B that is parallel to the cylinder and points from B toward C. The link AC exerts a force at C that is parallel to the line from A to C. The link CD exerts a force at C that is parallel to the line from C to D. I'll include the image in the comments.
 2 months ago
 2 months ago
Hey all! In the following problem I need to draw the freebody diagram of the cylinder an determine the magnitudes of AC and CD: The hydraulic cylinder is subjected to three forces. An 8 kN force is exerted on the cylinder at B that is parallel to the cylinder and points from B toward C. The link AC exerts a force at C that is parallel to the line from A to C. The link CD exerts a force at C that is parallel to the line from C to D. I'll include the image in the comments.
 2 months ago
 2 months ago

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alffer1Best ResponseYou've already chosen the best response.0
Here is a rough sketch of the problem, with included dimensions.
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
I need the free body diagram. I can figure it out from there.
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
Attempt to draw it yourself first; and I'll correct it :)
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
Ok here is what I got, but it makes no sense to me. There must be normal forces somewhere but I'm not sure where to put them:
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
I think the three forces are themselves normal forces (or tension; whatever you are used to call them).
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
Wait wha........but i'm still missing forces in order to balance aren't I? as it is now point C should be moving upward. There must be some force keeping it down right?
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
Honestly, I don't know how this arrangement will work (or what purpose it is used for). As we are using rods (instead of strings), the tension will change its direction from compressional to extensional (or viceversa) to keep the point C in equilibrium.
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
Consider posting the original question.
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
This question is coming out of my textbook so I'm not sure how to get it from the page to here.
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
If you have a camera, upload the image.
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
@VincentLyon.Fr @douglaswinslowcooper @Garm
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
Took some time, but I think I understand it now. (Note that the arrows indicate force vectors.) Try to find how I chose between compressional and extensional tension? Also, find where does Fex comes from?
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
ok yeah I'm looking at it now. I understand where everything is coming from except the Fex. the problem doesn't say anything about an external force being applied...
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
It's not an external force; take a closer look at the diagram.
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
I used the term Fex in the same sense as "...Cats are liquid" :D
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
ok let me see if I understand the diagram: the forces in each of the rods causes a reaction force at the other points. The liquid in the cylinder is compressed causing a reaction force from the liquid?
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
There is also a string attached to the hydraulic cylinder. The hydraulic part only involves the fact that we can convert a weaker force into a stronger one; simply by changing the area on which the force is applied.
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
OHHH so the tension in the string pulling backwards is what is causing Fex? and it's equal and opposite to the 8000 N force?
 2 months ago

LastDayWorkBest ResponseYou've already chosen the best response.1
For more on hydraulics; read  http://en.wikipedia.org/wiki/Hydraulic_drive_system. "...OHHH so the tension in the string pulling backwards is what is causing Fex?..." Yes "...it's equal and opposite to the 8000 N force?..." You can do the (vector) addition yourself as I am a very lazy guy :D
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
ok awesome this actually makes sense now. just needed to figure that out.
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
Could you take a look at one quick question?
 2 months ago

alffer1Best ResponseYou've already chosen the best response.0
http://openstudy.com/study#/updates/52db802ee4b003c643a003f5
 2 months ago
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