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alffer1

  • 11 months ago

Hey all! In the following problem I need to draw the free-body 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.

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  1. alffer1
    • 11 months ago
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    Here is a rough sketch of the problem, with included dimensions.

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  2. alffer1
    • 11 months ago
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    I need the free body diagram. I can figure it out from there.

  3. LastDayWork
    • 11 months ago
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    Attempt to draw it yourself first; and I'll correct it :)

  4. alffer1
    • 11 months ago
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    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:

  5. LastDayWork
    • 11 months ago
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    I think the three forces are themselves normal forces (or tension; whatever you are used to call them).

  6. alffer1
    • 11 months ago
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    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?

  7. LastDayWork
    • 11 months ago
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    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 vice-versa) to keep the point C in equilibrium.

  8. LastDayWork
    • 11 months ago
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    Consider posting the original question.

  9. alffer1
    • 11 months ago
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    This question is coming out of my textbook so I'm not sure how to get it from the page to here.

  10. LastDayWork
    • 11 months ago
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    If you have a camera, upload the image.

  11. alffer1
    • 11 months ago
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    ok in proceso.

  12. alffer1
    • 11 months ago
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    Ok I got it:

  13. LastDayWork
    • 11 months ago
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    @Mashy

  14. LastDayWork
    • 11 months ago
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    @Vincent-Lyon.Fr @douglaswinslowcooper @Garm

  15. LastDayWork
    • 11 months ago
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    @UnkleRhaukus

  16. LastDayWork
    • 11 months ago
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    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?

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  17. LastDayWork
    • 11 months ago
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    ^^ @alffer1

  18. alffer1
    • 11 months ago
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    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...

  19. LastDayWork
    • 11 months ago
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    It's not an external force; take a closer look at the diagram.

  20. LastDayWork
    • 11 months ago
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    I used the term Fex in the same sense as "...Cats are liquid" :D

  21. alffer1
    • 11 months ago
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    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?

  22. LastDayWork
    • 11 months ago
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    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.

  23. alffer1
    • 11 months ago
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    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?

  24. LastDayWork
    • 11 months ago
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    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

  25. alffer1
    • 11 months ago
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    ok awesome this actually makes sense now. just needed to figure that out.

  26. alffer1
    • 11 months ago
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    Could you take a look at one quick question?

  27. LastDayWork
    • 11 months ago
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    Yea, ask away

  28. alffer1
    • 11 months ago
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    http://openstudy.com/study#/updates/52db802ee4b003c643a003f5

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