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alffer1

  • one year 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
    • one year ago
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    Here is a rough sketch of the problem, with included dimensions.

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

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

  4. alffer1
    • one year 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
    • one year 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
    • one year 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
    • one year 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
    • one year ago
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    Consider posting the original question.

  9. alffer1
    • one year 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
    • one year ago
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    If you have a camera, upload the image.

  11. alffer1
    • one year ago
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    ok in proceso.

  12. alffer1
    • one year ago
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    Ok I got it:

  13. LastDayWork
    • one year ago
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    @Mashy

  14. LastDayWork
    • one year ago
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    @Vincent-Lyon.Fr @douglaswinslowcooper @Garm

  15. LastDayWork
    • one year ago
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    @UnkleRhaukus

  16. LastDayWork
    • one year 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
    • one year ago
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    ^^ @alffer1

  18. alffer1
    • one year 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
    • one year ago
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    It's not an external force; take a closer look at the diagram.

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

  21. alffer1
    • one year 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
    • one year 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
    • one year 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
    • one year 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
    • one year ago
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    ok awesome this actually makes sense now. just needed to figure that out.

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

  27. LastDayWork
    • one year ago
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    Yea, ask away

  28. alffer1
    • one year ago
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    http://openstudy.com/study#/updates/52db802ee4b003c643a003f5

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