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  1. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    Ah, yea good point. I suppose that that condition is only valid if no mass is considered.
  2. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    Wow! Thanks a lot for taking the time to do that. I will look through it and see if I can adapt it to the large deflection case. One thing I found a bit ago that may help (not sure yet) is a solution for beam shape under pure moment loading...
  3. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    @zekeman: Thank you for your post. I'll have to work through what you have put down and see if I can make sense of everything. A couple of questions though. Can you point me in the direction of something that describes the stored energy of the beam that you used? I have been having trouble...
  4. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    tylerdawg, I agree with what you have proposed; however, I am not sure about the part with identifying the spring constant. Since it is a large displacement problem wouldn't the equations be nonlinear and I'm not sure that there is a readily available solution for the spring constant.
  5. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    In that case then I would need to resolve the load placed on the mass by the beam into torque and force. The torque part I already know but does anyone know how I would obtain the force load? I suppose I could use the equations obtained from the numerical solution for large displacement beam...
  6. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    Sort of, but more just calculating dynamic response for variable input (torques). It will be part of a larger Simulink model. This is just the portion that I am having trouble accurately describing.
  7. happygopher

    Using Newton's 2nd law for rotation with a moving coordinate.

    I am working on a problem where there is a mass at the end of a slender cylindrical beam as shown in the attached figure. There is a torque load applied to the mass about the Y-axis (on mass's local coordinate system). This produces a deflection in the beam in the direction of the positive...
  8. happygopher

    Orientation dependent loads in cantilever beam problem?

    That is good for making sure that the direction is correct, but I am still unsure of how to define the magnitude of the load force as a function of the beam orientation at various points.
  9. happygopher

    Orientation dependent loads in cantilever beam problem?

    I need some help understanding how to achieve orientation dependent loading. Please see the attached photo for an example of what I am talking about. Basically I would like to be able to define some points, say the free end and the midpoint. At each of these points, the rotation from the...
  10. happygopher

    6-axis load cell force calculation

    OK, I should have realized the simple typo but I have not been looking at this very clearly... Thanks for your help, I will be looking through the data more tomorrow and see if I can make sense of what is happening.
  11. happygopher

    6-axis load cell force calculation

    But aren't you multiplying a torque by a length. So your units are lbf*in^2 (or N*m^2)?
  12. happygopher

    6-axis load cell force calculation

    Sorry if I am being dense, but I'm not sure what is going on with the part of your equation "Y*TorqueZ". If this equation is a sum of forces, what does this term represent?
  13. happygopher

    6-axis load cell force calculation

    The load cell actually measures the three force components and three moments at its origin. If the tip where the load is applied is cantilevered out from the fixed load cell, wouldn't there be no moments applied at the tip? As far as I know these things are fairly common. I've heard of them...
  14. happygopher

    6-axis load cell force calculation

    I feel like I am overlooking something really simple here but I could use your help to restore my sanity. I have some data I collected using a 6-axis load cell. I would like to use this and calculate the resultant load force applied to the tool tip. Am I correct in wanting to use the 3 force...

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