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  • Users: iboby
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  1. iboby

    Modeling Unbalance force in solid rotating shaft

    I am working on a rotating shaft with an unbalanced disk. The center of unbalanced disk is located on the mid-span of the shaft with offset=r_shaft. I used SOLID186 to model the shaft. I defined one mass point (MASS21) on the center of the shaft in APDL to model the disk. I know that the...
  2. iboby

    Applying surface force on solid cylinder in APDL

    I used SURF154 and the deformation is that I expected, but it works well when solving for small displacement, but in case of nonlinear static analysis solution was not converged, is there any limitation in NLGEOM analysis for this element? I set KEYOPT(2)=1 and the rest options are as default...
  3. iboby

    Applying surface force on solid cylinder in APDL

    Thank you so much Shu. It was quite helpfull.
  4. iboby

    Applying surface force on solid cylinder in APDL

    I did so, I applied the equivalent force on the target nodes. ANASYS gave me an error and was closed suddenly. Is there any way to properly apply force to the large number of nodes over a surface?
  5. iboby

    Applying surface force on solid cylinder in APDL

    I am trying to apply surface force on lateral surface of solid cylinder in vertical direction on my working plane, but not normal to the surface (pressure).I wonder how can I load my model in static test?
  6. iboby

    Placing an Unbalance Mass on Hollow Shaft

    I am modelling a rotating shaft by SOLID 186 with an unbalance mass locating on mid span of the shaft. How can I model the unbalance mass(force) applying to the hollow shaft? I tried to use CONTACT/TARGET element to locate the mass(MASS 21) on the shaft axis but the results were erroneous. In my...
  7. iboby

    Calculating and Applying Transient Unbalance Load

    Hello, I am modeling a rotating shaft with an unbalance force due to an eccentric disk at the middle by APDL. The rotation is prescribed as: omega(time)=A1*cos(pi*time/T1)/2 My questions are: 1-How should I calculate the unbalance force resulted by this rotation in transient analysis? I tried...
  8. iboby

    Normalized Mode Shapes

    Thank you so much. It was really helpful!
  9. iboby

    Normalized Mode Shapes

    I am working on a spatial vibration project in which I need to extract the resultant normalized mode shapes in vector form. (e.g for a system with 6 D.O.F a eigenvector with 6 components.) Is there any option in ANSYS to extract the mode shapes in such format?
  10. iboby

    Multiple Spherical Joint

    Your advise was very useful and I simulate my model again according to that. I applied SOLID186 with very high YM and LINK 180 for the srings. The frequencies are : 1-437 [Hz], 2-437, 3-437, 4-719, 5-758, 6-795 and except for the forth and sixth the rest are identical to my MATLAB ones but I...
  11. iboby

    Multiple Spherical Joint

    Thank you very much Meshpats. I am expecting that the result of natural frequencies (6 natural frequencies and their mode shapes match my MATLAB results. So I would like to ask how can I attach each three links at one node in way that each to be able to rotates about the three coordinate axes...
  12. iboby

    Multiple Spherical Joint

    I would like to ask you about one of my problem which I am working on it related to my M.Sc thesis. I am simulating a cylinder or a rectangular prism attaching to 12 springs ( I applied LINK for the springs) and these springs are attached to the body at four point (at each point there are 3...

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