Skip to main content

Defining Ansys Superelement SUB File Manually

Photo by  James Owen  on  Unsplash A surprisingly popular blog-post written here is Exporting Stiffness Matrix from Ansys . A sensible follow up question is what can one do with the exported stiffness matrix? In a recent Xansys Forum post, a question was raised on how we can edit the stiffness matrix of a superelement and use it for our model.  An approach presented below is to first create a superelement that has the same number of DOF and nodal location that will serve as a template. An APDL script can then be written to edit the stiffness matrix entries as desired before exporting to a new superelement *.SUB file for use in future models. The self-contained script below demonstrates this.  /prep7 et ,1, 185 mp , ex, 1, 200e3 mp , prxy, 1, 0.33 w = 0.1 ! single element (note nodal locations) n , 1, w, -w, -w n , 2, w, w, -w n , 3, -w, w, -w n , 4, -w, -w, -w n , 5, w, -w, w n , 6, w, w, w n , 7, -w, w, w n , 8, -w, -w, w e , 1, 2, 3, 4, 5, 6, 7, 8 /solu antype , substr     ! analy

Torsional Spring in ANSYS Workbench

Torsional springs can come in handy when inertia plays a large role in the dynamic response. Fortunately a simple snippet converts a typical linear spring into a torsional spring. Workbench uses COMBIN14 springs by default.

keyopt, _sid, 3, 1   ! rotational DOF about spring axis
r, _sid, 0.01        ! rotational stiffness

Torsional Mode due to Torsional Spring

One could also specify the radial stiffness of the spring above by specifying the direction. Note that KEYOPT(2)=1.
keyopt, _sid, 2, 1 ! UX direction about global axis
r, _sid, 1e5            ! Translation stiffness

Same goes for off-axis rotational DOF via KEYOPT(2)=4.
keyopt, _sid, 2, 4 ! ROTX direction about global axis
r, _sid, 1e5            ! Rotation stiffness


The Workbench (v18.2) Archived File: LINK

Comments

  1. 3d isometric flat vector touchdown page template of on-line gambling platform for live poker, roulette, slot machine and dices, web on line casino. Players shouldn't take away winning wagers or place new bets till all winners have been paid. After the roulette desk is cleared, the supplier proclaims, "Place your bets," signaling the 토토사이트 beginning of model new} game.

    ReplyDelete

Post a Comment