Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. powerplay123

    Vibration Analysis of a Wooden Beam in Planing Machine

    URGENT: ANSYS is still solving. I don't know whats going on here but the program is still working and the "solution files" are getting bigger and bigger. The output window displayed "Solution is done!" several times but then it keeps on working. Is it correct as it is?
  2. powerplay123

    Vibration Analysis of a Wooden Beam in Planing Machine

    Hi Everybody, I'm currently working on a simulation model based on ANSYS for a workpiece (beam) in a woodworking machine. Since this is my first ANSYS project I need some help to find some mistakes and optimize my code. You can find attached my current model. The model (geometry) is...
  3. powerplay123

    Modal analysis of a wood beam

    static analysishttp://files.engineering.com/getfile.aspx?folder=d34ad792-85e4-4961-9fd5-b289cad3e5a8&file=static.txt
  4. powerplay123

    Modal analysis of a wood beam

    I made a static and transient analysis as you recommended. However, I don't know how to interpret the results of the static analysis and see whether the contact elements are working properly or not. What I can definitely see is that the KN stiffness of the steel element underneath the wooden...
  5. powerplay123

    Modal analysis of a wood beam

    I'm struggling finding the right parameters for the contac52 contact elements! I want kn, ks and possibly REDFACT to be determined so that the wooden beam is able to move (slide) on the steel desk and completely break the contact (lift off) without having penetration on the rigid steel desk...
  6. powerplay123

    Modal analysis of a wood beam

    I tried to do a statical analysis (please see the attached file). However, I dont know how to interpret this solution in regards to the point you made in your last comment. Also, is there a way in ansys modelling to visualize the rigid links (the mpc184 parts)? Especially when you want to plot...
  7. powerplay123

    Modal analysis of a wood beam

    OK I get your point. But if you take a look at the model (attached file) and let it animate you will see that it looks like even the nodes that are not in contact with the table get pulled. Or is this only the influence of the friction? I generally wanted to the table element to act as...
  8. powerplay123

    Modal analysis of a wood beam

    Thanks very much! I could fix that and it works now. But what I saw is that the *do loop from above sets contact elements that connect the nodes from the upper layer of the table with ALL overlying nodes of the beam. Is that appropriate? I was thinking the contact elements have to be set up...
  9. powerplay123

    Modal analysis of a wood beam

    I think its too complicated to specify the gap direction or normal directions (nx,ny,nz); instead, I tried to make sure that there is a geometric gap in the interface. So i set the gap 1e-5 in the real constant definition. However, I still get the error: *** ERROR ***...
  10. powerplay123

    Modal analysis of a wood beam

    Okay I made some adjustments: As u suggested I defined redfact 10e-12 and also I reduced the value of kn to 10e6 to increase the stability. But how can i specify the normal direction at this point. I thought I can take the default values since there is table on which the beam is positioned is...
  11. powerplay123

    Modal analysis of a wood beam

    If the including the nnear function are the problem then i could basically do it without too. Since I've determined the coincident nodes from ET1 and ET2 from my excel spreadsheet I could theoretically enter every contact pair manually if that would help.
  12. powerplay123

    Modal analysis of a wood beam

    OK I think I implemented everything so far but it doesnt run. Here are the errors and warnings: *** WARNING *** CP = 3.469 TIME= 03:02:51 Both solid model and finite element model boundary conditions have been applied to this model. As solid loads are...
  13. powerplay123

    Modal analysis of a wood beam

    Can u explain very briefly the function and how this macro works please? And where are the node numbers saved and how can i use those numbers DIRECTLY when I want to implement the contact elements.... I'm very sorry for all ur inconvenience but I really need some help to meet my deadline. Thanks
  14. powerplay123

    Modal analysis of a wood beam

    kan123 man i'm really struggling with writing the macro with vba on excel. I generated a list (see attached file) but could not figure out a way to write the macro with vba even though i'm a good c++ programmer. Please can anybody show me how to do that without using matlab? I'm really getting...
  15. powerplay123

    Modal analysis of a wood beam

    I know my contact element definition must look as follows or very similar: ET,2,CONTAC52 R,2,10e10, ,1,0, , , MP,MU,2,0 KEYOPT,2,3,1 KEYOPT,2,4,1 ! to have the gap size determined by the node location also i defined an area which is supposed to represent the table. i set the density of that...
  16. powerplay123

    Modal analysis of a wood beam

    I tried to set a table as a rigid element to constrain the beam in negative y-direction. I'd say its not a big challenge to implement a rigid body as the table with appropriate dof constraints, but the problem is to couple that rigid element adequately with the beam. The table in the bottom is...
  17. powerplay123

    Modal analysis of a wood beam

    Okay, so you are suggesting to position a fixed and inelastic element where the table would be and relate that element to the table somehow, right? The way I make a element fixed would be through appropriate DOF contraints. So that would mean to constrain pretty much all DOF for the table...
  18. powerplay123

    Modal analysis of a wood beam

    Thank you very much for your help so far. I'm trying to simulate the vibration of the wooden beam which is excited by a planning tool with a particular Newton Force and a specific frequency. The excitation should take place at different places of the beam and also the experiment should be done...
  19. powerplay123

    Modal analysis of a wood beam

    Hi guys, the following is my apdl code: /PREP7 ET,1,SOLID45 MP,EX,1,0.789e9 MP,EY,1,1.365e9 MP,EZ,1,0.289e9 MP,GXY,1,0.053e9 MP,GYZ,1,0.474e9 MP,GXZ,1,0.543e9 MP,NUXY,1,.31 MP,NUXZ,1,.4 MP,NUYZ,1,.03 MP,dens,1,450 ! MODELING K,1,0,0,0 K,2,0.1,0,0 K,3,0.1,0.1,0 K,4,0,0.1,0 A,1,2,3,4...

Part and Inventory Search

Back
Top