Jump to content

DWerner

Members
  • Content Count

    4
  • Joined

  • Last visited

About DWerner

  • Rank
    Newbie

Profile Information

  • Gender
    Male
  • Country
    Germany
  • Are you University user?
    Yes

Recent Profile Visitors

758 profile views
  1. I hava a quite large FE model of a gearbox containing several compontents that are connected via freeze contacts and bolts and rigids. My goal is to genarate a reduced order model for RecurDyn. Hence, I modelled it in HyperMesh with a CMS Mode Analysis Case with the Parameter RFIOUT set to Yes. However, everytime I let the simulation run with OptiStruct I see that in the out file the Modal Analysis has been calculated and also the modes of the condensed system are there. But then the program stops with the error message *** ERROR # 6409 *** The RecurDyn library returned with an error. I tried quite a lot of changes to the model. In some cases it can write the rfi file, in others not, doesnt seem logical. My problem is that this error message is not very helpful as I dont have any idea what it could really mean. Different computers ended with the same error message. Does anyone know where I could find more about this error code?
  2. Hallo everybody, I would like to export the calculated Eigenvectors at each Node and the Eigenvalues to a txt-File that can be read by Excel. I already know the function "EIGVSAVE", but this only allows the export into a file with a binary optistruct format. So is there a way to request the export into an "Excel-friendly" format?? Thank you a lot in advance!
  3. Hi, thank you for your quick answer! I attached some pictures of the model, I hope that helps understanding my problem. I also made a Test-Model that originally served to check wether my modelling concept leads to reasonable results, I can be downloaded here: https://www.dropbox.com/s/dr9fjisk3m0g8p2/DWerner_Testmodell_AssemblyArea_Beam.hm?dl=0 As the nets are quite simple, I had no problems creating an area-connector in this model, but when it came to adopting this to the gearbox-housing, I couldn't achieve creating this connector anymore. Are there some ways to remesh the flange area in a manner that creates a really flat and smooth mesh? Maybe this could help? Model_Gearbox.pdf Example_Screw_flange.pdf Elements flange-area.pdf
  4. Dear Members, my problem is the following: I want to calculate the frequency modes of a gearbox-housing that consists of two parts screwed with a flange, using OptiStruct as solver. A validated approach that I want to try is modelling the screws as a bar-element that connects two mpc-rigids, one in the thread-area an the other in the area of the screw-head. The problem that I have is the connection of the two meshes (3D-parabolic with tetra-elements) of the parts in the flange-area. Simply connecting the whole flange leads to unsatisfactory results so that I just want to connect the flange areas in a certain radius auround the axis of the screw. My first idea was using the area-connector to create rigid-elements, but I still have problems to understand, how it works and if its even possible to do it in that manner. When I select "elems" in the location-botton of the area-panel and "rigid" as type no area-connectors are created independent of every other option chosen. Using "node list" leads to really strange connections and its hardly possible to even achieve a creation of some connections. Does anyone have an indea of a different approach connecting the flange-areas? As far as I know defining a contact is not possible for a modal analysis due to linearity. Thank you very much in advance!!
×
×
  • Create New...