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Found 10 results

  1. Hello, I'd like to perform a plane analysis of a rotor component. Usually in ansys I used to use Plane182 elements. Is there any corresponding element type for Optistruct? I tried to find it in the user help and tutorials but I wasn't successfull. I'd appreciate your help. Best regards Jakub
  2. Hi, I've set up my topology optimisation to minimise the volume fraction and believe everything is set up correctly. However when I try to run it I get the following error message: 'Unknown beamsection data type "part_InitLengtangeLength" found in file.' Does anyone know why I might be seeing this and how I might resolve it? Thanks, Luke
  3. Hello, Inertia Relief analysis is the analysis of unconstrained structure e.g. a plane in flight. The applied loads are balanced by a set of translational and rotational accelerations (automatically determined by the solver) instead of reaction forces (as with "classic" boundary conditions). To define inertia relief, please define SUPORT instead of SPC in the constraints menu. The degrees of freedom are the same as with SPCs. You can also define param inrel -2 in the control card section to automatically determine accelerations on the model for force balance. A description of inertia relief can be found in the help: <PATH>/hw13/help/hwsolvers/hwsolvers.htm?loads_and_boundary_conditions.htm or in the Basic OptiStruct tutorials OS-1030: 3D Inertia Relief Analysis using OptiStruct Best Regards Jan
  4. Hi, This should (hopefully) be a quick Q&A. I have a surface (2-D meshed shell elements) and would like to apply a force constraint to the nodes on the mesh of this surface. My only wish is that the vector of the force constraint be perpendicular to the surface (like constant compression or tension at all points of the surface). Does anyone have experience in this? I was told equations might be where to start but I'm not entirely sure how to utilize that as I'm fairly new into exploring anything other than constant loads. I've attached an image file for better reference of the surface. Thanks! Dylan Stelzer
  5. Guest

    Error 4001

    I am trying to run an NLGEOM analysis of a 3-point-bending experiment and I get this message some 15 minutes after starting it: *** ERROR # 4001 *** Running RADIOSS starter, 1 ERROR and 0 WARNINGs have been detected. They are listed below. STARTER ERROR: ERROR id : 727 ** ERROR IN MEMORY ALLOCATION ERROR ALLOCATING TABLE BUFFSG : NLGEOM subcase 1, starter finished Is there any place where I could have access to what the error codes (4001, 727, etc) mean? It's probably just lack of experience from my side, but those messages don't really help me pinpointing the error. Thank you Gustavo Blazek
  6. Hi, a bit of a broad question here but I thought I'd ask one long one rather than many short ones when I inevitably get stuck at the next step! I'm a university student that's new to HyperWorks. I’ve never had any training nor does anyone else at my university know how to use it but I do have access to all the tutorials, however they are obviously simpler than what I’m trying to do so any help would be very much appreciated. I want to conduct a topology optimisation on the central wing of a twin fuselage aircraft with the skin being non design space and the entire internal volume being design space. I'd like to run the optimisation three times, for three separate load cases so that I can get three different internal layouts. I've imported a hollow CAD model, 2D meshed it's surfaces, 3D meshed it's volume and set the boundary conditions for all the nodes on both ends. I've also made collectors for the three different loads, two different boundary conditions (for the torsion load only one end will be fixed) as well as for the properties of carbon fibre reinforced plastic. I'm planning on using the load collectors to make the three different load cases and then use loadsteps to separate the three cases. The part I'm stuck at is how to approach setting the loads. For the pressure load I want to apply six different patches of uniform pressure along the upper and lower surfaces of the wing's chord to simulate the pressure distribution around it. I then want to set a force with a vertical and horizontal component to represent the weight and drag of the payload it's carrying (the aircraft is Virgin Galactic's White Knight Two). Finally I want to apply a moment about one of the ends whilst the other is fixed in order to simulate a difference in pitching moments between the two fuselages. A particular problem I'm having is how to apply the force and moments to entire surfaces rather than individual nodes, as in rather than applying a certain load to individual nodes I want to distribute the force / moment over all the nodes on that surface. I've already spent hours trying to teach HyperWorks to myself but any advice you could give me or any resources you could point be towards would be hugely helpful! I've attached a number of screenshots to try and show you what I'm trying to do. Thanks for taking the time to read this, Luke
  7. Hi, I'm a university student doing a topology optimisation using HyperMesh and OptiStruct. I've imported my part from an ACIS file and meshed it using 2D automesh and volume tetramesh. I'm now trying to fix both ends of the wing (it's the central wing of the twin fuselage aircraft WhiteKnightTwo, see screenshot) with 0 degrees of freedom but when I choose surfaces on the constraints option it only shows a single constraint in the middle of the surface whereas I want to constrain the entire area of the surface. Can anyone help? Thanks, Luke
  8. Hi, I've checked the forum and found another post on this but what was expressed in that thread was an older version and it seems the answers may have changed. I basically am having a problem with some of my solid TRIA elements and their numbering. Currently, I'm getting an error that says, " *** ERROR #2502 *** Element 2369226 had innocent node numbering sequence and needs renumbering." which was repeated twice. If anyone has any advice or help, that would be much appreciated! Also, it mentions something along these lines, " Note: Please import the model into HyperMesh and export it. This will fix the problem related to the incorrect node numbering. Another option is to use PARAM, RENUMOK." which I tried and didn't find much success on (There isn't even an option for PARAM, RENUMOK in the control cards in version 13.0). Dylan Stelzer
  9. Hi, Does anyone have a good step by step method of combining multiple components and their loads? I understand the concept of first creating a 2-D shell and then a 3-D (for me, tetra) mesh to finalize a component. My specific problem is that I am trying to simulate fluid flowing through a solid (like a pipe of water through a cube). My partner does the CAD, and he gave me two IGES files of the components (one being fluid, the other being metal). The IGES files for both are just the "shell" surfaces for the two. I imported both geometries and began meshing. I created a 2-D mesh for the fluid, and one for the metal. Then I went to do tetramesh for each. I used the option "per-volume-component" to create a solid mesh for the fluid and the metal separately. If I wanted to specify a constraint on the fluid shell nodes but needed it to interact with the shell and solid elements of the metal...how would I go about that? Does it do it automatically? This is where I'm stuck, so if anyone has any advice or can direct me to some help, I'd really appreciate it! Thanks. Dylan Stelzer
  10. Hi, Would anyone have any answers as to why the OSSmooth version of my model is creating errors for itself with respect to the conduction interface? I had an original version of HyperWorks 13.0 and never had a problem with OSSmooth and when I had to uninstall and download it again, I started getting errors whenever I tried to use OSSmooth on my models. I've attached some pictures below to help give some context to the problem as well as the error but if anyone has any suggestions or needs more background to the problem, I'm more than willing to attach the entire model file or fill you in on the specifics (properties, boundary conditions, etc. etc.). Any help would be really appreciated! Thanks. Dylan Stelzer
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