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Found 29 results

  1. I am working on a aircraft model having span of 80 m. What should be the appropriate size of the model so that the meshing can be done ? What size can be handled by HyperMesh without giving 'not responding' problem. This problem of 'not responding' usually comes. Right now, I have scaled it down to 40m and meshing done with element size of 0.05 mm. Very fine mesh created using 'tria' elements. It has to be used in VWT so , tria elements are used. Is the scaling appropriate ? Do I need to scale it down more? Thanks Garima
  2. Guest

    Export Solid

    Can HyperMesh export a solid that can then be imported into Inspire? I have iges data for the surfaces of a part and I have used them to create a solid in HyperMesh. However when I export the new solid geometry all I'm getting are surfaces when I open the file in Inspire.
  3. 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
  4. Hi, I want to assign non-design property to the engines in my aircraft model. As,I realize during optimization run that I don't need the engines to be part of the optimization process. But, I have already done the following steps: 1. All the components are combined as a single solid using Boolean option in HM. 2. Exported the parasolid file and created mesh in 'INSPIRE' and exported FEM from Inspire. 3. Then , extracted faces in HM. 4. Run the model in VWT for CFD. 5. Imported loads from VWT to HM. Is there way, I can put engines in the non-design space now ? OR is there any other way to make the engines to NOT to be part of the Optimization process. I am really short on time. It would be really nice , if somebody can provide support in this context. Looking forward to a timely response. Thank you. Garima
  5. Support Forum, Can anyone help me better understand the definition of Compliance and why we would use it in our models either as a constraint or as an objective function? Should the value of the constraint be a 0 to 1 value or any larger number? Compliance I know is designated as Strain Energy...am I the one choosing the units for that value? Is it better used as a constraint or an objective? If I want to use it in a dual thermal/structural loading model, should I use compliance/temperature as the constraint/objective? I'm really just looking for more help on this. My supervisor is asking a lot of questions about it and I don't have many answers. Any help is greatly appreciated! Thanks. Dylan Stelzer
  6. Hi all, I noticed today in the MAT4 (thermal properties) section of the materials panel that you can change values for k = and H = . I know that k stands for thermal conduction coefficient but does anyone know what the H exactly stands for? I'm not even sure what units might go with it either. I have searched online for material properties that have the symbol H but no such luck. Is it possible that the variable might be Greek but is substituted as H just for this software? Any help or tips on where to find the answer for this would be much appreciated, thanks! Dylan Stelzer [:-D]
  7. Hi all, I have been working on a model lately and it can best be described simply as a 2-D flat plate. I've been running some fairly simple tests just to see how the solver deals with loads applied to a system and how changes in these loads affect the end (optimized) result. One test I've wanted to try yet haven't figured out yet is the linear distributed load across the top plate. Thus far I have only used constant distributed loads (Ex: 50 N force across all of the top edge nodes). When searching through these forums and online, I've heard of two ways of going about this. The first is using the "equation" tab inside the force panel. My model is set up in the (x-direction and y-direction) so I'm not entirely sure how the load should be applied as an equation. I've tried a few equations of my own (x, x^2, and 2*x) but haven't had any luck. The second method (which I heard by word of mouth) was to use Excel in a way that accounts for every node one would apply a load to along with the corresponding value of the force at that node. I know much less about the specific process for this one so if anyone has any direction here, that would be fantastic. All and any advice is welcomed and thank you in advance. Please let me know if you need more details about the model if it would better explain the current situation! Dylan Stelzer [:^D]
  8. Hi, I have another post about this same topic but I wanted to create a new one in order to keep the problem concise and detailed as possible. My goal is that I want to be able to create a constant force load over a curved surface (specifically, the upper half of a semi-circle) and have every force load be normal to said surface while utilizing 2-D shell elements. Currently, this is how I am doing it. 1. The geometry (and mesh) is the upper half of a semi-circle with a radius of ~4cm (average element mesh size is 0.05cm). *I have been previously doing this model with only horizontal and vertical forces on the arced surface (never combined) E.g. Horizontal forces in the +y direction on the left third of the arc, vertical forces in the -z direction on the top third of the arc, and another set of horizontal forces in the -y direction on the right third of the arc. 2. My boss asked me to combine horizontal and vertical forces in such a way that I will have a (let's just use an easy number) constant 100N force applied to every node on the arc in a direction normal to the surface of said arc (this is hopefully supposed to simulate some sort of compression-like force load). 3. Selecting all of the nodes, I know there are 252 of them on the arc in total. E.g. This makes sense because the length of the arc is equal to s = pi*radius = 12.5664cm and Total # of Nodes = s/.05cm = 252 nodes (approximately) 4. Combining horizontal and vertical forces at each node just requires two simple equations and a little bit of Matlab code *thetaSEP = 180deg / 252 = 0.7143deg (approximately) and hypotenuse = 100N Iteration 1 (Node 1): cos(thetaSEP) = horizontal/hypotenuse = 100N -sin(thetaSEP) = vertical/hypotenuse = 0N Iteration 2 (Node 2): cos(thetaSEP) = horizontal/hypotenuse = 99.9922N -sin(thetaSEP) = vertical/hypotenuse = -1.2466N etc. etc. etc. *Horizontal equation changes to -cos AFTER the 126 iteration 5. After doing this (and hopefully my math is correct...), I have two vectors, H = [1 x 252] and V = [1 x 252] which have been transferred into Excel (I just like Excel a little better than Matlab) which represents the horizontal and vertical forces that I need to combine at each node to create my constant 100N force load along the arc. ***6. Here, I did my first model by hand entering all 252 force vectors, one at a time. ***This is where I'm hoping someone can give me help on how to automate the process from this point into applying these loads across the nodes I have selected in HyperMesh with correct values (which leads to angle as well). If anyone has any help or details (or more resources for that matter) that I can try to make this process faster, that would be much appreciated. User: Q.NGUYEN-DAI has already given me some great advice but to be completely honest, I've never used Tcl in my life nor have I really programmed that much. Even if someone has a more efficient idea of doing this, could you please explain where I'm making this harder than it needs to be (I understand the "one by one" by hand part is the serious problem)? Thanks ahead of time and sorry for the long post. Attached is an image describing the problem a bit more if you need some visual clues as to further explain my situation. Dylan Stelzer
  9. Hi, I had a question concerning the integration of an array from Excel (or for that matter, any type of data where it is a string of numbers) into a boundary condition loading in HyperMesh. I have two arrays of length 126; is there any way to apply them to each of my 126 selected nodes in my HyperMesh model (it is composed of 2-D shell elements)? I've attached a picture of a section of the arc if that helps. I am trying to divide up a normal load over an arc into horizontal and vertical forces efficiently and quickly. If anyone has any suggestions, that would be greatly appreciated. Thanks! Dylan Stelzer
  10. 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
  11. Hello, I currently have finished a model that contains structural and thermal loading. I used OS to conduct an optimization run and came out with a density model at the end. I created a new page in HyperMesh, went to the OSSmooth model, and performed the procedure to run the post-processing tool (FEA Reanalysis, put in the .fem file, put in the .sh file, set the threshold to 0.5, etc. etc.). After doing all of this and running OSSmooth, I end up with the final iteration model that I saw in HyperView, with almost the exact same BC's, materials, and loadsteps...the problem then seems to be that there are a few things that didn't transfer over. There is an error in the conduction interface card (3rd column of CHBDYE) and none of the heat SPC's or heat loads (flux) transferred over to the model but all of the force SPC's and force loads did. Why did the all of the force transfer correctly but none of the thermal? I'm investigating the problem currently but if anyone has any insight or help for this same type of problem, anything is appreciated. Thanks! Dylan Stelzer
  12. I have an external application from which I want to launch the HM and to import a tcl file in it The tcl file has set of commands ( Say importing a nastran model and exporting it to with a new name ). What is the command to do this? is its something hm.exe -tcl abc.tcl where - hm.exe is the full path of the hm - tcl is the command - abc.tcl is the name of the tcl file to be imported
  13. Hello, I am simulating a three point bend test on a composite sample. I would like to simulate/ analyse a range of forces at once and view the analysis as a graph rather than simulating one force to be applied separately. Can someone instruct me if its possible to use a previously meshed model from HyperMesh in HyperStudy to apply parameter sweep of forces? Many thanks
  14. 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
  15. 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
  16. 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
  17. Hi, When I am importing the pressure extracted from the VWT analysis to the model in HyperMesh. I am getting the value of pressure as zero and in contour loads option - I get 'no results available for contour'. I have used AcuOut to export 'pressure' in 'table' format and 'nodal Output' type . I can see pressure values in the .OUT file but when I am importing , no pressure values are being assigned to PLOAD4. (Snapshot attached). I had earlier raised this query in AcuSolve forum but they have suggested to put it in this forum. How can I solve this issue? It would be nice , if somebody can help in sorting this problem. Looking forward to a timely response. Thank you. Garima
  18. Hi, I want to apply the loads extracted from the VWT analysis to the model in HyperMesh. As per the below procedure suggested by Altair colleague , I was able to import loads but the value of pressure was zero and in contour loads option - I get 'no results available for contour'. I was told to do the following: 1. open vwtanalysis.acs file in AcuSolve. 2. Use AcuOut and variable 'pressure' was exported in 'table' format and 'nodal Output' type . 3. Then , using Linear interpolation option - pressure was created. Although pressure is generated , in the HyperMesh, there is no value assigned to the pressure applied to the surface elements on the nodes on the face. (Snapshot attached) How can I solve this issue? It would be nice , if somebody can help in sorting this problem. Looking forward to a timely response. Thank you. Garima
  19. I am facing few issues in my model. I am have created a mesh with an element size of 0.05. 1. When , I check elements for - Connectivity and duplicates, - no issues are found. 2. In 'find edges' check - I get few free edges - I do preview equivalence with 0.010 and then equivalence. Edges get deleted and I get - No error-Surface can enclose a volume. 3. But, when I export to .NAS format for VWT - I get an error - 15934 duplicate elements are found. (Although I have already deleted the duplicate elements in prev. step). 4. I again check for free edges - I get more free edges than the last time. This problem of free edges and duplicate elements keeps on repeating. Please help me in sorting this issue. How can this problem be solved - Is there anything else I need to modify or skip. Looking forward to your response. Thank you. Garima
  20. Hello to all, Does anybody know the developers' forum of HyperMesh or maybe HyperWorks? Best, Lucian. --
  21. Does anyone know why the text in HM panels is (usually) filled with spaces? It seems unnecessary, inconsistently applied, and unlike any other software I use. I know it is not the most critical issue around, but these sorts of annoyances seem to pile up and give unnecessary ammunition for Patran aficionados.
  22. Hi, I want to create point loads on my model. I have variable pressure distribution on my aircraft model and I am interested in replacing the pressure on the lower surface of the model with a point load , having 1.5 times the magnitude of one existing on the upper part, in one side of the model . In short, I am interested in creating unsymmetrical load. How can I create point loads using RBE2/RBE3 element ? I have no clue how to do this because I just know that I need to have RBE2/RBE3 to do this ? Is my understanding correct ? And , is there any way I can create symmetry so that I can create the same point load in other half of the model? Looking forward to a timely response . Thank you.
  23. 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
  24. We, students of MNIT Jaipur are doing a project related to Thermal Stress in a plate enclosed with a mold of another material. We are using HypperMesh as a tool for analysis of the problem. We have gone through the tutorial "RD-1010: Thermal Stress Analysis of a Coffee Pot Lid" but it doesn't include thermal loading (How to apply temperature loading etc.). Can you please guide us for the same.
  25. Hi , I want to select elements, which are at a distance of 50mm from the top and bottom surface of the model. My aim is to transfer solid elements from the design space into the non-design space. Since , I have solver deck so there is no geometry available to create the void. Problem is : how to select elements which are at 50 mm and cover region having dimensions 22 X 20 m. The existing model is in metre. Is there anyway to do the same in HyperMesh? Looking forward to your response. Thank you.
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