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Found 626 results

  1. Hello everyone!I'm performing a finite element analysis with a pair of gears and another component around this pair of gears. This system is named as "planetary gears". My model is simplified, just to see how will be the behavior of the system, I'm using the software Hypermesh with the solver OptiStruct. My question is, which degrees of freedom on "FACE 1" and "FACE 2" should I constraint to rotate "GEAR A" and "GEAR B" around the axis X.Degres of freedom:Displacement: x, y and zRotation: x, y and zI have attached the picture. Thanks so much in advance.Henry
  2. hi Is their any way to calculate torsional stiffness with the help of mass and frequency
  3. Hello, on your opinion, what kind of material formulation could be the best for the material described by the attached graph? Considering we want to apply on the structure a static load case and the material is a Thermoplastic Polymer. I'm using Optistruct solver thank you
  4. Hi, All: May I ask how can I generate .op2 file in my OptiStruct analysis? Thank you very much for your help.
  5. Hey there, since a while my Panel is cut off at the side (see screenshot - on the bottom right). Restarting the Programm / PC didn't help. Deactivating Panels in "View" and reactivating neither. Does someone know this problem and could help me with it? Thank's in advance! Cheers
  6. Hello, I am running a topology optimisation using Optistruct. I am trying to look at the key structural members of an aerospace component. I am attempting to use a low volume fraction of ~3-6%. When the volume fraction is particularly low does this effect the solver's ability to converge? Thank you in advance
  7. Hello, I was once told by a colleague before running an optimisation with optistruct to use the control parameters '-ncpu 8 -core IN'. This was to make the simulation run faster. To my understanding '-ncpu 8' ensures the simulation utilises the computers 8 cores. However, I do not know what the '-core IN' does. Can anyone offer any insight into the meaning behind this and if it actually helps with the simulation speed. Additionally, if there are any other optistruct option inputs that could be used to speed up the simulation then please let me know what they are. Thank you in advance.
  8. Hello, I would like to tetra mesh my component from a 2D mesh of trias that already exists. The 2D mesh must remain constant as it has a load applied to it that cannot be changed. The problem I am having is that the tetra mesh option 'fixed trias to tetra mesh' produces large size elements in the middle of the model. I would like to constrain the maximum size of the 3D tetra mesh so its does not increase in size in this way. Is this possible? Thank you in advance
  9. Hello everyone, Do you have the following solutions for this exercise? I am so eager with the solutions! I have tried doing it by myself but still I couldn't do it. It would be great if anyone could help me by giving step-by-step solution. Thank you. Sincerely, Jalil Ridhwan.
  10. Hello everyone, Do you have the following solutions for this exercise? I am so eager with the solutions! I have tried doing it by myself but still I couldn't do it. It would be great if anyone could help me by giving step-by-step solution. Thank you. Sincerely, Jalil Ridhwan.
  11. Hi everyone, i tried to implement shock absorber in a shock analysis in optistruct. I use tutorial in order to set non linear tranisient analysis. I implement with table1d and pbusht the curve ForceVSdisplacement and applying a force i have checked if the the curves is right. Then i have to checked if my model with this non linear springs has a right answer to established input. In this case the model is loaded with an initial displacement and a gravity. Finally i hate to load model with a curves VelocityVSTime. Now i'm stopped at check problem. My doubt are: the initial dislacement is inserted with IC and TIC in model but in the result there isn't initial dipslacement. Why? The tstep is calculated by solver? Is possible have a fixed timestep? maybe more simple simulate this problem with a explicit solver as Radioss? Thank you for the answeres
  12. Hi, I am trying to learn fatigue using optistruct , Please share me with the videos and fem files regarding fatigue. I already went through the fatigue tutorials in optistruct If I put all of the fatload into one fatevnt, are they now occurring simultaneously? How do I change the model that the loads occurs one after each other? Thankyou N.K
  13. We are trying to analyze composite PIPE. When creating a cylinder surface and simply creating Piles and Laminates, it is stacked with the surface as an intermediate plane as shown in the attached image. (Cylindrical surface is white line) For example, are there methods such as stacking layers from the outermost layer toward the inside? (I do not want to change the diameter of the cylinder)
  14. Hello, I am trying to utilize hyperstudy to optimize a bespoke shell section Beam. Essentially the beam is a hollow I-section but we would like to use hyperstudy to parameterize the thickness. Is this possible? The solver we are using is Optistruct.
  15. Hi, I am trying to convert Radioss file containing monitored volume (perfect gas) to Optistruct. In the convert browser the monitored volume is marked green i.e. "all active attributes for a given entity are mapped". After conversion there is control volume listed as type airbag, but with no parameters other than entity selection. When running analysis in Optistruct (static and explicit dynamic) it seems like monitored volume has no effect on the results. Am I missing something?
  16. Hi. I am analyzing cylindrical pressure vessel with fillet at the inner bottom corner. (Pls see attached picture) During the analysis using Optistruct, it stopped and the error message said that "Element # 2575, element type PENTA" the element was at the tip of the fillet. I know removing the fillet is the one of the best way to gain the quality of elements, but I want to analyze the exact model with fillet. Please tell me how to solve this problem. In above picture, brown is solid element and blue is shell element extracted from the face of the solid element in order to add a inner pressure. I am using HyperWorks ver.13. Thank you.
  17. Please explain me everything about Synthetic Responses. Thanks in advance
  18. Hi Vijay I have been given the following Project and they have put a tight dead line on this. So I really appreciate if you reply me as soon as you can. This is a fan shroud. When this fan shroud is installed on the engine and starts to vibrate, one of the following happens 1. Those purple pieces which are made of steel start to craking 2. The soft shot (green piece) become separated from the hard shot ( yellow piece) The customer is going to give us two more version of revised design of this to see if they work better than their current model Here is the material stress strain curve and its data point for the the yellow piece, the purple pieces are made of stain less steel and we don't have the material data for the green piece (the soft shot) yet. The inner surface of all those steel pieces and a surface all around the soft shot are constrained in all DOF. The customer has provide us the attached Excel file which shows the frequency range and acceleration at each point (please see the attached file) I appreciate if you guide me about type of analysis for this project. What should I consider in the current model to be compared with revised design to say if the revised ones are better or worse? I have sent you the model via your drop box link too. Copy of L5P_Fan_shroud_accelerations.xlsx
  19. Hello, I have a problem with a linear static analysis with Optistruct; I have to evaluate shear tension on a rotating cylinder with angular acceleration. I've completed the tutorial on the rotating disc; I've also add angular acceleration in RACC field of RFORCE and results are in accordance with analytical formulas. My problem consist in the evaluation of stress in a rotating cylinder (without the central hole) with angular acceleration. I have no problem if RACC =0 and non-zero angular velocity; however, when I add angular acceleration, resultant displacements are very high and stress very low. Did I commit any errors in constraints definition? I constrained DOF 1 2 3 of nodes belonging to the axis of the cylinder. Thank you so much for your attention rotating.fem
  20. Hi, I want to simulate the elastic (and further the elasto-plastic) behaviour of arbitrary lattice structures with hyperworks by the use of unit cells. Is there a possibility to apply periodic boundary conditions to simulate unit cells? In addition to that i've tried the Multi-Scale Designer for a simulation like this but there is a major limitation. Within MDS i've to specify matrix and the fiber material but i'm only interested in the behaviour of the fiber material without any influence of the matrix material. I hope someone have a solution regarding this topic ;-) best regards
  21. Hello, I am doing fatigue analysis using SN life approach....I wanted to know what is the effect of frequency of loading cycle on fatigue life and damage? For example if the frequency of load cycle is doubled what will be the life and damage? Thanks in advance.
  22. Guest

    Linear Static Analysis.

    Hi, I have attached a running board linear static analysis. I’m getting a deflection of about 0.0053mm deflection. But in real scenario they are experiencing 1 to 5mm deflection. Instead of applying load on REB3 if I applied load as a point load (single point in the middle of 200 x 80 mm) I’m getting deflection of 3mm. So what should I do here? Should I use REB3 or point load for a cross section of 200 X 80 mm Thanks, Vijay
  23. Hello, I have a laminate with 3 plies. I want to optimise the orientation of these plies such that the deflection of the laminate is minimum under the applied load. I can only perform composite shuffle, but I'm not able to optimise the ply angles. Please advice as to how to proceed to solve this issue Thanks, Kushal.
  24. Hi, I'm modeling two fastened components in Hypermesh and I'm looking for a way to simulate pretensioned bolts. I've seen there are bolts elements in Hypermesh but i can't understand how to apply a preload. Appreciate your help and suggestions. Thank you in advance.
  25. Hi, I'm getting following error from Optistruct. Kindly help. I have already updated my system with Hyperworks 14.0.130/hotfix 14.0.131 and Hwsolvers 14.0.230/hotfix 231.
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