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  1. Dear Tinh, Thanks for your response. I had set the averaging method to maximum but somehow my results were unexpected. So maybe there was something wrong in my set-up of the model. Today I did the convergence check again with a mesh reduction factor of 1.5, which is a common rule for a mesh convergence check. Now the solution is converging nicely as you can see in the figures below. Thanks for the feedback. I really appreciate this forum. Regards, mike
  2. Dear hyperworks users, I have a question regarding the 1D beam elements. Currently I am using 1D beam elements to model a truss type structure. I have performed a convergence check in which I have reduce my mesh size stepwise and checked the maximum von mises stress in my model. I have plotted the node count (The amount of nodes in the model) to the maximum stress in my elements. The boundary conditions and load remains the same during the different runs. Only the mesh size was reduced. The table with the mesh size reduction steps and the graph of the node count versus the maximum stress are shown below. The strange thing is that the solution does not converge. At the end, the values are increasing when the mesh size is reduced. This should not be the case. Does anyone have a suggestion for me. How can I validate my mesh size in hyperworks? Kind regards, Mike
  3. Dear Premanand Thanks, That was all I need to know. Regards, Mike
  4. Dear hyperworks users, Currently I am working on a size optimization of a truss structure. I would like to investigate if it is possible to apply a wind pressure onto this structure. I have defined a line model which is modeled with Cbeam elements in Hypermesh. Now I would like to apply a pressure force at one side of the structure, which would be the wind pressure. On the internet I have found the description in the picture below, does this mean that I would have to convert my wind pressure into a force which then must be applied as a distributed force on the elements. This would then be an approximation due to the fact that the lateral surface area of the truss structure depends on the outcome of the size optimization. Can someone confirm me if this is the right procedure to solve this problem? Thanks in advance! Regards, Mike
  5. Thanks for the input, I will give it a try and let you know. Regards, Mike
  6. Hi everyone, I have a question regarding the boundary conditions. Is it possible to define translational boundary conditions which only act in one direction? So for example only in the positive X-direction and not in the negative X-direction. So that these regions can only transfer compression and separates if put under tension. This means that the reaction force can only work in the direction of the object and not in the opposite direction. Is this somehow possible? Regards, Mike
  7. Thanks Niwi, I am not able to import the session manually, because the button is grayed out. Maybe this is due to the fact I am using the student version of Optistruct. But I can import the results manually by selecting the separate load cases. So therefore I can visualize the results manually. I will try to use the Output, property card in order to check if this option is useful for the post-processing of the results. Thanks for the feedback. Regards, Mike
  8. Hi Niwi, Thanks for your reply. When I perform the optimization according to all the steps, then I am not able to visualize or select the different loadcases in Hyperview. When I just perform a simply analysis without any optimization, then I am able to select the different load cases. But when I perform a size optimization I only see one load case. My question is: are all the load cases incorporated in the optimization process just as with topology optimization. Or am I doing something wrong? After the size optimization, I would like to do further analysis in Ansys. I can see the mass and the member sizes in the output file and therefore I can manually load this line model in Ansys and assign a cross section to the different line elements. But I was wondering if there is another method to do this. I will attach my tutorial files so that you can have a look. Tutorial_tube_frame.fem Tutorial_Tube_frame.h3d Regards, mike
  9. Hi everyone, I have a small question about Hyperview. I am running a size optimization of a tube frame. This exercise can be found in the following link: https://altairuniversity.com/learning-library/size-optimization-tutorial-of-a-tube-frame/ I have incorporated multiple load cases which are also included in my constraints. So the constraints are applied to every loadstep. When I run the analysis and open hyperview, I can only select one subcase. Does this mean that only this load case is included in the optimization or are the other load cases also included in this results? Because I would like to investigate the stresses in the design for the different load cases. Another question that I have is that I would like to export this result. What are the options for exporting this results? I hope that someone can clarify this for me. Regards, Mike
  10. Yeah, Now it works! Thanks for all the feedback
  11. Hi everyone, Currently I am using optistruct for the size optimization of a truss structure. Currently I am following the tutorial: Conceptual design of a bicycle frame. This tutorial can be found in the following link: https://www.google.nl/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwic57Og5bnbAhXKY1AKHa5RB5kQFggpMAA&url=https%3A%2F%2Faltairuniversity.com%2Fwp-content%2Fuploads%2F2017%2F10%2FTutorial_Conceptual_Bike_Design_updated.pdf&usg=AOvVaw2l_GCi_dWKjbOzwZ_ETXc2 I am able to follow al the steps but unfortunately I obtain the following error when I want to perform the analysis on the bicycle frame. *** ERROR # 1203 *** in the input data: Vector defined in fields 6-8 has zero length. I understand that the problem arise from the fact the orientation of the beam is not properly defined. The problem is that I don't know how to fix it. I have tried to define the orientation of the beams, which looks alright when I turn on the 1D detailed element representation. But still the error remains. When I import the provided tutorial model files, then I am able to run the analysis but the results button does not appear. What could be the cause of these problems and where can I find the required information to solve these problems. Your feedback will be highly appreciated. Regards, Mike
  12. Dear Ilin Engineering I would suggest to convert your sheet surface to a sheet body with the push/pull commando. Instead of specifying a plate with a thickness of 0.01m, you increase the thickness of the plate with 0.01m in order to obtain a body. When I do this, I am able to analyze the model. In the attachment you can find the adapted model. I hope this will help you. Regards, Michael model1.stmod
  13. Dear Luigi, Go to file->preferences->Run option-> and select the amount of CPU cores for the optimization. I hope this will decrease your run time. Regards, Michael
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