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Found 9 results

  1. Hello, i want to reduce the dynamic stiffness of a rubber bearing by changing the geometry. I have an approximate idea of the "optimized" geometry of this rubber bearing therefore I created morphvolumes and changed the specified area (solid elements) by translating the handles. I saved these changes as shapes which are my design variables. I know that the optimum is between the initial model and the changed model. I want to do an optimization with optistruct to find the optimum. To reduce the dynamic Stiffness i need 3 responses and an equation (dont know another way so far). The calculation of the dynamic Stiffness is simple: Cdyn = Force/Displacement. First i defined an equation with the dequation-panel: F(x,y)=x/y --> where x is the "frf force (ELFORCE)" and y the displacement (frf displacement) which are two of the three responses. The Last response is "function" which includes the dequation and the other two responses defined before. I would like to minimize the response "function" (which is the dynamic stiffness). But it's not possible to create an objective which minimizes my response "function", i get following error: *** ERROR # 1812 *** Multiple responses are assigned to the DESOBJ objective function. A MINMAX/MAXMIN objective function definition with DOBJREF should be used instead. Number of responses = 1000 1) Do you know what the maximum number of responses is? (It's an frequency response analyis from 0 Hz to 3000 Hz with an increment of 3, thats why its 1000 responses (i guess)) . I created an obj reference "dobjref" which includes the response "function", then i created MINMAX objective.This works, and i can start the optimization but here i have some questions: 2) When i define the obj reference i can choose neg and pos reference. What can i do with these references? 3) I don't really know what this minmax function does. Does it minimize the maximum value of the equation? It is not my goal to minimize only the maximum value of the equation, it's rather minimizing the area of the function. 4) Is it normal that optistruct finds a solution after 2 iterations? I have two different shapes and i would expect that it takes a lot of time and iterations to find the optimum. I guess i did something wrong or forgot sth. Sry for asking so many questions and sry for my bad english. I thank you so much in advance. Regards, Fatih Uysal
  2. 任意の個所を固定して(形状を維持して)、モーフィングしたい場合はTool > HyperMorph > morph constraintsパネルが便利です。 下記ビデオでは、円の肉厚を固定したまま、中央の棒のモーフィングを行っています。 morph_constraints.mp4
  3. Hi, everyone. I encountered a problem when morphing an arc. The arc cannot keep the tangency on symmetry plane when altering the radius of the arc (shown in figure). How to keep the vertical tangential direction on point B and D while morphing? Thanks. Morph_ArcTangent.hm
  4. Hi All, I am trying to do morphing 2D elements to a surface. But unable to do so. Can anyone please help? Best Regards, Dhairyasheel Desai
  5. Hello guys, I want to morph a model but after moving my handles there are always some negative jacobians/folded elements. Also after a small movement (about 1-2mm) there are some folded elements (sometimes only 2 folded elements). The size of my model is around 150mm * 250mm and the element size in the moprhing region is around 0.5mm - 5mm. Is there any options to avoid folded elements? Maybe meshing with smaller elements or bigger elements or try some various options in the "morph" subpanel? It would be great if anybody can help me!
  6. Hello, First of all i want to explain what i did so far. I performed a frequency response modal Analysis to investigate the dynamic stiffness of my component in Hypermesh/Optistruct. I performed an Analysis with Optistruct and my results are the frequency-depended Displacement (s) and SPC-Force (F). Then i plotted the dynamic stiffness by calculating Cdyn=F/s. The results are exactly what i expected. After that i changed the structure of my component using Mesh Morphing and recalculated the dynamic stiffness of the changed component. This had a huge effect on the dynamic stiffness. I saved the morph-changes as shapes and created a shape design variable. I want to do a shape optimization to reduce (minimize) the dynamic stiffness. Now my questions: 1. Is it possible to do a shape-optimization to reduce the dynamic stiffness (reduce the quotient F/s) with optistruct? 2. When it is possible, can you give me a hint, how i have to proceed with the Responses, constraints and objectives for the optimization? Regards, Fatih Uysal
  7. I am attempting to move the midside nodes to the quarter points to capture the 1/sqrt® singularity for a crack tip model. I have created nodes at the quarter points but cannot figure out how to move the midside nodes from the half point to the quarter point. I have tried using morph selecting the fixed nodes and moving nodes as well as node edit but have not had any luck. Does anyone know of a way to do this? Thank you, -Clay
  8. Hi All, i have a Shell-model including a bended pipe and attached along the pipe are some brackets and smaller parts, which are connected to the pipe via seam-connectors. Is it possible to scale the tube to a bigger or smaller diameter and simultaneously move the connectors and the nodes of the brackets close to the pipe (so that they move accordingly to the pipe's surface in radial direction)?? I tried morphing-> map to geometry, but can't figure out a way to achieve this. One restriction is, that the geometry of each bracket remains at the same Location, only the nodes/elements close to the seam connectors are allowed to move. Pipe_with_brackets.bmp Any help would be appreciated!!
  9. HyperMeshを用いて、ジオメトリ(CAD)もモーフィング機能で変形させたい場合は、下記の手順で可能です。 1.ジオメトリを読み込んでから、automeshパネルでシェル要素作成 2.HyperMorphパネルで、シェル要素のモーフィングを実行 3.morphパネル⇒morph surfaces機能を実行すると、ジオメトリがメッシュに合うように変形します。 詳細は、以下のビデオをご確認下さい。 HyperMorph_MorphSurfs.mp4 ※音声解説付きです。 ↑が見られない方は、↓のURLへ。 http://fast.wistia.net/embed/iframe/zglo1gpswt?popover=true
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