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Error 2150
Hey, I am just learning optistruct, 1 week in. I'm doing a topology optimization for a steel bridge competition, where the aggregate deflection needs to be less than 0.75 inches, the weight of the structure is less than 250lbs, and the sway is less than 0.25 inches. I am having trouble with error 2150. The model on…
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Accessing Statistically-Based Design-Allowable Properties Using MMPDS Data in AMDC
In finite element analysis (FEA), the accuracy of your simulation is only as good as the input data - particularly the material properties. In safety-critical applications such as aerospace, defense, and automotive, using nominal or average material properties is not enough. These values don’t account for natural…
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How to bind Optistruct 2025.1 to Intel Performance cores only
How to bind Optistruct 2025.1 to Intel 13th gen. Performance cores on Windows 11 Business 24H2. Even with high optistruct process priority, optistruct switches from performance to efficiency cores. For solver performance reason it would be nice to avoid running optistruct on efficiency cores. Is there any solution or…
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Modal Analysis of a pipe with coolant in it .(Fluid and Structure interaction in Optistruct)
I have modelled pipe with Shell elements and coolant with tetra element . I have to perform modal analysis . I have used MAT10 property for fluid . How to model the fluid pipe interaction . As the pipe system has horizontal and vertical pipes .
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Hyperworks 2022.1 run options analyze to optimization
Hi, I'm doing the tutorial: Track 2: Design Composite Structures with Simulation 3 Composite Optimization While doing the free-size optimization, changing the run options from analyze to optimization seems possible. I tried with 2022.1, and it's clearly not possible in this menu. I was looking at the Solver Options but I…
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Solver fails on manually edited .fem file - Student License
Hello Altair Community, I am working on automating the generation of a dataset for a FEM model and need help with an issue when manually modifying the .fem file. My Setup: Model: A beam modeled with 2D shell elements in HyperMesh. Analysis: Successfully run Normal Modes and Modal Transient analysis. Goal: To run multiple…
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接触の微小な初期干渉を除去する ADJUST オプションの使用例
はじめに 理想を言えば、初期干渉のないモデルを作ることが理想ですが、どんなにキレイに CAD やメッシュを作成しても、それ等自身も、ある程度の交差を持って作成されたデータですし、実際に計算を実行する OptiStruct にしてもコンピュータ自身にしても、数値の丸め誤差があるので、初期干渉と、判定されてしまうことはあります。 目に見えて判断できるようなものは、メッシュで取り除いた方がよいとしても、あまり細かいところまで気にしていると、いつまでもモデルが完成しないので、ここは、OptiStruct 自身が持つ初期干渉調整機能を使うのがよいかと思います。 例題1、初期干渉をしてしまうモデル ダウンロード:…
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What's the difference between OptiStruct's THETA and Radioss' PHI when assigning material direction?
So, I know exactly how the material direction is assigned in OptiStruct, starting from G1-G2 and rotating in respect to the normal of a shell element. But what about Radioss? Is phi exactly the same? Daniele
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Multiple loadcases in optistruct
Dear support, How to apply multiple loads with different amplitude in same loadstep. could some one help us on this.
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Assistance Required: Unable to Connect OptiStruct Solver with HyperMesh (Student License)
Dear Altair Support Team, I am currently using HyperMesh 2025 (Student Edition) under my college license. While HyperMesh is working, I am facing issues in connecting it with the OptiStruct solver. As per the installation process, HyperMesh installs successfully with the hw_desktop setup. However, the OptiStruct solver is…
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なぜかすごい初期干渉が起きてしまう例題と回避方法
初めに OptiStruct の接触 (CONTACT カード) を使っていると、なぜか、ふいに、ものすごい初期干渉として判定されてしまう時があります。 今回は、ものすごい初期干渉をしてしまうモデルを一つ提示し、なぜそうなってしまったのか、どういう回避方法があるのか、といったところを示します。 例題モデル ダウンロード: このように２枚のシェル要素が重なっているモデルです。厚みがありすぎて初期干渉しているわけではありません。両方の板厚は 1mm で、隙間も 1mm あります。 HyperMesh で立体表示させるとちょうどつらつらです。 このモデルを実行すると、時刻 0 でとんでもない桁の接触力を見ることになります。単位系は ton,…
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OS-E: 0305 Preloaded Modal Frequency Response Analysis
Dear Community, I recently came across a tutorial on Preloaded Modal Frequency Response Analysis. While checking the CNTF output, I noticed that the contact forces in the modal frequency response are reset to zero, instead of reflecting the contact forces from the two previous load steps (pretension and pressure). Is this…
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ROPS Analysis with OptiStruct Explicit
The goal of this article is to demonstrate how to use Altair OptiStruct explicit capabilities to perform a rollover protective structure (ROPS) analysis. In the attached presentation, users can find the model details and results. This article includes: A ready-to-use Altair OptiStruct model Altair HyperMesh v2025.1 Altair…
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CNTF output modal frequency response
Dear Community, According to the help documentation for version 2025.1, the CNTF output request is now available for frequency response analysis (I assume this applies to both direct and modal approaches). I am trying to use this feature to evaluate the contact forces between two parts in a modal frequency response…
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Consultation on Unidirectional Coupling between EDEM and Optistruct
I now see in the forum that in EDEM unidirectional coupling, EDEM obtains the force on the material and then uses finite element to perform static structural analysis. So, I want to obtain the stress changes of the material on the equipment over time, that is, to perform transient calculations. Is the method of exporting…
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Identify Bolt Loosening due to vibration ?
Hello Team, I want to understand about simulation of Bolt loosening judgement using Hypermesh. How we can check either bolt will be loosen or not ? Thanks & Regards, Aman Yadav JBM R&D 7898916272
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音響メッシュだけでの固有値解析
はじめに OptiStruct のヘルプには様々な例題があるのですが、シンプルに、音響メッシュだけで、音場の、固有周波数 (共鳴の周波数) を計算するものがありません。なにかと、構造―音場連成の周波数応答解析のようになっていたりします。 そういったモデルも、構造の振動解析モデルと、音場の振動解析モデルの組み合わせですので、音場だけの固有値解析モデルの作り方を知っている方が、何かと、そういったモデルを理解する助けにもなると思います。 そこで、本記事では、非常に検証が簡単な、両端を開放した管が作る音場の固有周波数を求めるモデルを提示します。 モデル ダウンロード: 長さ 220mm, 直径 10mm…
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Non-linear static loadsteps converging before reaching load factor 1.0
Hello all, I'm trying to analyse an aircraft wing model with Optistruct non-linear statics with "PARAM,LGDISP,1" and "PARAM,FLLWER,1", in order to simulate large displacement efects on the structure, namely wing crushing. No contact or non-linear material curves. I'm using the following non-linear parameters: NLPARM 100 10…
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Need to Know how AEFACT & MKAERO1 cards refer for Flutter analysis load steps?
Dear Team, I wants know how to create AEFACT & MKAERO1 card and how it referrence to the model to the load step (because loads like AEFACT & MKAERO1 card did n't mentioned in load steps) ? And need more explaination about AEFACT & MKAERO1 cards how it works? i try to review it , but it did n't work! OS-T: 8030 Flutter…
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Fatigue analysis using Displacement history data
i need a help to solve fatigue problem using displacement history data, i know how to define load history but not getting how to deal with displacement history data
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Modelling two brazed plates
Hello everyone , I am meshing a cooling plate . the cooling plate basically have two plates : a) channel plate b) base plate . Both the plates are brazed together I have meshed base and channel plate separately . How should i join both the plates to get real world scenario. I have attached an image with top plate as…
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After optimization, when comparing the results, the mass appears to have increased compared to the o
I’m a beginner with this software, so I’d like to ask not only about the issue but also how to use it. When clicking the "Comparison of Results" tab after performing structural optimization, the optimized result is displayed, but the displayed mass value is clearly incorrect. The optimization conditions were: Maximization…
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Problem with CORD4R?
Hi everybody, I think I have a problem with CORD4R… it seems to be ok on Hypermesh screen, but the results are not.. I have defined a local Csys to apply a local YZ load (small angle of nearly 6.5°) on my model, but when I check the applied loads in optistruct output, I get a global X load. I have a look at the…
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Structural Analysis of EDEM Polyhedral Particles using HyperMesh and OptiStruct
This article provides a step-by-step guide for performing a structural analysis on polyhedral particles using force data exported from an EDEM simulation. The workflow involves mapping EDEM forces onto a finite element mesh in HyperMesh and running a static analysis in OptiStruct. Note: This workflow is specifically…
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OptiStruct Cohesive Zone MCOHED import
Hello, I am supporting a customer to model one of our products in Optistruct. I don't have a valid license and created the model only based on the OptiStruct manual. The customer reported a problems to do that. Would it be possible for somebody to import the attached models (two diferent versions) in the software to check…
