Re: Lattice Structures Export

Your welcome Sebastien,

The tcl script I was referring to does not seem to be in the file exchange unfortunately. However extracting the tapered beams should be relatively straighforward.

Basically, for each tapered beam or element with card image PBEAML, get the dimensions of both radii. From there you create a solid cone using the coordinates of nodes associated with the beams. Continue until all the beams have been selected. Then when all the cones are created, mesh the exterior with trias and then export to stl. The final step is to merge the cones in another software.

If you haven't used tcl before then you should look into the help files to learn more about the hypermesh api. Your commands are also printed out in a 'command.tcl' file during hypermesh sessions.

etrud011

1

Unable to create file due to "Run-time error '381': Invalid property array index"

I am unable to get S-FRAME to allow me to create a new file. Every time I select "New 2D" or "New 3D", I get the error message: "Run-time error '381': Invalid property array index".

I have attempted to troubleshoot the problem in the following ways:

- I have uninstalled and re-installed the program multiple times

- I have tried installing from both the MSI and EXE version of the installer

- I have tried installing an older version of the software

- I have verified my Windows version is up to date, and I have used the SFC and DISM commands in CMD to verify my file system and windows installation is not corrupt

- I have used the repair option in control panel for the program installation

No matter what I do, I can't seem to get the software to start working. Unfortunately, I also haven't been able to find any articles or discussion threads from other users experiencing similar issues with S-FRAME or any other Altair software.

If you have experienced this problem and know how to resolve it, or if you think I've missed some obvious troubleshooting steps, please let me know. I have attached a photo of the error message.

nmark032

1

Re: Issue with Shell Elements Intersecting 3D Elements in HyperWorks Simulations

Hi Paulo,
In your opinion the connection setup in this tutorial: https://2023.help.altair.com/2023/hwsolvers/os/topics/solvers/os/rubber_ring_hwx_tutorial_r.htm#reference_mtw_vt2_nwb, Isn't correct? Because I used this tutorial and found the same intersection?

Ali,

I wouldn't say "not correct". Although, there's one setting in the PCONT property that might help with contact penetration. GPAD → THICK

And then, you can check Contact Deformation SPOS / Normal (Penetration) output to check actual values for penetration.

Visually, there's no penetration. But I can see from the contour that there's some. Is it acceptable? Should you refine your mesh in the contact region? It all depends on your model.

But if you have set this up exactly like the tutorial and you're seeing that much of visual penetration, then there might be something odd going on. Can you open the model I attach and check this?

Kind Regards,
Paulo Libório.

Paulo Libório

1

Re: Eror EDEMCal_No EDEM executable found

Hi Isabel

In the EDEM executable field, you will want to specify the full path of the EDEM executable. Generally, it is in your EDEM installation. For example, for me, it is "C:/Program Files/Altair/2022.3/EDEM/bin/edem.exe".

Hope this helps.

Thanks,
Jerrin Job

jerrinjobs

2

Re: Lattice Structures Export

I believe that there is a tcl script in the file exchange that can create cylinders from the tapered 1d elements. From there you can export the cylinders as stl objects and then use another software to merge them all together (meshmixer). Another method that might work is by using Altair Inspire to automatically generate the stl file with the lattice beams.

etrud011

1

液体の影響を考慮した振動解析には MFLUID 仮想流体質量の使用が簡単です。

概要

OptiStruct には MFLUID という便利な仮想流体質量機能があります。仮想流体質量が何かというと、私も数式モデルをきちんと正確に理解しているわけではないので、ざっくり説明すると、

仮想的なポテンシャル流れ場を計算
圧力と加速度の行列から、仮想質量行列を生成 (F=Ma から M=F/a を求めるイメージ)
仮想質量を追加した状態で固有値計算

となります。

流れ場を計算するなんてなると、流体部分のモデリングまで大変だなあと、思うかもしれませんが、実際の作業は、液体に接するサーフェスに MFLUID カードをくっつけるだけですので、モデルとしては見た目、普通の構造モデルと何ら変わらないです。下図は丸い筒のモデルですが、普通のシェルモデルであり、流体メッシュは必要ありません。

モデル

検証情報

実際に、上図のモデルを使った検証モデル、検証データがオンラインヘルプにてユーザー様向けに公開されています。リンクをたどってもらうと、実験とかなり良く一致していることが分かります。検証モデルですが、MFLUID 設定の例としても利用できます。

https://2021.help.altair.com/2021.2/hwsolvers/os/topics/solvers/os/dynamic_behavior_fluid_containing_structure_using_fluid_example_os_r.htm

固有値アニメ

制限

何にでも合うと言うわけではなく、制限もあります。こちらに詳しく記載があります。

https://2021.help.altair.com/2021.2/hwsolvers/os/topics/solvers/os/dynamic_behavior_fluid_containing_structure_using_fluid_example_os_r.htm

粘性、渦のないポテンシャル流れですので、イメージ的には深い水を静かに揺らすようなイメージになるかと思います。スロッシングでバシャバシャするとか、液面が浅くてバシャバシャする、水を叩くような挙動に適用してしまうと、かなり実験とは結果が変わってくるかと思われます。

それから、液面はフリーである必要があります。閉じた空間に完全に水で満たしたような物体に使ってしまった場合も、かなり実験との差が出てくると思われます。

実験と見比べて、適用するしないを決めてみてください。

altair_fukuoka

1

Community Magnetics Fireside Chat Session 2: AMRFEKO Feature in Feko - Coming Soon!!

Get ready for our second Community Magnetics Fireside Chat for High-Frequency Electromagnetics that is coming up on February 22nd, 2024 at 10 AM Eastern Time.

In this session, you will learn how to use the new AMRFEKO tool that enables automatic adaptive mesh refinement based on error estimates for FEM and MoM/FEM solutions. The fully automatic tool can be launched from a command prompt or any of the Feko GUIs and can also be used on HPC resources in a similar fashion to RUNFEKO.