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  1. 1 like
    Hi. Then I think we should run the model without failure mode first to dectect the moment when the failure is expected!
  2. 1 like
    You could project a slanted rectangle onto the outer cylinder. Select and copy the new face. Sweep the face to create a volume and subtract that volume from the cylinder. Repeat with an orthogonal rectangle. This should naturally leave you with the diamond shaped faces. Next, subtract a cylinder with a smaller radius from the bigger cylinder. Repeat with slanted rectangles on the inside. Finally, select, copy and sweep the diamond-shaped faces even deeper than the slanted rectangles to cut a hole through the outer conductor. Once you have swept a single diamond-shaped face, I would try copy and translating that volume down the length of the cylinder. Ideally, that volume would perfectly overlap the other diamond-shaped faces. This allows you to subtract the volumes from the outer conductor, but more importantly it could all be automated with a Lua script.
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    I would suggest creating a circle on the Construct tab in CADFEKO and then use the Copy + Rotate feature to replicate the circle around the circumference of the cylinder. You could then use the Copy + Translate feature to replicate the circles along the length of the cylinder. If you want to get fancy, you could write a Lua script that Copies, Translates and Rotates each set of circles. The circles can be Projected onto the cylinder and finally deleted. Please note there will be some warping, because the Project feature is not a Bend feature.
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    Hi, You can only export .mp4 file and not .gif file from SimSolid. However, you can make use of this powerpoint option in the attached image to the .mp4 file. It shows, common settings to think about when replaying the animation in PowerPoint are Start on Click and loop until stopped. These can be easily set in the PowerPoint Playback tab as shown. Regards, Koushik Chandrashekhar Project Trainee Altair | Nasdaq: ALTR koushik.chandrashekhar@altair.com | altair.com Connect with us: LinkedIn | Twitter | Facebook
  6. 1 like
    You can add the inductance to a port on the wire that connects to the ground. For a port on the cylinder, you can use the edge port. See e.g here below an edge port for a cylinder dipole. (Or you can make a small gap and use a short wire with a wire port.)
  7. 1 like
    Hi, In the case of stranded coil in Flux 2X, if you don’t put any information about the material, this means that the permeability that you use is 1 (in other hand, thsi means that you use air as material). Best regards.
  8. 1 like
    >> However, how can we mesh the cylinder into triangles with the edge lengths the same as the spacing between the inner and outer conductor Just apply a local mesh size on the inner cylinder face. >> what about the outer conductor connection to the ground? should i use wire approximation or cylindrical? You can use either. You will be adding stray inductance to ground with either of them. But at low frequencies this inductance will be very small.
  9. 1 like
    Feko uses the thin wire approximation. You will not necessarily get accurate results by just specifying the wire radius. It only modifies the self impedance of the wires and will not necessarily accurately model the coupling to the shield, which is critically based on the physical spacing between the inner and outer conductors. It would be better, although computationally more expensive, to model the center conductor as a cylinder meshed into triangles. You must ensure that the meshed triangle edge lengths are roughly the same as the spacing between the inner and outer conductor. Secondly the radiation from the terminations can become significant if the the electrical length of the termination segments become large (so at high frequencies). This electrical length is not modeled in the MTL terminations. At higher frequencies you can compensate for the inductive effect by adding an equivalent capacitance.
  10. 1 like
    Sorry, I overlooked the shared pdf had multiple pages. The signed von mises stress basically displays the tensile (+) and compressive (-) von mises stress. There are two issues: -If I understood the mechanism correctly there should be loads acting on the other end of the pin (as you sketched in the latest post, also see image below). Extract these counterbalancing forces and moments from MBD. -applying loads on the same nodes as constraints is not recommended. In cases like this, inertia relief (Analysis>control cards>PARAM>INREL>-2) should be used to constrain the model. You should not give up so easily- I think you are actually doing great. You can find support on this forum, but you will also have to study on your own. I suggest you go through free Altair e-books, start with Practical Aspects of Finite Element Simulation and for optimization refer to: Practical Aspects of Structural Optimization with Altair OptiStruct You can learn from learning and Certification program. Please follow below link. https://certification.altairuniversity.com/ > (Learn Modeling and Visualisation) Check the following youtube channels: AltairUniversity Altair India Student Contest ELEATION By Apoorv Bapat
  11. 1 like
    You're welcome. Yes, you should fully define the gravity loading. Make sure to select all the nodes in your model (master as well as slave nodes of a rigid body). Here is the procedure:
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    Hi, You can directly add mass to the rigid body. Select rigid body with Rbody Manager or Card Edit in the graphics area and input added mass in MASS field.
  13. 1 like
    Thank you so much for your help. Maybe I just didn't see it in the tutorial. As I'm fairly new in using the software I probably just didn't catch that.
  14. 1 like
    Glad to help. You can show appreciation by liking the content. Yes, the issue is with the G13 , G23 parameters. Are you sure you are not confusing the material property matrix parameters (Gij) with the shear modulus? If material data is specified with the Engineering Constants E1, E2, E3, NU12, NU13, NU23, G12, G23, and G13, then use the MAT9OR data. Analysis>control cards>PARAM>CHECKMAT>NO, but it is possible CHECKMAT is not supported in HM 9.0. It will not solve your problem as mentioned before.
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    I have reviewed your model again because the deformation just did not look right. You forgot to define the material orientation of the honeycomb property (by default if no orientation is provided it takes element orientation). Also, as per the tutorial, the wrong shear yield stress function was assigned. The honeycomb component can now absorb all of the initial kinetic energy. SteelDummy_edit2.hm
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    I load (on dropbox, here I can't because of the size) the h3d with the result of the static analysis so you can see what I've tried to explain above: https://www.dropbox.com/s/4whuo2cvxtgdlr3/carro-rev-rinforzi-mesh-statica-1LoadStep.h3d?dl=0 the pdf contains a possible solution..? I've thought about putting another constraint in component t28.. component_t28.pdf
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    Hi, On your cluster you must have the HW desktop package installed and launch the Radioss simulation using the <install direct>/altair/scripts/radioss to automatically get the h3d file. If Radioss is launched directly using the executable then you must run hvtrans on the A001 files after the Radioss simulation is done. Running hvtrans could be after the job submission can be added to the submit script. This can be done using the command, altair/scripts/hvtrans -a *A001 *A001 -o model.h3d Thanks, Andy
  18. 1 like
    FEM uses an airbox that is called an Absorbing Boundary Condition (ABC). The air is responsible for absorbing all frequencies, all polarizations and all angles of arrival. MoM exploits the tangential component of the electric field converging to 0 as the field approaches a perfect electric conductor (PEC). The rule can also be massaged to account for dielectric materials and finite conductivity metals. The FEM airbox can have difficulty completely absorbing energy across all scenarios and especially grazing angles. Energy then reflects off the airbox and back into the simulation, which corrupts the results. The solution is to then make the airbox bigger at the cost of additional computational resources. MoM does not have this limitation and can handle propagation analytically exact.
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    No problem, you can do the same manually. /THERMAL just makes it easier to adjust the model with a single parameter: The physical time will be reduced by time-factor. All thermal properties will be automatically scaled, no need to change the Radioss Starter inputs. Time values in Radioss Engine input file must be modified.
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    Ctrl+F search for any keyword (input in the upper right corner).
  21. 1 like
    Thank you very much Hyperman! Let me try those and would seek help if I face any further challenges. Really appreciate your help.
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    Hi, "ZERO OR NEGATIVE VOLUME" warning happens when solid elements are very deformed and their characteristic length goes to 0. For large strain formulation, the time step of an element is reduced when the element is compressed. Solid elements assigned with a relatively compliant material can be deformed so severely that its nodes go through the opposite side and even cause a negative volume. In RADIOSS Starter input file (Runname_0000.rad), use Ismstr =2 in the solid property and in RADIOSS Engine file (Runname_0001.rad) use the option/DT/BRICK/CST which will set the time step value tmin at which the solid elements will switch to small strain. /DT/BRICK/CST option is used to control the time step of the analysis. The time step becomes constant after reaching Tmin specified by the user. This honeycomb component can not absorb all of the initial kinetic energy. You should define failure criteria to avoid zero or negative volume and obtain more realistic results. The master-slave definitions were swapped in the type 7 contact- the master should be stiffer, coarser meshed component. Contact parameters were modified to the recommended. There were initial penetrations so the impactor plate was moved. SteelDummy_edit.hm
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    Hi, the time step should not vary significantly during the run and could be a sign of some modeling error. Use timestep control CST mass scaling or AdvancedMassScaling to impose a constant time step. Or use the smallest timestep from the moment when the failure is expected.
  24. 1 like
    Hi Lerik, I think attached video will be helpful. https://altairuniversity.com/learning-library/creating-sub-laminates-and-interface-laminates-using-hypermesh/ Thank you
  25. 1 like
    Hi, To find the value of the data that you need to use, you can use the following formulas : For example for the inertia : J=(1/2)*M*r² where M is the masse and r is the rayon. For the friction : F=(torqur/Speed). For the velocity and speed a t=0 you keep the initial value zero. Best regards.
  26. 1 like
    AcuSovle2019の日本語チュートリアルが Altair connect に公開されました。 <https://connect.altair.com/CP/downloads.html> 内容は38事例で、乱流、熱流体(輻射含む)、移動境界、2相流れ、FSIなど多岐に渡ります。 HyperMesh(claasic)を用いたAcuSolveの実行方法も多数あり、HyperMeshユーザーにもとても役立つ内容です。 AS日本語チュートリアルダウンロード手順.pdf ※ファイルのダウンロードには、当フォーラムでのサインインが必要です。
  27. 1 like
    Altair Fluxでは、回転体設定をしたり、移動設定をした際に、それらの回転量、移動量などをパラメータとして自動的に保持します。 さらにそれらのパラメータを計算設定に利用することが可能です。 モータの始動時の解析などでは、ロータの回転量に従った電源位相を設定する必要があります。 そのような場合に有効に利用できます。 移動体のMechanical Setの名称を"Rotor"であったとすると、 AngPos(ROTOR) や、 ANGPOS_ROTOR などが利用可能です。
  28. 1 like
    Altair Fluxではパラメータを作成して計算設定に利用することができます。 パラメータには下図の様にいくつかの種類があります。 適切に利用することで、パラメータスタディなどを簡単におこなえます。 1):Geometric parameter 形状関係、座標関係に使用できるパラメータです。 依存関係がなければScenarioから変更するパラメータとして定義することが可能です。 Geometric parameterの定義には他のGeometric parmeterを利用することが可能です。 2):Parameter I/O Parameter controlled via a scenario Scenarioから変更するパラメータとして定義することが可能です。 Parameter define by a formula Scenarioから直接は変更しないパラメータです。 ほかのパラメータと依存関係を持つことが可能で、関係あるパラメータの値が変わると対応した値に更新されます。 Parameter defined by a table of values 他のパラメータとテーブルで依存関係を持つことが可能です。 過渡解析などで時間変化するパラメータなどを利用したいときなどに利用します。 Parameter for multiphysical application マルチフィジクス用のパラメータで、外部のソフトウェアとのやり取りをするときなどに利用します。 3):Spatial quantity 分布量をパラメータとして登録できます。 着磁分布を引き継ぐときなど、分布を設定するときに利用するパラメータです。
  29. 1 like
    Fluxのマニュアルへのアクセス方法は下記のフォーラムに記載したリファレンスへのアクセス方法と同様に操作いただくと、各種マニュアルのpdfファイルをご確認いただけます。
  30. 1 like
    Altair Fluxのベーシックチュートリアルをもとにした日本語資料を作成いたしました。 ”00_Flux_Training.pdf”というファイル名です。お持ちでない方、ご興味がある方は 弊社サポートまたは、担当営業までお問い合わせください。 ご活用いただけると幸いです。
  31. 1 like
    ベーシックチュートリアルをアップデートしました。 "01_Flux_Training.pdf"というファイル名で配布しております。 お持ちでない方、ご興味がある方は 弊社サポートまたは、担当営業までお問い合わせください。 ご活用いただけると幸いです。 アップデート内容は下記のとおりです。 ・スライドのアスペクト比を標準(4:3)からワイド(16:9)に変更 ・エンティティの選択方法について、例題を交えて説明 ・メッシュの設定方法についての説明を追加 ・Fluxでのデータ構成についての説明を追加 ・生成されるファイルについての説明を追加 ・3D Basic exampleの例題を変更 00_Flux_Training.pdfでは電磁接触器 ↓ 01_Flux_Training.pdfではアクチュエータ Flux内で形状作成する場合と、CADデータとしてインポートする場合の両方を準備しております。 CADインポートで実施する場合はチュートリアルに対応している "all_part.SAT"というファイルもご提供いたします。 ・2Dの例題として、"Brushless IPM motor tutorial"を追加 モータテンプレートによる形状作成で、 コギングトルク、逆起電力、定格速度時、始動時、モータインダクタンス を求めるチュートリアルになっています。
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    Hi, To compute the torque in Flux using a sensor you need to create a sensor. To do it: In parameter/quantity j, create a new sensor Type of sensor: predefined, magnetic torque Rotation axis: Direction: parallel to oz Pivot point (0,0) Computation domain: select a face region. Other way to compute the torque is to draw a 2D curve of torque. To do it: Curve 2D curve (I/O parameter) >> new >> mechanical set >> select electromagnetic torque To use this data in Simulink, you can export this curve as txt file. In you Simulink model you can use a look up table to read this txt file. Hope this will help. Best regards.
  33. 1 like
    pyFluxやpythonに関するリファレンスは、下図のようにPDFで確認することができます。
  34. 1 like
    電磁ポテンシャルを有限要素法を用いて計算します。 2D解析では磁気ベクトルポテンシャルモデルで、3D解析では磁気スカラーポテンシャルモデルをデフォルトに、一部の解析タイプでは磁気ベクトルポテンシャルモデルもご利用いただけます。
  35. 1 like
    You can do this easily with freeware, see the attached video that uses a free ware called pdf creator. (rename the video attached as jpg below to wmv) The video is only for demonstration, please check with pdf creator about its licensing and use. we cannot be responsible for external software and its effects. http://www.pdfforge.org/pdfcreator If you make the pdfcreator for example the default printer, then you can use the keyboard shortcut of ctrl + f3 or ctrl + f1 to print from HyperView. Note while saving you can choose the file format type to .eps, not doing so will save in the default pdf format. v3j0q-eps.txt
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