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Found 3 results

  1. 固有値解析のFEMモデルをFemap with NASTRANで作成しました。 ファイル拡張子はdatです。 NASTRANで解析したところ、非常に長い時間がかかりました。 時間短縮のため、HyperMeshにインポートしてOptistructで固有値解析を実行したいと思います。 しかし、図のように操作すると、次のエラーが発生しました。 *** ERROR # 827 *** Invalid ASET run, PARAM,EXTOUT,DMIGPCH or PARAM,EXTOUT,DMIGBIN must be specified for DMIG output. エラーを解決するにはどうすればよいでしょうか? 参考資料があるとより助かります。 また、同じモデルでOptistructを使用して周波数応答解析も実行したいと思っています。 以下は、datデータの抜粋です。 INIT MASTER(S)NASTRAN SYSTEM(319)=1ID Neo66B,FemapSOL SEMODESTIME 10000CEND TITLE = MSC/MD Nastran モード 解析セット ECHO = NONE MFLUID = 1 DISPLACEMENT(PLOT) = ALL METHOD = 1BEGIN BULK$ ***************************************************************************$ Written by : Femap with NX Nastran$ Version : 11.1.1$ Translator : MSC/MD Nastran$ From Model : D:\Neo66BC_Hull-vibration_Standard.modfem$ Date : Mon Jul 14 08:00:18 2014$ ***************************************************************************$PARAM,POST,-1PARAM,OGEOM,NOPARAM,AUTOSPC,YESPARAM,GRDPNT,0EIGRL 1 .5 30. 0 MASSCORD2C 1 0 0. 0. 0. 0. 0. 1.+FEMAPC1+FEMAPC1 1. 0. 1. CORD2S 2 0 0. 0. 0. 0. 0. 1.+FEMAPC2+FEMAPC2 1. 0. 1. $ Femap with NX Nastran Constraint Set 1 : ASETASET 3 123...ASET 50126 123$ Femap with NX Nastran Property 20108000 : Mat01_t8.0PSHELL 20108000 1 8. 1 1 0.... ELIST 1 200001 200002 200003 200004 200005 200006 200007+ ...+ 208872 208873 208874 208875 208876 208877 $ Femap with NX Nastran Region 1 : 無題MFLUID 1 0 5375. 1.025-9 1 N NENDDATA
  2. FEM model for eigenvalue analysis was created with Femap with NASTRAN. The file extension is dat. However, the analysis at NASTRAN took a very long time. So, I want to import this into HyperMesh, and perform eigenvalue analysis with Optistruct. When I operated as shown, I got the following error: *** ERROR # 827 *** Invalid ASET run, PARAM,EXTOUT,DMIGPCH or PARAM,EXTOUT,DMIGBIN must be specified for DMIG output. How do I resolve the error? Reference documents are more helpful. Also, I want to perform frequency response analysis with Optistruct on the same model too. The following is an excerpt of dat data. INIT MASTER(S) NASTRAN SYSTEM(319)=1 ID Neo66B,Femap SOL SEMODES TIME 10000 CEND TITLE = MSC/MD Nastran モード 解析セット ECHO = NONE MFLUID = 1 DISPLACEMENT(PLOT) = ALL METHOD = 1 BEGIN BULK $ *************************************************************************** $ Written by : Femap with NX Nastran $ Version : 11.1.1 $ Translator : MSC/MD Nastran $ From Model : D:\Neo66BC_Hull-vibration_Standard.modfem $ Date : Mon Jul 14 08:00:18 2014 $ *************************************************************************** $ PARAM,POST,-1 PARAM,OGEOM,NO PARAM,AUTOSPC,YES PARAM,GRDPNT,0 EIGRL 1 .5 30. 0 MASS CORD2C 1 0 0. 0. 0. 0. 0. 1.+FEMAPC1 +FEMAPC1 1. 0. 1. CORD2S 2 0 0. 0. 0. 0. 0. 1.+FEMAPC2 +FEMAPC2 1. 0. 1. $ Femap with NX Nastran Constraint Set 1 : ASET ASET 3 123 ... ASET 50126 123 $ Femap with NX Nastran Property 20108000 : Mat01_t8.0 PSHELL 20108000 1 8. 1 1 0. ... ELIST 1 200001 200002 200003 200004 200005 200006 200007+ ... + 208872 208873 208874 208875 208876 208877 $ Femap with NX Nastran Region 1 : 無題 MFLUID 1 0 5375. 1.025-9 1 N N ENDDATA
  3. Hello all. I know there is a very good tutorial on the subject (https://www.youtube.com/watch?v=236ofmwz1X4) however I would like to share my latest experience when comparing stress results obtained from two different solvers i.e. MSC NASTRAN and Optistruct. By default NASTRAN calculates stress using the command: STRESS(PLOT,SORT1,REAL,VONMISES,BILIN)=ALL, meaning that (if you neglect the other terms) a bilinear extrapolation is used to get the stresses from the element's centroid to the nodes. Since optistruct/RADIOSS calculates stress at the element's centroid by default, I supposed that the equivalent command in the .fem input file for optistruct would be: STRESS(SORT1,H3D,REAL,ALL,BILIN) = YES (I have replaced "VONMISES" with "ALL" to have all stresses in my output) and performed two examples of simple static analyses: one with shell elements: the well known hole in plate and another with a bracket meshed with solid elements (4 noded tetras). In both cases the results from MSC NASTRAN and Optistruct were identical, as long as in Hyperview I activated the option "use corner data" (participation of element to the node). Without "corner data" activation the difference in VM stress between NASTRAN and Optistruct for the hole in plate problem was 175 MPa (NASTRAN) to 157 MPa (Optistruct). Now: I performed an analysis of a 3d bolted connection (two plates connected with a 3d bolt) with bolt pretension as a first step and a tensile force acting on the top plate of the connection as the second step. Obviously, this problem involved contact between the plates and the bolt. The analysis converged and the results were correct since I knew from published results (and NASTRAN) that max. stress should be approx. 80 MPa. I received the same results with optistruct, but without the "use corner data" activated, although I have used the command described before for stress. If I activate the corner data in Hyperview, then my stresses almost double in magnitude (156 MPa). So, this contradicts with what I have found with my previous tests (hole in plate and 3d bracket). Does it have to do with the "contact"? Thank you in advance for your reply.
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