Interface with FE programs

Transcription

1 Page 1 of 47 Interdisciplinary > RFlex > Flexible body Interface Interface with FE programs RecurDyn/RFlex can import FE model from ANSYS, NX/NASTRAN, MSC/NASTRAN and I-DEAS. Figure 1 RecurDyn/RFlex Interface selection ANSYS Interface ANSYS Version RecurDyn/RFlex supports from version 7.0 to Interface Dialog In RecurDyn/RFlex Interface selection shown in Figure 2, select ANSYS Figure 2 ANSYS Interface ANSYS Interface needs the following four files and these file and output files name automatically set same as emat file name. Result file(filename.rst): Contains model information such as node, element, property and the result of CMS or Modal analysis. Material file(filename.mp): Contains material information such as Young s modulus, shear modulus and Poisson s ratio. Element matrices file(filename.emat): Contains element matrices information such as element stiffness and mass matrices CM file (filename.cm): Contains interface node information. Input File Generation

2 Page 2 of 47 ANSYS - Example: CMS analysis This section explains how to build FE model and analyze it with CMS method. The example model is 2D rectangular model. The model can be meshed as shell 63 element with Element edge length option. Shell 63 element has Real Constant with thickness, Steel material is used in this model. Figure 3 Target model 1. Select Configure ANSYS products on the popup menu and specify working directory and jobname. Figure 4 ANSYS launcher 2. Select Structural on the Preferences for GUI filtering Preferences for GUI filtering Preferences..> Structural

3 Page 3 of 47 Figure 5 Preference for GUI filtering 3. Select Element Type, Real Constants Element type Preprocessor > Element type > Add/Edit/Delete > Add > Shell 63 > OK > Close Enter Real Constants Preprocessor > Real Constants > Add > OK Set shell thicknesses I, J, K, L as 0.05 Figure 6 Real constant for shell element 4. Enter Material property

4 Page 4 of 47 Material property Preprocessor > Material Props > Constant > Isotropic > Specify material number as 1 > OK Fill in the Young s modulus(70e9n/m2), Possion ratio(0.33), density(2710kg/m3) > OK Figure 7 Material Property 5. Create rectangular geometric entity Create Rectangle by Dimensions Preprocessor > Modeling Create > Area Rectangle > By Dimensions > Fill the x1, x2, y1, & y2 as 0.0, 0.0, 1.0, & 1.0 > OK Figure 8 Rectangle by Dimensions 6. Create area meshing using MeshTools Use line set to define element edge length. Preprocessor > Mesh Tool > Size Controls > Lines > Pick All > OK > SIZE element edge length(0.1) > OK

5 Page 5 of 47 Figure 9 Line set with Element edge length Mesh model MeshTool > Mesh > Select model > OK

6 Page 6 of 47 Figure 10 Meshed Rectangular geometric entity 7. Define Interface nodes Select>Set Component manager Create New component Create from 'Nodes' Check 'Pick entities' Name new component 'INTERFACE' Select interface nodes on FE model

7 Page 7 of 47 Figure 11 Create new component

8 Page 8 of 47 Figure 12 Select Interface nodes 8. Define Parameter Parameters>Scalar Parameters Input the number of modes like 'NMODES=10' Accept it Figure 13 Set the number of modes 9. Read RD's input file for CMS analysis

9 Page 9 of 47 File>Read Input from Read 'RecurDyn.MAC' This macro input file is included in the following folder. '<Install dir>\toolkit\flexible input files\ansys' Figure 14 Created files 10. Check the result files. The four files must exist in work folder. - gencms.rst - gencms.mp - gencms.emat - gencms.cm Figure 15 Files in working folder ANSYS - Example : Modal analysis The example model is 2D rectangular model. The model meshed based on shell 63 element with Element edge length option. Shell 63 element has Real Constant with thickness and the value are same as 0.05 for all. Furthermore use material property like as steel and boundary condition to fix all degree of freedom impose at all left side node.

10 Page 10 of 47 Figure 16 Target model 11. Select interactive on the popup menu and specify working directory and jobname. Figure 17 Interactive dialog box 12. Select Structural on the Preferences for GUI filtering Preferences for GUI filtering Preferences..> Structural

11 Page 11 of 47 Figure 18 Preference for GUI filtering 13. Select Element Type, Real Constants Element type Preprocessor > Element type > Add/Edit/Delete > Add > Shell 63 > OK > Close Enter Real Constants Preprocessor > Real Constants > Add > OK Set shell thicknesses I,J,K,L as 0.05 Figure 19 Real constant for shell element 14. Enter Material property Material property Preprocessor > Material Props > Constant > Isotropic > Specify material number as 1 > OK Fill in the Young s modulus(70e9n/m2), Possion ratio(0.33), density(2710kg/m3) > OK

12 Page 12 of 47 Figure 20 Material Property 15. Create rectangular geometric entity Create Rectangle by Dimensions Preprocessor > Modeling Create > Area Rectangle > By Dimensions > Fill the x1, x2, y1, & y2 as 0.0, 0.0, 1.0, & 1.0 > OK Figure 21 Rectangle by Dimensions 16. Create area meshing using MeshTools Use line set to define element edge length. Preprocessor > Mesh Tool > Size Controls > Lines > Pick All > OK > SIZE element edge length(0.1) > OK

13 Page 13 of 47 Figure 22 Line set with Element edge length Mesh model MeshTool > Mesh > Select model > OK

14 Page 14 of 47 Figure 23 Meshed Rectangular geometric entity 17. Impose Boundary Conditions on nodes Apply at node Fix all degree of freedom of left side node Solution > Loads Apply > Structural Displacement > On node > Box > drag the window > OK > All DOF > OK

15 Page 15 of 47 Figure 24 Boundary condition 18. Perform modal analysis Set Analysis Type Solution > New Analysis > Modal Set Analysis option Solution > Analysis option Determine the Number of mode to extract and check lumped mass option You can also define Start and End frequency Perform analysis Solution > Solve > Current LS 19. Check created files Created files shown in figure 25 were stored in working directory

16 Page 16 of 47 Figure 25 Created files Caution! You can perform CMS(component mode synthesis) analysis in ANSYS 8.0 and 8.1. CMS allows you to derive the normal modes and static correction modes at once from ANSYS. It is strongly recommended that you do this CMS analysis with the macro files which are provided. There are two macro files such as RecurDyn_v80.mac and RecurDyn_v81.mac. The first is the macro file for ANSYS 8.0. The second is for ANSYS 8.1. These macro files are included in \Toolkits\Flexible input files\ansys\recurdyn_v81.mac. ANSYS 7.0 and above version may not generate element matrices file automatically. In this case, use EMATWRITE command. If you use macro file, this command is not needed. ANSYS may not generate file having material information automatically so you should type MPWRITE command in solution menu. If you use macro file, this command is not needed. If you get an error message such as cannot open file during interfacing, first translate *.emat file to text format with ANSYS. Stress Shape Interface This section informs the general process for the Stress Shape Interface in ANSYS model. Step to use the Stress Shape Interface of ANSYS. 1. Export Mode Shape. In Stress Shape Interface, you can choose FE program as ANSYS and export file. And, with Export Button pressed, RecurDyn exports the file having mode shape information. This file will be used as input file to generate stress shape matrix in ANSYS Figure 26 Export Mode Shape

17 Page 17 of Read file in ANSYS. In ANSYS, you can read the file exported in Export Mode Shape and perform static analysis with this file and then generate OUTPUT file having stress results. File > Read Input From Figure 27 Read file 3. Check created files. Check the file having such name as RDstress.out in working folder. You can modify the name of OUTPUT file in input file. 4. Import Stress Shape. In Import Stress Shape, you can choose RecurDyn/RFlex Input File, FE program and FE result file. This result file is the OUTPUT file generated in ANSYS. Figure 28 Import Stress Shape NX/NASTRAN Interface NX/NASTRAN Version RecurDyn/RFlex supports up to the version 5

18 Page 18 of 47 Interface Dialog In RecurDyn/RFlex Interface selection shown in Figure 29, select NX/NASTRAN. Figure 29 NX/NASTRAN Interface MSC/NASTRAN Interface needs punch file Punch file(filename.pch) : This file is the text file which resulted from Modal analysis. Output file(filename.out) : This file is the binary file that resulted from CMS analysis. DMAP command DMAP for Modal analysis This is the guide for Modal analysis in NX/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in NX/NASTRAN. The steps below inform you how to modify DMAP command. The example file with this NX command is included in \Toolkits\Flexible input files\nastran\ NASTRAN_normal.dat. Delete Delete commands relating to the superelements. SEALL = ALL SUPER = ALL Delete unnecessary commands in the case control section. ECHO = NONE. MAXLINES = $ Direct Text Input for Global Case Control Data. SUBCASE 1 $ Subcase name: Default SUBTITLE=Default VECTOR(SORT1,REAL)=ALL SPCFORCES(SORT1,REAL)=ALL

19 Page 19 of 47 Figure 30 DMAP command (Delete) ADD Add the following command to extract global mass and stiffness matrix COMPILE PHASE1B nolist noref alter 'call sekmr' $ MATPCH MGG,,,, / / $ MATPCH KGG,,,, / / $ Add the following commands in the case control section. ECHO=PUNCH DISPLACEMENT(PUNCH)=ALL

20 Page 20 of 47 Figure 31 DMAP command (Add) DMAP for CMS analysis This is the explanation of DMAP command for CMS analysis in NX/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in NX/NASTRAN. The steps below inform you how to modify DMAP command. The two example files with this DMAP command are included in the folder, \Toolkits\Flexible input files\nastran\. OUTPUT FILE NAME Input a name of output file. EXECUTIVE CONTROL Define Solution type. Include alt file, which makes output file written in the form for RecurDyn.

21 Page 21 of 47 CASE CONTROL Define SUPER and SEALL for Superelement. Define subcases for residuar vectors. BULK DATA Set Parameters. Specify interior grids except interface nodes. Release some degree of freedoms of interface nodes. Define data needed to perform real eigenvalue analysis with the Lanczos method. Define Scalar points. All scalar point identification numbers must be unique with respect to all other structural, scalar points. * The number of spoints is equal to the sum of normal modes and residuar vectors.

22 Page 22 of 47 Notice It is recommended that you apply a force or moment at not interface nodes but other nodes in defining a residual vector. The method for making RFI file directly RFI file is directly made by inserting the command like RECURDYNFLEX = YES. Input File Generation This section explain general processing to create NASTRAN input file with PATRAN and the method of modal analysis of NASTRAN using DMAP command. Moreover, some explanation will be added such as meshing, imposing boundary condition, some required options of PATRAN and so on Required file.zz Ver. 4.0: Punch file(filename.pch) Analysis option (Refer step 9 - DMAP command). Modal Analysis The example model is 3D hexahedron model. This example create mesh seed based on Hexa8 contains eight nodes and meshed by CHEXA element with Number of element option. Material property set like as aluminum. It show that when apply the DMAP command to the file generated from PATRAN Figure 32 Target model Steps to create NASTRAN model 5. To create NASTRAN, run Patran and create new database

23 Page 23 of 47 New database. Specify the working directory and file name. Figure 33 New Database 6. Create new geometric model Move to Geometric entity Geometric setting Action: Create, Object: Solid, Method: XYZ. Ref. Coordinate Frame: Coord0 Vector Coordinates Lists: <1 1 1> Create After set the above items, press Apply button. You can get the new model.

24 Page 24 of 47 Figure 34 Creation of model 7. Create Mesh seed on model Move to Elements. Mesh seed setting Action: Create, Object: Mesh seed, Type: Uniform. Number of Elements : 5. Curve list : select all curves by dragging window Create This method divides selected curves into Number of Element. It does not mean mesh. You can use another option that is Element Length to mesh seed. Figure 35 Mesh Seed 8. Mesh based on mesh seed Mesh options Action: Create, Object: Mesh, Type: Solid Mesher: IsoMesh Element Topology: Hex8 Solid list: Solid1 Mesh Element Topology means a kind of elements that has different node number in the element and solid list means geometric entity that performed mesh seed. After select model, Press Apply button. You can get the result windows.

25 Page 25 of 47 Figure 36 Mesh 9. Input Material properties Move to Material Material options Action: Create, Object: Isotropic, Method: Manual Input, Input material Elastic Modulus: 70e9 Possion Ratio: 0.33 Density: 2710

26 Page 26 of 47 Figure 37 Material property 10. Input element property Move to Property Element property options Action: Create, object: 3D, Type: Solid. Property set name: cubic. Input Element properties Click Alumin and OK. (Alumin is material property that created in above step.) Select Members and Add. (Member is a set of created element) Figure 38 Element property 11. Perform analysis to export NASTRAN Input file

27 Page 27 of 47 Move to analysis Analysis options Action: Analyze, Object : Entire Model, Method : Analysis Deck Enter the jobname After set the above options, select Solution Type Solution Type : Normal Modes Figure 39 Export 12. Edit exported file (jobname.bdf) Refer DMAP command editing in NASTRAN Interface. 13. Run MSC/NASTRAN Run NX/NASTRAN with exported file Select Nastran Input file and open. Run You can get the punch file. (Jobname.pch). Punch file contains mass and stiffness matrix, mode vector and frequency.

28 Page 28 of 47 Figure 40 Analysis with MSC/NASTRAN Caution! When you generate RecurDyn Flexible Input file(*.rfi) from Output file, you cannot include Stiffness matrix in option. Stress Shape Interface This section informs the general process for the Stress Shape Interface in NASTRAN model. Step to use the Stress Shape Interface of NASTRAN. 1. Export Mode Shape. In Stress Shape Interface, you can choose FE program NX/NASTRAN and input export file. And, with Export Button pressed, RecurDyn exports the file having mode shape information. This file will be used as input file to generate stress shape matrix in NX/NASTRAN.

29 Page 29 of 47 Figure 41 Export mode shape 2. Edit file. You can make NX/NASTRAN input file by including bulk data(grid, element, property and material) to the file which is exported in Export Mode Shape. Figure 42 Edit file Caution: do not include Rigid Body Element 3. Check created files. If you do analysis with the above input file in NX/NASTRAN, PUNCH file which has stress shape

30 Page 30 of 47 matrix will be generated. 4. Import Stress Shape. In Import Stress Shape, you can choose RecurDyn/RFlex Input File, FE program and FE result file. This result file is PUNCH file generated in NASTRAN. Figure 43 Import Stress Shape MSC/NASTRAN Interface MSC/NASTRAN Version RecurDyn/RFlex supports up to the version 2001 Interface Dialog In RecurDyn/RFlex Interface selection shown in Figure 44, select MSC/ NASTRAN. Figure 44 MSC/NASTRAN Interface MSC/NASTRAN Interface needs punch file Punch file(filename.pch) : This file is the text file which resulted from Modal analysis. Output file(filename.out) : This file is the binary file that resulted from CMS analysis. DMAP command

31 Page 31 of 47 DMAP for Modal analysis This is the guide for Modal analysis in MSC/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in MSC/NASTRAN. The steps below inform you how to modify DMAP command. The example file with this NX command is included in \Toolkits\Flexible input files\nastran\ NASTRAN_normal.dat. Delete Delete commands relating to the superelements. SEALL = ALL SUPER = ALL Delete unnecessary commands in the case control section. ECHO = NONE. MAXLINES = $ Direct Text Input for Global Case Control Data. SUBCASE 1 $ Subcase name : Default SUBTITLE=Default VECTOR(SORT1,REAL)=ALL SPCFORCES(SORT1,REAL)=ALL Figure 45 DMAP command (Delete) ADD Add the following command to extract global mass and stiffness matrix COMPILE PHASE1B nolist noref alter 'call sekmr' $ MATPCH MGG,,,, / / $ MATPCH KGG,,,, / / $ Add the following commands in the case control section. ECHO=PUNCH DISPLACEMENT(PUNCH)=ALL

32 Page 32 of 47 Figure 46 DMAP command (Add) DMAP for CMS analysis This is the explanation of DMAP command for CMS analysis in MSC/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in MSC/NASTRAN. The steps below inform you how to modify DMAP command. The two example files with this DMAP command are included in the folder, \Toolkits\Flexible input files\msc.nastran\. OUTPUT FILE NAME Input a name of output file. EXECUTIVE CONTROL Define Solution type. Include alt file, which makes output file written in the form for RecurDyn. CASE CONTROL

33 Page 33 of 47 Define SUPER and SEALL for Superelement. Define subcases for residuar vectors. BULK DATA Set Parameters. Specify interior grids except interface nodes. Release some degree of freedoms of interface nodes. Define data needed to perform real eigenvalue analysis with the Lanczos method. Define Scalar points. * All scalar point identification numbers must be unique with respect to all other structural, scalar points. * The number of spoints is equal to the sum of normal modes and residuar vectors. Notice It is recommended that you apply a force or moment at not interface nodes but other nodes in defining a residual vector. Input File Generation This section explain general processing to create MSC/NASTRAN input file with PATRAN and the method of modal analysis of MSC/NASTRAN using DMAP command. Moreover, some explanation will be added

34 Page 34 of 47 such as meshing, imposing boundary condition, some required options of PATRAN and so on Required file.zz Ver. 4.0: Punch file(filename.pch) Analysis option (Refer step 9 - DMAP command). Modal Analysis The example model is 3D hexahedron model. This example create mesh seed based on Hex8 contains eight nodes and meshed by CHEXA element with Number of element option. Material property set like as aluminum. It show that when apply the DMAP command to the file generated from PATRAN Figure 47 Target model Steps to create MSC/NASTRAN model 5. To create MSC/NASTRAN, run Patran and create new database New database. Specify the working directory and file name. Figure 48 New Database 6. Create new geometric model Move to Geometric entity Geometric setting Action: Create, Object: Solid, Method: XYZ. Ref. Coordinate Frame: Coord0 Vector Coordinates Lists: <1 1 1> Create After set the above items, press Apply button. You can get the new model.

35 Page 35 of 47 Figure 49 Creation of model 7. Create Mesh seed on model Move to Elements Mesh seed setting Action: Create, Object: Mesh seed, Type: Uniform. Number of Elements : 5. Curve list : select all curves by dragging window Create This method divides selected curves into Number of Element. It does not mean mesh. You can use another option that is Element Length to mesh seed. Figure 50 Mesh Seed 8. Mesh based on mesh seed Mesh options Action: Create, Object: Mesh, Type: Solid Mesher: IsoMesh

36 Page 36 of 47 Element Topology: Hex8 Solid list: Solid1 Mesh Element Topology means a kind of elements that has different node number in the element and solid list means geometric entity that performed mesh seed. After select model, Press Apply button. You can get the result windows. Figure 51 Mesh 9. Input Material properties Move to Material Material options Action: Create, Object: Isotropic, Method: Manual Input, Input material Elastic Modulus: 70e9 Possion Ratio: 0.33 Density: 2710

37 Page 37 of 47 Figure 52 Material property 10. Input element property Move to Property Element property options Action: Create, Object: 3D, Type: Solid. Property set name: cubic. Input Element properties Click Alumin and OK. (Alumin is material property that created in above step.) Select Members and Add. (Member is a set of created element) Figure 53 Element property

38 Page 38 of Perform analysis to export MSC/NASTRAN Input file Move to analysis Analysis options Action: Analyze, Object: Entire Model, Method: Analysis Deck Enter the jobname After set the above options, select Solution Type Solution Type : Normal Modes Figure 54 Export 12. Edit exported file (jobname.bdf) Refer DMAP command editing in MSC/NASTRAN Interface. 13. Run MSC/NASTRAN Run MSC/NASTRAN with exported file Select Nastran Input file and open. Run You can get the punch file. (Jobname.pch). Punch file contains mass and stiffness matrix, mode vector and frequency.

39 Page 39 of 47 Figure 55 Analysis with MSC/NASTRAN Caution! When you generate RecurDyn Flexible Input file(*.rfi) from Output file, you cannot include Stiffness matrix in option. Stress Shape Interface This section informs the general process for the Stress Shape Interface in NASTRAN model. Step to use the Stress Shape Interface of MSC/NASTRAN 1. Export Mode Shape. In Stress Shape Interface, you can choose FE program MSC/NASTRAN and input export file. And, with Export Button pressed, RecurDyn exports the file having mode shape information. This file will be used as input file to generate stress shape matrix in MSC/NASTRAN.

40 Page 40 of 47 Figure 56 Export mode shape 2. Edit file. You can make MSC/NASTRAN input file by including bulk data(grid, element, property and material) to the file which is exported in Export Mode Shape. Figure 57 Edit file Caution: do not include Rigid Body Element

41 Page 41 of Check created files. If you do analysis with the above input file in MSC/NASTRAN, PUNCH file which has stress shape matrix will be generated. 4. Import Stress Shape. In Import Stress Shape, you can choose RecurDyn/RFlex Input File, FE program and FE result file. This result file is PUNCH file generated in NASTRAN. Figure 58 Import Stress Shape I-DEAS Interface I-DEAS Version I-DEAS: up to the version 11.0 Interface Dialog In RecurDyn/RFlex Interface selection shown in Figure 59, select I-DEAS. Figure 59 I-DEAS Interface

42 Page 42 of 47 DEAS Interface needs Universal file Universal file (Filename.unv): Contains information on the global mass matrices, natural frequencies and mode shapes. This Universal file(filename.unv) is generated by running program files, RecurDyn_cms.prg Installation program files 1. Copy two program files to arbitrary folder and open RecurDyn_cms.prg file. 2. Modify the path for the second prg file, ID2RecurDyn_SM_cms.prg. This path is the place in which the second prg file exists.. Figure 60 Prg Path in RecurDyn_cms.prg 3. Modify the path where a Universal file will be generated. You have to use the same path between two prg files. Figure 61 Working Path in RecurDyn_cms.prg

43 Page 43 of 47 Figure 62 Working Path in ID2RecurDyn_SM _cms.prg Input File Generation This section explains how to generate RecurDyn Flexible Input(RFI) file from I-DEAS. Required files. Universal file(filename.unv) generated by supplied program files. Analysis option. Superelement Modal Analysis This example is a simple plate model. This plate is meshed with thin shell element with steel material property. You can get universal file through superelement analysis with prg file. This universal file has FE information which includes node, element, property, material, mass, frequency, mode shape and etc. Mode shape is consisted of the orthonormalized normal modes which are resulted from vibration normal modes and static correction modes. Figure 63 Target model

44 Page 44 of 47 Steps to create I-DEAS model 1. Run I-DEAS and create model. Move to Master Modeler. Create geometric entity. Figure 64 Creation of line Figure 65 Define surface 2. Define FE model. Move to Meshing. Define Element Select Define shell mesh. You can define mesh about plate model in Define mesh window. That is, you are able to change element type, element length and etc.

45 Page 45 of 47 Figure 66 Defining mesh 3. Make FE entity Choose meshing method Generate node and element After choose the method, select the part and enter. Then you can see the node and element numbers which are generated (Result information) in the top left side on the working window Click Yes If you don t want to auto mesh, then you can make a node wherever you want and can also generate element with this node Figure 67 Mesh geometry 4. Define DOF set Move to Boundary Conditions Create degree of freedom(dof) set Select interface nodes that will be connected to a joint or be applied by a force in the flexible body. Specify all six (translational and rotational) DOF for beam or shell elements, but only three (translational) DOF for solid elements.

46 Page 46 of 47 Figure 68 Boundary condition Figure 69 Define DOF of interface nodes 5. Run program file Move to Model Solution. Run program file, 'RecurDyn_cms.prg' After you choose the program file, click OK button.

47 Page 47 of 47 Figure 70 Read program file Enter mode number. Enter number of mode to extract in I-DEAS Prompt window. Figure 71 Input mode number and lower frequency Finishing message. If analysis successfully finished, Recurdyn.unv will be generated in working directory. Caution! DEAS interface is not able to extract global stiffness matrix from I-DEAS. So you cannot use the work related to the stiffness matrix dynamic, such as exporting dynamic correction mode and importing extra modes and so on.