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Found 2 results

  1. Hello everyone, currently I have some issues with modeling a flexible shaft. I've imported a fem model of my shaft in MotionView via FlexPrep. During simulation the model definitely can bend, but it seems to have an infinite torsional stiffness. These are the material specifications I made. I chose a very soft material, so that there should definitely be some kind of torsion. The property-card just refers to the material "Gummi" and defines the shaft as "PSOLID". This is the shaft I want to use as a flexible shaft in MotionView: This is the MotionView model I've created with the flexible shaft. To import the shaft as a flexible body I've used the Flexprep-Tool. The two masses (about 20kg and 40kg) are rigid bodies and connected to the shaft with fixed joints. The shaft is mounted on two revolute joints, each at the center of one side of the shaft. The input is a sinusoidal rotational force at the center of the green mass and I measure the rotational displacement about the x-axis at the front and rear end of the shaft. I expect a phase shift between the measured angle at the input and at the output due to the elastic properties of the shaft. These are the visualised results of simulation: The shaft is definitely flexible and there also seems to be a torsion, but when I visualise the results in HyperGraph 2D, I get the following results: The upper curve is the result of the measurement at the front and rear end of the flexible shaft. It's exactly the same curve. F8 is the difference in the angular displacement at the forn and rear end, which is exactly zero. The lower curve is the result of a reference measurement with a rigid shaft. Angular displacement at the front and at the rear end are - as expected - exactly the same. Are there any additional solver options I have to activate or special things I have to consider while modelling the shaft to be able to measure a phase shift in the rotational displacement? I urgently need some good advice! Thank you in advance! Your sincerely
  2. Hi dear support Forum! I want to automate the process of converting *.fem to *.h3d files for the FlexBody option in MotionView. In tutorials the FlexPrep interface in MotionView is presented, which is ok but not feasible for large quantities of files. Therefore I want to automate the flexprep step, which also should be possible according to: https://altairhyperworks.com/hwhelp/Altair/2017/help/mv/mv.htm?flexprep_mv.htm From the help section I've interpreted the command line to be: "C:/Program Files/Altair/2017/io/translators/bin/win64/flexprep" "C:/Temp/mbd/Body1.fem" "C:/Temp/mbd/Body1.h3d" CB +17079+17080 10 -STRESS -STRAIN Which is identical to what the user interface in MotionView calls in the file: C:\Program Files\Altair\2017\utility\mbd\custom_wizards\flexpreptk.tcl The conversion works perfectly in MotionView: ****************************************************************************** ** ** ** Altair Flexible Body Preprocessor ** ** ** ** ** ** Flexible Body Modal Synthesis and Data Translation Software ** ** from Altair Engineering, Inc. ** ** ** ****************************************************************************** ** Executable flexprep 2017.2.0.16 ** Time of Build 17:27:47 ** Date of Build Jul 25 2017 ** Copyright (c) 1996-2017 Altair Engineering, Inc. All Rights Reserved. Contains trade secrets of Altair Engineering, Inc. Copyright notice does not imply publication. Decompilation or disassembly of this software is strictly prohibited. ****************************************************************************** **INVOKING <CRAIG-BAMPTON MODES> PROCEDURE** (ORTHOGONALIZED FIXED-INTERFACE EIGEN AND CONSTRAINT MODES) RUNNING FLEXPREP USING OPTISTRUCT ... ****************************************************************************** ** Time of build : 15:07:05 ** Date of build : 06/16/17 ** Time of build : 15:17:26 ** Date of build : 06/16/17 ** Time of build : 15:08:18 ** Date of build : 06/16/17 Total Translation Warnings and Errors: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Warnings: 0 Errors: 0 ************************************************************************ ** ** ** ** ** OptiStruct 2017.2 ** ** ** ** Advanced Engineering Analysis, Design and ** ** Optimization Software from Altair Engineering, Inc. ** ** ** ** ** ** Windows 10 (Build 9200) DESKTOP-4115EKL ** ** 4 CPU: Intel(R) Core(TM) i7-3540M CPU @ 3.00GHz ** ** 3804 MB RAM, 9346 MB swap ** ** ** ** Build tag: 0872785_9433172_Ce64RBW8UH14M:131848-2 4000 ** ************************************************************************ ** COPYRIGHT (C) 1996-2017 Altair Engineering, Inc. ** ** All Rights Reserved. Copyright notice does not imply publication. ** ** Contains trade secrets of Altair Engineering, Inc. ** ** Decompilation or disassembly of this software strictly prohibited. ** ************************************************************************ *** OptiStruct defaults set from: install config file: C:\Program Files\Altair\2017\/hwsolvers/optistruct.cfg. Much more mumbu jumbo down here..... But when I run the line in command prompt I get the following error: ****************************************************************************** ** ** ** Altair Flexible Body Preprocessor ** ** ** ** ** ** Flexible Body Modal Synthesis and Data Translation Software ** ** from Altair Engineering, Inc. ** ** ** ****************************************************************************** ** Executable flexprep 2017.2.0.16 ** Time of Build 17:27:47 ** Date of Build Jul 25 2017 ** Copyright (c) 1996-2017 Altair Engineering, Inc. All Rights Reserved. Contains trade secrets of Altair Engineering, Inc. Copyright notice does not imply publication. Decompilation or disassembly of this software is strictly prohibited. ****************************************************************************** **INVOKING <CRAIG-BAMPTON MODES> PROCEDURE** (ORTHOGONALIZED FIXED-INTERFACE EIGEN AND CONSTRAINT MODES) RUNNING FLEXPREP USING OPTISTRUCT ... ****************************************************************************** 'optistruct.bat' is not recognized as an internal or external command, operable program or batch file. '"optistruct.bat"' is not recognized as an internal or external command, operable program or batch file. Total Translation Warnings and Errors: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Warnings: 0 Errors: 0 Therefore I changed the working directory in the command prompt to the location of the optistruct.bat, but that yielded this error and the optistruct part doesn't start: ****************************************************************************** ** ** ** Altair Flexible Body Preprocessor ** ** ** ** ** ** Flexible Body Modal Synthesis and Data Translation Software ** ** from Altair Engineering, Inc. ** ** ** ****************************************************************************** ** Executable flexprep 2017.2.0.16 ** Time of Build 17:27:47 ** Date of Build Jul 25 2017 ** Copyright (c) 1996-2017 Altair Engineering, Inc. All Rights Reserved. Contains trade secrets of Altair Engineering, Inc. Copyright notice does not imply publication. Decompilation or disassembly of this software is strictly prohibited. ****************************************************************************** **INVOKING <CRAIG-BAMPTON MODES> PROCEDURE** (ORTHOGONALIZED FIXED-INTERFACE EIGEN AND CONSTRAINT MODES) RUNNING FLEXPREP USING OPTISTRUCT ... ****************************************************************************** Total Translation Warnings and Errors: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Warnings: 0 Errors: 0 There must be some sort of environment variables missing for flexprep to run perfectly. Hence the question: Is there a workaround? Thank you in advance and best regards!
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