HI,
I don't view a model browser in a panel.when i go in " view> model browser" to "flag" the option,i read this error message!
https://www.dropbox.com/s/y7snt7k19q0kx36/ERROR%20IMAGE.JPG
HELP ME!!
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MODEL BROWSER ERROR
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Re: Element type of Honeycomb core in Composite Optimization
Hi,
thank you very much for your help. I tried an Composite Optimization of sandwich structure again by using a simple model, "torsion_plate.hm (\tutorials\hwsolvers\optistruct)". Specifically I used UD CFRP and Woven-fabric CFRP as MAT8 (shell element), on contrast aluminum honeycomb core as MAT9 (Solid element). However it didn't work correctly and the following error message came up;
*** ERROR 14: Missing MAT # 4 referenced by PLY # 4,
(existing MAT with this ID is of incorrect type).
I couldn't get this error. Could you please tell me how I should solve it?
And honestly, if possible, I'd like to use shell elements for all materials including aluminum honeycomb core because it could be hard to connect shell elements with solid elements properly due to different DOFs. Furthermore this article, on line 3 of page 3, shows that honeycomb material is represented by shell elements. (http://www.altairhyperworks.co.uk/technology/files/papers/2000/paper14.pdf)
I would appreciate it if you would give me hints. Thank you in advance.
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Re: MODEL BROWSER ERROR
fatox,
we must start with deleting the settings files, please delete the settings files following the procedure in this post http://www.altairuniversity.com/support-forum/?mingleforumaction=viewtopic&t=251
Please also tell us the operating system you use and the version you are using, http://www.altairuniversity.com/support-forum/?mingleforumaction=viewtopic&t=252
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Re: Err: 5
Burkey,
I am afraid you will need to manually edit the regions that are not possible to rectify using equivalence to ensure a good quality enclosed surface mesh.
By solid option i mean the option in cfd tetramesh to use the solid entity type. see image
![Image]()
If solids are used as input for CFD tetrameshing, use the 2D parameters subpanel to set the default traits of the 2D meshes that are generated on the surfaces of the components that you wish to tetramesh. This 2D mesh is then used as the basis from which the internal tetras are generated.
![Image]()
If solids are used as input for CFD tetrameshing, use the 2D parameters subpanel to set the default traits of the 2D meshes that are generated on the surfaces of the components that you wish to tetramesh. This 2D mesh is then used as the basis from which the internal tetras are generated.
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Display fixed points
Hi,
I changed by accident the display method of the fixed points from full spheres to small circles. How can i revoke it?
![Image]()
![Image]()
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Re: Display fixed points
Hi Tobias,
Maybe you have just switched to the wireframe geometry mode, switching back to shaded should shade the fixed point too,
![Image]()
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number of CPU´s: Optistruct with HyperStudy
Hi there,
i am using HyperStudy with optistruct solver to do an optimization. Is there a possibility to change the number of cpu´s used by the solver?
thanks
Thomas
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Re: How to change the display format of numbers in MV?
Hi Rahul,
Thank you for your answer. The version and update information can be found at the end of this reply.
The problem is not the input of small numbers, but the fact that the small numbers are displayed as 0.0000 if they are less than 5e-4, e.g.
- in "Inertia Properties" fields concerning bodies, or
- in "Dataset Property Data" fields.
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Re: number of CPU´s: Optistruct with HyperStudy
Hi Thomas,
while doing your study, in the Define Model step, we can type in solver run options into the Solver Input Arguments field. For OptiStruct, this field might contain $file followed by the run option
Since we need -cpu or -proc or -nproc or -ncpu or -nt to specify the number of cores for an smp solution, the solver argument field could read $file -ncpu 4 for example.
Please try with the above and let us know what you find.
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Re: how to solve the ZERO OR NEGATIVE VOLUME problem when using very soft material?
Thanks !
I have sent you the files through secure file drpbox. Please take a look...
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Re: How to change the display format of numbers in MV?
Hi Matthias,
I see that this is due to the version you are using, please upgrade to the latest version of HyperWorks especially to HyperWorks Desktop 12.0.110 and you should see a scientific notation in the panels.
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CBUSH / PBUSH
Hello together,
I have two questions concerning the PBUSH card which I am using during a frequency response analysis:
1. I tried to type in the keyword RIGID in the K field of the PBUSH card. this didn't work, so I tried the same directly in the solver deck. But I got an error message during the import. Apperently the RIGID entry is causing the error.
I read this in the userguide. What did I do wrong there?
2. Is there some more Information about the behavior of the PBUSHT card? The userguid just tells me that it is making the K entries of my PBUSH card frequency dependent. I simply like do understand what is happening there?
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Re: number of CPU´s: Optistruct with HyperStudy
Thanks, I will try and provide you with the findings!
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Pairing Constraint in Shuffle Optimization
Hello,
the question arised whether it is possible to define more than one pairing constraint in the Shuffling Optimization of a Composite Material. Currently this is not possible, as the pairing constraint is limited to 45/-45 degree fibre orientation angles of the composite. Defining any other fibre orientation angle within this constraint will lead to an error message:
*** ERROR # 1754 *** in the input data:
BALANCE and PAIR constraints are only valid for 45.0 and -45.0
orientations at this point.
With best Regards
Jan
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Re: CBUSH / PBUSH
Student_1739
Solver decks are very sensitive to syntax and in general must be carefully edited, this as you found is the cause for the error on import.
To make the stiffness of your cbush in a particular direction to be rigid we can use the pbush property and select rigid options for that particular direction with a RIGID entry in that dof, this is done by selecting the KiRIGID option when you card edit the pbush property. see image below -
![Image]()
When we choose pbusht as the help says we intend to model stiffness depending on frequency, so each tabled entry in the kline of the pbusht describes how the stiffness of the cbush element varies with respect to frequency in that direction.
![Image]()
The CBUSH element is a generalized spring and damper. Stiffness and damping can be specified for 6 degrees-of-freedom, 3 translations and 3 rotations using the pbush or pbusht cards.
The idea behind these cards is that when you do a transient analysis you need nominal stiffness values only and these the solver can get from pbush, however when you need a frequency response analysis you will require frequency dependent properties i.e. frequency dependent stiffness in such a case you will use pbusht along with a tabled.
so let us say you are doing a frequency response analysis, and you know that stiffness of your spring varies with frequency like 25 for 1hz and 50 for 2 hz etc,
then you will create a tabled with data as 1,25 . . . 2,50 etc > refer this tabled in a particular dof in pbusht > then the frequency response run will take stiffness of 25 when the load is at 1hz etc.
When we choose pbusht as the help says we intend to model stiffness depending on frequency, so each tabled entry in the kline of the pbusht describes how the stiffness of the cbush element varies with respect to frequency in that direction.
The CBUSH element is a generalized spring and damper. Stiffness and damping can be specified for 6 degrees-of-freedom, 3 translations and 3 rotations using the pbush or pbusht cards.
The idea behind these cards is that when you do a transient analysis you need nominal stiffness values only and these the solver can get from pbush, however when you need a frequency response analysis you will require frequency dependent properties i.e. frequency dependent stiffness in such a case you will use pbusht along with a tabled.
so let us say you are doing a frequency response analysis, and you know that stiffness of your spring varies with frequency like 25 for 1hz and 50 for 2 hz etc,
then you will create a tabled with data as 1,25 . . . 2,50 etc > refer this tabled in a particular dof in pbusht > then the frequency response run will take stiffness of 25 when the load is at 1hz etc.
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OptiStruct crashes with "Minimum Member Size Control"
Hey,
I tried to perform a topology optimization with the Minimum Member Size Control. The check-run ran for several hours without any reaction until i killed the job. A normal optimization-run causes a crash of OptiStruct after a few minutes. And without a MINDIM value OptiStruct is able to find a feasilble design.
Any idea what i am doing wrong?
System:
HyperWorks 12.0
Windows 7 64-bit
Intel Xeon W3565 @ 3.20GHz
18GB RAM
Model:
Grids: 283'526
Elements: 330'749 (most Hex8)
DoF: 850'572
8 Gravity LoadSteps and one EIGRL
Objectiv: minimize weighted compliance
Constraints: 1st Eigenfrequency > 70Hz, Massfraction < 0.2
Thanks for any help.
P.S.: I'm new here. So tell me if you need more Information.
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Re: OptiStruct crashes with "Minimum Member Size Control"
Hi Linus,
I need to know the average element size and the mindim value you are entering,
I wonder - is it 3 times the average element size? if it is larger how many times the element size is the mindim?
we should start with the out file, so please attach that.
Is there any error in the out file? any readjustment of your mindim by optistruct automatically?
The element size seems large so make sure the mindim is reasonable, In general it is a waste of computing resource to target a very large MINDIM with a fine mesh.
In the case of a large mindim also try and use a larger volfrac to ensure a reasonable solution.
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Re: OptiStruct crashes with "Minimum Member Size Control"
The average element size is about 3mm and the MINDIM is 6mm. So twice the element size.
This is the *.out file of the optimization run with MINDIM. But it is not very helpful i guess.
************************************************************************ ** ** ** ** ** OptiStruct 12.0.210 ** ** ** ** Design and Optimization Software ** ** from Altair Engineering, Inc. ** ** ** ** ** ** Windows 7 Workstation (Build 7600) WI18AC36025 ** ** 8 CPU: Intel(R) Xeon(R) CPU W3565 @ 3.20GHz ** ** CPU speed 3200 MHz ** ** 16208 MB RAM, 21413 MB swap ** ** ** ** Build tag: 0682690_5533120_Ce64RBW8UH12M:82341-000 4000020004001 ** ************************************************************************ ** COPYRIGHT (C) 1996-2013 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\12.0\/hwsolvers/optistruct.cfg. NOTE # 9199 MSGLMT=STRICT is active, all messages will be printed. You can suppress some less important warning messages by use of MSGLMT=BRIEF or UNREF (in config file or in the input data). NOTE # 1847 AUTOMATIC SCREENING is activated. Use "DSCREEN,AUTO,OFF" to turn off this effect.I would also upload the *.out file of the run without MINDIM but in code-form is it to long. Is there an other possibility of uploading files?
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Re: OptiStruct crashes with "Minimum Member Size Control"
Linus,
In that case I may have to review the model file itself, please use the secure dropbox below to send the model
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Re: Request the force from the rigid element
Hello,
Thank you very much for the options. This is a wheel assembly, and there is a RIM and a center part, and they are fixed together with screws. The result with all option was 3E-4, that seems quiet low. What is the unit of these forces? Thanks a lot,
Sanyo
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