mohammad

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Posts posted by mohammad


Thanks @Prakash Pagadala but I am not familiar with transient in Optistruc.
Is there any Tutorial for that?

Hi,
I want to apply force over 5 min in each min apply 1/5 of this, I mean I want to apply 1/5 F in over first min. , 2/5F from second min to 3rd min and .....
I dont know how to do this?!
Best,
Mohammad

Hi,
I want to add temp point on my model and do analysis and then in Nastran output or fem output I can read the analysis (displacement or stress of that point), i mean in output the temp node be like a grid point or sth that analysis performed for that too.
Best,
Mohammad

12 hours ago, Prakash Pagadala said:Hi Mohammad,
Please assign material to PBEAML property and try again.
I found some of Properties didn't have Material.
Thanks so much for your help.

Hi,
I Stick into a problem.
I defined a hyperbeam in this format: standard, Nastran, and box, then I defined Pbeaml in properties and assign this beam section to it.
when I run with Optistruct, that error appear:
"PBEAML 2663 0 MSCBML0 BOX +"
*** ERROR # 1000 *** in the input data:
Incorrect data in field # 3.Please help me on this.
Cheers.

Hi,
I have model in Hyperwork and i got problem.
In Hyperwork I can get output by solver, i have tried to do this but there is somethings strange happen.
The grids parameter in optistruc fem and Nastran dat file are the same but when I apply the load to hyperview, the values are change?!
I don't know why this happen.
Here the excel file and show this.
Any comment?
Best,
Mohammad

5 hours ago, tinh said:I think you can.
Just let optistruct output nodal displacement then you can read that value to process. After that you can modify parameter in fem file or use tcl to modify model in hm
Honestly I am new in Hypermath.
This is exactly what i want, i want to read specific nodes displacement and fetch it in function then do calculation in obtain new design variables and update my model and repeat this iterations until find optimum values.
But i don't know how to read Optistruc output and how to modify fem file, this is what i want to.
Do you have sample or manual for this?
I really appreciated for your comment.
Best,
Mohammad

1 hour ago, jmpajot said:HyperMath tutorial 4030 shows an optimization example using HyperMath. You would need to replace the analytical functions with code that modifies, run, and reads data from your "HyperWorks" session. The API into a HyperMesh session is written in tcl, so a HyperMath function would need to execute tcl to modify a hm session.
There is no example I know of to do this, mostly because another Altair product such as HyperStudy can easily run optimization on a finite element model without any custom coding. It is its raison d'etre.
Thank you for your respone.
i didn't know anything about Hyperstudy, Thank you, i wanted do this with MINITAB and SPSS.
I want to develop an optimization code and apply it for structural optimization, and i should find a way to do this, i stick into problem in Msc.Nastran then I search for other way.
you mean by Hypermath, i can not access to data from optistruc i just need to find deflection of nodes and then set new parameters and again find new deflection automatically.

9 minutes ago, Prakash Pagadala said:Hi Mohammad,
I think this can be done using DRESP3. I am checking with a HM expert on the same. I shall update you soon.
Thank you so much for your consideration.
Honestly i have model in hyperwork and i wanted to do this by MSc.Nastran and matlab but my model is very complex and also i cant define any node to check the value of that in nastran output.
there for i should find a way, i search and i `m going a little through hypermath and i found out that it has optimization function just like matlab.
i just wonder that, can i connect hypermath and hyperwork together and use my model as function, then see this just program language to do my project.
Thanks,
mohammad

1 hour ago, tinh said:Hi
I am sorry. I don't know how to do
How linking do you need?
I did not ever use hypermath. I think hypermath cannot access hm database
in Hypermath i can define a function and write code and also it has functions.
instated of define a function, i would like to define my model as function.
then do optimization.

31 minutes ago, tinh said:Hi Mohammad
I am not sure optistruct can invoke user defined hypermath function for its optimizing work or not. If it can, you shoud try searching it in optistruct manual.
Hoping someone has known about this...
Thank you.
Do you know that, Is it possible to link model with fmincon?
Best,
Mohammad

Hi
I want to know that can I use Hypermath function like fmincon or I my self write code in Hypermath and link it to model in Hyperwork and do optimization?
If yes, is there any source that i can use?
Best,
Mohammad

32 minutes ago, mohammad said:Hello,
i just want to know about the difference of PBARL vs PBEAML?
I want to use size optimization of hallow rectangular beams(width, height, thickens).
which one is better?
After i have defined properties and component and nodes, how can i insert this?
Thanks.
Also i try to use PBARL, here is my file. but it has problem and the error is :
*** ERROR # 1479 *** in the input data:
Incorrectly formatted numeric data in field 9.
(If it is a character field, it should start with a letter.)*** Run terminated because of error(s) in the input data.
would you help me on this too?

Hello,
i just want to know about the difference of PBARL vs PBEAML?
I want to use size optimization of hallow rectangular beams(width, height, thickens).
which one is better?
After i have defined properties and component and nodes, how can i insert this?
Thanks.

3 hours ago, mohammad said:Hi @Toan Nguyen @Prakash Pagadala,
Thank you for your reply.
Here my model, my result and my analytical calculation.
Thanks,
I have found my mistake.
Thanks all.
Toan Nguyen likes this 
Hi @Toan Nguyen @Prakash Pagadala,
Thank you for your reply.
Here my model, my result and my analytical calculation.
Thanks,

Hello
I am just new in hyperwork.
I want to do displacement analysis for non unofrom beam as shown below.
i have 2 different cross section, i defined 2 hyperbeam, 2 properties and 2 component.
i use 3 nodes and use cbeam to connect the nodes, the define load step use optistruc to solve analysis, but my analytical value and value that optistruc is obtained are different.
i just thank that maybe i should use RBE2 in B, am I right?if yes how can i do that?
If no, what is my fault.
Big thanks
How to apply force over time in different level
in Altair OptiStruct
Posted · Report reply
Hi @Prakash Pagadala,
Thanks, I did.
Thanks.