Problem of size optimization's desvar
Altair EmployeeI want to ask at this time I do the size optimization
but at the shell property, I defined the T(thickness)=0.8mm
and at the size panel I need to defined the initial value, lower bound and upper bound
I want to ask at here initial value and property thickness are different
so which is the original thickness of my model?
and if my lower bound is 0.1, so it means my model's thickness the lowest is 0.1 mm?
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Answers
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Hi,
Your shell thickness will be 0.8. Please correct the initial value and update the same.
Lower bound 0.1 means your model size can go upto 0.1 and not below that. So from the above picture your shell thickness should be bound between 5 and 0.1.
You can change the upper and lower bounds, update the DSIZE according to your requirement.
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Altair Forum User said:
optimization
but at the shell property, I defined the T(thickness
really thanks to you reply my question
I also want to ask you
where to find the DSHAPE or DVGRID card ?
Do they also in the optimization panel? I can't find it
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I also want to ask you
where to find the DSHAPE or DVGRID card ?
Do they also in the optimization panel? I can't find it
sorry at last reply I enter so fast
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Altair Forum User said:
sorry at last reply I enter so fast
No problem.. Happy to help
Shape functions are defined through DVGRID card and DSHAPE Defines parameters for the generation of free-shape design variables.
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Do you mean the DVGRID card and SHAPE are in here?
<?xml version="1.0" encoding="UTF-8"?>
Can you show me the path of them? Really thanks to you
like ex : Analysis > optimization > free shape ...
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DSHAPE is Free-shape design card where as DVGRID is created for the nodes used for shape optimization.
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I probably understand, so I choose Analysis > optimization > free shape means DSHAPE
and gridcon is DVFRID
is that right?
<?xml version="1.0" encoding="UTF-8"?>
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Hi,
DVGRID has nothing to do with FREESHAPE. GRIDCON is a list of grids with associated constraints are to follow.
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Altair Forum User said:
DVGRID has nothing to do with FREESHAPE. GRIDCON
OK
Analysis > optimization > free shape means DSHAPE
I finally understand. Really thanks to you!
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Because I just a beginner so I have many problems
At here I just say sorry to you
At here I want to ask if I have three .fem file to solve
how to I set at Optistruct solver
and I also want to ask you how to mail to you because I can't message to you.
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Altair Forum User said:
At here I want to ask if I have three .fem file to solve
I am sorry, but what is three.fem?
.fem file to solve freeshape and shape?
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three means quality
If I have three qualities of fem file
Sorry I explain not completely
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Size, shape and Free shape?
If you have access to help, you can refer to tutorials
<?xml version="1.0" encoding="UTF-8"?>
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Thanks to your apply @Prakash Pagadala
It should be my mistakes of speakMy question is if today we are using the solver
we have a lot of file to solve. Now we know if we want to solve
we need to set input file to solve, but it can solve one file at one time
I want to know we can solve lots of files just only run one time and it will run lots of files
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I want to ask
is the free size optimization need to set the object reference : minmax for von-Mises constraint?
<?xml version="1.0" encoding="UTF-8"?>
and why we can't only choose the max or min
and the object pos reference and neg means the max stress and min stress?
<?xml version="1.0" encoding="UTF-8"?>
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HI,
You can choose either max or min using an Objective function instead of DOBJREF.
Goto>> Optimization>> Objective>> Min/Max
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when I set min without obj reference
<?xml version="1.0" encoding="UTF-8"?>
it will be show this fail :
*** ERROR # 1812 ***
Multiple responses are assigned to the DESOBJ objective function.
A MINMAX/MAXMIN objective function definition with DOBJREF should
be used instead.
Number of responses = 810 -
Can you share the model file, please?
Also, it is not a good idea to use Stress as response with Freesize and topology optimization.
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This is the practice file
I will remember your suggestion thanks!
this is the file
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@Prakash Pagadala Thank you apply my question
I want to ask two problems:
1. what is mean about minmax, we set this so our object is min or max?
2. what is mean about negative reference
I have read the help but still don't know
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MinMax means Minimize Maximum of a value. So if it is a stress response MinMax will minimize the maximum stress
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I also have read the files but still not understand
Does there have explanation more clearly? Really thanks
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Your apply is at the next page so I first can't find it
thanks to your apply
But how can we explain the maximum minimum, I know the MinMax
and I want to ask why you set this, really thanks
I want to know the positive and negative reference value mean
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@Prakash Pagadala thanks you every time apply my question
I am looking for every information about neg and pos reference value explanation
but I still don't know in your gived file.
Do you have any explanation about the two value? Thanks a lot
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Hi,
MinMax means minimize maximum of a response. For example, there are 8 elements and 8 elements have different stress in a model.
The objective is to minimize the maximum stress. Here we use MinMax(Stress), which means minimize maximum stress among those 8 elements.
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