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This video will show you how to submit a model for MD Nastran analysis
using Patran 2010
so here in Patran
I have my model where I've created my finite elements
I've applied loads and boundary conditions to properly constrain and load my model
I've also created material properties
and then applied them to the model through element properties.
So now I'm ready to perform my finite element analysis
so under the analysis tab I can see that I have options to analyze the entire model
a selected portion of my model
or just to simply create the analysis deck
or input file for MD Nastran
in this case I want to perform a full analysis and analyze my entire model
this sets the action, object, and method to to Analyze, Entire Model,
Full Run
I'll be performing a MD Nastran structural analysis
I can scroll down here on this form and click on solution type
the solution type form is where I actually define what type of analysis will be performed
in this case I want to perform a linear static
or solution 101 analysis
but this is where I would select if I wanted a solution 103 normal modes,
or buckling,
or any of these other types
of solutions
each of these solution types
has their own solution parameters
which are accessible via this form
and you can basically make changes
to the specifics of the solution
and the options available to you using this form
here the only real change that we've made is we have defined a weight-mass conversion
this means that when we defined our density
a weight density was used instead of the mass density that Nastran would be expecting
so we need to enter a conversion factor
we can do via this weight mass conversion on the solution parameters form
So we can click OK there
and then we have the option for direct text input
well we can actually add text to be passed to
our MD Nastran solver
we won't be doing that in this case
we won't be using any superelements
but next we'll click on the Subcases form
here we can see all of the Load Cases that we defined in our model
again load cases allow you to group
different sets of loads and boundary conditions together
to model different loading situations in your model
so here I have
two different load cases; this front torsion and static inertial
loading
and those have been
converted into subcases
and for each subcase in Patran
I can define additional subcase parameters,
output requests,
direct text input,
or select explicit multipoint constraints
I don't need to be doing any of that here but I will however analyze each of these loadcases
so I can basically perform two analyses in one
using the Subcase Select button
this is where I choose
which of my subcases
will be analyzed in a given run
in this case I want to run my front torsion and static inertial subcases
but I'm not interested in my default
so these
selected subcases will be analyzed separately as part of my
MD Nastran run.
So now, I'm ready to analyze
my model
I'll go ahead and enter a specific job name
so all of the files for this analysis
will contain this job name
then I'll go ahead and click Apply
Now what Patran does here
is it writes out
my Nastran input file and actually starts Nastran and begins the process of
performing the analysis.
Once the analysis complete Nastran finishes
and I can return to Patran
my next step is to take the data
that Nastran generated as part of that analysis
and attach the results into Patran
so I can continue with my post-processing
under access results,
I can choose XDB
which is the results format that was generated by that [MD Nastran] run
and I can choose to select my results file
I have the sandrail_analysis_1.xdb and I can click OK,
and Apply
and now I can see (it's always a good thing to see) in the comments that
the results file ended and was successfully attached
that indicates that I now have results
that I can go on and post-process using Patran
so I've
submitted my analysis, I've modified the parameters and got it set up how I wanted
submitted it to Nastran, had Nastran run it, and now I've brought the results back
into Patran
and just to verify that I can click on Results
and see that I now see these different result cases available,
one for each of the
subcases
that I
ran
as part of that analysis.