Error while creating .fem in optistruct and .h3d body for motionsolve/view in OptiStruct
hello
i m trying to make h3d from .fem. i m doing as it is tutorial in MotionView/MotionSolve which are available @ http://www.altairuniversity.com/learning-library and search for motorcycle.
i created my own motor cycle frame in optistruct then i meshed it and created rigid components.
like
then i followed the Generating a Flexible Body for use in Altair MotionSolve - RD-4030
https://www.sharcnet.ca/Software/Hyperworks/help/hwsolvers/hwsolvers.htm?rd4030.htm
then i did optistruct and created .fem file
while importing that file
error message came:
*** OptiStruct defaults set from:
install config file: C:\Program Files\Altair\13.0\/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).
2 PARAM(s) were set:
COUPMASS,-1
CHECKEL ,YES
*** INFORMATION # 741
No need to constrain the rotational d.o.f. of this dependent grid.
RBE2 element id = 1309054
independent grid id = 237100
dependent grid id = 5
This is because there isn't any stiffness and load on the rotational
d.o.f. of the dependent grid.
*** INFORMATION # 741
No need to constrain the rotational d.o.f. of this dependent grid.
RBE2 element id = 1309054
independent grid id = 237100
dependent grid id = 6
This is because there isn't any stiffness and load on the rotational
d.o.f. of the dependent grid.
*** INFORMATION # 741
No need to constrain the rotational d.o.f. of this dependent grid.
RBE2 element id = 1309054
independent grid id = 237100
dependent grid id = 7
This is because there isn't any stiffness and load on the rotational
d.o.f. of the dependent grid.
*** INFORMATION # 742
The dependent rotational d.o.f. of this rigid element is removed.
RBE2 element id = 1309055
independent grid id = 237106
a dependent grid id = 83333
This is because there is no need to constrain the rotational d.o.f. of
any of the dependent grids.
*** INFORMATION # 742
The dependent rotational d.o.f. of this rigid element is removed.
RBE2 element id = 1309056
independent grid id = 237103
a dependent grid id = 14115
*** INFORMATION # 743
The total number of grids whose rotational d.o.f.s need not be
constrained in RBE2 elements is 1468.
*** INFORMATION # 743
The total number of rigid elements, whose rotational dependent d.o.f.
are removed because there is no need to constrain those d.o.f., is 2.
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 1
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 2
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 3
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 4
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 5
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 6
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 2
component = 1
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 2
component = 2
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 2
component = 3
SPC set id = 0
*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 2
component = 4
SPC set id = 0
*** More of ERROR messages # 176 were suppressed...
then
.h3d not created
please help me
my objective is do optimization of my motorcycle frame
and to apply loading condition i want to use motion solve to extract loads
then do topology optimization to get new optimized design.
exactly same as
my problem is i m not able to create h3d file
i want to know what load steps i use to create successful result
regards
santosh
Answers
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Hi Santosh Maharana,
The rigid elements used for Interface nodes of flexbody should be RBE2 type (not RBODY). 1D>rigids> to create rigid spiders set nodes multiple nodes for dependent, and calculate node for independent. Also, make sure to set the elem types to RBE2.
This tutorial might help you: MV-2010: Flexbody Generation using Flex Prep and Optistruct
ERROR # 176 is because SPC constraints were applied on dependant nodes of rigid elements, which is not allowed.
My guess for INFORMATION # 741 is because the rotational d.o.f. were constrained on solid elements, which do not have rotational DOF. INFORMATION # 742 & 743 explain this is unnecessary and they were automatically corrected.
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what card i have to put and what load collector will i use to follow the above process. 
i corrected to RBE2. can you tell me what load collector and card i have to input to follow the above tutorials.
can you tell me the steps. @Ivan
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Altair Forum User said:
<?xml version="1.0" encoding="UTF-8"?>
what card i have to put and what load collector will i use to follow the above process. <?xml version="1.0" encoding="UTF-8"?>
i corrected to RBE2. can you tell me what load collector and card i have to input to follow the above tutorials.
can you tell me the steps. @Ivan
Hi,
Do you want to convert to flex body for MBD analysis?
Did you follow the tutorial?
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but i wont able to create .fem file from optistruct
it needs load steps
how to create
how can i imports it with out any error
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For creating a flexbody you need material and property details.
You can also refer to this MV-2021: Simulating an Automotive Door Closure Event
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Remove all SPCs and loads, and loadsteps and try again,
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If you want to create a flex body for MBD analysis which can be used by MotionSolve, please export the deck without any loadsteps and use FLEXPREP tool in MotionView.
Just retain Mesh, properties and material. No loads or BCs
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my file is in .hm format how can i convert or what to do to get .fem so that i will follow other steps which is available in tutorials
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Make sure you are in OptiStruct user profile,
Go to File menu>> Export>> Solver deck
<?xml version="1.0" encoding="UTF-8"?>
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i know that one but i m need to do further optimization after analysis that why i imported my file to hyper mesh then mesh is generated and RBE2 created where i will join suspension in hyper view from where i get load .Mnf file then again i use this for optimization in Optistruct.
my objective
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Can you please share your organization details and your contact email ID(official)?
Please avoid posting phone numbers on the open forum.
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what value i have to put in interface node list and other like cut0ff type and values . will i tick perform stress recovery and strain recovery 0 -
If at all you are interested in load extraction, you can do that with a rigid body as well
If you want to study the deformation, you need a flexible body. Interface nodes are those where flexible body connects to the rest of the model.
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*** ERROR # 176 ***
A dependent d.o.f. of rigid elements is constrained in an SPC set.
grid id = 1
component = 1
SPC set id = 0what is this?
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HI,
please check your mail and reply to the same.
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As suggested,
Please don't have any loads or BCs for creating a flexible body. The Dofs of RBE2 has nothing to do with the SPCs and loads.
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I m not able to get interface node automatically like explained in
example 
after creating RBE2 spider my computer won't able perform after
step3 save and exit
if i try manually input my interface nodes by tool>> find >> nodes >> number
on clicking ok
facing error on flex-preparation
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Can you please share the .fem file?
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sir please check mail.
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As per our talk i m sending you my design space file of motor cycle.i won't able to create input my interface nodes while creating flex preparationsame thing i am trying in solidthinking inspire in motion, wont able get FEA analysis.
https://drive.google.com/file/d/1dN7enQkP2hVbMmvJynrDCX7VJBmhmVBT/view?usp=sharing
https://drive.google.com/file/d/0Bx_nUMIj4agbUmhyTUhvVGhYVFN2Z1h3TDlKNGhkbW5uY2c0/view?usp=sharing
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i tried both in HYPERWORKS and INSPIRE.
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As said, please delete the SPCs and also the mesh quality is also bad. Please refine the mesh and try again.
I remeshed the model with element size of 10 and I am able to create a flexbody without any errors. But with the element size of 10, there are few areas which are not captured completely.
You may have to mesh carefully.
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what this means?
i m attaching a out put warning message after flex preparation.
i think i have to refine the mesh.
please tell me if any other problem.
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Yes, as suggested, refine the mesh and try again.
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after following these steps i found this
i successfully created .h3d
but it size is of 3gb
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3GB
/emoticons/default_ohmy.png' srcset='/emoticons/ohmy@2x.png 2x' title=':o' width='20'>
I have made flex file which is 30MB.
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you read the file i attached to you!
you already done this type of project and its your video which i m following. tell me the procedure possibilities where i have to do more concentration.
i m attaching the new same mesh File which i created it looks different from other one.
i transfering design45.fem via FILETRANSFERLINK.
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Altair Employee
