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MSC Nastran Community Forum Model reduction using SOL103, DMIG PCH Format

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Model reduction using SOL103, DMIG PCH Format

prasad.guduguntla.external over 7 years ago

Hello,

I performed model reduction using SOL103 DMIGPCH format.

EIGRL method

GRAV or ACCEL loads, Point Loads are applied on the reduced model, Analysis is performed using SOL101.

From the f06 file, OUTPUT from Weight check matches to the physical model.
OLOAD resultant, SPC force resultant, displacements from the GRAV loads shows zero. What could be the reason?

for your info:

I performed the same process OP4 format, very thing works out well.

Thanks,

Prasad.

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0 prasad.guduguntla.external over 7 years ago

Hi Don,

Thanks for your reply.

My requirement is to deliver the SE with out any loads included. So that the loads could be applied during the assembly run. The method you suggested to include the loads during the creation of SE, I already tried it before and it works.

I found the solution to my problem.

(As mentioned previously, i applied the GRAV loads on the condensed model and i don't see any result in terms of OLOAD and SPC FORCE resultant.)

During the Assembly run, In the BULK data first I defined the Load card and then *.asm, *.pch files.. This leads to the zero values in OLOAD and SPC resultant output.

In the assembly run, modified the order of cards and it works . --> After the condensed includes, i defined the load card.

To my knowledge, Nastran considers all the BULK data entries…irrespective of order of cards.

Is there any defined order to include the cards during the usage of condensed models?

Thanks,

Prasad.
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0 prasad.guduguntla.external over 7 years ago

Hi Don,

Thanks for your reply.

My requirement is to deliver the SE with out any loads included. So that the loads could be applied during the assembly run. The method you suggested to include the loads during the creation of SE, I already tried it before and it works.

I found the solution to my problem.

(As mentioned previously, i applied the GRAV loads on the condensed model and i don't see any result in terms of OLOAD and SPC FORCE resultant.)

During the Assembly run, In the BULK data first I defined the Load card and then *.asm, *.pch files.. This leads to the zero values in OLOAD and SPC resultant output.

In the assembly run, modified the order of cards and it works . --> After the condensed includes, i defined the load card.

To my knowledge, Nastran considers all the BULK data entries…irrespective of order of cards.

Is there any defined order to include the cards during the usage of condensed models?

Thanks,

Prasad.
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