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NX Response Simulation (RS): problems with units

Hello Experts!,

I am running a Dynamic Response Simulation using NX Response Simulation module (RS) under NX10.0.2.6 and I get the following error when running the Random analysis:

 

 

Apparently everything is correct, the model is in mm and mass in Tons, but in fact, the computed response is not reasonable (by say a factor of 1000). Any comment is welcome, thanks!.

 

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$* UNITS: mm (newton) $* ... LENGTH : mm $* ... TIME : sec $* ... MASS : ton (t) $* ... TEMPERATURE : deg Celsius $* ... FORCE : newton (N) $* ... THERMAL ENERGY : N-mm (milli-joule) $* $* IMPORTANT NOTE: $* This banner was generated by NX and altering this information $* may compromise the NX post processing of results. $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $* FILE MANAGEMENT $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $* EXECUTIVE CONTROL $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* ID,NASTRAN,satellite_dish_fem_sim1-sol103-rs SOL 103 CEND $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $* CASE CONTROL $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* ECHO = NONE SPC = 100 $* NX Step: Subcase - Dynamics SUBCASE 3 LABEL = Subcase - Dynamics METHOD = 103 OUTPUT DISPLACEMENT(PLOT,REAL) = ALL FORCE(PLOT,REAL,CENTER) = ALL SPCFORCES(PLOT,REAL) = ALL STRESS(PLOT,REAL,VONMISES,CORNER) = ALL $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* $* BULK DATA $* $*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $* BEGIN BULK $* $* SOLUTION CARDS $* $* NX Modeling Object: Real Eigenvalue - Lanczos1 EIGRL 103 10 0 7 MASS $* $* PARAM CARDS $* PARAM K6ROT100.0000 PARAM LAMLIM0.001000 PARAM OIBULK YES PARAM OMACHPR YES PARAM OUGCORD GLOBAL PARAM POST -2 PARAM POSTEXT YES PARAM RSCON YES PARAM RSOPT 1 PARAM UNITSYS N-MM $* $* GRID CARDS
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Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/
2 REPLIES
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Accepted by topic author Blas_Molero
‎09-14-2015 07:55 AM

Re: NX Response Simulation (RS): problems with units

Hello!,

Reading the NX RS manual I see the following:

 

 

Well, I will change back to mN-mm in the NX NASTRAN (SOL103-RS) modal solution under Advanced Solver Options and see if problem now runs OK.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: NX Response Simulation (RS): problems with units

Blas_Molero

 

To late obviously as you found the info on the units. I had a similar issue because I was trying to run my own "macro" to post process rms results and wanted to "get rid" of hte message (ie click OK all the time). I was advised that this issue on units in the RS module was known in previous release (Nx8?) and should have been fixed. But it's still there. It might be worth "investigated" if this is really the case

 

Thanks

Regards

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)