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thermal analysis

Solution Partner Pioneer Solution Partner Pioneer
Solution Partner Pioneer

 what are all the important parameters should know before starting thermal analysis?

 

if anyone have thermal analysis tutorial related to PCB analysis please share?

 

 

regards,

shreeharsha

7 REPLIES 7

Re: thermal analysis

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

Take a look to this TUTORIAL in the IBERISA WEB Support page of the heat transfer analysis of a PCB using FEMAP with NX NASTRAN:

http://www.iberisa.com/soporte/femap/termico/Heat_Transfer_from_Chip_to_PCB.htm

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: thermal analysis

Experimenter
Experimenter

Hey, I just wanted to drop by and give a huge THANK YOU!

 

I've been struggling with the heat transfer analysis of a PDB for a while now but the results didn't measure up with any of my actual experiments 8I've been using tools by linseis which are usually crazy accurate, so I was wondering why my simulation was so different to my actual results). After reading that tutorial, I got a much better grasp of PCB. So thanks a ton.

Re: thermal analysis

Experimenter
Experimenter

Hello Bias,

In step 11, you created a temperature constraint 25C further away from the PCB. I am a bit confused as to how you came up with this?

For example, suppose the PCB is as small as the active region (where the colours are in the results) , how would you define a temperature constraint?

Or in other words, if the chip is generating more heat, the 25C constraint region will not be 25 in real life, how to come up with a temperature constraint in this sceneario?

Thank you in advance.

Re: thermal analysis

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

A temperature constrain is that, a "constraint", is a way to prescribe "explicitly" a well know boundary condition value that exist along a curve edge, a constant value. In this particular case is part of the problem description, is a know condition, in real life it could be different, surely pure constant values don't exist, 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: thermal analysis

Experimenter
Experimenter

Hi Blas,

Thank you for the reply.

I have a similar problem where this PCB has multiple chips which generates heat. No curve or edge on the PCB will be at 25C or at any known temperature.

How would you define a temperature constraint for this problem? Please advice. Thanks.

Re: thermal analysis

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Jerad,

"Temperature constraint in a curve" is a resource of any FEA code that allow you to prescribe a "know" constant temperature in a curve, but in real life surely this is an unknow, but you have other thermal sources like applying in surfaces convection, heat flux, heat power, etc.., this is simply a problem example.

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: thermal analysis

Experimenter
Experimenter

Blas,

Thank you very much for the explanation. Pardon me, I am new to heat transfer analysis.

Regards,

Jerad