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O
opavot1-Visitor
1-Visitor
March 1, 2012
Question

standard and sensibility design studies

  • March 1, 2012
  • 3 replies
  • 4293 views

Dear All

I'm working with Wildfire 4 and I want to know the strategy to use with sensitivity design , did I have to use first local sensitivity and then global sensitviity or the opposite ?

I also don't see the utility of the standard design study because with this study , I can set parameter with basic dimension and setting but in the window's result I don't have access to this parameter , so why set a parameter you can't use

Many thanks for your help

Olivier


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3 replies

J
JonathanHodgson13-Aquamarine
13-Aquamarine
March 6, 2012

I've only used global sensitivity studies, but maybe I should investigate how to use local sensitivity as well:

From reading further in the help file, it looks as though Local Sensitivity identifies the slope of the effect of a parameter, possibly several parameters at once, so it could provide a good pointer for the direction of changes.

I usually use Global Sensitivity on one parameter at a time, and use the graph to try to find the optimum value. If I'm exploring more than one parameter, I will sometimes go back and re-check the first parameter after I make a large change to the second.

Does anyone else have preferred techniques for Sensitivity studies?

O
opavot1-VisitorAuthor
1-Visitor
March 9, 2012

many thanks for your help , now I have a better view of waht I habve to do

Olivier

J
JonathanHodgson13-Aquamarine
13-Aquamarine
March 29, 2012

More of a general question to PTC, really: why are Sensitivity studies so slow?

I've got a fairly simple part here, which regenerates in the blink of an eye, and a simple static analysis in 2D Axisymmetric runs in 4.01(!) seconds elapsed.

Yet an 8-step sensitivity study (9 analyses total) has just taken 257 sec - that's 28.5 sec for each regen and static analysis. It's running on a RAM disk, so it shouldn't be waiting to write data to a disk or anything like that...

Interestingly, the total CPU time is still only 0.83 seconds, compared to the 0.42 for a single static run.

This is just an illustration - the principle extends to much longer analyses too.

S
StephenBerkeley1-Visitor
1-Visitor
March 29, 2012

Jonathan,

Which version are you running ? Wildfire 5.0 is a lot faster than Wildfire 4.0.

Steve.

P
ptc-50508571-Visitor
1-Visitor
April 26, 2013

I have also the same problem.

How can I set the local sensitivity study gragh's range?

I can't get the design parameter definition toolbar in pro engineer wildfire 5.0.

Any one who can help me about this toolbar location.

thank you!

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