Re: Beam shear and moment measures
Morning Mats, It's not just me then. I was contemplating mechanism dynamics but we don't have flexible beams. To develop the spring idea a bit further ... What if the beams are connected by very stiff...
View ArticleRe: Beam shear and moment measures
Charles, Yes, this sounds like a good strategy. I'm not sure if advanced springs can have zero length, but I guess it should be possible to give it a short, insignificant length. /M
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Missing the maximum, global sens and optimiser
Hi, Bear with me, a fairly long question and based on the global sensitivity plot below Can anyone suggest how to find C and D? Is there a function that can be used as a computed measure in a global...
View ArticleRe: Beam shear and moment measures
Mats, We can't have zero length springs. The points would have to be very close.
View ArticleRe: FEA...How to define roller bearing constraint in mechanica ?
I am having difficulty in creating rigid link. I am getting following error message."The dependent side geometrical references may be in conflict with another rigid/weighted link or constraint"I have...
View ArticleRe: Mechanica results variability
Thanks Gunter. I pretty much always select "Remesh after update" (and even when I don't it usually seems to remesh anyway) so this shouldn't be a factor.
View ArticleRe: Mechanica results variability
Thanks Mats. I do use "over selected geometry" measures most of the time these days. However, this doesn't address the basic issue that running the same model gives different answers depending on...
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Re: How to eliminate singularities from the model?
The short answer is "fillet all your sharp internal corners"!
View ArticleRe: Missing the maximum, global sens and optimiser
If the response curve is typical of all your geometries and loadcases, does it help if you run the optimiser twice, with start angles 180° apart, and take the higher/lower value from the pair using...
View ArticleRe: Mechanica results variability
Oh, I didn't realise you got different results in design study vs regular analysis, I thought it was the discontinuity that was the issue. Need to read more carefully... Strange though, as you point...
View ArticleRe: Missing the maximum, global sens and optimiser
Hi Jonathan, Good idea, yes the response curve is typical. (96 of them) I didn't carry out 96 global studies, just 96 optimisations knowing that this is happening in the background. I was looking for...
View ArticleRe: Missing the maximum, global sens and optimiser
That is,,,, 96 more optimiser runs (96 x 2 in total) is better than 96 global graphs.
View ArticleRe: FEA...How to define roller bearing constraint in mechanica ?
Hi, For simplicity, how about a cylindrical constraint over a regioned length of each shaft? The constraint will be infinitely stiff, so if stiffness of the bearing about transverse directions matters...
View ArticleRe: Missing the maximum, global sens and optimiser
Creo Simulate's optimisers (GDP and SQP) are not suitable for discontinuous goal functions. I vaguely recall that the BMX-module (Behavioral Modeling Extension) has some other optimisation techniques....
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How to do "carve-out modeling" or "sub-modeling" with beams?
Hi everyone.We to solve a problem with large frame-type models. The idea is to claculate a whole frame using idealized beams first, obtain resultant forces in certain parts and apply equivalent forces...
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Re: How to do "carve-out modeling" or "sub-modeling" with beams?
Looks like I have found some propmpts here: http://www3.eng.cam.ac.uk/DesignOffice/cad/proewild3/usascii/proe/promec/resltstr/contents/reference/strat_bmresltnt.htm
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Re: Missing the maximum, global sens and optimiser
I have now played around a bit with the BMX. You can there do statistical design studies, i.e. "experiments" where you can make multi objective design studies. As I understand it, the default...
View ArticleRe: In Optimization Design, how to select one part's parameters in assembly...
Hello, have you been able to drive the part parameter by an assembly parameter and optimize for the assembly parameter instead?
View ArticleRe: HOW TO RUN AN OPTIMIZATION STUDY ON A PART OF AN ASSEMBLY?
So you do not want to optimize in the assembly, like in this thread: In Optimization Design, how to select one part's parameters in assembly situation?If I understand you correctly, you want to compute...
View ArticleRe: Deformed scaling factor remains in memory in the next non-scaled deformed...
Hello Tommaso, when you remove the checkmark, 10 % (= 0.1) becomes 10, so one should expect it to be much stronger deformed than before.But I always find it more surprising that 10% is scaling so much...
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