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Re: Spline approximation of wire import

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07-23-2015 02:23 PM

Re: Spline approximation of wire import

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07-23-2015 02:31 PM

I'm still not clear. Your last attachment showed more than points.

Bruce Shand

SE2019 MP8 - Insight - Win10 - K4200

SE2019 MP8 - Insight - Win10 - K4200

Re: Spline approximation of wire import

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07-23-2015 02:37 PM - edited 07-23-2015 02:38 PM

Re: Spline approximation of wire import

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07-23-2015 08:57 PM

Don't remember if V20 allowed revolving connected segments without relationships. The sketch in the image does not seem to have relationships, though latest versions as far ST6 allow revolving a series of lines with connected endpoints having no relations.

~Tushar

Re: Spline approximation of wire import

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07-24-2015 05:53 AM

Is there anyway I can approximate this series of lines with a spline in V20 and revolve that?

Re: Spline approximation of wire import

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07-24-2015 06:39 AM - edited 07-24-2015 06:40 AM

Hi there Hendrik,

I don't know of any automated way, in Solid Edge [*I can do this in another program though*]....but I suspect in SE you'd need to create a new sketch and use the end points to create new geometry, being careful not to use too many of the control points. [*either by tangent lines & arcs, or a continuous spline curve*]

Also, feel free to upload your ".PAR" file for myself or one of the good people here, to offer more exacting help, based on how the geometry will respond and get to the result you need.

Sean CresswellDesign ManagerStreetscape LtdSolid Edge 2019 [MP8] Classic [x3 Seats - Cloud Enabled]Windows 10 - Quadro P2000

Re: Spline approximation of wire import

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07-24-2015 06:43 AM

If you actually have to get the curve to pass through all the points it may be possible using some other package to clean it up and then re-import the curve but this would be computationally expensive.

A third option might be to approximate the points using ST8. The tools to do this are much better than in V20. If you were able to share the point file I'm sure one of us could do the curve and export it in Parasolid or STEP format suitable for import to V20. You'd need to let us know roughly how accurate you need it to be.

Frank

Edinburgh University

Re: Spline approximation of wire import

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07-24-2015 06:45 AM

Edinburgh University

Re: Spline approximation of wire import

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07-24-2015 07:32 AM

Many thanks for your interest and effort!

Attached I have included the draft file, the part file, and the IGES export file containing just the points. The accuracy of these points is highly important, the measurements happened with a relative accuracy of 0,01 mm. Also the distance to the Z axis is of great importance. I apologize for asking such basic things, I am a PhD student in welding engineering with little experience in CAD software.

Re: Spline approximation of wire import

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07-26-2015 03:27 PM

Hendrik,

as is often the case, what seems like a simple question is actually quite complex. What method you use to fit a curve to this data is likely to be dependant on what you are going to use the curve for. Apologies if you already know all this but the question of accuracy is quite difficult to define and answer.

You could fit a curve through all 500+ points but it will be very slow to manipulate because the curve would be so comlex and time-consuming to compute. Given that there are already small errors in the point definitions if you forced a curve through all points it could actually be very innaccurate. The curve could be within the 0.01 band of the 'real' location of the points but between points you have no idea. The curve could end up wavy and thus a possibly poor representation of the actual 'real' shape.

If you were to use the resulting curve to calculate the surface area of the shape it might not be within a known tolerance. Similarly if you used it to be part of a CFD simulation the waviness could badly affect your results.

Most of the time CAD engineers want a smooth curve but it is difficult to mathematically explain how 'smoothness' is relevant to an analysis package (CFD, FE or whatever).

I hope all this makes sense but tomorrow if I get a chance I will do a few tests on my work machine to try out a few different curve fitting regimes.

Frank

Edinburgh University

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