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ptc-3652781-Visitor
1-Visitor
November 15, 2008
Question

style features

  • November 15, 2008
  • 1 reply
  • 2389 views
I am attempting to create a curvature continuous style curve that closely follows and references two arcs. Essentially, the new style curve will run through the arcs and provide a transition between them. I'm having trouble with the final result as it has unwanted inflections. Both arcs are convex and I essentially want a curvature continuous radius between them. Any suggestions?

    1 reply

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    RameetGrewal1-Visitor
    1-Visitor
    November 15, 2008
    David, The best way to eleimnate inflection would be to add more points or change the start and end locations of the curve(If the inflection is at the ends of the curve) Adding points should resolve the inflection point issue but would add complexity to the curve.So my advice would be to add the least number of points that resolve the inflection issue. You can also try and create a curvature continous curve by a datum curve through points and have curvature constraints.Then use tweak option to get the desired curve. Hope this helps, Rameet
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    DavidButz1-Visitor
    1-Visitor
    November 15, 2008
    David, Rameet is pointing you in the right direction. Let me make a couple more suggestions for doing this simply. 1. Create a Datum Point on the original 2-arc Curve using Ratio. Now pattern the Point. If you set the Ratio to 0.2, for example, set the number of instances to 4. Now create a new Datum Curve with a Spline through the end points of the original curve and the new patterned Datum Points. 2. If you want even better fit, create construction arcs continuing the original curve ends(equal radius at both ends), and make the Spline tangent to the construction arcs. 3. You can do something similar by laying arcs on top of the original arcs,terminating just short of the junction point, then creating a tangent 3-point Spline joining the arc end points, passing through the original junction point, and tangent to the new arcs. David
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    ptc-3652781-VisitorAuthor
    1-Visitor
    November 15, 2008
    Thank you all for the quick response. I thought I might be trying to over control the style curve with too many points so I've eliminated about as many as I can while still approximating the original controlling datum curves. However, I'm still struggling to avoid the inflections. I'd like to get some further clarification and some additional ideas for the following if I can...all related to the same issue. 1. I've heard about dynamic curvature plots. Does this mean it is possible to display the curvature of a style curve as I manipulate it so I can see the effect of moving the various points in real time? If so, how do I do it? 2. Is there a way to tell PROE that a curve should only have positive curve (i.e. only be convex as opposed to concave). It seems this might be a way to avoid the inflections. 3. Finally, is there a way in Style feature to relate a curve to controlling datum curves (i.e. arcs, lines, etc. created with standard PROE geometry) so the free points will update/move with the controlling geometry? Thank you all for your help!
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