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NX Aero Design Features - Flange and Rib

Siemens Valued Contributor Siemens Valued Contributor
Siemens Valued Contributor

An industry discipline will benefit from software capabilities tailored to address a practice or task unique to the discipline. An airframe part has unique characteristics that can certainly be modeled with traditional, atomic modeling techniques, but features designed for these characteristics will accelerate modeling tasks.

Enter NX Aero Design features, introduced in NX 10. In case you missed it this is the first in a series of articles to highlight details of the aero design features. In this installment, Aero Flange and Aero Rib.


Aero Flange 

Aero Flange derives a thin-wall a body from a skin and a guide.
Flange 1.jpg
The flange body extends from the intersection of the guide face along the skin. You can also select a datum plane or a curve as the guide object.

Dimensions control the size of the flange – width, length, thickness. In the example below, width is symmetric and length extends along the skin beyond the guide.
Flange 2 Length.jpg
There is a dimension to offset the width of the flange from the guide along the skin. And a dimension to offset thickness normal to the skin.
Flange 3 Width Offset.jpg
You also have an option for symmetric thickness.

The example below illustrates another option to select a face to define length.
Flange 4 Length to Selected.jpg
And a dimension to set the length offset from the length face.
Flange 5 Length Offset.jpg
Depending on how many options you take advantage of, Aero Flange can replace four or five atomic features in a simple case, or a dozen or so in an involved case.


Aero Rib

Aero Rib is similar to Aero Flange; the difference is the direction of the body. Where a flange extends along the skin - coincident or offset – a rib is normal to the skin.
Rib 1.jpg
Dimensions control the size of the rib:  

  • Height
  • Length
  • Thickness
  • Offset from the guide along the skin
  • Offset height normal to the skin


Options are provided for symmetric height and symmetric thickness.

The example below illustrates sketch curves used as the guide. The sketch curves are projected onto the skin and the rib body is derived from the projected guide curve.Rib 2 from Sketch.jpg


Continuing this example, the length of the rib is modified at both ends. Length 2 is negative along the guide; Length 1 is positive extending along the skin beyond the end of the guide.

Rib 3 Length.jpg
Look for similar articles on NX aero design features in the near future.