Freeform Structures Using NURBS

NURBS structure and FE mesh
NURBS structure and FE mesh

Freeform structures can be defined based on NURBS curves, areas and solid objects (Non-Uniform Rational Basic Spline). This makes it easy to create structures that do not conform with any particular shape defined by ruled geometry. Also, element meshes can be instantly generated on the NURBS.

NURBS area structure and FE mesh
NURBS area structure and FE mesh
NURBS solids
NURBS solids

Numerous functions make the handling of highly complex structures simple. For example, you can generate any rotational surface or extrude solids.

NURBS curve with control points
NURBS curve with control points
Moving a control point
Moving a control point

A NURBS curve is described by a control polygon. The level of the NURBS indicates how closely it approaches the polygon. By simply moving the control points, the NURBS can be transformed into practically any shape.

In the following example a FEM mesh is generated with the help of a NURBS surface.

The NURBS curves are used for generation
The NURBS curves are used for generation

The NURBS curves are used here to generate the NURBS surface.
These are entered directly through the definition of control or interpolation points.

of the NURBS surface
of the NURBS surface

The selected curves describe the NURBS surface, which can be manipulated further using the control points.

FE mesh of NURBS surface
FE mesh of NURBS surface

A mesh is directly generated for the NURBS surface, allowing even complicated structures to be created with ease.