# SPLINE1

Bulk Data Entry Defines a surface spline for interpolating motion and forces for aeroelastic problems on aerodynamic geometries defined by regular arrays of aerodynamic points.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
SPLINE1 EID CAERO BOX1 BOX2 SETG DZ METH USAGE

## Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
SPLINE1 56 33 12 13 11 0.0

## Definitions

Field Contents SI Unit Example
EID Unique spline identification number.

(Integer > 0)

CAERO Aero-element (CAEROi entry ID) that defines the plane of the spline.

(Integer > 0)

BOX1, BOX2 First and last box with motions that are interpolated using this spline. 1

(Integer > 0; BOX2 > BOX1)

SETG Refers to the SETi entry that lists the structural grid points to which the spline is attached.

(Integer > 0)

DZ Linear attachment flexibility.

Default = 0.0 (Real ≥ 0.0)

METH Spline fit method.
IPS (Default)
Harder-Desmarais Infinite Plate Spline.
TPS
Thin Plate Spline.

USAGE Spline usage flag. 3
BOTH (Default)
For both force and displacement transformations.

1. The interpolated points (k-set) will be defined by aero boxes. Figure 1 shows the cells for which ${u}_{k}$ is interpolated, if BOX1 = 326 and BOX2 = 333.