SPLINE4
Bulk Data Entry Defines a curved surface spline for interpolating motion and forces for aeroelastic problems on aerodynamic geometries.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
SPLINE4 | EID | CAERO | AELIST | SETG | DZ | METH | USAGE |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
SPLINE4 | 56 | 33 | 12 | 11 | 0.0 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
EID | Unique spline identification number. (Integer > 0) |
|
CAERO | Identification number of the aerodynamic component that
defines the interpolation surface. (Integer > 0) |
|
AELIST | Identification number of an AELIST entry
listing the boxes to be interpolated using this
spline. (Integer > 0) |
|
SETG | Refers to the SET1 entry that lists the
structural grid points to which the spline is attached.
(Integer > 0) |
|
DZ | Linear attachment flexibility. 1. Default = 0.0 (Real ≥ 0.0) |
|
METH | Spline fit method.
|
|
USAGE | Spline usage flag. 2
|
Comments
- The attachment flexibility (units of area) is used for smoothing the interpolation. If DZ = 0.0, the spline will pass through all deflected grid points. If DZ is much greater than the spline area, a least squares plane fit will be applied. Intermediate values will provide smoothing.
- The USAGE field allows you to specify that the particular spline interpolant defined in this entry is to be used for both the force transformation and the displacement transformation. Currently, only the BOTH option is supported for the USAGE field.
- SPLINE4 cannot be used for slender bodies (CAERO2).