ACCEL
Bulk Data Entry Defines acceleration loads to all grids in the model. These loads can either be constant or vary in a particular direction over sections of the model.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
ACCEL | SID | CID | N1 | N2 | N3 | DIR | |||
LOC1 | VAL1 | LOC2 | VAL2 | etc. |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
ACCEL | 12 | 0 | 1.0 | 2.0 | .10 | Y | |||
0.0 | 4.0 | 200.0 | 5.0 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
SID | Acceleration load set
identification number. (Integer > 0) |
|
CID | Coordinate system
identification number.
(Integer ≥ 0, or blank) |
|
N1,N2,N3 | Acceleration load vector
components in the coordinate system
CID. Default = blank (Real, if non-zero loading is required, then a minimum of one Ni should be non-zero) |
|
DIR | Component direction of the
acceleration load variation. Default = blank (Character; one of X, Y, or Z) |
|
LOCi | Location of the scale
factor to the applied acceleration load along direction
DIR in the coordinate system
CID. Default = blank (Real) |
|
VALi | Load scale factor at the
location LOCi. Default = blank (Real) |
Comments
- The acceleration load applied to all grid points
in the model is given by:
- Acceleration load.
- Vector with components N1, N2, and N3.
- Directional scale factor.
It is not mandatory to define the directional scale factor. No scale factor is defined if you do not define DIR, VALi, and LOCi. In such cases, only N1, N2, and N3 can be defined to apply a constant acceleration load throughout the model.
If DIR, VALi, and LOCi are defined, then the scale factor VAL for each grid in the model is automatically by linear interpolation between VALi for the DIR component of the corresponding LOCi between which the required grid point lies. If the GRID point's DIR coordinate in the coordinate system CID is outside the range specified by LOCi, the corresponding VAL is determined either from VAL1 or VALn (Figure 1). A minimum of two pairs of (LOCi and VALi) should be specified, if such directional scaling is required. - The acceleration loads specified in the ACCEL entry can be combined with other loads, such as FORCE, MOMENT, GRAV, ACCEL1, and ACCEL2, through the LOAD Subcase Information Entry. The SID on the ACCEL entry should be unique with regard to any other load entry.
- The acceleration load does not include effects, due to mass on SPOINTs.
- This card is represented as a force load in HyperMesh.