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ACCEL2 |
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ACCEL2 |
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ACCEL2 |
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ACCEL2 |
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ACCEL2– Acceleration Load at a Specific SET of GRID Points
The ACCEL2 Bulk Data Entry can be used to define static acceleration loads at a specific SET of GRID points in the model.
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ACCEL2 |
SID |
SSID |
CID |
A |
N1 |
N2 |
N3 |
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DIR |
TID |
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Field |
Contents |
SID |
Acceleration load set identification number. (Integer > 0) |
SSID |
SET identification number of a SET of Grid points at which the acceleration load is applied. (Integer > 0) |
CID |
Coordinate system identification number. = 0: references the basic coordinate system Default = 0 (Integer > 0, or blank) |
A |
Scale factor for the acceleration load vector (Real) |
N1,N2,N3 |
Acceleration load vector components in the coordinate system CID. (Real, a minimum of one Ni should not be set to 0.0) |
DIR |
Component direction of the acceleration load variation (Character; one of X, Y, or Z) |
TID |
Identification number of a TABLED1 entry that specifies the Location (LOCi) vs Scale Factor (VALi) values (similar to the ACCEL entry). |
| 1. | The acceleration load applied to all grid points in the referenced SSID SET in the model is given by: |
Where, a is the acceleration load and N is a vector with components N1, N2, and N3.
The scale factor VAL for each grid in the specified SET SSID in the model is automatically determined 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.
Figure 1: Acceleration Load Factor (VAL) vs Location along DIR (LOC)
| 2. | The acceleration loads specified in the ACCEL2 entry can be combined with other loads, such as FORCE, MOMENT, GRAV, ACCEL, and ACCEL1, through the LOAD Subcase Information Entry. The SID on the ACCEL entry should be unique with regard to any other load entry. |
| 3. | The acceleration load does not include effects, due to mass on SPOINTs. |
| 4. | The ACCEL2 entry is similar to the ACCEL entry. The ACCEL load is applied to the entire model while the ACCEL2 load is calculated similar to ACCEL but applied only to the specified SET of grid points (SSID). Additionally, an extra scale factor A is applied to the acceleration load vector. |
| 5. | This card is represented as a force load in HyperMesh. |
