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NLOAD1 |
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NLOAD1 |
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»Click here to display Table of Contents«
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NLOAD1 |
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NLOAD1 |
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Bulk Data Entry
NLOAD1 – Time Dependent Load or Motion for Geometric Nonlinear Analysis
Description
Defines a time-dependent load or enforced motion for use in geometric nonlinear analysis.
f(t) = A * C * F(t/B)
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
NLOAD1 |
SID |
EXCITEID |
SENSID |
TYPE |
TID |
B |
C |
CID |
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TSTART |
TEND |
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Field |
Contents |
SID |
Load set identification number. (Integer > 0) |
EXCITEID |
SID number of DAREA, SPCD, GRAV or static load set data entry that defines A. See comments 2, 3 and 5. (Integer > 0) |
SENSID |
Sensor identification number. Load application is activated once the referenced sensor is activated. (Integer > 0) |
TYPE |
Defines the type of the dynamic excitation. See comments 2 and 3. Default = 0 (Integer, character or blank) |
TID |
TABLEDi entry identification number defining the load history F(t). (Integer > 0) TID=0 implies F(t) is a linear function passing through (TTERM-TTERMS, 0) and (TTERM, 1). TTERMS is the duration of each subcase. TTERM is the termination time. TID = 0 is only for geometric nonlinear implicit (quasi-)static analysis (NLGEOM). |
B |
Scale factor of the time in f(t). Default = 1.0 (Real > 0) |
C |
Scale factor for the function value in f(t). Default = 1.0 (Real) |
CID |
Coordinate system identification number defining a frame in which the imposed velocity is defined. Applies only for TYPE = 2, V, VE, VEL, or VELO. Only CORD1R and CORD2R systems are allowed. (Integer > 0 or blank) |
TSTART |
Start time. See comment 4. Default = 0.0 (Real > 0.0) |
TEND |
End time. Default = 1030 (Real > TSTART) |
| 1. | Time-dependent load sets must be selected with the Subcase Information command NLOAD = SID. It can only be selected in geometric nonlinear analysis subcases which are defined by an ANALYSIS = EXPDYN subcase entry. |
| 2. | The type of the dynamic excitation is specified by TYPE according to the following table: |
TYPE |
TYPE of Dynamic Excitation |
|---|---|
O, L, LO, LOA, or LOAD |
Applied load (force, moment, pressure, GRAV). (Default) |
1, D, DI, DIS, or DISP |
Enforced displacement using SPC/SPCD data. |
2, V, VE, VEL, or VELO |
Enforced velocity using SPC/SPCD data. |
3, A, AC, ACC, or ACCE |
Enforced acceleration using SPC/SPCD data. |
| 3. | The TYPE also determines the manner in which EXCITEID is used by the program as described below. |
| • | Excitation specified by TYPE is applied load. The EXCITEID may reference DAREA, or (and) static load set entries. If EXCITEID references both DAREA and static load set, the two loads will be super-imposed. |
| • | Excitation specified by TYPE is enforced motion. The EXCITEID must reference SPCD entries. |
| 4. | TSTART and TEND are only considered for enforced displacement, velocity, and acceleration. The continuation line is optional. |
| 5. | If a GRAV Bulk Data Entry is referenced in the EXCITEID field, the TYPE field should be set to LOAD. |
| 6. | This card is represented as a loadcollector in HyperMesh. |
See Also:
