Block Format Keyword
/IMPVEL - Imposed Velocities
Description
Defines imposed velocities on a group of nodes.
Format
(1)
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(2)
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(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(10)
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/IMPVEL/impvel_ID/unit_ID
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impvel_title
|
fct_IDT
|
Dir
|
skew_ID
|
sens_ID
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grnd_ID
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frame_ID
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icoor
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|
|
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Ascalex
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FscaleY
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Tstart
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Tstop
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|
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Field
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Contents
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SI Unit Example
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impvel_ID
|
Imposed velocity block identifier
(Integer, maximum 10 digits)
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unit_ID
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Optional unit identifier
(Integer, maximum 10 digits)
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impvel_title
|
Imposed velocity block title
(Character, maximum 100 characters)
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fct_IDT
|
Time function identifier
(Integer)
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Dir
|
Direction: X, Y, and Z in translation; XX, YY, and ZZ in rotation
(Text)
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skew_ID
|
Skew identifier
≠ 0: the imposed velocity is computed in the global frame and projected onto the local skew.
(Integer)
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sens_ID
|
Sensor identifier
≠ 0 (sensor activated): the imposed velocity is applied after sensor activation. The time function is shifted by the sensor activation time.
(Integer)
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grnd_ID
|
Node group on which the imposed velocity is applied
(Integer)
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frame_ID
|
Frame identifier
≠ 0: the imposed velocity is computed and applied in the local frame.
(Integer)
|
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icoor
|
Coordinate system usage type
(Integer)
= 0: Cartesian coordinates
= 1: Cylindrical coordinates
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Ascalex
|
Abscissa (time) scale factor for fct_IDT
Default = 1.0 (Real)
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FscaleY
|
Ordinate (velocity) scale factor for fct_IDT
Default = 1.0 (Real)
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Tstart
|
Start time
(Real)
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Tstop
|
Stop time
Default = 1030 (Real)
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| 1. | The velocity direction must be right justified in the ten characters of field number 2. |
| 2. | If a velocity is imposed in a frame (frame_ID ≠ 0), the frame nodes must not have an imposed velocity themselves. |
| 3. | If Tstart and Tstop are specified, the velocity is imposed between these times. However, in this case, the time vs. velocity function is not shifted to begin at Tstart. |
| 4. | The AscaleX and FscaleY are used to scale the abscissa (time) and ordinate (velocity). |
The actual load function value is calculated as following:
| 5. | SKEW and FRAME cannot be defined together. This is SKEW or FRAME. |
| 6. | If icoor=1, the directions X, Y, and Z (resp. XX, YY, and ZZ) refer to translations along (resp. rotations around) the radial direction (r), azimuthal angular direction ( ) and longitudinal direction (Z) (refer to /SKEW and /FRAME). |
| 7. | If icoor=1 when imposing the translational velocity in the radial, resp. the azimuthal direction, the velocity of the node is set so that: |
with 
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See Also:
Implicit Features and Compatibility Information
Skew and Frame (/SKEW & /FRAME)
Example 2 - Snap-through Roof
Example 6 - Fuel Tank
Example 8 - Hopkinson Bar
Example 10 - Bending
Example 11 - Tensile Test
Example 15 - Gears
Example 17 - Box Beam
Example 24 - Laminating
Example 25 - Spring-back
Example 26 - Ruptured Plate
