Block Format Keyword

/IMPACC - Imposed Accelerations

Description

Defines imposed accelerations on a group of nodes.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/IMPACC/impacc_ID/unit_ID
impacc_title
fct_IDT	Dir	skew_ID	sens_ID	grnd_ID
Ascalex		FscaleY		Tstart		Tstop

Field	Contents	SI Unit Example
impacc_ID	Imposed acceleration block identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
impacc_title	Imposed acceleration block title (Character, maximum 100 characters)
fct_IDT	Time function identifier (Integer)
Dir	Direction: X, Y, and Z in translation; XX, YY, and ZZ in rotation (Text)
skew_ID	Skew identifier (Integer)
sens_ID	Sensor identifier ≠ 0 (sensor activated): the imposed acceleration is applied at the time of sensor activation and the time vs. acceleration function are shifted in time. (Integer)
grnd_ID	Node group on which the imposed acceleration is applied (Integer)
Ascalex	Abscissa (time) scale factor for fct_IDT Default = 1.0 (Real)
FscaleY	Ordinate (acceleration) scale factor for fct_IDT Default = 1.0 (Real)
Tstart	Start time (Real)
Tstop	Stop time Default = 1030 (Real)

1.	The acceleration direction must be right justified in the ten characters of field number 2.

2.	If Tstart and Tstop are specified, then acceleration is imposed between these times. However, in this case the time vs. acceleration function is not shifted by the sensor activation time.

3.	The AscaleX and FscaleY are used to scale the abscissa (time) and ordinate (acceleration).

The actual load function value is calculated as follows:

Unlike /GRAV, this keyword is a kinematic condition which is applied to a set of nodes. The node will always be moving with the specified acceleration.

/IMPACC

/IMPACC

/IMPACC

Block Format Keyword

/IMPACC - Imposed Accelerations

Format

/IMPACC/impacc_ID/unit_ID

impacc_title

See Also: