WDTM
The WDTM function returns the magnitude of the difference between the angular acceleration vector of marker i in the reference frame of marker l and the angular acceleration of marker j in the reference frame of marker l.
Format
WDTM(i[,j][,l])
Arguments
i | The marker whose acceleration is being measured. |
j | The marker with respect to which the acceleration is being measured. Set j = 0, while still specifying l, if you want j default to the global coordinate system. |
l | The reference frame in which the first time derivative of the angular velocity vector is taken. Set l = 0 if you want the time derivatives to be taken in the ground coordinate system (GCS). |
Extended Definition
Mathematically, WDTM is calculated as follows:
where:
■
is the angular velocity vector of marker i in ground.
is the angular velocity vector of marker i in ground.■
is the angular velocity vector of marker j in ground.
is the angular velocity vector of marker j in ground.Examples
MARKER/1236, QP=4,6,7 EU=90D,90D,90D, PART=23
MARKER/2169, PART=16
REQUEST/16
,F1=WDTM(1236,2169)/
,F2=WDTX(1236,2169,2169,2169)/
,F3=WDTY(1236,2169,2169,2169)/
,F4=WDTZ(1236,2169,2169,2169)
MARKER/2169, PART=16
REQUEST/16
,F1=WDTM(1236,2169)/
,F2=WDTX(1236,2169,2169,2169)/
,F3=WDTY(1236,2169,2169,2169)/
,F4=WDTZ(1236,2169,2169,2169)
In its first column REQUEST/16 contains the magnitude of the angular acceleration vector of Marker 1236 with respect to Marker 2169, as seen in the global coordinate system and measured in the ground coordinate system (GCS).
See other Acceleration available.