Translational Force Vector (FXYZ)
The FXYZ measure returns the net translational force vector acting on marker i, represented in the coordinate system of marker k. All force and constraint elements acting between markers i and j are included in the calculation of the force. If j is not specified, FXYZ measures the sum of all force and constraint elements acting on marker i. If k is not specified or if k=0, the force is represented in the GROUND coordinate system. To specify k without specifying j, use j=0.
Format
FXYZ(i[,j][,k])
Arguments
Applied To Marker (i) | An integer that specifies the identifier of the marker at which the magnitude of the net force is to be calculated. |
Applied From Marker (j) | A second integer that specifies a marker identifier. All forces acting between the [i,j] pair are to be included in the calculation. Set j = 0 or do not specify if you are interested in all forces acting on marker i. |
Along Marker (k) | An integer that specifies the identifier of a marker (coordinate system) in which the x-component of the force is to be returned. k defaults to the global coordinate system when it is not specified. |
Extended Definition
Mathematically, FXYZ is calculated as:
where:
■FX is the Sum of Forces Along X (FX) measure.
■FY is the Sum of Forces Along Y (FY) measure.
■FZ is the Sum of Forces Along Z (FZ) measure.
Examples
Magnitude of torque at marker 5 due to all forces applied at marker 4.
VARIABLE/1, FUN=MAG(DXYZ(4,5)%FXYZ(4))