The TX measure returns the x-component of the net translational torque 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 torque. If j is not specified, TX measures the sum of all force and constraint elements acting on marker i. If k not specified or if k=0 the torque is represented in the GROUND coordinate system. To specify k without specifying j use j=0.
Format
TX(i[,j][,k])
Arguments
i | An integer that specifies the identifier of the marker at which the magnitude of the net torque is to be calculated. Objects using marker i (for example, SFORCE, JOINT) must be active. |
j | A second integer that specifies a marker identifier. All torques 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 torques acting on marker i, for example, TX(i,0,k) will compute the sum of all torques acting on marker i. |
k | An integer that specifies the identifier of a marker (coordinate system) in which the x-component of the torque is to be returned. k defaults to the global coordinate system when it is not specified. |
Examples
JOINT/1, REVOLUTE, I=32, J=44
MOTION/1, ROTATION, JOINT=1, FUNCTION=10*TIME
VARIABLE/31, FUNCTION=TX(32,44)
In this example a revolute joint and motion (through the joint) act between Marker 32 and 44. A new state variable VARIABLE/31 is defined to have the x-component of the sum of all torques acting between markers 32 and 44 as computed in the global coordinate system. Since JOINT 1 and motion 1 are defined between markers 32 and 44, their reaction torque will be included in the computation of TX().