Come si possono esprimere i valori misurati ai vincoli di forza e coppia rispetto ad un riferimento globale?
WM3D expresses constraint forces and torques in the local coordinates of the Base Coord. To express measured constraint forces in the World coordinate system, the following formulas must be used in a customized meter:
where:
fx/W , fy/W , fz/W represents the X, Y, Z components of the constraint force expressed in World coordinates.
fx/L , fy/L , fz/L represents the X, Y, Z components of the constraint force expressed in local coordinates of the Base Coord. This is how measured constraint forces are represented in WM3D.
CRx , CRy , CRz represents cos(Rx), cos(Ry), cos(Rz)
SRx , SRy , SRz represents sin(Rx), sin(Ry), sin(Rz)
where Rx, Ry, Rz define the Base Coord orientation.
Download Constraint Forces Expressed in World Coordinates.WM3 from the WM3D v3.0 Model Library for an example of a customized meter containing the above formulas.
Similarly, to express measured constraint torques in the World coordinate system, use the following formulas:
where:
Tx/W , Ty/W , Tz/W represents the X, Y, Z components of the constraint torque expressed in World coordinates.
Tx/L , Ty/L , Tz/L represents the X, Y, Z components of the constraint torque expressed in local coordinates of the Base Coord. This is how measured constraint torques are represented in WM3D.
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visualNastran 3D Motion, FEA Inside, 4D, SimWiseData ultimo aggiornamento: 2 settembre 2011
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