================ Ball screw drive ================ Ball screw drive link properties implement a ball screw drive. Only the linear elastic behaviour is modelled, non-linearities are neglected. The simplifications are: - any kind of backlash is neglected - local deformation of the nut is not modelled ---------- Definition ---------- Source and target interfaces should be chosen as shown in following figure: .. image:: media/lp_screw.png :alt: Ball screw drive link definition :scale: 100 % ^^^^^^^^^^^^^^^^^^^^ Source interface ^^^^^^^^^^^^^^^^^^^^ ============== =========================================================================================== Type Moving interface (Fourier) Topologies Peripheral face of the screw Location Along the screw axis u direction Axial, along the screw axis v direction Radial w direction Radial ============== =========================================================================================== ^^^^^^^^^^^^^^^^^^^^ Target interface ^^^^^^^^^^^^^^^^^^^^ ============== =========================================================================================== Type Stationary interface (6dof) Topologies Mounting face of the nut Location Center of the screw axis u direction Axial, along the screw axis v direction Radial w direction Radial ============== =========================================================================================== ^^^^^^^^^^^^^^^^^^^^^^^^^ Recommended link settings ^^^^^^^^^^^^^^^^^^^^^^^^^ ========================== ========================== Use ground for source unchecked Location master target Orientation master either source or target ========================== ========================== ---------- Parameters ---------- =================== ========= ======================================================================= Parameter Unit Description =================== ========= ======================================================================= Screw pitch m Pitch of the ball screw Axial stiffness N/m Axial stiffness of the nut-to-screw coupling Radial stiffness N/m Radial stiffness of the nut-to-screw coupling Tilting stiffness Nm/rad Tilting stiffness of the nut-to-screw coupling Axial damping Ns/m Axial damping of the nut-to-screw coupling Radial damping Ns/m Radial damping of the nut-to-screw coupling Tilting damping Nms/rad Tilting damping of the nut-to-screw coupling Rotational damping Nms/rad Rotational damping when rotating the screw relative to the nut =================== ========= =======================================================================