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:
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#
Dimension#
Parameter |
Unit |
Description |
|---|---|---|
Screw pitch |
m |
Pitch of the ball screw |
Stiffness#
Parameter |
Unit |
Description |
|---|---|---|
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 |
Viscous damping#
Parameter |
Unit |
Description |
|---|---|---|
Axial damping |
Ns/m |
Axial viscous damping of the nut-to-screw coupling |
Radial damping |
Ns/m |
Radial viscous damping of the nut-to-screw coupling |
Tilting damping |
Nms/rad |
Tilting viscous damping of the nut-to-screw coupling |
Rotational damping |
Nms/rad |
Rotational viscous damping when rotating the screw relative to the nut |
Hysteretic damping#
Parameter |
Unit |
Description |
|---|---|---|
Axial damping |
None |
Axial hysteretic damping of the nut-to-screw coupling |
Radial damping |
None |
Radial hysteretic damping of the nut-to-screw coupling |
Tilting damping |
None |
Tilting hysteretic dampign of the nut-to-screw coupling |