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