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

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