Motion Modifier Option¶

Overview¶

The rotation axis can be made to move with time via four motion modifiers. These motions are superimposed on the rotation. The motion modifier can also be disabled.

Disabled: No motion modifier.

Azimuthal Orbit

Produces a motion like the spinning earth orbiting about the sun. The path of the azimuthal orbit is centered about a user-defined point with an orbit axis parallel to the rotation axis. For reference, a vector will appear illustrating the mount point and orbit vector.

Orbit Speed: rpm | Orbit angular speed for use with the azimuthal orbit motion modifier. The parameter defines the frequency of any orbital motion.
Orbit Motion Point: m | Orbiting motion mount point for use with the azimuthal orbit motion modifier. The orbit axis is assumed to be parallel to the axis of rotation axis (as defined by the motion axis), with a location defined by this reference point.

Axial Reciprocate

Produces a motion like a spinning drill pulsing in and out of a bore hole. Axial motion is centered about the motion axis root in the direction of the axis unit vector.

The position of the object, relative to the axis root, is defined by the cosine expression:

\[a(t) = A \cos \left( \frac{2\pi}{60} f t +\phi \right)\]

a(t): Axial position, meters
A: Amplitude, meters
f: Frequency, cycles per minute
\(\phi\): Initial displacement, radians

Axial Reciprocate Amplitude: m | Amplitude of any axially reciprocating motion in model units.
Axial Reciprocate Frequency: cycles/min | The parameter defines the frequency of any axially reciprocating motion.
Axial Reciprocate Initial Angle: rad | The initial angular displacement. This defines the initial position of the object with the stroke.

Radial Oscillate

Produces a motion like a spinning rotor bit cutting a slot. The motion is perpendicular to the axis of rotation in the direction set by the user.

This is defined by the cosine expression:

\[a(t) = A \cos \left( \frac{2\pi}{60} f t +\phi \right)\]

a(t): Axial position, meters
A: Amplitude, meters
f: Frequency, revolutions per minute
\(\phi\): Initial displacement, radians

Radial Oscillation Amplitude

m | Amplitude of any radial oscillation motion in model units.

Radial Oscillation Frequency

rpm | The parameter defines the frequency of any radial oscillations.

Radial Oscillation Direction

Direction in which to impose the radial oscillation.

X: Specifies the oscillation direction along constant X.
Y: Specifies the oscillation direction along constant Y.
Z: Specifies the oscillation direction along constant Z.

Axial Translate

Produces a constant linear translation along the axis of rotation with a speed set by the user.

Axial Translate: m/s | Axial translation speed. Component moves along the axis of rotation at this speed.