SIX DEGREES OF FREEDOM(6DOF)
The
six degrees of freedom: forward/back, up/down, left/right, yaw, pitch, roll
6DoF refers to
the freedom of movement of a rigid body in three-dimensional space. Specifically, the body is
free to change position as forward/backward,
up/down , left/right translation in three perpendicular axes combined with changes in orientation through rotation about three perpendicular axes, often termed yaw , pitch,
and roll.
Six
degree of freedom consists of the following movement:
- Translation – Moving along the
different axes X, Y and Z
- Moving up and down along the Y
axis is called heaving.
- Moving forwards and backwards
along the X axis is called surging.
- Moving left and right along
the Z axis is called swaying.
- Rotation – Turning in order to
face a different axis
- Moving between X and Y is
called pitch.
- Moving between X and Z is
called yaw.
- Moving between Z and Y is called roll.
A example of an object that has 6DOF is an
airplane. It can move freely in three-dimensional space, with the two
horizontal axes as X and Z while the vertical axis is Y. If it needs to face up
or down, it needs to change the orientation of its nose from horizontal X to Y
which is called pitch. If the plane needs to turn from the X axis to the Z axis
without changing the orientation of its body, it can do a yaw by using its
rudder so the wings remain horizontal while the nose starts to point to the Z
axis. Since it is often assumed that the X orientation is always where the nose
is facing with regards to the plane, moving the plane from X to Y will make it
roll, hence the term. The pilot can then combine any of these parameters of
movement to execute maneuvers.
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