Rotation Angles (Rotational Motions)
Rotation Angles (Rotational Motions) :
The rotational displacements indicated θX, θY, and θZ in Figure 1 of Evans et al. (2010). Terms like “X-rotation” may be used as shorthand though “rotation angle θX” is more formal. Authors are cautioned that the term “rotational displacement” has other meanings and should be defined (e.g., P. Spudich, written comm., 2008; B. R. Julian, oral comm., 2008). Rotation angles are generally given in units of radians. For example, “θX” is the right-handed rotation angle about the X axis. The SI abbreviation for “radians” is “rad,” and for “seconds” it is “s” (not “sec”); thus, units in the style “mrad/s” are preferred to “milli-radians/sec”. In continuum mechanics, rotation angle and axis of rotation define the rotation tensor
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