Adams Basic Package > Adams View > View Function Builder > Design-Time Functions > Functions: M - P > PSI

PSI

Returns the first angle associated with a body-fixed 313 rotation sequence from one coordinate system object to another. This first rotation is referred to as the psi, , angle, and is used in association with the theta, , (2nd rotation) and phi, , (3rd rotation) angles.
Positive angular displacement is determined by the right-hand rule.

Format

PSI (Object, Reference Frame)

Arguments

 
Object
Coordinate system object whose rotation is being measured.
Reference Frame
The coordinate system marker with respect to which the rotation is being measured.

Example

The following example illustrates the use of the PSI function:
PSI(marker_O, marker_R)
The following illustrations show the rotation sequence for PSI, THETA, and PHI:
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