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Section 1
1-5
directions. The translational degrees of freedom are denoted by
u
1
, u
2
, u
3
and the rotational degrees of freedom are denoted by u
4
,
u
5
& u
6
.
B. Cylindrical Coordinate System: In this coordinate system, (Fig.
1.3) the X and Y coordinates of the conventional cartesian system
are replaced by R (radius) and Ø (angle in degrees). The Z
coordinate is identical to the Z coordinate of the cartesian system
and its positive direction is determined by the right hand rule.
C. Reverse Cylindrical Coordinate System: This is a cylindrical type
coordinate system (Fig. 1.4) where the R- Ø plane corresponds to
the X-Z plane of the cartesian system. The right hand rule is
followed to determine the positive direction of the Y axis.
Figure 1.2 : Cartesian (Rectangular) Coordinate System