20-sim webhelp > Library > Iconic Diagrams > Mechanical > Translation > 2DSmallRotation > Tips


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When you are working with the 2D-Library for small angles, it is good to keep the following tips in mind:

The 2DSmallRotations library is very well suited for frequency domain analysis through linearization.
The 2DSmallRotations library is not suited for large rotations. Consider a rotation of 0.05 degrees or 1 mrad as an upper bound for every model part.
It is not possible in 20-sim to use vector elements with mixed units. Therefore element number 3 will be displayed with units [m/s] and [N] although it really is [rad/s] and [Nm]!
The vector element number (1, 2 or 3) denotes the degree of freedom. Flipping or rotating of a model does not change this degree (e.g. a rotation does not change from x into y). Preferably leave the orientation of the models as they pop up on the screen.
To create intuitive models, the positive direction of each degree of freedom is defined as: x from left to right, y from bottom to top, ? counter clockwise.
To prevent misinterpretation of a model by other users, stick to the drawing rules that are given.
A TwoDBody model can be connected to any other element of the 2D-library except other 2D-bodies.
A TwoDBody model can be connected to 1D models using the TwoDPoint models as intermediate.
TwoDPoint models can only be connected to TwoDBody models.
If a TwoDBody model is connected to TwoDPoint models only, it has to be connected to at least three non-coinciding, unequal (i.e. not having the same offsets) TwoDPoints to prevent it from free motion.