LOCAL_SYSTEM: Defining Airbag Local Axes

LOCAL_SYSTEM: Defining Airbag Local Axes

In general it is easiest to fold a bag if it is oriented initially in the global X-Y plane. However, if it is already in a vehicle this is unlikely to be the case. The user can therefore move the bag to a more convenient folding position.

This is done by pressing LOCAL_SYSTEM which will invoke the menu shown on the right. The user should then define the local X-Y plane (referred to as the origami local system) by selecting three nodes:

N1 defines the local axis origin;

N2 defines the local x-axis;

N3 defines another point in the X-Y plane.

Alternatively you can type in the local axis vectors, which PRIMER will normalise for you.

If this option is invoked when the current fold number is non-zero (see Section 6.1.8) the user can define a local axis system that affects the current fold only (referred to as the fold local system). Otherwise it applies to the Origami definition as a whole.