Hi,
I have 2 questions about the configuration of junction.
1. For junction illustrated above, point A, B ,C are the center points of the last cross sections of the reaches that joined in the junction , which point should I take as the origin of the local coordinate system? any one of them is OK? or there is a criterion when the orgin is choosen?
2. If A is considered the center of the cartesian coordinate system.then the angle α of the orthonormal external vectors of the cross sections are measured like that shows in Fig.2, is it right?