!!!!This code does NOT work as intended. Yet.!!!!
It supposed to be an implementation of the Segalman method [1], using modal analysis information obtained using Nastran.
Please note that this is not the last revision of the method, the latest work is [2].
[1] http://www.osti.gov/scitech/biblio/573295
[2] http://prod.sandia.gov/techlib/access-control.cgi/2013/133429.pdf