Flutter derivatives project

[MW]

Hi I'm in my Final Year of Aero Eng, and I've been given my final year project. What I will be doing is studying flutter derivatives of a two deck bridge, and then predicting what happens when adding parts such as railings etc... Since I have never studied flutter before, can someone explain what flutter derivatives are? I know of flutter, but need to know what flutter derivatives mean.
Thanks very much [sig][/sig]

 

[Qshake]

To be fair, here is a reference: Cable Stayed Bridges:An approach to modern bridge design by M.S. Troitsky. Check it out and pay particular attention to the chapter on aerodynamic stability and the many references at the end.

Good Luck on the project. [sig][/sig]