This video is a lecture by Professor Dame Ann Dowling, President of the Royal Academy of Engineering. The whole thing is interesting, I think, but there is a bit at 12m51s about her work on the RB199 to reduce vibration caused by combustion instability. I just thought you might enjoy it.
Here is a direct link to the bit about the RB199:
https://www.youtube.com/watch?v=lOufUmJDSFg&t=12m51s