Hi I had a quick question. From what I understand resonance is when a natural frequency of an object is matched by the driver frequency however in this graph it seems as though resonance is occurring at all the frequencies around the natural frequency just not to a great extent. http://perlgeek.de/talks/2010/yapceu-p6-realworld/resonance.png So according to this graph damping reduces the maximum effect that can take place, i.e. the maximum amplitude possible at THE natural frequency, however increases the number of frequencies at which 'partial' resonance can occur. This doesn't make sense to me as I thought that resonance can only occur at ONE frequency, the natural frequency. This ties into why I don't understand when people refer to 'resonant frequencies' I thought there can only be one. Sorry if I'm unclear and if you don't understand anything I wrote please let me know and I'll try to clarify.