We have put together the following page of Links to assist you in
understanding the noise and vibration problem, and just because some
of this information is pretty darn cool.
Related Links & Interesting Stuff
Use of foam in the Auto Industry to Dampen Sound
http://www.americanchemistry.com/s_plastics/doc.asp?CID=1080&DID=6590
Tacoma Narrows Bridge AKA Galloping Gertie
http://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge
http://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_Collapse
Technical Links
Resonance
http://en.wikipedia.org/wiki/Resonance
Great Physics Tutorial on Natural Frequency
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/sound/u11l4a.html
Natural Frequency Explained
http://www.azimainc.com/vibman/naturalfrequencies.htm
Vibration defined and explained as only Wiki can
http://en.wikipedia.org/wiki/Vibration
Great Definition for Phase of Vibration
http://www.thefreedictionary.com/Phase+of+vibration
Excellent Illustration of Vibratory Phase in Mechanical Equipment
http://www.update-intl.com/VibrationBook1c.htm
Another really good Physics Tutorial on Vibratory Harmonics
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l4d.html
Great Site for Harmonics as well as Standing Waves & other Sound
Info
http://www.miqel.com/jazz_music_heart/vibrational-truth.html