Vibration analysis

I have a fan system that continues to fail due to vibration levels. Can anyone recommend some good literature on vibration monitoring and elimination of harmonic frequencies on structure?

Thanks.

Hi, here you have two related books.

[url]http://www.4shared.com/office/8mYCvCYn/Vibration_Basics.html[/url]

[url]http://www.4shared.com/office/Q6UIO7Jc/Mechanical_Vibration_by_S_S_Ra.html[/url]

Edo

Hi Edo,

Thanks very much for the reply, but the links are no longer valid.