Critically damped cantilever beam

AI Thread Summary
The discussion focuses on designing a multi-layer cantilever beam with alternating visco-elastic and elastic layers to damp vibrations from a firm support vibrating in the audio range. The beam is intended to be 18 inches unsupported and 4 inches glued to the support. Participants inquire about finite element method (FEM) software suitable for vibration analysis involving materials with complex elastic moduli. There is a request for clearer problem descriptions and sketches to aid understanding. The goal is to effectively dampen vibrations and prevent them from reaching the beam's far end.
BeamStudent
I need to design a multi-layer cantilever beam with alternate visco-elastic and elastic layers. The goal is a beam with 18" unsupported and 4" glued to a firm support. In operation, this firm support will be vibrating in the audio range and the beam wants to damp out those vibrations and not pass them to the far end.

What FEM software deals with vibration analysis with material having elastic moduli expressed as complex numbers?

Has anybody done this sort of analysis and design?
 
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I can't make much sense of that problem description

Please start again and clearly describe what it is that you are trying to achieve .
 
A sketch would be very helpful
 

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