Critically damped cantilever beam

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SUMMARY

The discussion focuses on designing a multi-layer cantilever beam with alternating visco-elastic and elastic layers, specifically measuring 18 inches unsupported and 4 inches glued to a firm support. The primary objective is to dampen vibrations in the audio range generated by the support, preventing them from reaching the beam's far end. Participants are seeking recommendations for Finite Element Method (FEM) software capable of performing vibration analysis with materials characterized by complex elastic moduli. Clarity in the design requirements and visual aids, such as sketches, are emphasized for effective communication.

PREREQUISITES
  • Understanding of cantilever beam mechanics
  • Familiarity with visco-elastic and elastic material properties
  • Knowledge of vibration analysis techniques
  • Experience with FEM software for structural analysis
NEXT STEPS
  • Research FEM software options for vibration analysis, such as ANSYS or COMSOL Multiphysics
  • Learn about complex elastic moduli and their application in material science
  • Explore design principles for multi-layer beam structures
  • Study techniques for visualizing and sketching engineering designs effectively
USEFUL FOR

Mechanical engineers, structural analysts, and materials scientists involved in vibration control and cantilever beam design will benefit from this discussion.

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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