# Vibration Isolation in Beams

## Main Question or Discussion Point

I wish to dampen a boom arm, which at its fixed point is connected to a vehicle (arm length is 5m long).
The boom is 'L shaped' is attached to the to of the vehicle and extends 5m in the horizontal, then the second leg hangs down 5m, almost to the ground. The end of the boom arms contains lead with an approximate mass of 1000kg. The boom itself is made from box section steel, dimensions are shown in the pdf.

The vehicle has a maximum acceleration, in this case, of 0.25m/s/s, I wish for the deflection at the end of the boom arm to be no more than +/-10mm.
Once a steady velocity of 0.4m/s is reached the deflection at the end of the boom arm needs to be no more than +/-5mm, within 3 seconds.

When modelling it by hand what do I need to take into account the rotation of the horizontal beam, due to torsion? What else?

I need to know I am correct with my evaluation of the displacement of the end of the boom firstly. Then I can model it on FEA to calculate what damper I need. Or can this be done by hand??

Kind regards

Henry

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