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1. The problem statement, all variables and given/known data

Hi,

I have a problem with first question from site below:

http://engineeronadisk.com/V2/notes_courses/engineeronadisk-91.html#pgfId-521824

3. The attempt at a solution

I was trying to solve it using transmissibility equation but there is no mass so I cant find a natural frequency.

Transmissibility is in this case 0.01% because the isolation required is 99.9%.

T= sqrt {[1+4*d^2*(f/f0)^2]/[(1-(f/f0)^2)^2 + 4*d^2*(f/f0)^2]}

d- damper value

f- frequency which is 100Hz

f0- natural frequency

The other way is to use dynamic equation and then find transfer function:

dynamic equation: cx' + kx = M x''

but the Mass is unknown and it's the problem.

Please help

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# Homework Help: Spring, Mass , Dumper system. Dumper Value.

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