# Dynamic mass/spring/damper

#### matthew1982

1. Homework Statement
Hi I have attemted to work out the undamped natural frequency and the damping ratio can someone please confirm if this is correct? and for question d I have worked out r and TR can someone please confirm if this is correct? if all is correct I need help with plotting a graph for question d with the parameters set at the bottom of the question can you please help me anyone?

2. Homework Equations

3. The Attempt at a Solution

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#### matthew1982

Hi this is the correct file by the way the file on my first post is incorrect

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#### donpacino

Gold Member
In part D you are given the relationship between TR and r. You can use that equation to get the graph.

#### BvU

Seeing $$r = {\omega\over \omega_n} = r = {10\over 22.4} = 3.565$$ hurts my eyes (in more than one way). Can you explain this ?