(Solved): Question 3 [10 marks] A large machine has a mass of 200kg and is mounted on an undamped elastic foun ...

Question 3 [10 marks] A large machine has a mass of

and is mounted on an undamped elastic foundation of stiffness keq as shown. During operation at

, the machine is subject to a harmonic force of magnitude

; a) Determine the required stiffness

of an undamped vibration absorber of mass

such that steady-state vibrations of the machine are eliminated during operation. b) When this absorber is used, what is the frequency range such that the machine's steady state amplitude is less than

?