# A motor generator unit of mass 150 Kg runs at a constant speed of 1500 rpm. After installation the forcing frequency is found to be close to the natural frequency of the system. Design a dynamic absorber such that :- (A) the natural frequency of the main system is equal to that of the absorber and (b) the ratio of the operating frequency to the natural frequency is 0.9

Question-AnswerCategory: Design of MachineA motor generator unit of mass 150 Kg runs at a constant speed of 1500 rpm. After installation the forcing frequency is found to be close to the natural frequency of the system. Design a dynamic absorber such that :- (A) the natural frequency of the main system is equal to that of the absorber and (b) the ratio of the operating frequency to the natural frequency is 0.9

A motor generator unit of mass 150 Kg runs at a constant speed of 1500 rpm. After installation the forcing frequency is found to be close to the natural frequency of the system. Design a dynamic absorber such that :- (A) the natural frequency of the main system is equal to that of the absorber and (b) the ratio of the operating frequency to the natural frequency is 0.9

Given:

m=150 kg

Speed(N)=1500 rpm

ω=2πN/60

=2×3.14×1500/60