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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-Answer › Category: Mechanical Engineering › 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
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ali asked 9 months ago

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

1 Answers
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ਸਾਜਿਦ ਅਹਿਮਦ answered 4 months ago

Given:

m=150 kg

Speed(N)=1500 rpm

ω=2πN/60

=2×3.14×1500/60

ω=157 rad/s

ωn=20/100ω

√k/m=157/5

k=(150)(985.96)

k=1.48×10⁵ N/m

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