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A 100 kg turbine operates at 2000 rpm, what percent isolation is achieved if the turbine is mounted on four identical springs in parallel each of stiffness 3×105N/m
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wn=4km=4×3×105100=109.54 rad/sec. w=2πN60=2π×200060=209.44 rad/sec r=209.44109.54=1.91 Tr=11r211(1.91)2=0.377 ηiso=1Tr.o

= 1 …

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