According to the above configuration, since a hollow part is formed in the rotating shaft, {HEAD ~ the weight} of the rotor can be reduced with {TAIL ~ hardly any decrease} in the natural frequency of the rotor 
reduced with
According to the above configuration , since a hollow part is formed in the rotating shaft , { HEAD ~ the weight } of the rotor can be reduced with { TAIL ~ hardly any decrease } in the natural frequency of the rotor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH