When mass of mid-span is lesser than that of overhung rotor, the response of system will decrease.
而当中间盘比外伸盘质量小很多时，系统的振动响应会降低。
For some overhung rotors of great-width disks, such as the rotor of the vertical centrifuge, this kind of approximation will cause larger calculating errors.
对于某些具有宽圆盘(如离心机转鼓)的悬臂转子，这种近似会引起较大的计算误差。
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