Patent ID: 8200443

Claim:
A device comprising: a rotary machine including a movable base, the movable base formed in an annular shape and configured to rotate around an axis so as to enable an object to move inside the annular shape; a vibration measuring instrument configured to, when the movable base is rotated, measure an amplitude of vibration of the rotary machine along each of the axis and a direction orthogonal to the axis; and means for calculating a position and a weight of an adjustment weight to be provided on the movable base based on the amplitude of vibration measured by the vibration measuring instrument, so that the weight of the adjustment weight can be adjusted, and the adjustment weight can be moved along the axis, wherein the position and the weight of the adjustment weight minimize the amplitude of vibration of the movable base; wherein the means for calculating comprises: means for obtaining first influence wave data from a difference between first adjustment amplitude data corresponding to a rotational angular position of the movable base measured orthogonally by the vibration measuring instrument when the adjustment weight having an arbitrary weight is arranged at an arbitrary circumferential position of the movable base, and the movable base including the adjustment weight is rotated, and second adjustment amplitude data corresponding to a rotational angular position of the movable base measured orthogonally by the vibration measuring instrument when the adjustment weight is changed by moving the adjustment weight circumferentially relative to the movable base or by increasing/decreasing the adjustment weight, and the movable base is rotated; means for obtaining an approximate expression of the first influence wave data based on the influence wave data and a change in the adjustment weight; and means for calculating first approximate influence wave data of the conditions of the adjustment weight by substituting a plurality of conditions of an arbitrary position and weight of the adjustment weight into the approximate expression.