| CPC G01B 11/002 (2013.01) [F01D 21/003 (2013.01); F01D 25/243 (2013.01); F05D 2260/31 (2013.01)] | 13 Claims |
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1. A method for estimating a flange displacement amount in a rotary machine,
the rotary machine comprising:
a rotor rotatable around an axis extending in a horizontal direction;
a casing covering an outer periphery of the rotor;
a stationary component disposed in the casing and attached to the casing; and
a base frame supporting the casing from below,
the casing comprising an upper-half casing on an upper side, a lower-half casing on a lower side, and a plurality of bolts fastening the upper-half casing to the lower-half casing,
the upper-half casing comprising an upper flange formed with an upper flange surface facing downward,
the lower-half casing comprising a lower flange formed with a lower flange surface facing upward and opposing the upper flange surface in a vertical direction and a first supported portion and a second supported portion continuous with the lower flange, supported by the base frame from below, and separated from each other in an axial direction in which the axis extends, and
the upper flange and the lower flange comprising bolt holes which penetrate therethrough in the vertical direction, the respective plurality of bolts being insertable into the bolt holes,
the method performing:
a measured coordinate receiving step of receiving measured three-dimensional coordinate data at a plurality of positions on the upper flange surface and measured three-dimensional coordinate data at a plurality of positions on the lower flange surface, the measured three-dimensional coordinate data being measured in an open state where the upper-half casing is not fastened to the lower-half casing by the plurality of bolts after the rotary machine is disassembled;
an effective coordinate determining step of determining effective three-dimensional coordinate data at a lower first position, a lower second position, and a lower target position by using the measured three-dimensional coordinate data at the plurality of positions on the lower flange surface, the lower first position being coincident with a first representative position of the first supported portion in a horizontal direction on a surface continuous with the lower flange surface, the lower second position being coincident with a second representative position of the second supported portion in the horizontal direction on a surface continuous with the lower flange surface, and the lower target position being a position on the lower flange surface from which a displacement amount in the vertical direction when a state changes from the open state to a fastened state where the upper-half casing is fastened to the lower-half casing by the plurality of bolts is to be obtained and determining effective three-dimensional coordinate data at an upper first position, an upper second position, and an upper target position by using the measured three-dimensional coordinate data at the plurality of positions on the upper flange surface, the upper first position being coincident with the first representative position of the first supported portion in the horizontal direction on a surface continuous with the upper flange surface, the upper second position being coincident with the second representative position of the second supported portion in the horizontal direction on a surface continuous with the upper flange surface, and the upper target position being coincident with the lower target position in the horizontal direction on the upper flange surface;
a coordinate change step of changing the effective three-dimensional coordinate data determined in the effective coordinate determining step such that the effective three-dimensional coordinate data at the lower first position and the effective three-dimensional coordinate data at the upper first position determined in the effective coordinate determining step are coincident with each other and that the effective three-dimensional coordinate data at the lower second position and the effective three-dimensional coordinate data at the upper second position determined in the effective coordinate determining step are coincident with each other; and
a displacement amount calculation step of calculating a displacement amount of the upper target position in the vertical direction and a displacement amount of the lower target position in the vertical direction when a state changes from the open state to the fastened state in accordance with a difference between a position in the vertical direction indicated by the effective three-dimensional coordinate data at the upper target position after the coordinate change step and a position in the vertical direction indicated by the effective three-dimensional coordinate data at the lower target position after the coordinate change step.
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