Method for estimating flange displacement amount in rotary machine, program for executing method, and device for performing method

A non-transitory computer-readable storage medium storing a computer program for estimating a flange displacement amount in a rotary machine,

• the rotary machine comprising:
• a rotor rotatable about 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 including 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 including an upper flange formed with an upper flange surface facing downward,
• the lower-half casing including 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 the first supported portion and the second supported portion being separated from each other in an axial direction in which the axis extends,
• the upper flange and the lower flange including bolt holes which extend therethrough in the vertical direction, the respective plurality of bolts being insertable into the bolt holes, and
• an upper surface of the first supported portion and an upper surface of the second supported portion being shifted in the vertical direction with respect to the lower flange surface,
• the program causing a computer to execute:
• receiving of 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 after the rotary machine is disassembled and in an open state where the upper-half casing is not fastened to the lower-half casing by the plurality of bolts;
• 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 to which a largest load is applied from the base frame in the first supported portion in a horizontal direction on a virtual plane continuous with the lower flange surface, the lower second position being coincident with a second representative position to which a largest load is applied from the base frame in the second supported portion in the horizontal direction on the virtual plane 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 in the horizontal direction on a virtual plane continuous with the upper flange surface, the upper second position being coincident with the second representative position in the horizontal direction on the virtual plane 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;
• 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 determining of the effective three-dimensional coordinate data are coincident with each other;
• and
• 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 changing of the effective three-dimensional coordinate data and a position in the vertical direction indicated by the effective three-dimensional coordinate data at the lower target position after the changing of the effective three-dimensional coordinate data,
• the determining of the effective three-dimensional coordinate data including:
• determining effective three-dimensional coordinate data at a lower edge first position indicating a position of a boundary with the first supported portion on the lower flange surface, a lower edge second position indicating a position of a boundary with the second supported portion on the lower flange surface, and the lower target position by using the measured three-dimensional coordinate data at the plurality of positions on the lower flange surface and determining effective three-dimensional coordinate data at an upper edge first position, an upper edge second position, and the upper target position by using the measured three-dimensional coordinate data at the plurality of positions on the upper flange surface, the upper edge first position being coincident with the lower edge first position in the horizontal direction on the upper flange surface, the upper edge second position being coincident with the lower edge second position in the horizontal direction on the upper flange surface;
• and
• estimating effective three-dimensional coordinate data at the lower first position and the lower second position from a change tendency of effective three-dimensional coordinate data at the plurality of positions on the lower flange surface including the lower edge first position and the lower edge second position and estimating effective three-dimensional coordinate data at the upper first position and the upper second position from a change tendency of effective three-dimensional coordinate data at the plurality of positions on the upper flange surface including the upper edge first position and the upper edge second position.

A device for estimating a flange displacement amount in a rotary machine,

• the rotary machine comprising:
• a rotor rotatable about 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 including 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 including an upper flange formed with an upper flange surface facing downward,
• the lower-half casing including 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 the first supported portion and the second supported portion being separated from each other in an axial direction in which the axis extends,
• the upper flange and the lower flange including bolt holes which extend therethrough in the vertical direction, the respective plurality of bolts being insertable into the bolt holes, and
• an upper surface of the first supported portion and an upper surface of the second supported portion being shifted in the vertical direction with respect to the lower flange surface,
• the device comprising:
• a measured coordinate receiving unit configured to receive 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 after the rotary machine is disassembled in an open state where the upper-half casing is not fastened to the lower-half casing by the plurality of bolts;
• an effective coordinate determining unit configured to determine 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 to which a largest load is applied from the base frame in the first supported portion in a horizontal direction on a virtual plane continuous with the lower flange surface, the lower second position being coincident with a second representative position to which a largest load is applied from the base frame in the second supported portion in the horizontal direction on the virtual plane 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 determine 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 in the horizontal direction on a virtual plane continuous with the upper flange surface, the upper second position being coincident with the second representative position in the horizontal direction on the virtual plane 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 unit configured to change the effective three-dimensional coordinate data determined by the effective coordinate determining unit 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 by the effective coordinate determining unit 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 by the effective coordinate determining unit are coincident with each other;
• and
• a displacement amount calculation unit configured to calculate 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 a coordinate change and a position in the vertical direction indicated by the effective three-dimensional coordinate data at the lower target position after the coordinate change,
• the effective coordinate determining unit including:
• a first processing unit configured to determine effective three-dimensional coordinate data at a lower edge first position indicating a position of a boundary with the first supported portion on the lower flange surface, a lower edge second position indicating a position of a boundary with the second supported portion on the lower flange surface, and the lower target position by using the measured three-dimensional coordinate data at the plurality of positions on the lower flange surface and determine effective three-dimensional coordinate data at an upper edge first position, an upper edge second position, and the upper target position by using the measured three-dimensional coordinate data at the plurality of positions on the upper flange surface, the upper edge first position being coincident with the lower edge first position in the horizontal direction on the upper flange surface, the upper edge second position being coincident with the lower edge second position in the horizontal direction on the upper flange surface;
• and
• a second processing unit configured to estimate effective three-dimensional coordinate data at the lower first position and the lower second position from a change tendency of effective three-dimensional coordinate data at the plurality of positions on the lower flange surface including the lower edge first position and the lower edge second position and estimate effective three-dimensional coordinate data at the upper first position and the upper second position from a change tendency of effective three-dimensional coordinate data at the plurality of positions on the upper flange surface including the upper edge first position and the upper edge second position.