Patent ID: 11859507
Assignee: GENERAL ELECTRIC COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 15:
16. The system of claim 14, wherein the calculation module calculating the prediction offset value includes:
determining a tilt angle of the HJ flange of the lower casing by calculating an angle between a first reference line extending through the first and second locations of the first and second optical targets in the top-on position and a second reference line extending through the third and fourth locations of the first and second optical targets in the top-off position;
identifying a triangular spatial relationship between the fifth location of the third reference point on the upper surface of the HJ flange of the lower casing, the sixth location of the fourth reference point on the upper surface of the HJ flange of the lower casing, and the third location of the first reference point at the first optical target;
determining a rotation angle of the HJ flange of the lower casing about the rotor axis by calculating an angle between a first vector extending from the rotor axis to the first location of the first optical target in the top-on position and a second vector from the rotor axis through the third location of the first optical target in the top-off position;
translating the triangular spatial relationship to the top-on position based on the first reference point at the first location in the top-on position and the rotation angle of the HJ flange of the lower casing about the rotor axis, the translating creating a predicted top-on location for the third reference point in the top-on position;
calculating any vertical difference between the fifth location of the third reference point as measured and the predicted top-on location for the third reference point; and
calculating the prediction offset value including a vertical adjustment based on any vertical difference and the tilt angle of the HJ flange of the lower casing.