研究目的
To determine the fundamental harmonic of the turbine rotor journal surface for the conditions of its location on this surface in the one-half of the plain bearing cylinder of the power unit case.
研究成果
The research concludes that combining point clouds of semi-cylinders using the shaft face mark and center hole is accurate and practical. The method of determining the fundamental harmonic using points with maximum radius vectors in each angular position is reliable for determining the conditions of the shaft location on the bearing bottom half. The approach of selecting fundamental harmonics of circularity deviation using the boundary contour is practical and based on trivial dependencies of harmonic analysis.
研究不足
The method requires access to the shaft face and center hole for accurate point cloud combination. Real surface defects and measurement errors can affect the accuracy of the point cloud.
1：Experimental Design and Method Selection:
The methodology involves the use of a 3D scanner to create a digital double of the turbine rotor journal surface in the form of a point cloud. The design rationale is based on the need to accurately determine the form of the journal surface to minimize circularity deviation during restoration.
2：Sample Selection and Data Sources:
The samples are turbine rotor journals with various wear patterns. Data is acquired through 3D scanning of the journal surfaces.
3：List of Experimental Equipment and Materials:
Equipment includes a 3D scanner (FARO Laser Tracker ION (IFM)), dial indicator, control straightedges (Lineika LCh-1-500 GOST 8026-92), and a tripod for the CMM.
4：Experimental Procedures and Operational Workflow:
The procedure involves installing a dial indicator and straightedges on the turbine casing, marking the shaft face, and using a 3D scanner to obtain point clouds of the journal surface. The shaft is then rotated to obtain point clouds of the entire journal surface.
5：Data Analysis Methods:
The analysis involves calculating the maximum radius vectors for each axial plane of the shaft journal and performing harmonic analysis to determine the fundamental harmonic of the contacting contour.
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