Development of methodological support for turbine unit shaft defect and stress monitoring systems at thermal power stations and atomic power stations with application of shaft displacement sensors

摘要

It is proposed a modern concept and a set of methods for monitoring of the technical condition of system "turboset's shafting - journal bearings - support units". Technology is developed as an integral part of domestic multipurpose COMPACS system. The system input data covers: - design, technological, mounting and operating parameters of the turbine unit; - absolute vibration of supports and control points of the shafting line; - relative displacement and vibration in the rotor journals according to GOST R 55263-2012. Also, the system includes as precomputed: - mounting line of the shafting in cold state; - for each journal bearing, static and dynamic properties of the bearing oil film in domain of possible motion (DPM are given; - static and dynamic properties of supports; - matrix of influence of displacements of supports on the forces in supports of the shafting. While in operation, the methods allow to determine static and dynamic loads on the supports of turboset, to determine misalignment of supports and to evaluate corrective alignments of the supports and centering of coupling halves. Also, stress in the rotor pins, welded joints and coupling bolts are computed. We suggest an automatic conclusion on compliance of the technical condition of turboset with safety levels, identification of source of malfunction and recommendations for necessary measures. The work covers some procedures, including ways of determination of stiffness of supports, a method of determination of above mentioned matrix of influence and a method of inverse problem solution - determination of misalignments of the supports based on determination of position of rotor journals in the bearing bores. We have shown the results of static characteristic modeling by an example of turbine unit 1000 MW for atomic power stations.