Verification method and device for modal analysis of steam turbine rotor

Abstract

The invention discloses a verification method and device for modal analysis of a steam turbine rotor, relates to the technical field of steam turbines, and can solve the problems that when the modal analysis of the steam turbine rotor is carried out, the test qualification rate of a product is low, and the accuracy requirement of analysis and verification of the modal of the steam turbine rotor cannot be met. The method comprises the following steps: acquiring first test data in a cold-state shutdown process before weighting and second test data in a hot-state shutdown process; eliminating hot bending of the rotor through low-rotating-speed operation, and carrying out weighting processing according to an Overhang Mode when it is judged that vibration of the rotor is stable; if it is judged that excitation vibration caused by weighting is sufficient, extracting third test data in the cold-state shutdown process after weighting and fourth test data in the hot-state shutdown process; and determining a verification result of modal analysis of the steam turbine rotor according to the first test data, the second test data, the third test data and the fourth test data. The method and the device are suitable for verification of steam turbine rotor modal analysis.

Description

technical field [0001] The present application relates to the technical field of steam turbines, in particular to a verification method and device for modal analysis of steam turbine rotors. Background technique [0002] According to the requirements of the international standard "API612 Steam Turbine for Petroleum, Petrochemical and Natural Gas Industry" in the steam turbine industry, the rotor of the steam turbine should undergo a rotor modal verification test. Vibration is stimulated by increasing the additional centrifugal force at an appropriate position on the rotor, and using the vector subtraction of the vibration data of the rotor before and after the weighting, the vibration caused by the additional external excitation on the rotor is obtained. Comparing the vibration data with the theoretical mode of the rotor, it is required that the vibration amplitude caused by the additional external excitation is smaller than the theoretical prediction value. [0003] At pre...

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Problems solved by technology

[0005] In view of this, this application provides a verification method and device for modal analysis of steam turbine rotors, the main purpose of which is to solve the problem of low product test pass rate and failure to meet the requirements of steam turbine rotor modal analysis. The question of the precision requirements of the analytical validation

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