Quantitative diagnosis method for rotor mass unbalance fault of steam turbine generator unit

Abstract

The invention belongs to the technical field of rotating mechanical condition monitoring and fault diagnosis, and particularly relates to a quantitative diagnosis method for a rotor mass unbalance fault of a steam turbine generator unit. Firstly, rotating speed, vibration and other data of shafts of the steam turbine generator unit are collected, analyzed and stored, and the time sequence of difference values of absolute vibration displacement power frequency components of all bearings in the measuring direction under identical operation conditions before and after the fault is generated is obtained through calculation; secondly, equivalent loads caused by mass unbalance are calculated, and the position of the fault and the lower limit of unbalance amount are determined; finally, the size and the phase angle of the unbalance amount of a rotor are determined by adopting an optimized least square support vector machine agent model and a particle swarm optimization based on simulated annealing. The quantitative diagnosis method for the rotor mass unbalance fault of the steam turbine generator unit can quantitatively diagnose the position and the size of the rotor mass unbalance fault of the steam turbine generator unit accurately and fast, provides a basis for site rotor dynamic balancing, and improves dynamic balancing efficiency.

Description

technical field [0001] The invention belongs to the technical field of state monitoring and fault diagnosis of rotating machinery, and in particular relates to a quantitative diagnosis method for a mass imbalance fault of a steam turbine generator set rotor. Background technique [0002] The steam turbine generator set is an important equipment for power production. It converts the internal energy of high-temperature and high-pressure steam into the kinetic energy of the rotor rotation of the unit, thereby driving the generator to generate electricity. Generally, the working speed of a large unit reaches 3000r / min, and the span of the shafting is 30-50m. It has the characteristics of huge scale, weight and load, complex and changeable working conditions, and high price. Due to the coupling effect of multiple fields such as machine, electricity, network, and heat, the operation of the unit is very complicated, resulting in various failures such as vibration of the shaft syste...

AI Technical Summary

Problems solved by technology

Generally, the working speed of large-scale units reaches 3000r / min, and the span of the shafting system is 30-50m. It has the characteristics of huge scale, weight and load, complex and changeable working conditions, and high price.

Due to the coupling effect of multiple fields such as machine, electricity, network, heat, etc., the operation of the unit is very complicated, resulting in various failures such as vibration of the shaft system of the unit, which affects the continuous and stable operation of the unit

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