Crankle coupling vibration characteristic analysis method of steamer power unit rubbing breakdown

Abstract

The invention discloses a crankle coupling vibration characteristic analysis method of steamer power unit rubbing breakdown in the technical field of revolving machinery rotor dynamics. By means of the method, a thought of a step-by-step integral method is combined with a traditional delivering matrix method. Each quantity in a non-linear equation set is transformed in increment. The non-linear differential equation is transformed to a linear differential equation about a vibration state increment. A matrix expression is delivered based on the crankle coupling vibration increment varied of Riccati and a unit is set up. External force and external force moment calculated with a plurality of iterations are substituted, and transient vibration response analysis of the crankle coupling vibration can be carried out when the unit is rubbed. The crankle coupling vibration characteristic analysis method of steamer power unit rubbing breakdown can be suitable for a complex rotor system similar to the steamer generator set. Analysis results are precise. The crankle coupling vibration characteristic analysis method of steamer power unit rubbing breakdown can be used for a solution of a strong-nonlinearity system. Application of the traditional delivering matrix method in the non-linear field is expanded.

Description

technical field [0001] The invention belongs to the technical field of rotor dynamics of rotating machines, and in particular relates to a method for analyzing the bending-torsion coupling vibration characteristics of a rubbing fault of a steam turbine generator set. Background technique [0002] With the development of turbogenerators in the direction of large capacity and high efficiency, the gap between the rotor and the stator is getting smaller and smaller, resulting in the frequent occurrence of rubbing faults of the rotor and stator, which has become one of the serious main failure modes of the unit. Once rubbing occurs, it will often lead to structural damage of the unit, and even lead to catastrophic consequences. Therefore, to study the vibration characteristics of dynamic and static friction of large rotating machinery, it is necessary to make full use of vibration signals to diagnose friction faults and prevent rotor friction from transitioning to the middle and l...

AI Technical Summary

Problems solved by technology

At present, many scholars have conducted research in this area, but most of these studies are aimed at simple rotor systems like Jeffcott rotors, while studies on rubbing faults of complex rotor systems (such as turbogenerator rotor systems) are relatively rare. The complex rotor system has more complex dynamic characteristics than the simple rotor system, so it is necessary to study the rubbing fault of the complex rotor system to reveal its dynamic characteristics

The methods for analyzing complex rotor systems mainly include modal superposition method, direct time domain integration method and transfer matrix method. For a rotor system with a chain structure such as a steam turbine generator set, the transfer matrix method is a simple and effective method; Due to the mutual coupling of bending vibration and torsional vibration parameters of the shaft system when the rubbing failure of the unit occurs, the shaft system of the unit is a highly complex nonlinear vibration system. For such a system, it is no longer possible to use some solving methods in the linear vibration theory. Be applicable

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