Dynamic balance suppression method for spatial vibration of high-speed rotor bearing system

Abstract

The invention discloses a dynamic balance suppression method for spatial vibration of a high-speed rotor bearing system. On the basis of testing spatial vibration of the high-speed rotor bearing system, the incidence relation between the displacement and vibration motion track area and the amount of unbalance is given, an optimized objective function involving rotor displacement and bearing vibration is established, synchronous suppression of rotor displacement and bearing vibration is achieved in combination with an optimization method, both promotion of rotor rotation precision and suppression of unbalance vibration energy are taken into consideration, and the proportions of displacement and vibration suppression effects in different directions and on different sections are controlled through configuration of weight coefficients. The dynamic balance suppression method overcomes the defects that according to traditional vibration suppression methods, rotor displacement or bearing vibration is seldom taken into comprehensive consideration, most of vibration tests are implemented only in a single direction or on a single section, and consequently it is unable to attend to everything at once occasionally. Compared with the traditional methods, the dynamic balance suppression method has the advantages that the vibration control effect of the rotor bearing system can be optimal, and the service life of the system can be prolonged effectively while the running accuracy of the system is guaranteed.

Description

technical field [0001] The invention relates to a fault diagnosis and vibration control method for rotating equipment, in particular to a dynamic balance suppression method for space vibration of a high-speed rotor bearing system. The method can simultaneously realize the comprehensive control of the absolute displacement of the high-speed rotor and the relative vibration of the bearing base. Background technique [0002] The spatial vibration trajectory of the high-speed rotor bearing system is relatively complex, but its vibration signals mostly present stable signal characteristics, such as pure unbalance vibration, and vibration caused by factors such as poor alignment, periodic cutting excitation, thermal deformation, and periodic environmental interference. However, when the unbalance fault is serious, the rotor collides and rubs during operation, and the original sinusoidal fluctuation will change into a non-stationary vibration waveform. In addition, the flexibility ...

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Problems solved by technology

[0005] The absolute displacement of the rotor and the relative vibration of the bearing base respectively represent the rotation accuracy and the unbalanced vibration energy. The existing research on the space vibration suppression of the rotor bearing system does not consider both the rotor displacement and the bearing vibration. They are both independently analyzed or optimized.

It is precisely because the existing dynamic balancing methods rarely consider the two types of vibrations comprehensively, and sometimes the phenomenon of taking care of one and losing the other occurs in the balancing operation.

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