Rotating machinery rotor operation state modal analysis method based on order extraction

Abstract

The embodiment of the invention discloses a rotating machinery rotor operation state modal analysis method based on order extraction, and relates to the field of vibration signal processing and system parameter recognition. According to the invention, harmonic interference generated by a rotating machinery rotor under the working states can be avoided, so reliability modal parameter recognition is improved and the method is suitable for vibration modal parameter recognition of the rotating machinery rotor under the working states. The method comprises steps of extracting order vibration signals of the rotating machinery rotor under the working states by use of the order tracing algorithm based on instantaneous estimation; and carrying out modal parameter recognition for the extracted the signal operation modal recognition algorithm.

Description

technical field [0001] The invention relates to the field of rotor vibration signal processing and rotor modal parameter identification, in particular to the field of vibration modal analysis in the running state. Background technique [0002] Vibration modal analysis is an indispensable means to obtain the dynamic characteristics of mechanical structures, and is the basis for vibration control, structural state monitoring, shock and noise reduction, mechanical structure fault diagnosis, and finite element model correction and confirmation. At present, the main methods are: finite element method, traditional test modal analysis method based on input and output modal data, and operating state modal analysis method based on only output data. The finite element method has outstanding advantages in solving the problem of rotating machinery composed of the rotor and the surrounding structure. However, in actual engineering, it is difficult to establish an accurate finite element...

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Problems solved by technology

The experimental modal analysis of rotating machinery is mainly carried out in the non-working state. Due to the lack of gyro torque and other factors, there may be a big difference from the test results in the operating state.

The traditional operating state modal analysis method generally requires the structure to be under the action of an exciting force with broadband characteristics. For rotating machinery, the operation of each rotating component will cause harmonic components closely related to the speed, which will give structural modal parameters identification cause great difficulty

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