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A multi-scale analysis method for plant vibration

A vibration velocity and factory building technology, applied in the direction of instruments, complex mathematical operations, informatics, etc., can solve problems such as endpoint effects, energy leakage, mode mixing, etc., achieve high feature extraction accuracy, good field practicability, and suppress mode The effect of state aliasing

Active Publication Date: 2021-09-07
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Abstract
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  • Application Information

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Problems solved by technology

Commonly used methods to deal with complex non-stationary signals include wavelet analysis, empirical mode decomposition, etc. However, wavelet analysis is based on adjustable window Fourier transform, which has the problem of energy leakage, and empirical mode decomposition has modal mixing. issues such as overlap and endpoint effects

Method used

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  • A multi-scale analysis method for plant vibration
  • A multi-scale analysis method for plant vibration
  • A multi-scale analysis method for plant vibration

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0020] Such as figure 1 As shown, the plant vibration multi-scale analysis method provided by the present invention comprises the following steps:

[0021] 1) Obtain the horizontal vibration velocity signals of wind hood +Y in the middle layer of the hydropower plant under different working conditions.

[0022] Field tests were carried out on the vibration of the powerhouse of the hydropower station, and the horizontal vibration velocity signals of the wind cover + Y in the middle layer were obtained under different working conditions. The working conditions adopted in the present invention are power generation 150MW, power generation 300MW, pumping conditions and pump...

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Abstract

The invention relates to a multi-scale analysis method for powerhouse vibration, which is characterized in that it comprises the following steps: Step 1): Obtain the horizontal vibration velocity signals of the wind cover + Y in the middle layer of the powerhouse of a hydropower station under different working conditions; Step 2): adopt The self-adaptive iterative filtering method decomposes the horizontal vibration velocity signal of the wind cover + Y in the middle layer of the hydropower plant under each working condition, and obtains several stationary components corresponding to the horizontal vibration velocity signal of the wind cover + Y in the middle layer under each working condition ; Step 3): based on the percentile method, using several stationary components corresponding to the horizontal vibration velocity signal of the wind cover +Y of the middle layer of the hydropower plant building under each working condition, constructing the standard eigenvector of the plant vibration, which is used to identify the structure of the plant The multi-scale analysis of powerhouse vibration is completed, and the invention can be widely used in the field of operation and maintenance of powerhouse structures of hydropower stations.

Description

technical field [0001] The invention relates to a multi-scale analysis method for plant vibration, and belongs to the technical field of on-line monitoring and state detection. Background technique [0002] The powerhouse of a hydropower station is a building in a hydropower station where hydroturbines, hydroelectric generators and various auxiliary equipment are installed. It is not only a complex of hydraulic buildings, machinery and electrical equipment, but also a place for operating personnel to carry out production activities, keeping its structure stable. Particularly important. In order to ensure the structural safety of the powerhouse, real-time monitoring of the vibration of the powerhouse can reflect the vibration of the sensitive structure, avoid abnormal occurrences, and provide a strong guarantee for the safe and stable operation of the powerhouse of the hydropower station. The powerhouse of a hydropower station is a group of super-large underground caverns. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCG16Z99/00
Inventor 安学利潘罗平田雨赵明浩刘娟
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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