Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Rotor Shaft Center Trajectory Purification Method Based on Binary Empirical Mode Decomposition

A technology of empirical mode decomposition and axis trajectory, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of not being able to observe the time change of the rotor axis trajectory, and achieve good self-adaptability Effect

Active Publication Date: 2017-10-03
ZHONGZHOU UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for purifying the rotor shaft center trajectory based on binary empirical mode decomposition, so as to solve the problem of not being able to observe the rotor shaft center due to the use of one-dimensional digital signal processing methods to analyze and process the vibration signals in the x direction and the y direction respectively. The problem of how trajectories change over time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Rotor Shaft Center Trajectory Purification Method Based on Binary Empirical Mode Decomposition
  • A Rotor Shaft Center Trajectory Purification Method Based on Binary Empirical Mode Decomposition
  • A Rotor Shaft Center Trajectory Purification Method Based on Binary Empirical Mode Decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0066] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0067] 1. If figure 1 As shown, the present invention utilizes the eddy current sensor to acquire signals in the horizontal direction and the vertical direction (using a frequency of 2048 Hz and a sampling duration of 0.5 s) through an orthogonal sampling technique. The signals here can be displacement signals or velocity signals. In this implementation In the example, a displacement signal is used.

[0068] The vibration signal collected in the horizontal direction is x(t), and the vibration signal in the vertical direction is y(t), and its waveform is as follows: Figure 2-a and Figure 2-b As shown, the vibration signal x(t), y(t) is composed of a complex signal, the complex signal z(t)=x(t)+jy(t), Figure 2-c is the Fourier spectrum of the signal x, Figure 2-d is the Fourier spectrum of the signal y, Figure 2-e It is a complex sig...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for purifying a rotor shaft center track based on binary empirical mode decomposition, and belongs to the technical field of rotating mechanical equipment. The present invention adopts the orthogonal sampling method to obtain the vibration signals in the mutually perpendicular direction of the same section of the rotor, and then forms a complex signal from two vertical vibration signals, and uses the complex signal as a binary rotation signal; and then passes through the binary empirical mode Decompose the binary rotation signal into several signals in the order of rotation speed from high to low, and perform full vector spectrum analysis on the separated binary rotation signal, and analyze the frequency information of each complex signal according to the full vector spectrum. The signal obtained by adding complex signals whose frequency is the fundamental frequency or less than the fundamental frequency is the axis trajectory of the rotor. The axis trajectory is displayed in the form of a three-dimensional time-domain waveform graph, and the change of the axis trajectory with time can be obtained.

Description

technical field [0001] The invention relates to a method for purifying a rotor shaft center track based on binary empirical mode decomposition, and belongs to the technical field of rotating mechanical equipment. Background technique [0002] As an important state characteristic parameter of rotating machinery, axis trajectory can reflect the operation status of the equipment simply, intuitively and visually, and it reflects the actual operation status of the rotor. The trajectory of the rotor axis is composed of vibration signals in the same cross-section of the rotor in directions perpendicular to each other (such as the x direction and the y direction). [0003] At present, a lot of research has been done on the purification of the axis trajectory, including the purification of the rotor axis trajectory based on the harmonic window method; the purification of the axis trajectory by the short-time Fourier transform transient; the purification of the rotor axis trajectory b...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 黄传金杨世锡陈晓宋海军周铜孟雅俊雷文平李凌均
Owner ZHONGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com