CN-121978365-A - Rotation speed estimation method and system of rotating equipment based on quantitative analysis and electronic equipment

CN121978365ACN 121978365 ACN121978365 ACN 121978365ACN-121978365-A

Abstract

The invention relates to the technical field of rotating equipment rotating speed estimation, and discloses a rotating equipment rotating speed estimation method, a rotating equipment rotating speed estimation system and electronic equipment based on quantitative analysis, wherein the method comprises the steps of collecting a rotating equipment vibration signal, and obtaining an envelope demodulation spectrum through bandpass filtering and envelope demodulation processing; K frequencies with highest amplitude values are selected from the spectrum, K candidate fundamental frequencies are calculated according to the affiliated harmonic interval and the corresponding orders, frequency deviation degree and amplitude contribution degree indexes of multi-order harmonic waves are calculated for each candidate fundamental frequency, a single-order harmonic evaluation value is obtained according to the frequency deviation degree and the amplitude contribution degree indexes, penalty coefficient weighting summation is introduced to obtain a comprehensive evaluation index, the candidate fundamental frequency with the highest index is selected as an estimated fundamental frequency, and the estimated rotating speed is calculated. The method realizes quantitative analysis of the rotation speed estimation, avoids subjectivity of the traditional method, synthesizes multidimensional indexes, improves accuracy and reliability under complex working conditions, does not need to additionally arrange a rotation speed sensor, reduces cost and installation difficulty, and is suitable for monitoring various rotary equipment.

Inventors

ZHU CHUANGCHUANG
WANG YUEMIAO
Ai Zhenpeng
LIU JIA

Assignees

广东华之源信息工程有限公司
广州佳都智通科技有限公司
佳都科技集团股份有限公司
广州华佳软件有限公司
广州佳都城轨智慧运维服务有限公司

Dates

Publication Date: 20260505
Application Date: 20251215

Claims (10)

1. A method for estimating rotational speed of a rotating device based on quantitative analysis, comprising: collecting vibration signals generated in the running process of the rotating equipment, and carrying out band-pass filtering and envelope demodulation processing on the vibration signals to obtain an envelope demodulation spectrum; k frequencies with highest amplitude values are selected from the envelope demodulation spectrum, K is a preset positive integer, and K candidate fundamental frequencies are obtained through calculation according to a harmonic interval to which each frequency belongs and a corresponding harmonic order; For each candidate fundamental frequency, calculating a frequency deviation index and an amplitude contribution index of the candidate fundamental frequency under a plurality of harmonic orders respectively; Calculating a single-order harmonic evaluation value of each order harmonic based on the frequency deviation index and the amplitude contribution index, and introducing a penalty coefficient to carry out weighted summation on each single-order harmonic evaluation value to obtain a comprehensive evaluation index value of the candidate fundamental frequency; And selecting the candidate fundamental frequency with the highest comprehensive evaluation index as an estimated fundamental frequency, and calculating the estimated rotating speed of the rotating equipment according to the estimated fundamental frequency.
2. The method of claim 1, wherein said performing bandpass filtering and envelope demodulation processing on said vibration signal to obtain an envelope demodulation spectrum comprises: setting a low-frequency cutoff frequency and a high-frequency cutoff frequency according to the operation characteristics of the rotating equipment and the frequency band characteristics of the vibration signals so as to perform band-pass filtering processing on the collected vibration signals; performing Hilbert transformation on the filtered signals to generate corresponding analysis signals, and obtaining envelope signals by calculating absolute values of the analysis signals; and performing discrete Fourier transform on the envelope signal to obtain an envelope demodulation spectrum representing the low-frequency fundamental frequency and harmonic characteristics thereof.
3. The method according to claim 1 or 2, wherein the selecting K frequencies with highest amplitudes from the envelope demodulation spectrum, where K is a preset positive integer, and calculating K candidate fundamental frequencies according to a harmonic interval to which each frequency belongs and a harmonic order corresponding to the harmonic interval, includes: Calculating rated rotation frequency based on rated rotation speed of the rotating equipment, and dividing the envelope demodulation spectrum into M harmonic intervals according to the rated rotation frequency, wherein each interval corresponds to a frequency value range of 1-M-order harmonic; K frequencies with highest amplitude values are screened out from the envelope demodulation spectrum, the corresponding harmonic orders of the frequencies are determined according to the harmonic interval where each frequency is located, and the frequencies are divided by the corresponding harmonic orders, so that K candidate fundamental frequencies are obtained.
4. The method according to claim 1, wherein the frequency deviation index is used to quantify the degree of deviation between the current frequency value and the candidate fundamental frequency, calculated by the following formula: In the formula, The frequency to be evaluated is indicated and, Representing the candidate fundamental frequency, The order of the harmonics is represented and, The ratio of the frequency to the error is expressed, Representing the absolute error frequency of the signal, An index indicating the degree of deviation of the current frequency from the candidate fundamental frequency, wherein a larger index value indicates a greater probability that the current frequency is a harmonic of the candidate fundamental frequency, and a variation range of the index value is 。
5. The method according to claim 1 or 4, wherein the amplitude contribution index is calculated based on the amplitude corresponding to the frequency, and is used for quantitatively evaluating the degree of confidence as a candidate fundamental frequency harmonic at the amplitude level, and is calculated by the following formula: In the formula, The order of the harmonics is represented and, Representing the amplitude corresponding to the current frequency, Representing the highest amplitude in the spectrogram, The method is used for representing the importance degree of the harmonic amplitudes of different orders, and under the condition that the amplitude is unchanged, the importance degree is higher as the order is lower; Representing the effective amplitude ratio.
6. The method according to claim 5, wherein the comprehensive evaluation index value is calculated by the following formula: In the formula, Represents punishment coefficient, and the value range is , The order of the largest harmonic is represented, Represent the first The single-order harmonic evaluation value of the order harmonic is calculated by the following formula: In the formula, Represent the first The frequency deviation index value of the order harmonic, Represent the first Amplitude contribution index value of order harmonic.
7. A rotational speed estimation system for a rotating apparatus based on quantitative analysis, comprising: The signal processing module is used for collecting vibration signals generated in the running process of the rotating equipment, and carrying out band-pass filtering and envelope demodulation processing on the vibration signals to obtain an envelope demodulation spectrum; The candidate fundamental frequency generation module is used for selecting K frequencies with highest amplitude values from the envelope demodulation spectrum, wherein K is a preset positive integer, and K candidate fundamental frequencies are obtained through calculation according to a harmonic interval to which each frequency belongs and a corresponding harmonic order; The index calculation module is used for calculating frequency deviation index and amplitude contribution index of each candidate fundamental frequency under a plurality of harmonic orders respectively; the comprehensive evaluation module is used for calculating single-order harmonic evaluation values of all the orders of harmonic waves based on the frequency deviation index and the amplitude contribution index, and introducing a penalty coefficient to carry out weighted summation on all the single-order harmonic evaluation values so as to obtain a comprehensive evaluation index value of the candidate fundamental frequency; and the rotating speed estimation module is used for selecting the candidate fundamental frequency with the highest comprehensive evaluation index as an estimated fundamental frequency and calculating the estimated rotating speed of the rotating equipment according to the estimated fundamental frequency.
8. An electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the quantitative analysis-based rotational speed estimation method of a rotating device of any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon computer instructions for causing a computer to execute the quantitative analysis-based rotational speed estimation method of a rotating apparatus according to any one of claims 1 to 6.
10. A computer program product comprising computer instructions for causing a computer to perform the quantitative analysis-based rotational speed estimation method of any one of claims 1 to 6.

Description

Rotation speed estimation method and system of rotating equipment based on quantitative analysis and electronic equipment Technical Field The invention relates to the technical field of rotating equipment rotating speed estimation, in particular to a rotating equipment rotating speed estimation method and system based on quantitative analysis and electronic equipment. Background The core fault sources of the escalator are concentrated in rotating equipment such as a motor, a bearing, a gear box, a driving shaft and the like, the rotating speed information is key basic data for detecting and diagnosing faults of the rotating equipment, whether the faults are caused by bearing abrasion, abnormal gear engagement or motor unbalance and the like, the characteristic signals are directly related to the actual rotating speed of the equipment, and the accurate rotating speed data can greatly improve the accuracy and the diagnosis efficiency of fault positioning. However, in practical applications, due to the difficulty of installation space, cost control and equipment transformation, a dedicated rotation speed sensor cannot be deployed for all rotating components on a large scale, and therefore, the rotation speed needs to be estimated indirectly through existing signals (such as vibration and current signals). The existing rotation speed estimation scheme is mostly based on a frequency domain analysis thought that a candidate frequency range is set first, after frequency domain transformation is carried out on vibration or current signals, the frequency with the largest amplitude in a reference range is selected as a fundamental frequency to calculate the rotation speed. The method has the obvious defects that firstly, the fundamental frequency identification relies on expert experience to carry out qualitative judgment, subjectivity is strong, different personnel are easy to operate to generate result deviation, secondly, only first harmonic waves are concerned, multi-order harmonic information is ignored, so that the fundamental frequency selection has accidental and cannot quantify result reliability, thirdly, low-frequency interference, high-frequency noise and complex electromagnetic interference under actual working conditions are easy to mask actual fundamental frequency characteristics, so that the rotating speed estimation result has poor stability and high error rate, and the actual requirement of escalator high-reliability monitoring is difficult to meet. Disclosure of Invention In order to solve the problems that the conventional rotating equipment rotating speed estimation method based on vibration or current signals relies on expert experience to perform qualitative judgment, only first harmonic waves are considered, and results are high in subjectivity, difficult to quantify in reliability and poor in stability, the invention provides the rotating speed estimation method based on quantitative analysis, the rotating speed estimation system based on quantitative analysis and electronic equipment, quantification of a rotating speed identification process is achieved, dependence on expert experience is remarkably reduced, multi-order harmonic wave information is considered, and robustness and stability of identification results are improved. The practical application effect is obvious, and the accuracy of the rotation speed estimation is obviously improved. In a first aspect, the present invention provides a method for estimating a rotational speed of a rotating device based on quantitative analysis, including: collecting vibration signals generated in the running process of the rotating equipment, and carrying out band-pass filtering and envelope demodulation processing on the vibration signals to obtain an envelope demodulation spectrum; k frequencies with highest amplitude values are selected from the envelope demodulation spectrum, K is a preset positive integer, and K candidate fundamental frequencies are obtained through calculation according to a harmonic interval to which each frequency belongs and a corresponding harmonic order; For each candidate fundamental frequency, calculating a frequency deviation index and an amplitude contribution index of the candidate fundamental frequency under a plurality of harmonic orders respectively; Calculating a single-order harmonic evaluation value of each order harmonic based on the frequency deviation index and the amplitude contribution index, and introducing a penalty coefficient to carry out weighted summation on each single-order harmonic evaluation value to obtain a comprehensive evaluation index value of the candidate fundamental frequency; And selecting the candidate fundamental frequency with the highest comprehensive evaluation index as an estimated fundamental frequency, and calculating the estimated rotating speed of the rotating equipment according to the estimated fundamental frequency. According to the rotating equipment rotating speed estimat