CN112179638B - Multi-frequency resolution analysis method for synchronous sampling of rotating equipment - Google Patents
Multi-frequency resolution analysis method for synchronous sampling of rotating equipment Download PDFInfo
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- CN112179638B CN112179638B CN202011037507.6A CN202011037507A CN112179638B CN 112179638 B CN112179638 B CN 112179638B CN 202011037507 A CN202011037507 A CN 202011037507A CN 112179638 B CN112179638 B CN 112179638B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a multi-frequency resolution analysis method for synchronous sampling of rotating machinery, which comprises the following steps: determining the sampling frequency resolution of each component to be monitored according to the fault characteristic frequency of each component to be monitored of the unit or the pump set to be tested, and calculating the length of sampling data and the number of sampling data segments; after synchronously sampling the running state signals of the components to be monitored, continuously intercepting to obtain a signal segment with a preset sampling point number; connecting the signal segments of the preset sampling points according to the number of the sampling data segments to obtain an expected sampling signal of the sampling data length; and calculating the actual frequency resolution of the operation state signal of each component to be monitored, and performing spectrum analysis on the expected sampling signal. The invention can analyze the running state signals of different parts with different frequency resolutions, provides powerful basis for distinguishing the transmission and interference of faults between different parts, and has wide industrial application prospect.
Description
Technical Field
The invention relates to the technical field of signal acquisition and equipment state monitoring, in particular to a multi-frequency resolution analysis method for synchronous sampling of rotating equipment.
Background
The rotating device is generally composed of a plurality of components, and different components are required to be matched with each other to realize the whole function of the system while realizing respective functions. In order to find out abnormal operation of the rotating equipment in time and accurately find out the abnormal operation component of the rotating equipment in the working process, the state of the abnormal operation component needs to be monitored, and the operation state information of a plurality of components needs to be collected generally. For example, when vibration monitoring is performed on a rotating device, it is generally required to acquire vibration signals of a plurality of components.
Because the characteristic frequencies of various component faults are different, the synchronous acquisition mode is adopted to acquire signals, which is beneficial to distinguishing the transmission and interference of fault signals among components. Therefore, in engineering practice, the same sampling frequency is preferably adopted for collecting vibration data of all parts of the same rotating speed unit or pump set, namely synchronous sampling is carried out. However, the same frequency resolution is obtained when the spectrum analysis is performed by using the same sampling frequency to acquire the operating state information of the components, so that the effective resolution and identification of the high-frequency fault components and the low-frequency fault components of different components cannot be simultaneously considered.
Taking the state monitoring of the pump group as an example, the running states of the motor and the pump need to be monitored, the frequency resolution required by the motor is low, and the pump has some high-frequency fault components and needs high analysis frequency. If the same sampling frequency is used, e.g. fs10kHz, 1024 sampling points, and a calculation formula of frequency resolution, wherein f is equal to fsAnd/n, the frequency resolution obtained is 9.766Hz, which makes it difficult to distinguish the fault components of the motor (the frequency resolution for diagnosing motor faults is preferably ≦ 0.3Hz) because many fault frequencies of the motor are concentrated in the low frequency band (around approximately 50 Hz). Therefore, it is necessary to design a multi-frequency resolution analysis method for synchronous sampling in the same unit or pump set.
Disclosure of Invention
The present invention is directed to solving the problems described above. It is an object of the present invention to provide a multi-frequency resolution analysis method that solves the above problems. In particular, the invention provides a multi-frequency resolution analysis method capable of simultaneously sampling a plurality of components of a unit or a pump group.
The invention provides a multi-frequency resolution analysis method for synchronous sampling of rotating equipment, which comprises the following steps:
a01: determining the sampling frequency resolution of each component to be monitored according to the fault characteristic frequency of each component to be monitored of a unit or a pump set to be tested, calculating the length of sampling data of each component to be monitored, and calculating the number of sampling data segments of each component to be monitored according to the length of the sampling data;
a02: after synchronously sampling the running state signals of the components to be monitored, continuously intercepting to obtain a signal segment with a preset sampling point number;
a03: connecting the signal segments of the preset sampling points according to the number of the sampling data segments to obtain an expected sampling signal of the sampling data length;
a04: and calculating the actual frequency resolution of the running state signal of each component to be monitored, and performing spectrum analysis on the expected sampling signal according to the actual frequency resolution.
Wherein the synchronously sampling the operating state signals of the components to be monitored comprises:
and synchronously sampling the running state signals of the components to be monitored according to a preset sampling frequency and a preset sampling point number.
Wherein the operation state signal comprises a vibration signal and a physical phase signal.
Wherein the number of segments of the signal segment included in the expected sampling signal is greater than or equal to the number of segments of the sample data.
The multi-frequency resolution analysis method can realize the analysis of different frequency resolutions on the running state signals of different components when synchronously sampling a plurality of components of a unit or a pump set, meets the requirements on the fault analysis of different frequency bands, thereby providing a powerful basis for distinguishing the transmission and interference of faults between different components and having wide industrial application prospect.
Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 schematically shows a flow chart of an implementation of the multi-frequency resolution analysis method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The inventor designs a multi-frequency resolution analysis method, which analyzes synchronous sampling signals of a plurality of components of a unit or a pump set with different frequency resolutions, meets the requirements of fault analysis of different frequency bands, and provides powerful basis for distinguishing transmission and interference of faults among different components.
The following describes a multi-frequency resolution analysis method for synchronous sampling of a rotating device according to the present invention in detail with reference to the accompanying drawings.
Fig. 1 shows a flow chart of an implementation of the multi-frequency resolution analysis method of the present invention, and referring to fig. 1, the multi-frequency resolution analysis method is used for analyzing different frequency resolutions of synchronous sampling signals of each monitoring component of a unit or a pump group, and specifically includes the following steps:
step A01: determining the sampling frequency resolution delta f of each component to be monitored according to the fault characteristic frequency of each component to be monitored of the unit or the pump set to be testediAnd use of Ni＝fs/ΔfiCalculating the sampling data length N of each part to be monitorediWherein f issPresetting sampling frequency for each part to be monitored; according to the length N of the sampling dataiCalculating the number S of sampling data segments of each part to be monitoredi＝NiN, wherein n is the number of preset sampling points of each part to be monitored;
step A02: after synchronously sampling the running state signals of all the parts to be monitored, carrying out uninterrupted interception to obtain a signal segment with a preset sampling point number n;
step A03: according to the samplingNumber of data segments SiConnecting signal segments with preset sampling point number N to obtain sampling data with length of NiThe expected sampled signal of (a);
step A04: according to the formula Δ fi′＝fs/NiCalculating the actual frequency resolution Deltaf of the operating state signal of each component to be monitorediAccording to the actual frequency resolution Δ fiThe desired sampled signal obtained in step a03 is subjected to spectral analysis.
In step a02, the synchronously sampling the operation state signals of the components to be monitored comprises: and synchronously sampling the running state signals of the components to be monitored according to a preset sampling frequency and a preset sampling point number. The preset sampling frequency and the preset sampling number both need to meet the real-time requirement of the whole monitoring system.
In the method, the operation state signal of each component to be monitored comprises: a vibration signal and a physical phase signal.
In step a03, the number of segments of the signal segment contained in the resulting expected adoption signal is greater than or equal to the number S of segments of the sample dataiI.e. the number of segments of the signal segment to be concatenated may be greater than the number S of segments of sample data calculated in step a01iOr may be equal to the number S of sample data segments calculated in step a01i。
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A multiple frequency resolution analysis method for synchronous sampling of a rotating device, the multiple frequency resolution analysis method comprising:
a01: determining the sampling frequency resolution of each component to be monitored according to the fault characteristic frequency of each component to be monitored of a unit or a pump set to be tested, calculating the length of sampling data of each component to be monitored, and calculating the number of sampling data segments of each component to be monitored according to the length of the sampling data;
a02: after synchronously sampling the running state signals of the components to be monitored, continuously intercepting to obtain a signal segment with a preset sampling point number;
a03: connecting the signal segments of the preset sampling points according to the number of the sampling data segments to obtain an expected sampling signal of the sampling data length;
a04: calculating the actual frequency resolution of the running state signal of each component to be monitored, and performing spectrum analysis on the expected sampling signal according to the actual frequency resolution;
wherein the operation state signal comprises a vibration signal and a physical phase signal.
2. The multiple frequency resolution analysis method of claim 1, wherein the synchronously sampling the operating state signals of the components to be monitored comprises:
and synchronously sampling the running state signals of the components to be monitored according to a preset sampling frequency and a preset sampling point number.
3. The multiple frequency resolution analysis method of claim 1, wherein the number of segments of the signal segment included in the expected adoption signal is greater than or equal to the number of segments of the sample data.
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| CN104502099A (en) * | 2015-01-20 | 2015-04-08 | 中国人民解放军军事交通学院 | Cyclic frequency extraction method for characteristic components of transient conditions of gearbox |
| CN108731921A (en) * | 2017-12-26 | 2018-11-02 | 保定风赢新能源技术服务有限公司 | A kind of equipment connector fault monitoring method and system |
| CN109660258A (en) * | 2018-12-29 | 2019-04-19 | 四川双元智能科技有限公司 | A kind of method, apparatus and system of multichannel synchronousing collection difference sample frequency data |
| CN111649886A (en) * | 2019-03-04 | 2020-09-11 | 三菱重工业株式会社 | Abnormality detection device, rotating machine, abnormality detection method, and program |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502099A (en) * | 2015-01-20 | 2015-04-08 | 中国人民解放军军事交通学院 | Cyclic frequency extraction method for characteristic components of transient conditions of gearbox |
| CN108731921A (en) * | 2017-12-26 | 2018-11-02 | 保定风赢新能源技术服务有限公司 | A kind of equipment connector fault monitoring method and system |
| CN109660258A (en) * | 2018-12-29 | 2019-04-19 | 四川双元智能科技有限公司 | A kind of method, apparatus and system of multichannel synchronousing collection difference sample frequency data |
| CN111649886A (en) * | 2019-03-04 | 2020-09-11 | 三菱重工业株式会社 | Abnormality detection device, rotating machine, abnormality detection method, and program |
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Denomination of invention: A Multifrequency Resolution Analysis Method for Synchronous Sampling of Rotating Equipment Effective date of registration: 20230719 Granted publication date: 20210917 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN SHENGLILAI MONITORING TECHNOLOGY Co.,Ltd. Registration number: Y2023210000179 |