CN110849461B - Phase modulator vibration signal acquisition and storage method and system - Google Patents
Phase modulator vibration signal acquisition and storage method and system Download PDFInfo
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
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Abstract
The invention discloses a phase modulator vibration signal acquisition and storage method, which comprises the following steps: collecting vibration signals, and converting the vibration signals into corresponding electric signals from physical signals; pre-processing the converted electrical signals; converting the preprocessed electric signals into corresponding digital signals; the vibration signal converted into the digital signal is transmitted to a cache region by adopting a one-way transmission technology and then transmitted to a lower computer; and driving the lower computer to screen out the data which accord with the preset screening rule according to the characteristics of the vibration signal for storage. The invention reasonably sets the data length, judges whether the data needs to be stored according to the equipment state variation as the characteristic quantity, realizes the storage and access requirements for supporting various structured and unstructured data and linearly increased mass real-time data, can realize the real-time calculation of high-speed sensing data flow for large-scale real-time sensing data, and lays a good foundation for establishing a phase modulator on-line monitoring and fault diagnosis system.
Description
Technical Field
The invention relates to the technical field of phase modulator fault detection, in particular to a phase modulator vibration signal acquisition and storage method and system.
Background
As a reactive compensation device, the phase modulator has the advantages of high tracking speed, wide compensation range, low failure rate and the like, and can effectively support the voltage of a power grid and improve the stability of the power grid. Its main function is performed by the rotating parts of which the rotor is the most important. The main characteristic of the fault of the rotating equipment is that the machine is accompanied by abnormal vibration and noise, and the vibration signal reflects the fault information of the machine from the amplitude, the frequency domain and the time domain. Due to the complexity of unit equipment, the particularity of the operating environment and the uncertainty of factors influencing vibration in installation and maintenance, various vibration faults are easy to generate, and the vibration state of the unit needs to be monitored in real time.
Mass real-time data storage, calculation and analysis technology is a big factor limiting the development of the on-line monitoring technology of equipment. The monitoring system of the phase modulation machine set needs to collect a large amount of data in real time, wherein the data comprise the operation state data of all positions of the rotating equipment. The existence of large measurement points and the characteristics of data intensive collection determine the storage of mass data and the requirement of high-speed calculation. The data volume of the high-speed large data stream is huge, the generation speed is very fast, in the current data processing technology, aiming at the processing of the high-speed data stream with large data volume, the single-point memory computing or stream computing technology is basically utilized, the response speed and the processing capacity of the technology cannot meet the requirements of practical application, and complex data with extremely high real-time requirements are difficult to analyze under a large concurrent environment. The real-time computation of the high-speed sensing data stream is realized aiming at large-scale real-time sensing data by designing a stream computation method and a parallel processing mechanism which accord with the characteristics of the power data stream.
Disclosure of Invention
The invention aims to provide a method and a system for acquiring and storing vibration signals of a phase modulator, which aim at the problems of large data processing scale, poor real-time performance and the like in a fault diagnosis system of a phase modulator unit, realize the storage and temperature release requirements of supporting various structured and unstructured data and linearly increased mass real-time data by reasonably setting the data length and judging whether the data needs to be stored or not according to the characteristic quantity of equipment state variation, can realize the real-time calculation of high-speed sensing data flow for large-scale real-time sensing data, and lay a good foundation for establishing an online monitoring and fault diagnosis system of the phase modulator.
To achieve the above object, with reference to fig. 1, the present invention provides a method for acquiring and storing a vibration signal of a phase modulator, where the method includes:
s1: the method comprises the steps that an eddy current sensor, a speed sensor and an acceleration sensor which are installed on a bearing seat of a unit collect vibration signals, and the vibration signals are converted into corresponding electric signals from physical signals;
s2: pre-processing the converted electrical signals;
s3: converting the preprocessed electric signals into corresponding digital signals;
s4: the vibration signal converted into the digital signal is transmitted to a cache region by adopting a one-way transmission technology and then transmitted to a lower computer;
s5: and driving the lower computer to screen out the data which accord with the preset screening rule according to the characteristics of the vibration signal for storage:
s51: judging whether the change amplitude of the current vibration signal is larger than a set amplitude threshold value or not relative to the signal stored last time, if so, generating a data storage instruction, and entering step S52, otherwise, ignoring the current acquisition signal and entering step S1;
s52: according to time-frequency characteristics, simplifying vibration data storage, multiplying all vibration data by a parameter M, and converting floating point data into integer data;
s53: arranging the vibration data in a descending order, and selecting the first N data;
s54: intercepting part of waveforms from the selected repeated waveforms in the first N data for storage;
s55: and establishing a data file with a set length for storage so as to balance the reading and writing speed.
In a further embodiment, in step S3, the step of converting the preprocessed electrical signal into a corresponding digital signal is to convert the preprocessed electrical signal into a corresponding digital signal by using a MAX1308 digital-to-analog converter.
In a further embodiment, the set amplitude threshold is 4%.
In a further embodiment, in step S54, the intercepting and storing a part of waveforms from the selected repeated waveforms in the first N data refers to,
and intercepting and storing half of the waveform.
In a further embodiment, in step S2, the preprocessing includes filtering and blocking.
In a further embodiment, the collecting and storing method further includes:
s6: and data exchange between the data acquisition layer and the data processing layer is realized by adopting an OPC UA interface technology through a private line network.
In a further embodiment, in step S6, the implementing, by using the OPC UA interface technology through the private line network, data exchange between the data acquisition layer and the data processing layer includes:
setting an OPC UA server and an OPC UA client, wherein:
the OPC UA server is used for realizing the collection and encapsulation of data of bottom equipment and storing historical data in an additional database, so that one or more clients can acquire the data of different bottom equipment in a uniform manner;
the OPC UA client is used for searching and connecting the OPC UA server, browsing the address space of the OPC UA server, reading the real-time data stored in the address space, and displaying the real-time or historical data to a user in a chart form through a client display interface.
Based on the phase modulator vibration signal acquisition and storage method, the invention also provides a phase modulator vibration signal acquisition and storage system, wherein the acquisition and storage system comprises a data acquisition layer, a data processing layer and a message server;
the data acquisition layer comprises a signal measurement unit and an acquisition server and is used for acquiring and sending data of the electrical equipment of the phase modulation machine to the data processing layer, and the data processing layer comprises a power station monitoring center and a database server and is used for collecting the data of the electrical equipment of the phase modulation machine collected by each data acquisition layer and sending the data to an upper application server;
the signal measurement unit, the acquisition server, the power station monitoring center and the database server are all connected with the message server, and the transmission and the reception of messages among the signal measurement unit, the acquisition server, the power station monitoring center and the database server are completed through the forwarding function of the message server, wherein the signal measurement unit, the acquisition server, the power station monitoring center and the database server are abstracted into independent communication nodes, and data transmission is performed by adopting a distributed message middleware;
the signal measuring unit comprises an eddy current sensor, a speed sensor and an acceleration sensor which are arranged on a bearing seat of the unit and is used for collecting vibration signals, converting the vibration signals into corresponding electric signals from physical signals and sending the electric signals to a collecting server;
the acquisition server is used for preprocessing the vibration signals, converting the vibration signals into corresponding digital signals, transmitting the digital signals to a cache region by adopting a one-way transmission technology, and then transmitting the digital signals to a power station monitoring center;
the power station monitoring center screens out data which accord with preset screening rules according to the characteristics of the vibration signals and sends the data to the database server;
the database server comprises a real-time database and a relational database; the real-time database is used for storing original performance data sent by the data acquisition layer, and the original performance data comprises eddy current sensor signals, speed sensor signals and acceleration sensor signals, and the relational database is used for storing basic information and analyzed effective data of the phase modifier electrical equipment.
In a further embodiment, the valid data includes user rights, resource data, and various types of statistical summary data.
Compared with the prior art, the technical scheme of the invention has the following remarkable beneficial effects:
(1) by reasonably setting the data length and judging whether the data needs to be stored or not according to the equipment state variation serving as the characteristic quantity, the storage and access requirements of supporting various structured untwining and unstructured data and linearly increasing mass real-time data are met, the real-time calculation of high-speed sensing data flow can be realized for large-scale real-time sensing data, and a good foundation is laid for establishing a phase modulator on-line monitoring and fault diagnosis system.
(2) The signal transmission part adopts a low-bandwidth high-frequency unit data real-time one-way transmission technology suitable for the DCS system, solves the technical problem of DCS data acquisition under different types of unit equipment and different control system brands, and realizes the quick real-time refreshing of DCS data.
(3) According to the relevant technical standards and specifications, a distributed cluster file system is built by utilizing a distributed data warehouse technology, the resource utilization rate of a server and a storage system is greatly improved, and the system construction cost is reduced.
(4) The big data of the relational database is selected to be in a distributed storage mode (HDFS, HBASE), so that the real-time property of the real-time storage of the acquired data can be enhanced, and the system performance is improved; meanwhile, useful real-time data can be processed in time and stored in a historical data table by utilizing the import of the Oracle data in idle time, so that the calling of various programs of an application layer is facilitated.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of a phase modulator vibration signal acquisition and storage method of the present invention.
Fig. 2 is a general design diagram of phase modulator vibration signal acquisition and storage of the present invention.
FIG. 3 is a functional block diagram of the sensor signal preprocessing of the present invention.
Fig. 4 is a block diagram of a phase modulator vibration signal acquisition and storage system of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Detailed description of the preferred embodiment
With reference to fig. 1 and fig. 2, the present invention provides a method for acquiring and storing a vibration signal of a phase modulator, where the method includes:
s1: the vibration signals are collected through an eddy current sensor, a speed sensor and an acceleration sensor which are installed on a bearing seat of the unit, and the vibration signals are converted into corresponding electric signals through physical signals.
S2: the conversion into an electrical signal is pre-processed. Preferably, the pre-treatment comprises performing filtering, blocking, and the like. Fig. 3 is a functional block diagram of one type of sensor signal preprocessing.
S3: and converting the preprocessed electric signals into corresponding digital signals. Preferably, a MAX1308 digital-to-analog converter is used to convert the preprocessed electrical signals into corresponding digital signals.
S4: and the vibration signal converted into the digital signal is transmitted to a buffer area by adopting a one-way transmission technology and then transmitted to a lower computer.
S5: and driving the lower computer to screen out the data which accord with the preset screening rule according to the characteristics of the vibration signal for storage:
s51: and judging whether the change amplitude of the current vibration signal is larger than a set amplitude threshold (for example, 4%) relative to the signal stored last time, if so, generating a data storage instruction, and entering step S52, otherwise, ignoring the current acquisition signal, and entering step S1.
S52: and simplifying vibration data storage according to time-frequency characteristics, multiplying all vibration data by a parameter M, and converting floating point data into integer data.
S53: and arranging the vibration data in a descending order, and selecting the first N data.
S54: and intercepting and storing part of the waveforms in the selected repeated waveforms in the first N data, for example, intercepting and storing half of the waveforms or other arbitrary part waveforms capable of reflecting waveform characteristics.
S55: and establishing a data file with a set length for storage so as to balance the reading and writing speed.
The phase modulator vibration signal acquisition and storage method is mainly used for signal acquisition and storage of a phase modulator rotating part, and therefore a sensor is mounted on a bearing seat of a unit so as to acquire the most accurate vibration signal conveniently. The data acquisition layer acquires vibration acceleration original signals generated by vibration through the front-end sensor, the signals are transmitted to the data processing layer through a single-phase transmission technology, and the data acquired by the data acquisition layer are stored in the real-time database and the relational database after being processed in a unified time scale, description and classification mode so as to be used for follow-up inquiry and calling.
In some examples, the acquisition and storage method further comprises:
s6: and data exchange between the data acquisition layer and the data processing layer is realized by adopting an OPC UA interface technology through a private line network. The set OPC UA server and the set OPC UA client have the following characteristics:
the OPC UA server is used for realizing the collection and encapsulation of data of bottom layer equipment and storing historical data in an additional database, so that one or more clients can acquire the data of different bottom layer equipment in a uniform mode.
The OPC UA client is used for searching and connecting the OPC UA server, browsing the address space of the OPC UA server, reading the real-time data stored in the address space, and displaying the real-time or historical data to a user in a chart form through a client display interface.
With reference to fig. 4, based on the aforementioned acquisition and storage method, the present invention further provides a phase modulator vibration signal acquisition and storage system, where the acquisition and storage system includes a data acquisition layer, a data processing layer, and a message server.
The data acquisition layer comprises a signal measurement unit and an acquisition server and is used for acquiring and sending the data of the phase modulation machine electrical equipment to the data processing layer, and the data processing layer comprises a power station monitoring center and a database server and is used for collecting the phase modulation machine electrical equipment data collected by each data acquisition layer and sending the data to an upper application server.
The signal measurement unit, the acquisition server, the power station monitoring center and the database server are all connected with the message server, and the transmission and the reception of messages among the signal measurement unit, the acquisition server, the power station monitoring center and the database server are completed through the forwarding function of the message server, wherein the signal measurement unit, the acquisition server, the power station monitoring center and the database server are abstracted to be independent communication nodes, and data transmission is performed by adopting a distributed message middleware.
The signal measurement unit comprises an eddy current sensor, a speed sensor and an acceleration sensor which are arranged on a bearing seat of the unit and used for collecting vibration signals, converting the vibration signals into corresponding electric signals through physical signals and sending the electric signals to a collection server.
The acquisition server is used for preprocessing the vibration signals, converting the vibration signals into corresponding digital signals, and transmitting the digital signals to a cache region by adopting a one-way transmission technology and then transmitting the digital signals to a power station monitoring center.
And the power station monitoring center screens out data which accord with preset screening rules according to the characteristics of the vibration signals and sends the data to the database server.
The database server comprises a real-time database and a relational database; the real-time database is used for storing original performance data sent by the data acquisition layer, and the original performance data comprises eddy current sensor signals, speed sensor signals and acceleration sensor signals, and the relational database is used for storing basic information and analyzed effective data of the phase modifier electrical equipment. Preferably, the valid data includes user rights, resource data, and various statistical summary data.
Preferably, the database server mainly stores the data acquired by the data acquisition layer in the real-time database and the relational database after unified time scale, description and classification processing.
The data acquisition and storage system of the phase modulation unit can be divided into two parts, namely a data acquisition layer (signal acquisition module) and a data processing layer (signal storage module). The signal acquisition module comprises a signal measurement unit and an acquisition server and is responsible for acquiring data of the electrical equipment of the synchronous phase modulator and transmitting the data to the power station monitoring center. The signal storage module comprises a power station monitoring center and a database server and is responsible for collecting performance data collected by each signal acquisition module, and sending the performance data to the application server and the data server for upper-layer application.
The data acquisition layer (signal acquisition module) comprises two functions of signal measurement and signal transmission. The signal measuring section is capable of measuring, recording and storing the vibration acceleration raw signals of the respective measuring electrodes. The signal transmission part adopts a low-bandwidth high-frequency unit data real-time one-way transmission technology suitable for the DCS system, solves the technical problem of DCS data acquisition under different types of unit equipment and different control system brands, and realizes the quick real-time refreshing of DCS data.
The data processing layer (signal storage module) adopts a stream calculation method and a parallel processing mechanism to construct a reliable, safe and linearly expanded big data platform, unified management is realized, the safe sharing of data resources is realized, and an information display mode is expanded; according to the relevant technical standards and specifications, a distributed cluster file system is built by utilizing a distributed data warehouse technology, the resource utilization rate of a server and a storage system is greatly improved, and the system construction cost is reduced.
A power station monitoring center, each signal measuring unit, an acquisition server, an application server and a database server in a data acquisition and storage system of a phase modulation unit are abstracted into independent communication nodes, and Distributed Control System (DCS) message middleware is adopted for data transmission. Each application program is connected together by using the communication nodes to form a complete message communication network, and the sending and receiving of messages are completed through the forwarding function of the message server.
Detailed description of the invention
The invention provides a phase modulator vibration signal acquisition and storage system which comprises a data acquisition layer (a signal acquisition module), a data processing layer (a signal storage module) and a message server.
Signal acquisition module
The module is a bridge connected with a phase modulator body device by a computer and is a basis for diagnosing vibration faults of the phase modulator.
In the data acquisition system, vibration signals are subjected to signal conversion through eddy current, speed and acceleration sensors arranged on a bearing seat of the unit, and the converted signals are sent to a signal preprocessing board for processing such as filtering, blocking and the like. And then, converting the preprocessed data into digital signals by adopting an MAX1308 digital-to-analog converter, and conveying the digital signals to a cache area or even a lower computer by adopting a one-way transmission technology.
Meanwhile, when the lower computer receives data, the useful data can be reasonably stored according to the characteristics of the vibration signals, as shown in fig. 3. Firstly, simplifying vibration data storage according to time-frequency characteristics, and multiplying all vibration data by 10 so as to convert floating point data into integers; due to the repeatability of the waveform, only half of the waveform can be stored; and most of the vibration data is zero or close to zero, only the first 30 data with larger vibration may be stored. Then, the read-write speed is balanced, and a data file with a proper length is established. And meanwhile, data storage is carried out according to the change of the equipment state, and when the change of the sensor is more than 4%, a data storage instruction is sent out.
When the lower computer transmits signals to the upper computer, data exchange between the data acquisition layer and the data processing layer is realized by adopting an OPC UA interface technology through a private line network not lower than 5M. The OPC UA server is mainly used to collect and package data of the bottom layer devices, and store history data in an additional database, so that one or more clients can acquire data of different bottom layer devices in a unified manner. The main functions of the OPC UA client are searching and connecting the OPC UA server, browsing the address space of the server and reading the real-time data stored in the server, and displaying the real-time or historical data to workers in a chart form through a client display interface.
Two, signal storage module
The module is mainly used for storing data acquired by the data acquisition layer in a real-time database and a relational database after unified time scale, description and classification processing.
The real-time database adopts PI real-time database of OSI Soft company, and is responsible for storing original performance data transmitted by the signal acquisition module, including eddy current sensor signals, speed sensor signals and acceleration sensor models.
The relational database is selected as an Oracle company enterprise database and is responsible for storing basic information and analyzed effective data, such as user permission, resource data, various statistical summary data and the like. The big data is selected to be in a distributed storage mode (HDFS, HBASE), so that the real-time property of the real-time storage of the collected data can be enhanced, and the system performance is improved; meanwhile, useful real-time data can be processed in time and stored in a historical data table by utilizing the import of the Oracle data in idle time, so that the calling of various programs of an application layer is facilitated.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (7)
1. A phase modulator vibration signal acquisition and storage method is characterized by comprising the following steps:
s1: the method comprises the steps that an eddy current sensor, a speed sensor and an acceleration sensor which are installed on a bearing seat of a unit collect vibration signals, and the vibration signals are converted into corresponding electric signals from physical signals;
s2: pre-processing the converted electrical signals;
s3: converting the preprocessed electric signals into corresponding digital signals;
s4: the vibration signal converted into the digital signal is transmitted to a cache region by adopting a one-way transmission technology and then transmitted to a lower computer;
s5: and driving the lower computer to screen out the data which accord with the preset screening rule according to the characteristics of the vibration signal for storage:
s51: judging whether the change amplitude of the current vibration signal is larger than a set amplitude threshold value or not relative to the signal stored last time, if so, generating a data storage instruction, and entering step S52, otherwise, ignoring the current acquisition signal and entering step S1;
s52: according to time-frequency characteristics, simplifying vibration data storage, multiplying all vibration data by a parameter M, and converting floating point data into integer data;
s53: arranging the vibration data in a descending order, and selecting the first N data;
s54: intercepting part of waveforms from the selected repeated waveforms in the first N data for storage;
s55: and establishing a data file with a set length for storage so as to balance the reading and writing speed.
2. The phase modulation vibration signal collection and storage method according to claim 1, wherein in step S3, the step of converting the preprocessed electrical signals into corresponding digital signals is to,
the preprocessed electrical signals are converted into corresponding digital signals by a MAX1308 digital-to-analog converter.
3. A phase modulator vibration signal acquisition and storage method according to claim 1, wherein said set amplitude threshold is 4%.
4. The method for collecting and storing the vibration signal of the phase modulation machine according to claim 1, wherein in step S54, the step of intercepting and storing part of the waveforms of the repeated waveforms of the first N selected data refers to,
and intercepting and storing half of the waveform.
5. The phase modulation vibration signal collection and storage method according to claim 1, wherein in step S2, the preprocessing includes filtering and blocking.
6. A phase modulator vibration signal acquisition and storage method according to claim 1, wherein said acquisition and storage method further comprises:
s6: and data exchange between the data acquisition layer and the data processing layer is realized by adopting an OPCUA interface technology through a private line network.
7. The phase modulation vibration signal collection and storage method according to claim 6, wherein in step S6, the data exchange between the data collection layer and the data processing layer via the dedicated line network by using the opua interface technology comprises:
setting an OPCUA server and an OPCUA client, wherein:
the OPCUA server is used for realizing the collection and encapsulation of data of bottom layer equipment and storing historical data in an additional database, so that one or more clients can acquire data of different bottom layer equipment in a uniform mode;
the OPCUA client is used for searching and connecting the OPCUA server, browsing the address space of the OPCUA server and reading the real-time data stored in the address space, and displaying the real-time or historical data to a user in a chart form through a client display interface.
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