CN115898850B - Edge calculation processor of axial plunger pump - Google Patents
Edge calculation processor of axial plunger pump Download PDFInfo
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- CN115898850B CN115898850B CN202211405027.XA CN202211405027A CN115898850B CN 115898850 B CN115898850 B CN 115898850B CN 202211405027 A CN202211405027 A CN 202211405027A CN 115898850 B CN115898850 B CN 115898850B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 5
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- 238000012544 monitoring process Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention provides an edge calculation processor of an axial plunger pump, which is mainly applied to the field of intelligent hydraulic parts and aims at the axial plunger pump of a specific application object; the axial plunger pump edge computing processor consists of a sensor module, a digital-to-analog conversion module, a characteristic extraction module, a data transmission module and a peripheral accessory module. The sensor module is used for collecting analog signals of pressure, flow, vibration and temperature at a specific position of the axial plunger pump, the analog signals are converted into digital signals through the digital-to-analog conversion module and are input into the feature extraction module, the feature extraction module is used for carrying out edge calculation on the signals, extracting relevant feature information of time domains and frequency domains in the signals, and the feature information is transmitted to the upper computer or other calculation processing modules through the data transmission module so as to realize efficient transmission of the running state data of the axial plunger pump.
Description
Technical Field
The invention belongs to the field of intelligent hydraulic elements, and particularly relates to an edge calculation processor of an axial plunger pump.
Background
In hydraulic systems, the hydraulic pump as a core power element profoundly influences the operation of the whole system, and the axial plunger pump is one of the most widely used. The axial plunger pump has the advantages of high pressure, compact structure, high efficiency and the like, but the operation state of the axial plunger pump is often required to be checked because the axial plunger pump has a complex internal structure and a severe working environment and is easy to fail in the operation process. With the development of the hydraulic industry towards the direction of Internet of things, informatization and intelligence, the traditional manual inspection mode is difficult to meet the requirements, and various cloud state monitoring technologies for the axial plunger pump are emerging. The cloud state monitoring technology can realize remote real-time monitoring of the axial plunger pump, ensures normal and safe operation of the axial plunger pump, is limited by the transmission rate and bandwidth of the existing cloud communication technology, and is difficult to realize low-cost real-time transmission of a large amount of sensor data related to the operation state of the axial plunger pump, so that the development of the cloud state monitoring technology for the axial plunger pump is greatly limited.
Disclosure of Invention
In order to solve the problem of the cloud state monitoring technology of the axial plunger pump, the invention provides an edge computing processor of the axial plunger pump.
The edge computing processor of the axial plunger pump comprises a sensor module, a digital-to-analog conversion module, a feature extraction module and a data transmission module.
The sensor module is a sensor group arranged at a specific position of the axial plunger pump and used for collecting operation data of the axial plunger pump;
the digital-to-analog conversion module is used for converting the analog signals acquired by the sensor group into digital signals and transmitting the digital signals to the feature extraction module;
the characteristic extraction module is used for carrying out time domain characteristic extraction, time-frequency domain conversion and frequency domain characteristic extraction calculation on the received digital signals to obtain characteristic information, and transmitting the characteristic information to the data transmission module;
the data transmission module is an SPI protocol interface and is used for outputting the characteristic information calculated by the characteristic extraction module.
Further, the sensor group comprises pressure, flow, vibration and temperature sensors; the pressure sensor is arranged at the inlet and the outlet of the axial plunger pump, the flow sensor is arranged at the inlet and the outlet of the axial plunger pump, the temperature sensor is arranged inside the axial plunger pump housing and outside the cylinder body, and the vibration sensor is arranged inside the axial plunger pump housing and outside the cylinder body.
Further, the digital-to-analog conversion module is an AD7606 chip and is provided with eight input channels.
Furthermore, the feature extraction module is an STM32H743 chip, and can modify software programs facing different application scenes.
Further, the system also comprises an accessory module and an expansion interface.
The auxiliary module comprises a processor power supply circuit, a program burning debugging interface and a data storage chip;
the processor power supply circuit is used for supplying power to the edge computing processor;
the program burning and debugging interface is used for burning and debugging programs;
the data storage chip is used for expanding the storage space.
Furthermore, the expansion interface comprises a CAN interface and an RS485 interface and is mainly used for realizing the communication between the feature extraction module and the upper computer.
The expansion interface also comprises an ADC interface which is used for an additional sensor signal input interface when the digital-to-analog conversion module cannot meet the input requirement of the sensor.
Further, the characteristic information comprises six time domain characteristic quantities, namely square root amplitude, root mean square amplitude, kurtosis value, kurtosis factor and margin factor, which are obtained by processing the sensor signal; average frequency, 4-2 th order Fang Genzhi, 2 nd order weight, 2 nd order center distance square root, 4 th order convolution index, 1/2 th order convolution index.
The invention has at least one of the following beneficial effects:
(1) The invention applies the edge computing algorithm featuring feature extraction to the state monitoring of the axial plunger pump for the first time. In the invention, the characteristic extraction process is placed at the edge side close to the equipment, the signal acquisition and the characteristic extraction process can be synchronously carried out, and finally, only necessary sensor information and characteristic information are uploaded, so that the transmission of a large amount of invalid information is reduced, the cost of data transmission is reduced, and the efficiency and the effect of monitoring the state of the axial plunger pump are improved.
(2) The sensor is scientific in type, quantity selection and arrangement mode; the operating state of the axial plunger pump can be examined from various aspects of energy pulsation, wear, load and the like.
(3) The characteristic information of the invention is selected by comprehensively considering, and the running state index of the axial plunger pump can be effectively reflected. The characteristic information is selected to give consideration to performance indexes in the time domain and the frequency domain, and the energy characteristic, the impact information, the main frequency distribution state in the frequency domain and the energy convolution characteristic of the axial plunger pump can be reflected respectively.
(4) The invention has strong expansibility and flexibility. The input aspect is provided with more than 8 synchronous acquisition interfaces of the sensor, so that the signal acquisition requirement of the multichannel sensor can be met; the SPI, RS485 and CAN communication interfaces are covered in the output aspect, and the requirements of near, middle and long-distance data transmission on quick and medium speed CAN be met; in addition, a programmable STM32H743 chip is adopted, and software programs can be flexibly modified to meet requirements for different application scenes.
Drawings
The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the inventive embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
FIG. 1 shows a schematic diagram of an edge calculation processor of an axial plunger pump of the present invention;
fig. 2 shows a flow chart of the axial plunger pump edge calculation processor hardware program of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in FIG. 1, the structure of the invention comprises a sensor module, a digital-to-analog conversion module, a feature extraction module, a data transmission module, an accessory module and an expansion interface. The analog signals of the running state of the axial plunger pump are acquired by the sensor module and enter the edge computing processor, digital signals are obtained through digital-to-analog conversion module processing, then the digital signals are input into the feature extraction module for feature extraction to obtain feature information, and finally the feature information is transmitted to the data transmission module for output.
The sensor module is a sensor group arranged at a specific position of the axial plunger pump and is connected with an interface of the digital-to-analog conversion module. The sensor group comprises four types of sensors, namely pressure, flow, vibration and temperature, the number of the sensors is at least 8, the number of interfaces of the digital-to-analog conversion modules corresponds, one pressure sensor and one flow sensor form a group, the two groups are respectively arranged at the inlet and the outlet of the axial plunger pump, the vibration and the temperature sensors are also same, one vibration and one temperature sensor form a group, and the two groups are respectively arranged inside the axial plunger pump housing and outside the cylinder body. When the axial plunger pump is collected, the pressure and flow sensors check the energy pulsation condition of the axial plunger pump, the vibration sensor checks the abrasion condition of a structural member of the cylinder body, and the temperature sensor checks whether the axial plunger pump is overloaded or abnormally operated.
The digital-to-analog conversion module is an AD7606 chip, is provided with at least eight input channels and is connected with the sensor group and is used for converting analog signals acquired by the sensor group into digital signals and transmitting the digital signals to the feature extraction module. Before the sensor signals are input into the digital-to-analog conversion module, a corresponding voltage conversion module is arranged, so that the voltage of different sensor signals is limited within the rated input range of the digital-to-analog conversion module.
The feature extraction module is an STM32H743 chip, is connected with the digital-to-analog conversion module and the data transmission module, and is a main operation chip. The feature extraction module is used for receiving the digital signals from the digital-to-analog conversion module at regular time and equal length, wherein the receiving time interval is that the acquisition duration is T, and a plurality of channel digital signals acquired in the T time are respectively stored in the memory space of the embedded chip in an array form; then, calculating six time domain feature quantities of square root amplitude, root mean square amplitude, kurtosis value, kurtosis factor and margin factor of each array to obtain energy feature and impact information of the axial plunger pump on a time domain; then converting the digital signal in the time domain into the frequency domain by utilizing an FFT time-frequency domain conversion formula; calculating six frequency domain characteristic quantities of average frequency, 4-2 order Fang Genzhi, 2 order weight value, 2 order center distance square root value, 4 order convolution index and 1/2 order convolution index on the frequency domain to obtain main frequency distribution condition and spectrum energy convolution characteristic of the axial plunger pump on the frequency domain; the system must ensure that the above calculation is completed within the reception time interval; and finally, transmitting the characteristic information to a data transmission module.
The data transmission module is an SPI protocol interface and can be connected with an upper computer, other operation processing chips and the like, and the characteristic information obtained by calculation of the characteristic extraction module is externally output;
the edge computing processor is also provided with an accessory module, which comprises a power supply circuit for supplying power to the edge computing processor, a program burning and debugging interface for performing program burning and debugging on the edge computing processor, and a data storage chip for expanding the storage space of the edge computing processor;
the expansion interface comprises a CAN interface and an RS485 interface, is mainly used for realizing the communication between the feature extraction module and the upper computer, and also comprises an expansion ADC interface, which is used for an additional sensor signal input interface when the digital-to-analog conversion module cannot meet the input requirement of the sensor.
As shown in fig. 2, a hardware program workflow of the axial plunger pump edge calculation processor is as follows: firstly, starting an axial plunger pump edge computing processor, checking an input power supply, a working environment and the like, and then accessing the sensor, wherein the processor enters a standby state to wait for a sensor input signal; the axial plunger pump operates, the sensor collects signals and inputs the signals to a channel interface of the digital-to-analog conversion module, and if the input analog signals are not received at the channel interface, the process returns to the previous step to continue waiting; if the channel interface detects an input analog signal, the digital-to-analog conversion module is utilized to carry out digital-to-analog conversion on the input analog signal to obtain a digital signal, and the digital signal is input into the feature extraction module; the feature extraction module performs continuous access with the duration of T on the input digital signal, if the access time is longer than T, the next step is performed, and if the access time is not up, the steps of digital-to-analog conversion and input to the feature extraction module are repeated; after enough digital signals are obtained, carrying out feature extraction on the digital signals in the obtained time period T to obtain feature information; in order to ensure that feature extraction is successfully completed, a time interval with the duration of delta T is set, feature information is transmitted to a data transmission module only when the time after feature extraction is greater than or equal to delta T, and otherwise, feature extraction is waited for completion; and finally, the data transmission module transmits the characteristic information to the outside, a user can select whether to finish the characteristic extraction process, if not, the data transmission module returns to a link waiting for the sensor input signal to perform system work circulation, and if so, the whole program flow is terminated.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (4)
1. An axial plunger pump edge calculation processor which is characterized in that: the device comprises a sensor module, a digital-to-analog conversion module, a characteristic extraction module and a data transmission module;
the sensor module is a sensor group arranged at a specific position of the axial plunger pump and used for collecting operation data of the axial plunger pump;
the digital-to-analog conversion module is used for converting the analog signals acquired by the sensor group into digital signals and transmitting the digital signals to the feature extraction module;
the characteristic extraction module is used for carrying out time domain characteristic extraction, time-frequency domain conversion and frequency domain characteristic extraction calculation on the received digital signals to obtain characteristic information, and transmitting the characteristic information to the data transmission module;
the data transmission module is an SPI protocol interface and is used for outputting the characteristic information calculated by the characteristic extraction module;
the characteristic information comprises a time domain characteristic quantity and a frequency domain characteristic quantity which are obtained by processing the sensor signal;
the time domain characteristic quantity comprises square root amplitude, root mean square amplitude, kurtosis value, kurtosis factor and margin factor; the frequency domain characteristic quantity comprises average frequency, 4-2 steps Fang Genzhi, 2 steps weight value, 2 steps center distance square root value, 4 steps convolution index and 1/2 steps convolution index;
the system also comprises an accessory module and an expansion interface;
the auxiliary module comprises a processor power supply circuit, a program burning debugging interface and a data storage chip;
the processor power supply circuit is used for supplying power to the edge computing processor;
the program burning and debugging interface is used for burning and debugging programs;
the data storage chip is used for expanding the storage space;
the expansion interface comprises a CAN interface and an RS485 interface and is used for realizing the communication between the feature extraction module and the upper computer;
the sensor module comprises a pressure sensor, a flow sensor, a vibration sensor and a temperature sensor; the pressure sensor is arranged at the inlet and the outlet of the axial plunger pump, the flow sensor is arranged at the inlet and the outlet of the axial plunger pump, the temperature sensor is arranged inside the axial plunger pump housing and outside the cylinder body, and the vibration sensor is arranged inside the axial plunger pump housing and outside the cylinder body.
2. The edge computing processor of the axial plunger pump according to claim 1, wherein the digital-to-analog conversion module is an AD7606 chip and is provided with eight input channels.
3. The edge computing processor of the axial plunger pump according to claim 1, wherein the feature extraction module is an STM32H743 chip, and the software program can be modified for different application scenarios.
4. The edge computing processor of claim 1, wherein the expansion interface further comprises an ADC interface for additional sensor signal input interfaces when the digital-to-analog conversion module fails to meet the sensor input requirements.
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| CN202211405027.XA CN115898850B (en) | 2022-11-10 | 2022-11-10 | Edge calculation processor of axial plunger pump |
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| CN202211405027.XA CN115898850B (en) | 2022-11-10 | 2022-11-10 | Edge calculation processor of axial plunger pump |
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| CN115898850B true CN115898850B (en) | 2024-01-26 |
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| JP2019200174A (en) * | 2018-05-18 | 2019-11-21 | 株式会社日立製作所 | Rotary machine diagnostic system, information processing apparatus and rotary machine diagnostic method |
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