CN110750484A - Synchronous acquisition system and acquisition method for data of rotating speed and multiple vibration channels - Google Patents
Synchronous acquisition system and acquisition method for data of rotating speed and multiple vibration channels Download PDFInfo
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- CN110750484A CN110750484A CN201911007694.0A CN201911007694A CN110750484A CN 110750484 A CN110750484 A CN 110750484A CN 201911007694 A CN201911007694 A CN 201911007694A CN 110750484 A CN110750484 A CN 110750484A
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- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/16—Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/76—Architectures of general purpose stored program computers
- G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
- G06F15/7807—System on chip, i.e. computer system on a single chip; System in package, i.e. computer system on one or more chips in a single package
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Abstract
A synchronous acquisition system and acquisition method of rotating speed and multi-channel vibration channel data comprises an FPGA submodule, a DSP submodule and an ARM submodule; the FPGA submodule, the DSP submodule and the ARM submodule are connected in sequence; the FPGA submodule is used for parallel and synchronous acquisition of multiple vibration channels and rotating speeds; the DSP submodule is used for calculating a key phase time value of each acquisition according to a system clock; meanwhile, the vibration data is subjected to perfect filtering processing; calculating the number of vibration data points to be discarded according to the key phase time value of the rotating speed; and the ARM submodule is used for receiving the vibration and rotating speed data processed by the DSP and uploading the vibration and rotating speed data to the upper computer. By introducing the key phase time value for calculating each rotating speed pulse as reference, the key phase synchronism of vibration waveform acquisition is ensured; and a reliable data base is provided for fault diagnosis of subsequent industrial field devices.
Description
Technical Field
The invention belongs to the technical field of data acquisition, and particularly relates to a synchronous acquisition system and method for rotating speed and multi-channel vibration channel data.
Background
With the rapid development of the industrial internet, the industrial field detection technology is also rapidly applied; aiming at complex industrial field environments such as steel, cement, papermaking and the like, the vibration detection technology with high reliability, high precision and low time delay is provided.
Due to the characteristics of industrial fields such as steel, cement, paper making and the like, once unpredictable equipment halt or equipment maintenance is met, huge halt cost is brought; therefore, a sophisticated and reliable system for detecting vibration environment is needed.
The traditional industrial field vibration data and the rotating speed data are collected separately, and the vibration data collected for many times do not have a synchronization function, so that the effective order analysis of the vibration data is very unfavorable, and the damage degree and the phenomenon of industrial field equipment cannot be well analyzed.
Disclosure of Invention
The invention aims to provide a synchronous acquisition system and an acquisition method for data of a rotating speed and multiple vibration channels, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a synchronous acquisition system for rotating speed and multi-channel vibration channel data comprises an FPGA (field programmable gate array) submodule, a DSP (digital signal processor) submodule and an ARM submodule; the FPGA submodule, the DSP submodule and the ARM submodule are connected in sequence; the FPGA submodule is used for parallel and synchronous acquisition of multiple vibration channels and rotating speeds; the DSP submodule is used for calculating a key phase time value of each acquisition according to a system clock; meanwhile, filtering the vibration data; calculating the number of vibration data points to be discarded according to the key phase time value of the rotating speed; and the ARM submodule is used for receiving the vibration and rotating speed data processed by the DSP and uploading the vibration and rotating speed data to the upper computer.
Further, a synchronous acquisition system for data of rotation speed and multiple vibration channels based on claim 1, comprising the following steps:
step 1, capturing rotating speed pulses in an FPGA chip by adopting verilog HDL hardware description language, and simultaneously starting ADC sampling of 16 vibration channels in parallel according to effective rotating speed pulse falling edges;
step 2, after sampling is finished, the FPGA transmits the vibration data to the DSP through an mcasp interface;
step 3, after the DSP obtains the rotating speed pulse, the tick count of the rotating speed pulse and the system clock are calculated to obtain a key phase time value;
step 4, storing the key phase time value to a key phase synchronous register;
step 5, after the vibration data are acquired by the vibration acquisition thread and are subjected to filtering processing, reading a key phase time value; if the reading fails, namely the key phase time value is not stored, temporarily caching the frame vibration data; if the reading is successful, multiplying the key phase time value by the vibration sampling frequency, and calculating the number of points of the vibration data needing to be discarded;
step 6, starting from the key phase time value, judging the vibration data point number needing to be discarded and the cached data point number; if the number of points needing to be discarded is less than the number of the vibration points cached, subtracting the vibration data points needing to be discarded from the cached vibration data; then storing and uploading the vibration data; otherwise, continuing to keep the next vibration acquisition data until the cached data is larger than the data amount needing to be discarded, and then discarding;
and 7, during multiple continuous collection, calculating the number of points to be discarded according to the calculated key phase time point in each collection, and ensuring that the number of the subsequent vibration data points meets the synchronism of each collection.
Furthermore, lattice LFXP2-5E is selected as a vibration channel for parallel acquisition, and an FPGA chip is selected as a vibration channel for parallel acquisition; selecting an ADs 127424-bit high-precision AD conversion chip; OMAPL138 dual-core DSP + ARM is adopted as a processing unit of vibration and rotating speed data.
Further, in step 3, the current value of the key phase time is obtained by multiplying the value of the rpm pulse count by the value of each tick period.
Further, in step 5, after the threshold is obtained, if the sampling point of the currently stored vibration data is greater than or equal to the threshold, directly discarding the vibration data with the threshold; and if the number of the currently stored data points is smaller than the threshold value, continuously reading the vibration data from the FPGA until the number of the read vibration data points is larger than or equal to the number of the threshold value, and then discarding the vibration data points with the threshold value.
Compared with the prior art, the invention has the following technical effects:
the method aims at collecting vibration waveforms for multiple times and keeping key phase synchronization, and introduces the rotating speed as a calculation reference; the waveform of a multi-channel vibration channel keeps synchronism during multiple acquisition by using the rotating speed pulse as a starting acquisition reference signal, calculating a key phase time value of the rotating speed pulse and combining the parallel processing capacity of an FPGA chip; reliable data reference is provided for analyzing the order vibration data model of the industrial equipment in the industrial field. It has the following advantages:
firstly, the method comprises the following steps: the rotating speed pulse is introduced as a synchronous signal, and the synchronous starting and acquisition of 16 channels can be realized to the maximum extent by matching with the parallel processing capability of the FPGA chip.
Secondly, the method comprises the following steps: by introducing the key phase time value for calculating each rotating speed pulse as reference, the key phase synchronism of vibration waveform acquisition is ensured; and a reliable data base is provided for fault diagnosis of subsequent industrial field devices.
Drawings
FIG. 1 is a diagram of a DSP + ARM dual core and FPGA logic processing chip-based architecture according to the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 1 and 2, a synchronous data acquisition system for a rotating speed and multiple vibration channels includes an FPGA sub-module, a DSP sub-module, and an ARM sub-module; the FPGA submodule, the DSP submodule and the ARM submodule are connected in sequence; the FPGA submodule is used for parallel and synchronous acquisition of multiple vibration channels and rotating speeds; the DSP submodule is used for calculating a key phase time value of each acquisition according to a system clock; meanwhile, the vibration data is subjected to perfect filtering processing; calculating the number of vibration data points to be discarded according to the key phase time value of the rotating speed; and the ARM submodule is used for receiving the vibration and rotating speed data processed by the DSP and uploading the vibration and rotating speed data to the upper computer.
A collecting method of a synchronous collecting system of rotating speed and multi-channel vibration channel data comprises the following steps:
step 1, capturing rotating speed pulses in an FPGA chip by adopting verilog HDL hardware description language, and simultaneously starting ADC sampling of 16 vibration channels in parallel according to effective rotating speed pulse falling edges;
step 2, after sampling is finished, the FPGA transmits the vibration data to the DSP through an mcasp interface;
step 3, after the DSP obtains the rotating speed pulse, the tick count of the rotating speed pulse and the system clock are calculated to obtain a key phase time value;
step 4, storing the key phase time value to a key phase synchronous register;
step 5, after the vibration data are acquired by the vibration acquisition thread and are subjected to filtering processing, reading a key phase time value; if the reading fails, namely the key phase time value is not stored, temporarily storing the frame vibration data; if the reading is successful, multiplying the key phase time value by the vibration sampling frequency to calculate the number of vibration data points needing to be discarded;
step 6, from the key phase time value, discarding the previous vibration data, and storing and uploading the subsequent vibration data;
and 7, during multiple continuous collection, calculating the number of points to be discarded according to the calculated key phase time point in each collection, and ensuring that the number of the subsequent vibration data points meets the synchronism of each collection.
Selecting lattice LFXP2-5E as a vibration channel for parallel acquisition, and selecting an FPGA chip for parallel acquisition of the vibration channel; selecting an ADs 127424-bit high-precision AD conversion chip; OMAPL138 dual-core DSP + ARM is adopted as a processing unit of vibration and rotating speed data.
And step 3, multiplying the rotating speed pulse count value by each tick period value to obtain the current key phase time value.
In step 5, after the threshold value is obtained, if the sampling point of the currently stored vibration data is larger than or equal to the threshold value, directly discarding the vibration data with the threshold value; and if the number of the currently stored data points is smaller than the threshold value, continuously reading the vibration data from the FPGA until the number of the read vibration data points is larger than or equal to the number of the threshold value, and then discarding the vibration data points with the threshold value.
The invention relates to a multi-channel vibration synchronous acquisition system based on rotating speed pulses. Each part is concretely as follows;
FPGA module design
According to the functional division of the invention, the FPGA part mainly processes the parallel synchronous acquisition of a plurality of vibration channels and the capture processing of the rotating speed pulse.
The FPGA reads an acquisition starting command sent by the DSP through the EMA bus; simultaneously capturing signals of the rotating speed pulses; after the rotating speed pulse is filtered, the falling edge of the rotating speed pulse is captured
DSP + ARM dual-core processor module
The part is a core component of the invention and adopts an OMAPL138 dual-core processor module of TI company; the ARM processor is responsible for communication with the upper computer, issues a starting acquisition command, collects vibration and rotating speed pulse data processed by the DSP and uploads the vibration and rotating speed pulse data to the upper computer module.
Key phase synchronous processing module
The rotating speed pulse is used as a reference signal for key phase synchronization; firstly, filtering processing is carried out on an FPGA processing unit, and signals of rising edges and falling edges are obtained; at the position of a falling edge signal, the 16 paths of vibration channels synchronously start to collect; after the tachometer pulse is input to the DSP chip, the DSP chip calculates the key phase time value of each pulse (tick) according to the following formula (here exemplified by 150Mhz for the system clock):
key phase time value (count value of ecap capture register) time (1/150000000) s of each pulse
And storing the calculated key phase time value into a register. After the acquired vibration waveform data is subjected to filtering processing, judging whether a key phase time value exists or not; if the vibration data does not exist, storing the vibration data and continuously reading the data sampled next time; if the key phase time value exists, calculating the vibration acquisition points needing to be discarded by using the following formula:
LostPoints ═ key phase time value ═ sampling frequency.
Further, comparing the currently stored vibration points with the calculated lost points, and directly discarding sampling points needing to be discarded from the currently stored vibration points if the currently stored vibration points are more than or equal to the lost points; if the number of the vibration data points is less than the number of the lost points, continuously reading the vibration data points of the next sampling and continuously judging;
according to the design scheme of the DSP + ARM dual-core + FPGA logic processing chip, as shown in figure 1, by means of the parallel processing capacity of the FPGA, after an acquisition starting command issued by the DSP is received, when the falling edge of the effective rotating speed comes, AD vibration acquisition of a 16-channel is started at the same time, and a rotating speed signal is output to an eCAP (electronic program access processor) capturing pin of the DSP through the FPGA so that the DSP can acquire rotating speed pulses.
And after the DSP processor receives the interruption of the rotating speed pulse, reading the value in the pulse count tick in the eCAP register. And the rotating speed pulse counting value is circularly utilized to calculate the time point of the synchronous data of the vibration channel. When the calculated time point value meets the requirement, writing the value into a key phase synchronization register; so far, the function of synchronizing the rotating speed pulses is finished.
After the FPGA finishes collecting the vibration data, the DSP reads the vibration data in an EDMA interruption mode; after reading the vibration data, firstly judging whether the key phase synchronous register is rewritten, if not, keeping the current vibration data, and meanwhile continuing to wait for the key phase synchronous register of the rotating speed; until the numerical value of the key phase synchronous register of the rotating speed can be read, the number of vibration sampling points needing to be discarded is obtained by multiplying the key phase time value stored by the register and the current sampling frequency, and the corresponding number of the sampling points is discarded; and meanwhile, the discarded sampling data is stored to wait for uploading to an upper computer for analysis.
After the processing, the sampling starting points of the vibration data waveforms sampled each time can be kept consistent, and key phase synchronous acquisition is achieved; and reliable data support is provided for analyzing the operating condition of the industrial equipment by using the acquired vibration waveform.
Claims (5)
1. A synchronous acquisition system for rotating speed and multi-channel vibration channel data is characterized by comprising an FPGA (field programmable gate array) submodule, a DSP (digital signal processor) submodule and an ARM (advanced RISC machine) submodule; the FPGA submodule, the DSP submodule and the ARM submodule are connected in sequence; the FPGA submodule is used for parallel and synchronous acquisition of multiple vibration channels and rotating speeds; the DSP submodule is used for calculating a key phase time value of each acquisition according to a system clock; meanwhile, the vibration data is subjected to perfect filtering processing; calculating the number of vibration data points to be discarded according to the key phase time value of the rotating speed; and the ARM submodule is used for receiving the vibration and rotating speed data processed by the DSP and uploading the vibration and rotating speed data to the upper computer.
2. A method for acquiring a system for synchronously acquiring data of a rotating speed and multiple vibration channels is characterized in that the system for synchronously acquiring the data of the rotating speed and the multiple vibration channels based on claim 1 comprises the following steps:
step 1, capturing rotating speed pulses in an FPGA chip by adopting verilog HDL hardware description language, and simultaneously starting ADC sampling of 16 vibration channels in parallel according to effective rotating speed pulse falling edges;
step 2, after sampling is finished, the FPGA transmits the vibration data to the DSP through an mcasp interface;
step 3, after the DSP obtains the rotating speed pulse, the tick count of the rotating speed pulse and the system clock are calculated to obtain a key phase time value;
step 4, storing the key phase time value to a key phase synchronous register;
step 5, after the vibration data are acquired by the vibration acquisition thread and are subjected to filtering processing, reading a key phase time value; if the reading fails, namely the key phase time value is not stored, discarding the frame vibration data; if the reading is successful, multiplying the key phase time value by the vibration sampling frequency, and calculating the vibration data point number threshold value needing to be discarded;
step 6, from the key phase time value, discarding the previous vibration data, and storing and uploading the subsequent vibration data;
and 7, during multiple continuous collection, calculating the number of points to be discarded according to the calculated key phase time point in each collection, and ensuring that the number of the subsequent vibration data points meets the synchronism of each collection.
3. The method for synchronously acquiring data of a rotating speed and multiple vibration channels as claimed in claim 2, wherein a lattice LFXP2-5E is selected as a vibration channel for parallel acquisition, and an FPGA chip is selected as a vibration channel for parallel acquisition; selecting an ADs 127424-bit high-precision AD conversion chip; OMAPL138 dual-core DSP + ARM is adopted as a processing unit of vibration and rotating speed data.
4. The method as claimed in claim 2, wherein in step 3, the current key phase time value is obtained by multiplying the tachometer pulse count value by each tick period value.
5. The acquisition method of a synchronous acquisition system of the data of the rotating speed and the multiple vibration channels according to claim 2, wherein in the step 5, after the threshold value is obtained, if the sampling point of the currently stored vibration data is larger than or equal to the threshold value, the vibration data with the threshold value is directly discarded; and if the number of the currently stored data points is smaller than the threshold value, continuously reading the vibration data from the FPGA until the number of the read vibration data points is larger than or equal to the number of the threshold value, and then discarding the vibration data points with the threshold value.
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| CN111736517A (en) * | 2020-08-07 | 2020-10-02 | 成都谱信通科技有限公司 | Synchronous acquisition and processing card system based on multichannel ADC and FPGA |
| CN112305961A (en) * | 2020-10-19 | 2021-02-02 | 武汉大学 | Novel signal detection and acquisition equipment |
| CN112818283A (en) * | 2021-02-01 | 2021-05-18 | 国家电网有限公司 | Intelligent vibration protection method and device for hydroelectric generating set and electronic equipment |
| CN113390505A (en) * | 2021-08-17 | 2021-09-14 | 北京博华信智科技股份有限公司 | Vibration protection method and system for multi-channel synchronous acquisition |
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