CN115396461B - Trigger type vibration data acquisition system suitable for low-speed variable working conditions - Google Patents
Trigger type vibration data acquisition system suitable for low-speed variable working conditions Download PDFInfo
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Abstract
The invention belongs to the technical field of mechanical vibration data acquisition, and discloses a trigger type vibration data acquisition system suitable for low-speed variable working conditions, which comprises the following components: a data acquisition module; the data acquisition module acquires a rotating speed judging working condition to control the power supply of the acquisition card, and performs trigger control with working condition acquisition and working condition classification vibration data acquisition of low-speed variable working conditions; the data acquisition module comprises: the DAM control unit and the data acquisition card. According to the invention, the DAM module and the switching power supply are introduced, the rotation speed is collected by the DAM module to judge the working condition to control the power supply of the collection card, the trigger control with the working condition collection is realized, the trigger flow is reduced, the collection sensitivity is improved, and the data collection efficiency is ensured. According to the invention, the reliability of vibration data acquisition is considered, and the soft start maintenance is carried out on the acquisition system by combining with a daily timing maintenance strategy, so that the working reliability of the DAM module and the acquisition card is ensured.
Description
Technical Field
The invention belongs to the technical field of mechanical vibration data acquisition, and particularly relates to a trigger type vibration data acquisition system suitable for low-speed variable working conditions.
Background
At present, the promotion of intelligent factories and intelligent mines makes intelligent management and maintenance of equipment more important. Many devices used in the fields of steelworks, wind power, mines and the like work in low-speed variable working conditions, and a certain amount of useful vibration data must be obtained first to realize the faults and operation and maintenance of the devices. However, the inherent characteristics of the device itself determine that the acquisition frequency of the vibration sensing perception cannot be too low, and the low speed requires a significant amount of vibration data that must be available for a certain length of time to perform device fault diagnosis.
In the prior art 1 (patent number CN 202011338400.5), a system and a method for monitoring equipment vibration acquisition are proposed, which adopt two modes of continuous vibration and trigger vibration acquisition, but the continuous vibration acquisition has the problems of excessive shutdown data, too large data volume and the like, while the IO trigger vibration acquisition causes a program to wait all the time, and has the problems of high memory occupation and difficult maintenance. The prior art 2 (patent number CN 202011186572.5) proposes a ship edge intelligent data acquisition module based on a time sequence database, which adopts a three-layer architecture of a hardware and equipment interface layer, a data management layer and a user application layer to construct a time-taking type periodic acquisition mode. However, the problem that the working condition of the collected vibration data is unstable and most of the machine halt data exists in the time sampling mode collection, and finally the quality of the vibration data cannot meet the requirement of fault diagnosis.
Through the above analysis, the problems and defects existing in the prior art are as follows: the reliability of low-speed vibration data acquired by the existing vibration data acquisition technology is low, the effective vibration data volume is low in proportion, and the online diagnosis data volume is too large to popularize.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a trigger type vibration data acquisition system applicable to low-speed variable working conditions.
The invention is realized in such a way that the trigger type vibration data acquisition system suitable for the low-speed variable working condition comprises:
The data acquisition module is connected with the sensor monitoring module and the Ethernet communication module and is used for acquiring a rotating speed judging working condition to control the power supply of the acquisition card and carrying out triggering control with working condition acquisition and working condition classification vibration data acquisition with low-speed variable working condition;
The data acquisition module comprises:
The DAM control unit is used for receiving the speed signal monitored by the speed sensor and transmitting the speed signal to the main control board in a current mode through the Ethernet communication module; the data acquisition module is used for receiving a data acquisition instruction transmitted by the main control board through the Ethernet communication module and controlling the switch of the data acquisition card based on the received data acquisition instruction;
the data acquisition card is used for receiving the signals of the vibration sensor, acquiring vibration data and transmitting the data to the main control board through the Ethernet communication module.
Further, the trigger vibration data acquisition system applicable to the low-speed variable working condition further comprises:
The sensor monitoring module is connected with the data acquisition module and is used for respectively monitoring the rotating speed and the vibration signal of the machine by utilizing the speed sensor and the vibration sensor and transmitting the signals obtained by monitoring to the data acquisition module;
The Ethernet communication module is connected with the data acquisition module and the data analysis and processing module and is used for converting the short-distance twisted pair electrical signals into optical signals suitable for long-distance transmission by using an Ethernet communication shared bus type local area network through an optical fiber transceiver to carry out data transmission and command transmission of the data acquisition module and the data analysis and processing module;
The data analysis and processing module is connected with the Ethernet communication module and is used for receiving signals and data transmitted by the data acquisition module by using the main control board and analyzing and storing the received signal data; and the main control board is used for issuing a data acquisition instruction to the data acquisition module through the Ethernet communication module according to the low-speed variable working condition acquisition strategy.
Further, the Ethernet communication shared bus type local area network is an Ethernet real-time communication channel of a remote control platform, a network relay and a data acquisition instrument;
the Ethernet real-time communication channel of the remote control platform, the network relay and the data acquisition instrument is constructed by an Ethernet switch.
Another object of the present invention is to provide a triggered vibration data collection method applicable to a low-speed variable working condition of the triggered vibration data collection system applicable to a low-speed variable working condition, where the triggered vibration data collection method applicable to a low-speed variable working condition includes:
step one, respectively monitoring the rotating speed and vibration signals of the machine by using a speed sensor and a vibration sensor; converting the monitored rotating speed signal into a current signal by utilizing a conditioning circuit;
Step two, the DAM receives the converted current signal and transmits the current signal to a main control board by using an Ethernet communication shared bus type local area network;
step three, the main control board receives the current signal and analyzes the current signal to determine the current working condition of the machine;
And step four, the main control board performs data acquisition of the corresponding working conditions of the machine according to the data acquisition instruction sent by the machine under the current working conditions.
Further, in the first step, monitoring the vibration signal of the machine with the vibration sensor includes: the monitoring of the vibration signal is performed in three directions of the machine X, Y, Z by means of three vibration sensors, respectively.
Further, in the third step, the main control board receives the current signal and analyzes the current signal, and determining the current working condition of the machine includes:
1) The main control board compares the current time of the system with a preset timing maintenance time T set; if the current time of the system is greater than the timing maintenance time T set, restarting the system by delay to enter maintenance; otherwise, turning to the step 2);
2) And (3) signal receiving judgment:
if the signal is stable, the main control board delays for m seconds to receive the signal again, and signal receiving judgment is carried out again;
If the signal change generates fluctuation, turning to the step 3);
3) The main control board determines the type of mechanical working conditions by using the following steps:
Wherein W c represents the working condition classification; i represents a working condition class; n i represents the rotation speed under the working condition i; x i represents the maximum rotational speed of the condition i; x 1 represents the maximum rotational speed of condition 1;
The maximum rotation speed calculation formula of the working condition 1 is as follows:
X1＝30f1/π；
Wherein f 1 represents the frequency conversion corresponding to the fault feature of the component with the lowest frequency perceived by the sensor.
Further, in the fourth step, the main control board performs data acquisition of the corresponding working condition of the machine according to the data acquisition instruction sent by the current working condition of the machine, including:
when the current working condition of the machine is working condition 1, data acquisition is not performed;
When the current working condition of the machine is the working condition 2-i, the main control board calculates the sampling frequency f i of the set working condition i by using an acquisition frequency calculation formula, and determines the time T i,q required by the data acquisition of the working condition i by using an acquisition data calculation formula; and controlling the acquisition card to acquire data based on the acquired frequency and the acquired data quantity obtained by calculation; meanwhile, the main control board judges whether the acquired data are valid, and if the acquired data are valid, the main control board performs the resident of the acquired data; deleting the collected invalid data if the data is invalid;
the acquisition frequency calculation formula is as follows:
fi≥10fg；
wherein f g denotes a mechanical component natural frequency;
The calculation formula of the acquired data volume is as follows:
Ti,q≥10×kq/fi,f；
Wherein f i,f represents the minimum failure characteristic frequency of the mechanical component under the working condition i; k q represents a data redundancy coefficient, and k q≥5;Ti,q represents time required for data acquisition under the working condition i.
Another object of the present invention is to provide a computer device, the computer device including a memory and a processor, the memory storing a computer program, the computer program when executed by the processor, causing the processor to execute the triggered vibration data collection method applicable to low-speed variable working conditions, including the steps of:
step one, respectively monitoring the rotating speed and vibration signals of the machine by using a speed sensor and a vibration sensor; converting the monitored rotating speed signal into a current signal by utilizing a conditioning circuit;
Step two, the DAM receives the converted current signal and transmits the current signal to a main control board by using an Ethernet communication shared bus type local area network;
step three, the main control board receives the current signal and analyzes the current signal to determine the current working condition of the machine;
And step four, the main control board performs data acquisition of the corresponding working conditions of the machine according to the data acquisition instruction sent by the machine under the current working conditions.
Another object of the present invention is to provide a computer readable storage medium storing a computer program, which when executed by a processor, causes the processor to execute the triggered vibration data collection method applicable to the low-speed variable working condition, including the steps of:
step one, respectively monitoring the rotating speed and vibration signals of the machine by using a speed sensor and a vibration sensor; converting the monitored rotating speed signal into a current signal by utilizing a conditioning circuit;
Step two, the DAM receives the converted current signal and transmits the current signal to a main control board by using an Ethernet communication shared bus type local area network;
step three, the main control board receives the current signal and analyzes the current signal to determine the current working condition of the machine;
And step four, the main control board performs data acquisition of the corresponding working conditions of the machine according to the data acquisition instruction sent by the machine under the current working conditions.
The invention further aims to provide an information data processing terminal which is characterized in that the information data processing terminal is used for realizing the trigger type vibration data acquisition system applicable to low-speed variable working conditions.
In combination with the above technical solution and the technical problems to be solved, please analyze the following aspects to provide the following advantages and positive effects:
First, aiming at the technical problems in the prior art and the difficulty in solving the problems, the technical problems solved by the technical proposal of the invention are analyzed in detail and deeply by tightly combining the technical proposal to be protected, the results and data in the research and development process, and the like, and some technical effects brought after the problems are solved have creative technical effects. The specific description is as follows:
According to the invention, the DAM module and the switching power supply are introduced, the rotation speed is collected by the DAM module to judge the working condition to control the power supply of the collection card, the trigger control with the working condition collection is realized, the trigger flow is reduced, the collection sensitivity is improved, and the data collection efficiency is ensured.
According to the invention, the reliability of vibration data acquisition is considered, and the soft start maintenance is carried out on the acquisition system by combining with a daily timing maintenance strategy, so that the working reliability of the DAM module and the acquisition card is ensured.
The invention has the advantages that the time is less on the basis of ensuring the frequency resolution ratio of the effective data quantity for realizing diagnosis under different working conditions, the effective data collection is finished, namely, the work is stopped, the system is more energy-saving, the low memory occupancy rate is lower, and the expansion application capability is stronger in the low-speed working condition vibration online diagnosis system.
Secondly, the technical scheme is regarded as a whole or from the perspective of products, and the technical scheme to be protected has the following technical effects and advantages:
The invention provides the selection basis of sampling frequencies of different working conditions and the effective data volume confirmation method for realizing diagnosis of different working conditions on the basis of dividing working conditions by combining the operation conditions of the sensor and the equipment and guaranteeing the frequency resolution, constructs the strategy of energy saving and low memory occupation rate for completing effective data collection, namely stopping working, and has strong expansion application capability in a low-speed working condition vibration online diagnosis system.
The invention maintains the timing, and the correction of the low-speed acquisition system is more reliable. The invention adopts remote control, and is more convenient to maintain.
Thirdly, as inventive supplementary evidence of the claims of the present invention, the following important aspects are also presented:
(1) The expected benefits and commercial values after the technical scheme of the invention is converted are as follows:
the technology solves the problems that the reliability of low-speed vibration data acquired by a vibration data acquisition technology is low, the effective vibration data volume is low in proportion, the technology support can be provided for on-line diagnosis of large-scale variable working condition equipment, the realization of autonomous maintenance of the equipment is promoted, and the intelligent and unmanned process of the equipment is promoted.
(2) The technical scheme of the invention fills the technical blank in the domestic and foreign industries:
The technology adopts the DAM module to collect the rotational speed to judge the method that the working condition controls the power supply of the acquisition card, can realize the triggering control with working condition collection, the triggering process is short, the sensitivity and the efficiency of the collection are high, the effective data quantity of the diagnosis realized by different working conditions is less in time on the basis of guaranteeing the frequency resolution, the system is more energy-saving, the memory occupancy is lower, and the expansion application capability is stronger in the low-speed working condition vibration on-line diagnosis system.
Drawings
FIG. 1 is a diagram of a triggered vibration data acquisition system architecture for low speed variable operating conditions provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a triggered vibration data collection method applicable to low-speed variable working conditions provided by an embodiment of the invention;
FIG. 3 is a flowchart of a triggered vibration data collection method applicable to low-speed variable working conditions provided by an embodiment of the invention;
FIG. 4 is a first-level operating mode workflow provided by an embodiment of the present invention;
FIG. 5 is a class i operating mode workflow provided by an embodiment of the present invention;
fig. 6 is a hardware layout diagram of a vibration data acquisition device for a JTP-1.2x1.2p hoisting winch, which is suitable for yellow mud depression mining groups and is provided by the embodiment of the invention.
Fig. 7 is a diagram of an application embodiment of a low-speed variable-working-condition triggered vibration data acquisition system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
1. The embodiments are explained. In order to fully understand how the invention may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.
As shown in fig. 1, the low-speed variable working condition triggered vibration data acquisition system provided by the embodiment of the invention is divided into: the system comprises a sensor monitoring module, a data acquisition module, an Ethernet communication module and a data analysis and processing unit.
(1) Sensor monitoring module: the speed sensor and the vibration sensor are used for respectively monitoring the rotating speed and the vibration signal of the machine, and transmitting the signals to the data acquisition module, so that the accuracy of vibration data is ensured, and three vibration sensors are used for monitoring in three directions of the machine X, Y, Z.
(2) And a data acquisition module: the intelligent speed control system comprises a DAM control unit and a data acquisition card, wherein the DAM control unit receives a speed signal monitored by a speed sensor, transmits the speed signal to a main control board in a current form through an Ethernet communication module, and receives an instruction transmitted by the main control board to control the switch of the data acquisition card; the data acquisition card receives signals of the vibration sensor, acquires vibration data and transmits the data to the main control board through the Ethernet communication module.
(3) An Ethernet communication module: the data acquisition module and the data analysis and processing unit are respectively connected, and data transmission and command transmission work at two ends are accepted, so that signals and data sent by the data acquisition module are transmitted to the main control board, and commands sent by the main control board are transmitted to the data acquisition module.
(4) A data analysis and processing unit: the method mainly receives signals and data transmitted by the data acquisition module, analyzes and stores the signals and the data, and sends out an acquisition work command to the data acquisition module.
As shown in fig. 2 to 3, the triggered vibration data acquisition method applicable to the low-speed variable working condition provided by the embodiment of the invention includes:
s101, respectively monitoring the rotating speed and vibration signals of the machine by using a speed sensor and a vibration sensor; converting the monitored rotating speed signal into a current signal by utilizing a conditioning circuit;
S102, the DAM receives the converted current signal and transmits the current signal to a main control board by using an Ethernet communication shared bus type local area network;
S103, the main control board receives the current signal and analyzes the current signal to determine the current working condition of the machine;
S104, the main control board performs data acquisition of the corresponding working conditions of the machine according to the data acquisition instruction sent by the current working conditions of the machine.
The low-speed variable working condition acquisition strategy provided by the embodiment of the invention is as follows:
The working conditions of the low-speed equipment are divided by combining the operation conditions of the sensor and the equipment, and the working conditions of the low-speed equipment are specifically as follows:
Wherein W c is working condition classification; i is a working condition class; n i is the rotation speed under the working condition i; x i is the maximum rotation speed of the working condition i; x 1 is the maximum rotation speed of the working condition 1, namely, when the minimum frequency which can be distinguished by the sensor is equal to the minimum characteristic frequency of the equipment, the rotation speed of the equipment is determined by the following formula:
X1＝30f1/π(r/min) (2)
Wherein f 1 is the frequency conversion corresponding to the fault feature of the component with the lowest frequency sensed by the sensor.
Because the rotating speed of the equipment is lower than X 1, namely, in the working condition 1, the sensor cannot sense useful vibration data, and the acquisition card in the working condition 1 does not acquire the useful vibration data.
In the working condition 2-i, in order to ensure the usefulness of collecting vibration data, the collection frequency is selected according to the following formula:
fi≥10fg (3)
Where f g is the natural frequency of the device component.
In order to ensure effective data, reduce the memory occupation, improve the acquisition efficiency and the applicability of large-scale online diagnosis, ensure the resolution of acquisition frequency, and the acquired data volume is determined according to the following formula:
Ti,q≥10×kq/fi,f,(4)
Where f i,f is the minimum failure characteristic frequency of the component under the working condition i, k q is the data redundancy coefficient, and k q≥5,Ti,q is the time s required for data acquisition under the working condition i.
The flow of the triggering vibration data acquisition method suitable for the low-speed variable working condition provided by the embodiment of the invention is set as follows:
(1) General workflow
The system sets a timing maintenance time T set. The magnetic induction speed sensor monitors the mechanical rotation speed, converts the mechanical rotation speed into a current signal through the conditioning circuit and transmits the current signal to the DAM module, the DAM module transmits the signal to the main control board through the Ethernet communication module, and the main control board compares the current time of the system with the timing maintenance time T set. If the current time is greater than T set, restarting the system to enter maintenance in a delayed mode, otherwise, judging signal reception, and if the signal is stable, indicating that the machine is running at the moment, enabling the main control board to receive the signal again in a delayed mode for m seconds; if the signal change generates fluctuation, the main control board judges working conditions according to the formula (1), calculates the sampling frequency f i of the set working conditions i according to the formula (3), and determines the time T i,q required by the data acquisition of the working conditions i according to the formula (4). After the working condition grade is judged, the corresponding working condition flow is entered for data acquisition, the acquired data is transmitted to the main control board, the main control board judges whether the data is valid or not, the data is stored in the storage unit if the data is valid, and the data is deleted if the data is invalid. The overall operational flow diagram is shown in fig. 2.
(2) First-level working condition work flow
When the main control board judges the primary working condition, the primary working condition acquisition flow is entered, the mechanical rotation speed is low, the vibration is tiny and negligible, the main control board does not send an acquisition instruction, the DAM does not trigger the acquisition card control switch, the acquisition card does not work, and the primary working condition work flow is shown in figure 4.
(3) Two-to-i-level working condition workflow
The main control board judges the current working condition grade i according to the formula (1), calculates the sampling frequency f i of the working condition i according to the formula (3), and determines the time T i,q required by the data acquisition of the working condition i according to the formula (4). The main control board sends an instruction to the DAM module through a network to control DAM switch action, so that the acquisition card is powered on, and the acquisition card setting parameter f i is sent to the acquisition card after T y (generally, the T y setting time is not less than 20 ms). The acquisition card acquires vibration data of the i working condition equipment through the vibration sensor at the frequency of f i, the acquired vibration data are transmitted to the main control board, and the main control board records the acquisition time T i at the same time. And when T i≥Ti,q, the acquisition card completes the acquisition of the working condition data within the set time, and the acquisition of the working condition i can be stopped. When T i<Ti,q, the main control board judges the collected data, the data is continuously and effectively stored in the storage unit, and the data is not intermittently and directly deleted.
2. Application example. In order to prove the inventive and technical value of the technical solution of the present invention, this section is an application example on specific products or related technologies of the claim technical solution.
In the application case, the overall hardware arrangement of the low-speed variable working condition triggering type vibration data acquisition is shown in fig. 6, and the vibration data acquisition of JTP-1.2x1.2P hoisting winch is used by a mining group under yellow mud depression, the hoisting machine works intermittently, and the maximum rotating speed is 47r/min. The system is used for collecting vibration data required by online fault diagnosis of a low-rotation-speed bearing, a gear and the like by combining cloud platform processing, the collection efficiency is higher, the data transmission quantity is greatly reduced, the system is more convenient to expand, the 3 winches are deployed in the mine by utilizing the technology, and the example application is shown in figure 7.
The switch power supply 1 is connected with the switch and is used for independently supplying power to the switch; the DAM module is connected with the switching power supply 2 and can control a switch, and the switching power supply 2 is connected with the data acquisition card; an adapter connects the network transceiver and the DAM module. The switch is respectively connected with the DAM module, the data acquisition card and the network transceiver. The vibration sensor is connected with the data acquisition card, and the speed sensor is connected with the DAM module.
The low-speed variable working condition triggering type vibration data acquisition system provided by the embodiment of the invention is applied to acquire vibration data of the hoisting winch with the highest rotating speed of 47r/min in a certain factory. The rotation speed of the equipment is monitored in real time through the DAM module, and under the condition that the equipment does not work, the acquisition card is in a closed state, so that real-time data acquisition is not needed, vibration-free acquisition is realized, and the occupied amount of the memory is reduced. The DAM module directly controls the switch to start to trigger the acquisition card to work, reduces the triggering process, improves the sensitivity of acquisition, simultaneously acquires the speed and vibration by the DAM module and the acquisition card, and ensures the efficiency of data acquisition. The system is classified according to the rotating speed of the machine, and the data acquisition speed is selected according to the class of the working condition, so that the accuracy of data acquisition is improved. The time for obtaining vibration data required by fault diagnosis of the low-speed bearing is not more than 2 hours and 30 minutes at most, and the collection efficiency and reliability are higher compared with continuous collection and time period round robin.
It should be noted that the embodiments of the present invention can be realized in hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The device of the present invention and its modules may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principle of the present invention as those skilled in the art will readily fall within the scope of the present invention.
Claims (9)
1. The utility model provides a trigger formula vibration data acquisition system suitable for low-speed change operating mode which characterized in that, trigger formula vibration data acquisition system suitable for low-speed change operating mode includes:
The data acquisition module is connected with the sensor monitoring module and the Ethernet communication module and is used for acquiring a rotating speed judging working condition to control the power supply of the acquisition card and carrying out triggering control with working condition acquisition and working condition classification vibration data acquisition with low-speed variable working condition;
The data acquisition module comprises:
The DAM control unit is used for receiving the speed signal monitored by the speed sensor and transmitting the speed signal to the main control board in a current mode through the Ethernet communication module; the data acquisition module is used for receiving a data acquisition instruction transmitted by the main control board through the Ethernet communication module and controlling the switch of the data acquisition card based on the received data acquisition instruction;
the data acquisition card is used for receiving the signals of the vibration sensor, acquiring vibration data and transmitting the data to the main control board through the Ethernet communication module;
The trigger type vibration data acquisition system suitable for the low-speed variable working condition further comprises:
The sensor monitoring module is connected with the data acquisition module and is used for respectively monitoring the rotating speed and the vibration signal of the machine by utilizing the speed sensor and the vibration sensor and transmitting the signals obtained by monitoring to the data acquisition module;
The Ethernet communication module is connected with the data acquisition module and the data analysis and processing module and is used for converting the short-distance twisted pair electrical signals into optical signals suitable for long-distance transmission by using an Ethernet communication shared bus type local area network through an optical fiber transceiver to carry out data transmission and command transmission of the data acquisition module and the data analysis and processing module;
The data analysis and processing module is connected with the Ethernet communication module and is used for receiving signals and data transmitted by the data acquisition module by using the main control board and analyzing and storing the received signal data; and the main control board is used for issuing a data acquisition instruction to the data acquisition module through the Ethernet communication module according to the low-speed variable working condition acquisition strategy.
2. The triggered vibration data collection system applicable to low-speed variable working conditions as claimed in claim 1, wherein the Ethernet communication shared bus type local area network is an Ethernet real-time communication channel of a remote control platform, a network relay and a data collection instrument;
the Ethernet real-time communication channel of the remote control platform, the network relay and the data acquisition instrument is constructed by an Ethernet switch.
3. A method for acquiring the triggered vibration data applicable to the low-speed variable working condition, which is applied to the triggered vibration data acquisition system applicable to the low-speed variable working condition according to any one of claims 1 to 2, and is characterized in that the triggered vibration data acquisition method applicable to the low-speed variable working condition comprises the following steps:
step one, respectively monitoring the rotating speed and vibration signals of the machine by using a speed sensor and a vibration sensor; converting the monitored rotating speed signal into a current signal by utilizing a conditioning circuit;
Step two, the DAM receives the converted current signal and transmits the current signal to a main control board by using an Ethernet communication shared bus type local area network;
step three, the main control board receives the current signal and analyzes the current signal to determine the current working condition of the machine;
And step four, the main control board performs data acquisition of the corresponding working conditions of the machine according to the data acquisition instruction sent by the machine under the current working conditions.
4. A method for triggered vibration data collection adapted for low-speed variable operating conditions as claimed in claim 3 wherein in step one, monitoring vibration signals of the machine with the vibration sensor comprises: the monitoring of the vibration signal is performed in three directions of the machine X, Y, Z by means of three vibration sensors, respectively.
5. The method for collecting triggered vibration data applicable to low-speed variable working conditions as claimed in claim 3, wherein in the third step, the main control board receives the current signal and analyzes the current signal, and determining the current working condition of the machine comprises:
1) The main control board compares the current time of the system with a preset timing maintenance time T set; if the current time of the system is greater than the timing maintenance time T set, restarting the system by delay to enter maintenance; otherwise, turning to the step 2);
2) And (3) signal receiving judgment:
if the signal is stable, the main control board delays for m seconds to receive the signal again, and signal receiving judgment is carried out again;
If the signal change generates fluctuation, turning to the step 3);
3) The main control board determines the type of mechanical working conditions by using the following steps:
Wherein W c represents the working condition classification; i represents a working condition class; n i represents the rotation speed under the working condition i; x i represents the maximum rotational speed of the condition i; x 1 represents the maximum rotational speed of condition 1;
The maximum rotation speed calculation formula of the working condition 1 is as follows:
X1＝30f1/π；
Wherein f 1 represents the frequency conversion corresponding to the fault feature of the component with the lowest frequency perceived by the sensor.
6. The method for collecting triggered vibration data applicable to low-speed variable working conditions as claimed in claim 3, wherein in the fourth step, the main control board performs mechanical corresponding working condition data collection according to a data collection instruction sent by the current working condition of the machine, including:
when the current working condition of the machine is working condition 1, data acquisition is not performed;
When the current working condition of the machine is the working condition 2-i, the main control board calculates the sampling frequency f i of the set working condition i by using an acquisition frequency calculation formula, and determines the time T i,q required by the data acquisition of the working condition i by using an acquisition data calculation formula; and controlling the acquisition card to acquire data based on the acquired frequency and the acquired data quantity obtained by calculation; meanwhile, the main control board judges whether the acquired data are valid, and if the acquired data are valid, the main control board performs the resident of the acquired data; deleting the collected invalid data if the data is invalid;
the acquisition frequency calculation formula is as follows:
fi≥10fg；
wherein f g denotes a mechanical component natural frequency;
The calculation formula of the acquired data volume is as follows:
Ti,q≥10×kq/fi,f；
Wherein f i,f represents the minimum failure characteristic frequency of the mechanical component under the working condition i; k q represents a data redundancy coefficient, and k q≥5;Ti,q represents time required for data acquisition under the working condition i.
7. A computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the triggered vibration data collection method of any one of claims 3-6 for low speed variable operating conditions.
8. A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the triggered vibration data collection method of any one of claims 3-6 adapted for low speed variable operating conditions.
9. An information data processing terminal, characterized in that the information data processing terminal is used for realizing the triggered vibration data acquisition system applicable to low-speed variable working conditions according to any one of claims 1-2.
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