CN113092043A - Method and system for acquiring vibration data of iron core looseness - Google Patents
Method and system for acquiring vibration data of iron core looseness Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention discloses a method and a system for collecting vibration data of iron core looseness, wherein diagnosis of iron core looseness in a transformer at present has certain defects, and during transmission, if a UDP transmission protocol is adopted, packet loss is easy to occur, and if a TCP/IP transmission protocol is adopted, transmission is stable, but the efficiency is low. The requirement for collecting vibration signals of loose iron cores is high, the integrity of the transmission process is also guaranteed while the efficiency is guaranteed, and the efficiency is not effectively improved in the prior art aiming at the condition that packet loss occurs in the transmission process of a UDP transmission protocol. The invention carries out numbering and sequencing on a plurality of data packets, transmits the data packets, the receiving end analyzes the header numbers of the data packets, judges whether the data packets are lost or not by analyzing the total number and the serial numbers of the data packets, and retransmits the data packets if the data packets are lost, thereby being beneficial to optimizing UDP transmission, ensuring the integrity of data transmission and considering the transmission efficiency.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of states of power transmission and transformation equipment, in particular to a method and a system for acquiring iron core loosening vibration data.
Background
The power transformer is a core device of a power grid and plays an important role in safe and stable operation of a power system. The core and the winding are key parts of the transformer, the fastening degree of the core and the winding is gradually reduced along with transportation, installation, running aging and short-circuit impact bearing, and even obvious core loosening and winding deformation can occur, which can cause great threat to the capability of the transformer for resisting the short-circuit impact and can cause further reduction of the insulation strength. The transformer fault analysis of the manufacturing enterprise and the national grid company in the year 2000-2012 shows that the proportion of the fault caused by the iron core loosening and the winding deformation in the total accident rate of the transformer is more than half.
The diagnosis of the loosening of the iron core in the transformer at present has certain defects, the requirement for collecting vibration data of the loosening of the iron core is high, if a TCP/IP transmission protocol is used, the stability is high, the data sequence can be ensured, but the efficiency is low; if a UDP transmission protocol is adopted, the efficiency is high during transmission, but the risk of packet loss is easy to occur, and in the prior art, aiming at the problem of packet loss of the UDP transmission protocol, a retransmission method is adopted, which is to analyze a plurality of data packets one by one to judge the lost data packet, find the lost data and retransmit the lost data, but the time consumed in the analysis process is too much, which is not favorable for the detection efficiency.
Disclosure of Invention
The technical problems to be solved by the invention are that the requirement on efficiency is high in the process of collecting vibration data by loosening an iron core, the efficiency of a TCP/IP transmission protocol is low, a UDP transmission protocol has the risk of packet loss, and the integrity and the transmission efficiency of data transmission cannot be considered at the same time.
The invention is realized by the following technical scheme:
a method for collecting vibration data of iron core looseness comprises the following steps:
s1: acquiring a mechanical vibration original signal;
s2: coupling the mechanical vibration original signal into a voltage signal;
s3: conditioning the voltage signal into a differential signal;
s4: performing analog-to-digital conversion on the differential signal to obtain a digital signal;
s5: dividing the digital signal into a plurality of data packets according to the sampling depth and the length of the data packets, and determining the total number of the data packets;
s6: numbering the data packets, sequencing the data packets according to the sequence of the numbering, and taking the numbering as a header of the data packets;
s7: transmitting the sequenced data packets;
s8: receiving the data packets, analyzing the header numbers of the data packets, analyzing the total number and the number of the data packets, and judging whether the data packets are lost or not according to the change of the total number and the sequence of the numbers;
s9: and if the data packet is lost, feeding back the lost data packet number, and retransmitting the data packet corresponding to the lost data packet number.
At present, the diagnosis of the looseness of the iron core in the transformer has certain defects, and during transmission, in order to ensure the transmission efficiency, a UDP transmission protocol is adopted, but the UDP transmission protocol has instability and is easy to generate the situation of packet loss, and if the TCP/IP transmission protocol is adopted, although the situation of packet loss can not occur during stable transmission, the efficiency is low. The requirement for collecting vibration signals of loose iron cores is high, the integrity of the transmission process is guaranteed while the efficiency is guaranteed, in the prior art, for the condition that packet loss occurs in the transmission process of a UDP transmission protocol, the identifiers of a plurality of data packets are analyzed one by one, the data with the packet loss is found and then retransmitted, and although no packet loss occurs in the transmission process, the efficiency is not effectively improved. The invention numbers and sorts a plurality of data packets for transmission, a receiving end analyzes the header numbers of the data packets, judges whether the data packets are lost or not by analyzing the total number and the serial numbers of the data packets, and retransmits the data packets if the data packets are lost, thereby solving the problems of risk of packet loss and low efficiency caused by collecting vibration data for iron core looseness by using a UDP transmission protocol.
Preferably, the S9 includes the following sub-steps:
s11: feeding the lost data packet number back to a data sending end through a TCP/IP transmission protocol;
s12: and the data sending end retransmits the data packet corresponding to the lost data packet number through a UDP transmission protocol according to the fed back lost data packet number.
The invention only uses the TCP/IP transmission protocol for feedback when dropping the packet, and most of the transmission uses the UDP transmission protocol, because the number of dropped packets is small, if the UDP transmission protocol is used for feedback, the risk of dropping the packet exists, the TCP/IP transmission protocol can be used for transmission, the transmission stability is high, the data can completely reach the data sending end, and the efficiency in the transmission process is optimized.
Preferably, the sampling depth and the length of each data packet are fixed.
The invention sets fixed values in the sampling depth and the length of each data packet to determine the total amount of the data packets, and can compare the total amount of the data packets with the total amount of the data packets to judge whether the data packets are lost or not when the data packets are transmitted.
On the other hand, the invention also adopts an iron core loosening vibration data acquisition system which comprises a signal coupling unit, a signal conditioning unit, a signal acquisition unit, a system control unit, a wireless communication unit and a power supply unit;
the signal coupling unit: the device comprises a circuit board, a signal processing circuit and a signal processing circuit, wherein the circuit board is used for coupling a mechanical vibration original signal of equipment into a voltage signal;
the signal conditioning unit: for conditioning the voltage signal into a differential signal;
the signal acquisition unit: the differential signal processing circuit is used for carrying out analog-to-digital conversion on the differential signal to obtain a digital signal;
the wireless communication unit: sending the digital signal to a receiving end through a UDP customized data transmission protocol;
the system control unit: for controlling the transmission of the wireless communication unit, controlling the sampling rate and sampling depth of the analog-to-digital conversion;
the power supply unit: and the power management module is used for managing the power supplies of the signal coupling unit, the signal conditioning unit, the signal acquisition unit, the system control unit and the wireless communication unit.
Preferably, the UDP customized data transmission protocol includes a quantity unit, an identification unit, a sorting unit, a header unit, a sending unit, an analysis unit, a determination unit, and a retransmission unit;
number unit: the device comprises a sampling unit, a data acquisition unit, a data processing unit and a data processing unit, wherein the sampling unit is used for sampling a digital signal;
an identification unit: the number is used for numbering the data packets;
a sorting unit: the data packet processing device is used for sequencing the data packets according to the serial number sequence;
a gauge head unit: the number is used as the header of the data packet;
a transmission unit: the data packet processing device is used for sending the sequenced data packets;
an analysis unit: the header numbers are used for analyzing the data packets;
a judging unit: the device is used for analyzing the total number and the serial number of the data packets and judging whether the data packet is lost or not according to the change of the total number and the serial number of the data packets;
a retransmission unit: for retransmission of lost packets.
Preferably, the retransmission unit includes a feedback unit and a transmission unit;
a feedback unit: the data transmitting terminal is used for feeding back the lost data packet number to the data transmitting terminal through a TCP/IP transmission protocol;
a transmission unit: and the data packet corresponding to the lost data packet number is retransmitted through a UDP transmission protocol.
Preferably, the power supply unit includes a constant current source power supply circuit for supplying a constant current to the signal coupling unit.
Preferably, the power supply unit further comprises a system power management circuit and an under-voltage battery alarm circuit;
the system power management circuit: for providing different levels of voltage;
the battery under-voltage alarm circuit comprises: for performing state detection on the battery voltage.
Preferably, the system power management circuit comprises an LDO chip and a DC/DC chip.
Preferably, the signal coupling unit comprises a vibration sensor and socket J1, a resistor R12; the signal conditioning unit comprises a capacitor C10, a resistor R10 and a differential amplifier, and a signal end of the socket J1 is used for leading out the voltage signal generated by the vibration sensor and leading into a constant current output end A point of the constant current source power supply circuit to the vibration sensor; the signal end, the capacitor C10 and the resistor R10 are sequentially connected in series, and the other end of the resistor R10 is connected with the reverse input end of the differential amplifier; the positive input end of the differential amplifier is connected with the reference module and grounded; the output end A point of the constant current source power supply circuit is connected with the signal end, one end of the resistor R12 is connected with one end of the signal end, and the other end of the resistor R12 is grounded.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. and the UDP transmission is optimized, the integrity of data transmission is ensured, and the transmission efficiency is considered.
2. The communication in the wireless network is more reliable and stable, and the risk of packet loss in UDP transmission is avoided.
3. The field detection efficiency can be greatly improved.
4. The signal-to-noise ratio of the circuit is remarkably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of vibration data transmission method steps;
FIG. 2 is a schematic diagram of a vibration data acquisition architecture;
FIG. 3 is a circuit diagram of a constant current source power supply;
FIG. 4 is a circuit diagram of an under-voltage alarm;
fig. 5 is a diagram of a differential amplifier circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, a method for collecting vibration data of loose iron core includes the steps of: s1: acquiring a mechanical vibration original signal; s2: the signal coupling unit couples the mechanical vibration original signal into a voltage signal; s3: conditioning the voltage signal into a differential signal through a differential amplifier; s4: performing analog-to-digital conversion on the differential signal to obtain a digital signal; s5: dividing the digital signal into a plurality of data packets according to the sampling depth and the length of the data packets, and determining the number of the data packets; s6: sequentially numbering a plurality of data packets from 1 in an increasing manner, sequencing the data packets according to the sequence of the numbering, and taking the numbering as a header of the data packets; s7: transmitting the sequenced data packets to a receiving end; s8: the receiving end receives a plurality of data packets, analyzes the serial numbers of the data packets, analyzes the total number and the serial numbers of the data packets, and judges whether the data packet is lost or not according to the change of the total number of the data packets and the sequence of the serial numbers; s9: if the data packet is lost, the lost data packet number and the data of the number corresponding to the data packet are fed back to the control chip through a TCP/IP protocol, and the control chip retransmits the data packet corresponding to the lost data packet number through a UDP transmission protocol; the receiving end sets the sampling depth and the length of each data packet, and the sampling depth and the length of each data packet are fixed and unchanged.
In the prior art, for the situation of packet loss in the transmission process of a UDP transmission protocol, identifiers of a plurality of data packets are analyzed one by one, and data with packet loss is found and then retransmitted. The invention numbers and sorts a plurality of data packets for transmission, a receiving end analyzes the header numbers of the data packets, judges whether the data packets are lost or not by analyzing the total number and the serial numbers of the data packets, and retransmits the data packets if the data packets are lost, thereby solving the problems of risk of packet loss and low efficiency caused by collecting vibration data for iron core looseness by using a UDP transmission protocol.
A vibration data acquisition system for iron core looseness is shown in figure 2 and comprises a signal coupling unit, a signal conditioning unit, a signal acquisition unit, a system control unit, a wireless communication unit and a power supply unit; the power supply unit is internally provided with a rechargeable battery and is responsible for power management of the signal coupling unit, the signal conditioning unit, the signal acquisition unit, the system control unit and the wireless communication unit; the signal coupling unit couples the mechanical vibration original signal of the equipment into a voltage signal; the signal conditioning unit is used for conditioning the voltage signal into a differential signal so as to reduce the interference of common-mode noise and improve the anti-interference capability; the signal acquisition unit is used for performing analog-to-digital conversion to obtain a digital signal; a system control unit: the system comprises a wireless communication unit, a sampling unit and a control unit, wherein the wireless communication unit is used for controlling transmission and controlling the acquisition rate and sampling depth of analog-to-digital conversion; the wireless communication unit: the system is used for sending digital signals to a receiving end by adopting a UDP customized data transmission protocol to realize wireless signal transmission;
the UDP customized data transmission protocol comprises a quantity unit, an identification unit, a sequencing unit, a header unit, a sending unit, an analysis unit, a judgment unit and a retransmission unit; number unit: the device is used for dividing the digital signal into a plurality of data packets according to the sampling depth and the length of the data packets, and determining the number of the data packets; an identification unit: used for numbering a plurality of data packets; a sorting unit: the data packet sorting device is used for sorting a plurality of data packets according to the serial number sequence; a gauge head unit: a header for taking the number as a packet; a transmission unit: the data transmission device is used for transmitting a plurality of sequenced data packets according to a UDP transmission protocol; an analysis unit: the header number is used for the receiving end to analyze the data packet; a judging unit: the device is used for analyzing the total number and the serial number of the data packets and judging whether the data are lost or not according to the change of the total number and the serial number of the data packets; a retransmission unit: for retransmission of lost packets. Assuming that 100 data packets are divided into 100 data packets according to the set sampling depth and the set data packet length, numbering the 100 data packets from 1 in an incremental manner, wherein the total number of the data packets is from 1 to 100, and when the data packets are transmitted through UDP, if the received data packets are 100 and equal to the total number of the data packets, the transmission is finished; if only 95 data packets arrive at the receiving end and the total number is not equal, the 5 lost data packet numbers are found, the lost data packet numbers are fed back to the data sending end through a TCP/IP transmission protocol, and the data sending end transmits the data packets corresponding to the lost data packet numbers again through a UDP transmission protocol.
The invention only uses the TCP/IP transmission protocol for feedback when dropping the packet, and most of the transmission uses the UDP transmission protocol, because the number of dropped packets is small, if the UDP transmission protocol is used for feedback, the risk of dropping the packet exists, the TCP/IP transmission protocol can be used for transmission, the transmission stability is high, the data can completely reach the data sending end, and the efficiency in the transmission process is optimized.
The retransmission unit comprises a feedback unit and a transmission unit; a feedback unit: the system is used for transmitting the lost data packet number through a TCP/IP protocol; a transmission unit: and the method is used for retransmitting the lost data packet number and the data packet corresponding to the data packet number through a UDP transmission protocol.
The wireless intelligent vibration sensor adopts a lithium battery for energy supply, and is provided with a constant current power supply unit, a power supply management unit and the like. The system comprises a constant current source power supply circuit, a system power supply management circuit and a battery under-voltage alarm circuit; constant current source supply circuit: providing a stable current of 1 muA-10 mA, providing a constant current of 2-10 mA range for the coupling unit of the wireless intelligent vibration sensor, and setting the output end of the constant current source power supply circuit as point A, as shown in figure 3; the system power management circuit comprises an LDO chip and a DC/DC chip. The system power supply management circuit comprises: different levels of voltage are provided for the system, and various voltage requirements of the system are met; battery undervoltage warning circuit: an under-voltage comparison indicating circuit is formed by a voltage reference source, an under-voltage alarm chip and a triode, the state of the battery voltage is detected, the voltage is lower than 6.6V, and an LED is lightened, namely, under-voltage alarm is carried out, as shown in figure 4.
The signal coupling unit is responsible for coupling mechanical vibration signals of the equipment into voltage signals, and the strength of vibration can be represented by physical quantities such as acceleration, so that the signal coupling unit mainly comprises an acceleration sensor. The vibration information of the equipment is coupled into a voltage signal through the acceleration sensor and is transmitted to the signal conditioning unit.
The vibration frequency of the surface of the transformer, the reactor and the GIS equipment is distributed within the range of 0-2KHz, and the amplitude is within the range of hundreds of mg. In order to completely collect vibration signals of the three devices, the frequency of the selected PCB acceleration sensor is not lower than 2KHz, and the measuring range is not lower than +/-5 g pk.
The signal conditioning unit conditions a single-ended voltage signal input by the vibration sensor into a differential signal, so that the anti-interference capability of signal transmission is improved, a schematic diagram of a signal conditioning circuit is shown in fig. 5, and a differential amplification unit is adopted to condition a +/-5 Vpk single-ended signal input to +/-3.8 Vpk differential input.
The signal coupling unit comprises a vibration sensor, a socket J1 and a resistor R12; the signal conditioning unit comprises a capacitor C10, a resistor R10 and a differential amplifier, wherein a signal end of the socket J1 is used for leading out a voltage signal generated by the vibration sensor and a constant current output end A point of the constant current source power supply circuit to the vibration sensor; the signal end, the capacitor C10 and the resistor R10 are sequentially connected in series, and the other end of the resistor R10 is connected with the reverse input end of the differential amplifier; the positive input end of the differential amplifier is connected with the reference module and grounded; the output end A point of the constant current source power supply circuit is connected with the signal end, one end of the resistor R12 is connected with one end of the signal end, and the other end of the resistor R12 is grounded.
The capacitor C10 selects 10uF with larger capacitance value, and the capacitor C10 plays a role of a direct current constant current source circuit formed by strong isolation U2, so that direct current is directly supplied to a front-end IPEX type sensor; secondly, the C10 can ac couple the small signal required from the J1 sensor; in addition, the C10 and the R10 jointly form a first-order RC high-pass filter which can filter signals below about 160 Hz. In addition, the front stage adopts a precise differential amplifier composed of U4, so that the signal-to-noise ratio of the circuit can be remarkably improved.
Compared with the prior art, the invention has the following advantages:
the signal conditioning unit in the prior art is composed of a three-stage structure, a signal voltage source (a first stage), an operational amplification circuit (a second stage) and a differential amplification circuit (a third stage);
the signal conditioning unit of the invention also comprises a three-stage structure, a coupling module (second stage) and a differential amplifier (third stage), wherein the coupling module (second stage) comprises a socket J1 (first stage), a capacitor C10 and a resistor R10;
the coupling module composed of the capacitor C10 and the resistor R10 in the second-stage structure of the signal conditioning unit replaces a second-stage structure operational amplifier in the signal conditioning unit in the prior art, the operational amplifier realizes impedance transformation with a differential amplification circuit in a mode of amplifying a signal voltage source, the coupling circuit of the capacitor C10 and the resistor R10 is adopted in the signal conditioning unit, the impedance transformation is realized while AC coupling is realized, and the anti-interference capability is improved while the impedance transformation is realized, so that the signal conditioning unit has lower cost, more stable functions and simpler technical structure.
Although a vibration sensor in the prior art uses a two-stage amplifying circuit, a first-stage operational amplifying circuit realizes impedance conversion, and a second-stage differential amplifying circuit realizes common-mode interference by performing analog-to-digital conversion on a single-ended output signal of a pre-amplifying circuit, a differential amplifier is not coupled with a capacitor resistor in series to realize impedance conversion, and the technical means of eliminating interference is applied to the field of transformers.
The vibration signal conditioned by the differential amplifier realizes analog-to-digital conversion of the signal through the ADC signal acquisition unit, and the analog signal is converted into a digital signal and transmitted to the system control unit through the SPI communication interface. The ADC of the signal acquisition unit can realize 24-bit differential input of the analog-to-digital converter, can meet the requirement of high-speed signal acquisition at the sampling rate of 1.5Msps, is internally provided with a digital filter, can realize hardware circuit filtering, and avoids the influence on acquisition stability caused by electromagnetic interference of high voltage of an electric field. The external voltage reference source is provided by the power supply unit, and the reference voltage is 4.096V. The main control unit controls the conversion frequency of the ADC acquisition module, and further controls the sampling rate and the sampling depth of the wireless intelligent vibration sensor.
The system control unit mainly realizes acquisition control and transmission control, and the stm32 controller is the core of the system control unit, and controls the acquisition rate and the sampling depth of the wireless intelligent vibration sensor by controlling the conversion speed of the ADC, so as to realize the sampling control function. The wireless intelligent vibration sensor can realize wireless WIFI transmission of data, and the system control unit transmits the acquired data to the system receiving end through the wireless WIFI. The STM32 controller controls the ADC acquisition module to convert data through the SPI interface and temporarily stores the conversion result. After the sampling depth requirement is met, data conversion and collection are stopped, a data transmission function is triggered, and data are divided into a plurality of data packets to be transmitted to the WIFI transmission module. The WIFI transmission module exchanges data with the STM32 through the SDIO interface, and sends the data packet to the target host through the wireless network. Meanwhile, the system control unit can realize the automatic connection of wireless intelligent vibration starting without manual intervention.
The wireless communication unit mainly comprises parts such as wireless WIFI module, power supply circuit, interface circuit. The wireless communication module accessible SDIO or SPI interface carry out data communication with system control unit's main control chip, because SDIO's transmission speed is very fast, this design adopts the SDIO interface to drive the WIFI module. The wireless communication unit supports an 802.11b/g wireless network mode, and the wireless intelligent vibration sensor can continuously work for a long time by adopting a low-power-consumption design. The intelligent sensor can be directly connected with the equipment with the wireless network hotspot sharing function through the wireless WiFi to perform data communication.
And a customized communication protocol based on a UDP transmission protocol is developed, and the WIFI wireless communication adopts the UDP communication protocol with the functions of verification and packet loss retransmission. In order to ensure the integrity of the collected vibration information, the data volume collected by the intelligent vibration sensor is up to 75 KB. In order to ensure the transmission efficiency, a UDP transmission protocol is adopted, the protocol is a connectionless transmission protocol, the risk of packet loss exists, the integrity of data transmission is ensured, and the transmission efficiency is considered. A customized data transfer protocol based on the UDP protocol was developed. During data transmission, the vibration sensor can determine the number of data packets according to the set sampling depth of the receiving end and the fixed length of each data packet which cannot be changed. The vibration intelligent sensor sequentially increases the data packets from 1, and sequences a plurality of data packets according to the sequence of the numbers, and the numbers are used as the head of the data packets.
After the transmission is completed for one time, the receiving end analyzes the header number of the data packet, and judges whether the data is lost by comparing the total number and the number of the data packet, if the data is lost, the lost data packet number is transmitted to the control core STM32 of the intelligent vibration sensor through a TCP/IP protocol, and the data packet corresponding to the lost data packet number is retransmitted until the receiving end receives the complete data. And if the transmission is complete and no packet loss exists, continuing the next vibration data acquisition and transmission work.
It will be understood by those skilled in the art that all or part of the steps of the above facts and methods can be implemented by hardware related to instructions of a program, and the related program or the program can be stored in a computer readable storage medium, and when executed, the program includes the following steps: corresponding method steps are introduced, and the storage medium can be ROM/RAM, magnetic disk, optical disk, etc
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for collecting vibration data of iron core looseness is characterized by comprising the following steps:
s1: acquiring a mechanical vibration original signal;
s2: coupling the mechanical vibration original signal into a voltage signal;
s3: conditioning the voltage signal into a differential signal;
s4: performing analog-to-digital conversion on the differential signal to obtain a digital signal;
s5: dividing the digital signal into a plurality of data packets according to the sampling depth and the length of the data packets, and determining the total number of the data packets;
s6: numbering the data packets, sequencing the data packets according to the sequence of the numbering, and taking the numbering as a header of the data packets;
s7: transmitting the sequenced data packets;
s8: receiving the data packets, analyzing the header numbers of the data packets, analyzing the total number and the number of the data packets, and judging whether the data packets are lost or not according to the change of the total number and the sequence of the numbers;
s9: and if the data packet is lost, feeding back the lost data packet number, and retransmitting the data packet corresponding to the lost data packet number.
2. The method for collecting vibration data of loose iron core as claimed in claim 1, wherein said S9 includes the following sub-steps:
s11: feeding the lost data packet number back to a data sending end through a TCP/IP transmission protocol;
s12: and the data sending end retransmits the data packet corresponding to the lost data packet number through a UDP transmission protocol according to the fed back lost data packet number.
3. The method for collecting the vibration data of the loose iron core according to claim 1, wherein fixed values are respectively set for the sampling depth and the length of each data packet.
4. A vibration data acquisition system for loosening of an iron core is characterized by comprising a signal coupling unit, a signal conditioning unit, a signal acquisition unit, a system control unit, a wireless communication unit and a power supply unit;
the signal coupling unit: the device comprises a circuit board, a signal processing circuit and a signal processing circuit, wherein the circuit board is used for coupling a mechanical vibration original signal of equipment into a voltage signal;
the signal conditioning unit: for conditioning the voltage signal into a differential signal;
the signal acquisition unit: the differential signal processing circuit is used for carrying out analog-to-digital conversion on the differential signal to obtain a digital signal;
the wireless communication unit: sending the digital signal to a receiving end through a UDP customized data transmission protocol;
the system control unit: for controlling the transmission of the wireless communication unit, controlling the sampling rate and sampling depth of the analog-to-digital conversion;
the power supply unit: and the power management module is used for managing the power supplies of the signal coupling unit, the signal conditioning unit, the signal acquisition unit, the system control unit and the wireless communication unit.
5. The system for collecting the vibration data of the loose iron core according to claim 4, wherein the UDP customized data transmission protocol comprises a number unit, an identification unit, a sequencing unit, a header unit, a sending unit, an analysis unit, a judgment unit and a retransmission unit;
number unit: the device comprises a sampling unit, a data acquisition unit, a data processing unit and a data processing unit, wherein the sampling unit is used for sampling a digital signal;
an identification unit: the number is used for numbering the data packets;
a sorting unit: the data packet processing device is used for sequencing the data packets according to the serial number sequence;
a gauge head unit: the number is used as the header of the data packet;
a transmission unit: the data packet processing device is used for sending the sequenced data packets;
an analysis unit: the header numbers are used for analyzing the data packets;
a judging unit: the device is used for analyzing the total number and the serial number of the data packets and judging whether the data packet is lost or not according to the change of the total number and the serial number of the data packets;
a retransmission unit: for retransmission of lost packets.
6. The system for collecting data of iron core looseness vibration according to claim 5, wherein the retransmission unit comprises a feedback unit and a transmission unit;
a feedback unit: the data transmitting terminal is used for feeding back the lost data packet number to the data transmitting terminal through a TCP/IP transmission protocol;
a transmission unit: and the data packet corresponding to the lost data packet number is retransmitted through a UDP transmission protocol.
7. The system for collecting data of iron core loosening vibration according to claim 4, wherein the power supply unit comprises a constant current source power supply circuit for supplying a constant current to the signal coupling unit.
8. The system for collecting the vibration data of the loose iron core according to claim 7, wherein the power supply unit further comprises a system power management circuit and a battery under-voltage alarm circuit;
the system power management circuit: for providing different levels of voltage;
the battery under-voltage alarm circuit comprises: for performing state detection on the battery voltage.
9. The system of claim 8, wherein the system power management circuit comprises an LDO chip and a DC/DC chip.
10. The system of claim 7, wherein the signal coupling unit comprises a vibration sensor and socket J1, a resistor R12; the signal conditioning unit comprises a capacitor C10, a resistor R10 and a differential amplifier, and a signal end of the socket J1 is used for leading out the voltage signal generated by the vibration sensor and leading into a constant current output end A point of the constant current source power supply circuit to the vibration sensor; the signal end, the capacitor C10 and the resistor R10 are sequentially connected in series, and the other end of the resistor R10 is connected with the reverse input end of the differential amplifier; the positive input end of the differential amplifier is connected with the reference module and grounded; the output end A point of the constant current source power supply circuit is connected with the signal end, one end of the resistor R12 is connected with one end of the signal end, and the other end of the resistor R12 is grounded.
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