CN112880815A - Low-power-consumption spliced wireless structure vibration monitoring system and method - Google Patents

Abstract

The invention provides a low-power-consumption spliced wireless structure vibration monitoring system and method. The system comprises: the system comprises a server unit, a battery compartment splicing unit, a transformer unit and a collecting unit, wherein the collecting unit comprises a collecting splicing unit and a collecting independent unit; the acquisition splicing unit and the acquisition independent unit respectively extract structural vibration detection signals and send the acquired signals to the server unit in a wireless communication mode; the server unit is used for processing vibration data, displaying vibration waveforms in real time and warning abnormal working states; the battery bin splicing unit is used for supplying power to the system when a fixed power supply is not available; the transformer unit is used for adjusting the power supply voltage; the acquisition splicing unit is used for simultaneously measuring a plurality of measuring points, and the acquisition independent unit is used for measuring a single measuring point. The invention has the advantages of flexible configuration of the number of the measuring points, small volume after splicing, low power consumption, high density of the acquisition channel, easy deployment near the acquisition position and reduction of interference caused by overlong acquisition lines.

Description

Low-power-consumption spliced wireless structure vibration monitoring system and method

Technical Field

The invention relates to the field of structural vibration signal monitoring, in particular to a low-power-consumption spliced wireless structural vibration monitoring system and method.

Background

The structural vibration monitoring is an important mode for obtaining dynamic performance information such as structural frequency, damping, response, modal and the like, carrying out fault diagnosis and evaluating health status on the dynamic performance information, and is widely applied to the field of structural monitoring of mechanical structures, transportation tool structures, bridge building engineering structures and the like. Conventional vibration monitoring systems and schemes suffer from a number of disadvantages:

1. most of the traditional vibration acquisition monitoring system with high acquisition frequency (such as above 400 Hz) adopts a wired transmission mode and a WIFI wireless transmission mode. The wired transmission mode increases the wiring and occupies space. WIFI wireless transmission, although reducing wiring, is high in power consumption. If in the system that only singlechip and WIFI transmission module, WIFI wireless transmission accounts for more than 90% of the system power consumption, and the power consumption is huge, greatly reduced wireless system duration.

2. The working mode is single. Networking is difficult to carry out between the multichannel collector, between multichannel collector and the single channel collector, and the multichannel collector can't be assembled into to the single channel collector.

3. The collector has large volume and small density of the vibration collection channel. The traditional analog-to-digital conversion type vibration collector adopts analog-to-digital conversion and an additional circuit conversion module, so that the volume is large, and the requirement of multiple collection channels is difficult to meet. Each acquisition unit of the wireless internet-of-things type vibration acquisition device generally adopts a single battery for power supply, and the acquisition channel density is low due to low acquisition frequency and high energy consumption. During structural vibration monitoring, if the modal monitoring acquisition needs the sensor of big density arrangement, the more accurate of result is obtained to sensor quantity, requires that the collector shared space is little, light in weight moreover, puts in monitoring structure or by the structure (like inside rail vehicle structure), influences as far as possible little to the test result, easily deploys, and traditional collector is difficult to satisfy these requirements because above-mentioned shortcoming such as bulky, that acquisition density is little.

4. The wiring occupies a large space. At present, a lot of monitored structure spaces are narrow and small, and like aircraft, rail vehicle structure inner space are narrow and small, the parallel wiring of current vibration acquisition system, shared space is very big, is difficult to satisfy the big data volume acquisition channel requirement in narrow and small space.

5. The traditional vibration acquisition device cannot flexibly change the number of acquisition channels. The existing acquisition device channels are fixed, such as 8 channels, 64 channels and the like, and the acquisition channels cannot be increased or reduced according to the needs of the number of measurement points and the needs of density.

6. The sensor and the collector are too long in lead and are easily interfered. Because the traditional acceleration acquisition end is heavy in weight and large in volume and is difficult to deploy nearby along with a measuring point, when the acceleration acquisition end is used for high-density multi-channel acquisition, a plurality of long leads are arranged between the sensor and the multi-channel acquisition end, and signals in the leads are easily subjected to various electromagnetic interferences such as power frequency and the like.

7. The real-time performance is poor. Although most of current sensor devices can gather vibration signal, the signal is many to be saved in the collector, can not in time handle, and the real-time is relatively poor, is unfavorable for in time handling the problem.

8. The battery compartment is not modularized, and the battery compartment can not be flexibly combined for power supply according to the electric quantity requirement.

Disclosure of Invention

In view of the defects in the prior art, the invention provides a low-power-consumption spliced wireless structure vibration monitoring system and method, and mainly solves the technical problems that low-power-consumption and high-speed acquisition cannot be simultaneously met in structural vibration monitoring, the acquisition end is too large in size when the acquisition density of a sensor is high, the system networking is not flexible and the like.

The technical means adopted by the invention are as follows:

a low-power consumption concatenation formula wireless structure vibration monitoring system includes: the system comprises a server unit, a battery compartment splicing unit, a transformer unit and a collecting unit, wherein the collecting unit comprises a collecting splicing unit and a collecting independent unit; the acquisition splicing unit and the acquisition independent unit respectively extract structural vibration detection signals and send the acquired signals to the server unit in a wireless communication mode;

the server unit is used for processing vibration data, displaying vibration waveforms in real time and warning abnormal working states;

the battery bin splicing unit is used for supplying power to the system when a fixed power supply is not available;

the transformer unit is used for adjusting the power supply voltage;

the acquisition splicing unit is used for simultaneously measuring a plurality of measuring points, and the acquisition independent unit is used for measuring a single measuring point.

Furthermore, the collecting and splicing unit comprises a plurality of collecting modules, an upstream module, a downstream module and a vibration sensor, wherein the upstream module and the downstream module are connected to two ends of the collecting modules, so that the collecting modules form a splicing passage through the upstream module and the downstream module;

the acquisition module comprises a shell, a circuit board is arranged in the shell, a single chip microcomputer and a BLE wireless communication module are arranged on the circuit board, and the BLE wireless communication module is connected with a communication port of the single chip microcomputer;

and the circuit board is also provided with a vibration sensor bonding pad used for connecting the vibration sensor and a power line bonding pad used for connecting a power interface.

Furthermore, an SD card module is further arranged on the circuit board and connected with a storage port of the single chip microcomputer.

Furthermore, the power interface is a magnetic connector.

Further, the magnetic suction connector is connected with a fixed power supply or a mobile power supply.

Further, the vibration sensor adopts a displacement sensor, a speed sensor, an acceleration sensor or a force sensor.

Furthermore, the server unit adopts a raspberry type microcomputer, an industrial personal computer or a computer.

Furthermore, the battery cabin splicing unit comprises a plurality of battery modules connected in parallel, each battery module comprises a battery shell, a storage battery and magnet pieces, and the magnet pieces are connected to the upper side and the lower side of the battery shell;

the adjacent battery modules are connected in parallel through the magnet pieces.

The invention also provides a vibration monitoring method, which is realized based on the low-power-consumption spliced wireless structure vibration monitoring system, and comprises the following steps:

s1, arranging the vibration sensor at the position to be detected according to the use requirement;

s2, carrying out BLE communication initialization on the system, and pairing BLE communication of all acquisition modules and a server unit end;

s3, starting the system, completing networking after the successive connection of BLE, wirelessly transmitting acquired data by the acquisition module through a BLE protocol in real time, and simultaneously displaying and storing the data in real time by the server unit;

s4, redundant backup of the collected data is carried out, and the collected data is stored on the SD card;

and S5, when a new splicing unit is added, physically splicing the new acquisition module, initializing a BLE pair of the new acquisition module, and completing network access of the new acquisition module after pairing connection is successful.

Compared with the prior art, the invention has the following advantages:

1. the system has low power consumption, and each unit electronic element including the wireless transmission BLE part adopts a low-power consumption part, so that the monitoring time of the system is prolonged. Due to the fact that the low-power-consumption design, especially the Bluetooth transmission design is adopted, under the condition that the same battery capacity and the same high acquisition speed are adopted, the working time of a system adopting BLE can be longer than that of a WIFI system by more than 15 times. For example, when the capacity of the same battery is 3400mAh, the system adopting the WIFI can only monitor for 22 hours, and the system adopting the BLE mode can monitor for 15 days.

2. The system has small volume, small occupied space and high monitoring and collecting density. The distance between units is reduced by the splicing design of the acquisition modules, so that the space distribution is obviously more space-saving compared with the space distribution of the existing system, and the system is convenient to deploy in narrow structural space (such as high-speed rail equipment bins and airplane bins). Due to the adoption of the splicing intensive design, each acquisition module is provided with a plurality of sensor channels, so that the volume is small after splicing, and the density of the acquisition channels is high.

3. The number of the acquisition sensors in the invention is easy to increase and decrease. The number of the measuring points of the system is flexible, and the number of the collecting points can be increased and decreased in a splicing mode according to needs.

4. The acquisition unit is easy to deploy near the measuring point, and interference is reduced. The acquisition unit is small in size, light in weight and high in acquisition density, so that the acquisition unit is easy to directly attach to a position to be measured, for example, the surface of a structure near the position to be measured is tested, the lead between the acquisition unit and the sensor is as short as possible, and the electromagnetic interference in the lead is reduced. The acquisition unit acquires digital signals and transmits the digital signals to the server, and due to BLE wireless transmission in the form of digital signals, interference is further avoided.

5. The system has better dustproof and waterproof performance. Because the electronic components adopted by the system are all low-power consumption components, the generated heat is less, and all units of the system can be designed into a sealing mode. Meanwhile, the magnetic suction connector is adopted by the system to transmit electric energy, and the connector also has the characteristics of dust prevention and water prevention.

6. The invention adopts wireless transmission, and occupies small space. The BLE wireless communication mode adopted by the system can reduce the space and workload of system wiring compared with parallel wiring transmission.

7. The power supply can be spliced to supply power according to the monitoring time. The battery compartment splicing units of the system can be spliced in parallel according to the requirement of monitoring time capacitance, so that the capacitance of the battery compartment splicing units is increased, the problem of insufficient electric energy of the system in the working process is avoided, and the workload of workers is reduced.

8. The invention has simple structure and flexible deployment. The system is provided with a splicing unit and an acquisition independent unit, and can be wirelessly networked as required.

9. The system is good in real-time performance, the server unit is arranged in the system, collected data can be collected to the server unit in real time, vibration data are processed in time, vibration waveforms are displayed in real time, and abnormal working states are warned in time.

10. The invention has low cost. The cost of the system is greatly reduced compared to current vibration acquisition systems. According to the research on the price of the vibration acquisition system, the cheapest system needs thousands of yuan, and the cost of the system is reduced by more than 10 times.

Based on the reasons, the invention can be widely popularized in the field of vibration monitoring.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a structural diagram of a low power consumption spliced wireless structure vibration monitoring system of the present invention.

Fig. 2 is a structural diagram of an acquisition splicing unit of the present invention.

Fig. 3 is a diagram of the structure of an acquisition independent unit of the present invention.

Fig. 4 is a power supply connection diagram of the acquisition module of the present invention.

Fig. 5 is a schematic view of the structure of the acquisition module of the present invention.

Fig. 6 is an exploded view of the acquisition module of the present invention.

Fig. 7 is an exploded view of the power module of the present invention.

Fig. 8 is an exploded view of a battery module according to the present invention.

FIG. 9 is a data flow diagram of the present invention.

In the figure: 1. an acquisition module; 2. an upper housing; 3. a lower housing; 4. a fixed seat; 5. screw holes; 6. a single chip microcomputer; 7. a BLE wireless communication module; 8. an SD card module; 9. a power line pad; 10. a PCB board; 11. mounting holes; 12. a vibration sensor pad; 13. a magnetic suction joint; 14. a vibration sensor; 15. a sensor wire; 16. an upstream module; 17. a downstream module; 18. a direct current wire; 19. a power supply module; 20. a first power supply upper case; 21. a second power supply upper case; 22. a power supply lower shell; 23. a battery; 24. a server unit; 25. a battery compartment splicing unit; 26. a battery module; 27. a battery module upper case; 28. a battery module lower case; 29. a storage battery; 30. a magnet piece; 31. a transformer unit; 32. collecting and splicing units; 33. and collecting independent units.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 to 9, the present invention provides a low power consumption spliced wireless structure vibration monitoring system, which mainly comprises: the system comprises a collecting and splicing unit 32, a collecting and independent unit 33, a server unit 24, a battery compartment splicing unit 25 and a transformer unit 31. Wherein, the collecting splicing unit and the collecting independent unit are collectively called as a collecting unit; the acquisition splicing unit, the acquisition independent unit and the power module are collectively called a data acquisition group.

The acquisition splicing unit comprises an acquisition module 1, an upstream module 16, a downstream module 17 and a direct current wire 18. The acquisition module 1 comprises a housing, a circuit board, a power interface and a vibration sensor 14.

The casing includes that casing 2 and lower casing 3 form cavity accommodation space under screw hole 5's fixed, and fixing base 4 sets up casing 3 below down. The circuit board is provided with a single chip microcomputer 6, a BLE wireless communication module 7, an SD card module 8, a power line pad 9, a PCB 10, a mounting hole 11 and a vibration sensor pad 12. The power interface adopts a magnetic connector 13. The vibration sensor is connected to the PCB board by a sensor wire 15. The vibration sensor can be selected from a displacement sensor, a speed sensor, an acceleration sensor, a force sensor and the like, and the shell of the vibration sensor is made of metal, such as aluminum alloy, so that the interference of electromagnetic signals is prevented.

Specifically, as shown in fig. 5 to 6, the upper housing 2 and the lower housing 3 are fastened by 4 screws, and the lower housing 3 and the fixing base are fastened and connected by two screws. The fixed seat can be adhered to the position to be measured by strong adhesion. The circuit board is fixed in the lower case 3 by four screws. The power interface and the vibration sensor are both welded on the circuit board through wires. In the equipment, the circuit board completes the connection of the singlechip, the BLE wireless communication module, the SD card module, the power line bonding pad and the vibration sensor bonding pad. The SD card module is used for storing the acquired vibration data.

Further, the casing of equipment is the cuboid, and wherein relative two sides respectively have a power source interface, and the two functions are respectively one for collection module 1 is inside provides the electric energy, and another provides the electric energy for next collection module 1.

Further, the power source interface is various, wherein, the magnetic suction connector is more excellent. The magnetic connector can be used for fastening connection, can play a role in positioning when each system unit is spliced, has the waterproof and dustproof effect, and can still stably transmit electric energy even if the magnetic connector is connected in dust or water.

Further, there are two power supply modes for the acquisition splicing unit 32, one is a fixed power supply for supplying power to the acquisition splicing unit, and the other is a movable power supply for supplying power to the battery compartment splicing unit. The magnetic suction connector 13 can be used as both the power output port connector and the power output port connector, and the power supply power is transmitted to the system through the magnetic suction connector 13.

In use, each acquisition stitching unit 32 has N (N ═ 1, 2 … N) vibration sensors 14, and can simultaneously measure multiple measurement points. The number N of the vibration sensors 14 can be selected according to the configuration and performance of different singlechips 6, and 4 vibration sensors 14 are preferred in this embodiment, as shown in fig. 3.

The upstream module 17 and the downstream module 18 serve as interface modules to enable the spliced N acquisition modules 1 to form a channel. The acquisition and splicing unit 32 has high degree of integration and small volume after splicing, and is mainly used for acquisition of a large-density sensor. The length of the sensor wire connecting the vibration sensor 14 and the length of the dc wire connecting the battery compartment splicing units are variable, and suitable dimensions can be selected for connection as required.

The acquisition independent unit 33 includes an acquisition module 1 and a power supply module 19. The acquisition module 1 is the same as the acquisition module 1 in the acquisition splicing unit. The power supply module 19 includes: casing 20, casing 21, casing 22, battery 23, magnetism connector. The acquisition independent units can be spliced with N (N is 1, 2 … N) acquisition modules 1, are mainly used for single acquisition points and are flexibly arranged.

In the invention, the acquisition module 1 collects the acquired data to the server unit 24 in real time, processes the vibration data in time, displays the vibration waveform in real time and warns the abnormal working state in time. The server unit 24 realizes wireless transmission between the BLE wireless communication module 7 and the acquisition unit 1 through the USB HUB extender. The server unit 24 may be a raspberry-type microcomputer, an industrial personal computer, or a computer. When the vibration data processing method is used, the vibration data processing method is diversified, the vibration data processing method is open, and the signal processing method can be selected automatically.

The battery compartment splicing unit 25 can supply power for the system without a fixed power supply, and can be infinitely spliced in parallel through the battery modules 26, so that the capacity of the battery compartment splicing unit is increased, and the endurance time is prolonged. The battery module includes: battery module upper case 27, battery module lower case 28, battery 29, magnet piece 30. The magnet piece 30 is adhesively connected to the upper and lower housings 3. The battery modules 26 are connected by magnetic sheets, and the assembly is simple.

The transformer unit 31 can reduce 220V to the available voltage between 7V and 12V, and directly supply power to the system.

The system has three working conditions: the method comprises the following steps of I, acquiring the power supply condition of an on-site external power supply, II, acquiring the power supply condition of a battery cabin splicing unit, and III, acquiring the power supply condition of a power supply module, and is shown in figure 1.

The above-mentioned acquisition and splicing unit 32 performs a physical splicing process, which mainly includes:

1. and splicing the acquisition modules 1 into a splicing module group. The power supply between the splicing modules is magnetically absorbed and transmitted and is reinforced by a fastening piece.

2. In the same manner, the upstream module 16 and the downstream module 17 are connected to the upper end and the lower end of the mosaic module group, respectively, as the acquisition mosaic unit 32. The acquisition stitching unit 32 may provide a high density acquisition function, and may stitch different numbers of acquisition modules 1 according to the acquisition number. And the occupied space can be saved due to the adoption of a splicing intensive mode.

3. The acquisition splicing units 32 are connected in series by direct current wires. When the power supply is a battery compartment, the battery modules are magnetically attracted, spliced and connected in the number of the modules according to the power consumption. And connecting the splicing unit with a power supply to form a system.

4. The fixing seat of the acquisition independent unit 33 is fixed in an adhesive mode.

The physical connection process of the above-mentioned acquisition independent unit 33 is as follows:

1. the acquisition module 1 is spliced with the power module 19. The power supply between the splicing modules is magnetically absorbed and transmitted and is reinforced by a fastening piece. The connection of the acquisition module 1 can also be continued if necessary.

2. The fixing seat of the acquisition independent unit 33 is fixed in an adhesive mode.

Further, in the process of networking the system, the communication mode adopted between the server unit 24 and the acquisition unit is a BLE wireless communication mode, and the networking and operating methods of the system are as follows:

1. and initializing system BLE communication. The system only needs to be initialized (paired) for the first time of networking. Every time later when gathering, paired BLE is all can the automatic connection:

1) a BLE wireless communication module is selected. The model of BLE can select different types, and it is more preferable to select the same type. The used BLE protocol needs to be more than 4.0, and the traditional Bluetooth is non-low-power Bluetooth, so the system selects the BLE protocol to be more than 4.0 and is better.

2) And (4) setting BLE.

A server unit side: the server unit is connected to the USB HUB such that the server unit is provided with a plurality of USB ports. The BLE wireless communication module is connected to a USB port of the server unit in a USB-to-TTL mode to generate a serial port and a serial port number. For its information: such as a password, a name, etc., wherein the name is set to the name AN corresponding to the respective acquisition module 1 (N ═ 1, 2 … N). And setting the BLE wireless communication module to be in a master device mode.

1 end of the acquisition module: in the same step, the information of BLE is set, the acquisition modules 1 are sequentially named as AN (N is 1, 2 … N), and the BLE wireless communication module is set to the slave device mode.

3) The BLE wireless communication module at the server unit end and the collection module 1 end are paired. The BLE wireless communication modules at the two ends are respectively electrified. Peripheral BLE wireless communication module slave devices are searched at the server unit end (the slave devices can be distinguished through preset names), and each searched slave device is paired and connected with the corresponding BLE wireless communication module master device. And storing the pairing information into the primary equipment of the BLE wireless communication module so that the primary equipment and the secondary equipment can be automatically connected when the secondary equipment is powered on next time.

4) And pairing BLE communication of all the acquisition modules 1 and the server unit end according to the steps.

2. And collecting data. And starting the system, and finishing networking after the BLE is successively connected. The acquisition module 1 performs wireless real-time transmission through a BLE protocol. The server unit performs real-time display and storage. The server unit end can perform real-time FFT on the acquired data to obtain frequency domain data. And after the processed data are obtained, carrying out corresponding processing, and displaying warning if the frequency domain amplitude of the vibration data exceeds a certain threshold value to indicate that the vibration of the object to be measured is aggravated.

3. And (5) fault processing of the acquisition module 1. When some ports of the acquisition module 1 have faults, such as acquisition errors, the acquisition module 1 sends an acquisition point name (for example, A1-1 represents the first acquisition point of the acquisition module 1A 1) and acquisition port error data to the server unit, and the server unit prompts an alarm according to the recorded acquisition errors.

4. And collecting data redundancy backup. To improve reliability, data is stored on the SD card as a redundant backup.

5. A new acquisition module 1 is accessed. If a new splicing unit is added, the new acquisition module 1 is physically spliced, and then its BLE pair is initialized using step 1. If a new stand-alone unit is added, its BLE pair is initialized using step 1. And after the pairing connection is successful, the new acquisition module 1 completes network access.

The invention also provides a vibration monitoring method, which is realized based on the system and comprises the following steps:

s1, arranging the vibration sensor at the position to be detected according to the use requirement;

s2, carrying out BLE communication initialization on the system, and pairing BLE communication of all acquisition modules 1 and a server unit end;

s3, starting the system, completing networking after the successive connection of BLE, and enabling the acquisition module 1 to wirelessly transmit acquired data in real time through a BLE protocol and simultaneously enabling the server unit to display and store the data in real time;

s4, redundant backup of the collected data is carried out, and the collected data is stored on the SD card;

and S5, when a new splicing unit is added, physically splicing the new acquisition module 1, initializing a BLE pair of the new acquisition module 1, and completing network access of the new acquisition module 1 after pairing connection is successful.

The solution of the invention is further illustrated below by means of a specific application example.

The system of the embodiment occupies a small space and is easy to deploy. The volume of the acquisition module 1 is small, as shown in fig. 1, and its size is 60 × 60 × 22 mm. In addition, the system can meet the requirement of high-speed data transmission and realize low power consumption in the data transmission process. Specifically, the method comprises the following steps:

1. selecting electronic elements of the splicing unit:

a single chip microcomputer: there are many kinds of single-chip microcomputers currently on the market, for example: ATM32, MSP430, PIC, AVR, and the like. For the system, the AVR-based arduino nano is adopted, and other single-chip microcomputers can be adopted.

Vibration sensor: the vibration sensor comprises a displacement sensor, a speed sensor, an acceleration sensor, a force sensor and the like, and the system can select the acceleration sensor with the model of ADXL345 and MPU 6050. This example illustrates four vibration sensors per acquisition unit.

A power interface: the electronic connectors currently on the market are quite rich in style, and magnetic connectors are more preferable for the system.

A data storage module: the module for storing data can be selected according to the storage capacity and volume, and the miniSD card is preferably used for the system.

The battery of the battery compartment splicing unit: the current battery types and capacities are various, and the system selects 18650 batteries as the batteries, and can also select other types of batteries. The electric capacity of the battery is selected to be 3400mAh, and the electric capacity of the battery bin splicing unit is effectively increased compared with other batteries.

Collecting the batteries of the independent units: in order to make the power module of the unit and the collection independent unit spliced together beautiful, the size of the battery selected by the unit should be as small as possible to exceed the size of the shell, and the collection unit is preferably provided with a Beston9V rechargeable square battery. The capacity of the battery is selected to be 1000 mAh.

2. As shown in fig. 1, based on the proposed system construction method, the acquisition units are spliced according to the requirement of the measurement quantity, and then spliced with the battery compartment splicing unit and the power module spliced by the battery module, the server unit is started, the USB HUB is connected, and the BLE wireless communication module master device is inserted on the USB HUB. Each BLE wireless communication module is initialized (the specific initialization step refers to the above description), and the BLE wireless communication module master device generates respective serial ports and serial port numbers at the server unit end and receives data through selecting the serial ports.

3. The collection splicing unit group is connected as shown in fig. 2, each collection splicing unit is connected with a power supply in a power connection mode as shown in fig. 4, and each collection splicing unit is connected to the battery compartment splicing unit in a parallel connection mode. All the units are connected through magnetic connectors to form a system circuit path.

4. As shown in fig. 8, when the system operates, Arduino nano of each sampling unit simultaneously controls 4 channel acceleration sensors of each unit to collect vibration signals from measurement points, stores the collected data in the SD card module, and at the same time, the BLE wireless communication module (slave device) sends the data to the BLE wireless communication module (master device) at the server unit at a high collection rate (e.g., 500 HZ). The server unit receives data via the USB HUB.

5. The server unit displays and stores the data acquired by each acquisition unit in real time according to the serial port number (such as com1) and the corresponding acquisition point number (such as A1-1), and the server unit end performs real-time FFT on the acquired data to acquire frequency domain data. After the processed data are obtained, time domain and frequency domain oscillograms of all the acquisition points are drawn in real time through a program. The oscillogram can visually display the vibration condition. The server records the time domain and frequency domain data. If the vibration amplitude is abnormal and the amplitude of the vibration exceeds the threshold value for a period of time, the vibration of the measuring point is abnormal, and the server unit gives an alarm.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a low-power consumption concatenation formula wireless configuration vibration monitoring system which characterized in that includes: the system comprises a server unit, a battery compartment splicing unit, a transformer unit and a collecting unit, wherein the collecting unit comprises a collecting splicing unit and a collecting independent unit; the acquisition splicing unit and the acquisition independent unit respectively extract structural vibration detection signals and send the acquired signals to the server unit in a wireless communication mode;

the server unit is used for processing vibration data, displaying vibration waveforms in real time and warning abnormal working states;

the battery bin splicing unit is used for supplying power to the system when a fixed power supply is not available;

the transformer unit is used for adjusting the power supply voltage;

the acquisition splicing unit is used for simultaneously measuring a plurality of measuring points, and the acquisition independent unit is used for measuring a single measuring point.

2. The low-power-consumption spliced wireless structural vibration monitoring system as claimed in claim 1, wherein the collecting and splicing unit comprises a plurality of collecting modules, an upstream module, a downstream module and a vibration sensor, the upstream module and the downstream module are connected to two ends of the collecting modules, so that the plurality of collecting modules form a splicing passage through the upstream module and the downstream module;

the acquisition module comprises a shell, a circuit board is arranged in the shell, a single chip microcomputer and a BLE wireless communication module are arranged on the circuit board, and the BLE wireless communication module is connected with a communication port of the single chip microcomputer;

and the circuit board is also provided with a vibration sensor bonding pad used for connecting the vibration sensor and a power line bonding pad used for connecting a power interface.

3. The low-power-consumption spliced wireless structure vibration monitoring system as claimed in claim 2, wherein an SD card module is further arranged on the circuit board, and the SD card module is connected with a storage port of the single chip microcomputer.

4. The system of claim 2, wherein the power interface is a magnetic connector.

5. The low-power consumption spliced wireless structural vibration monitoring system as claimed in claim 4, wherein the magnetic connector is connected to a fixed power supply or a mobile power supply.

6. The low-power spliced wireless structure vibration monitoring system as claimed in claim 2, wherein the vibration sensor is a displacement sensor, a velocity sensor, an acceleration sensor or a force sensor.

7. The low-power-consumption spliced wireless structure vibration monitoring system as claimed in claim 1, wherein the server unit is a raspberry-type microcomputer, an industrial personal computer or a computer.

8. The low-power-consumption spliced wireless structural vibration monitoring system as claimed in claim 1, wherein the battery compartment splicing unit comprises a plurality of battery modules connected in parallel, each battery module comprises a battery shell, a storage battery and magnet pieces, and the magnet pieces are connected to the upper side and the lower side of the battery shell;

the adjacent battery modules are connected in parallel through the magnet pieces.

9. A vibration monitoring method is realized on the basis of the low-power-consumption spliced wireless structure vibration monitoring system of any one of claims 1 to 8, and is characterized by comprising the following steps of:

s1, arranging the vibration sensor at the position to be detected according to the use requirement;

s2, carrying out BLE communication initialization on the system, and pairing BLE communication of all acquisition modules and a server unit end;

s3, starting the system, completing networking after the successive connection of BLE, wirelessly transmitting acquired data by the acquisition module through a BLE protocol in real time, and simultaneously displaying and storing the data in real time by the server unit;

s4, redundant backup of the collected data is carried out, and the collected data is stored on the SD card;

and S5, when a new splicing unit is added, physically splicing the new acquisition module, initializing a BLE pair of the new acquisition module, and completing network access of the new acquisition module after pairing connection is successful.

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