CN201402217Y - Bridge load detecting device based on wireless sensor network - Google Patents
Bridge load detecting device based on wireless sensor network Download PDFInfo
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- CN201402217Y CN201402217Y CN2009200330542U CN200920033054U CN201402217Y CN 201402217 Y CN201402217 Y CN 201402217Y CN 2009200330542 U CN2009200330542 U CN 2009200330542U CN 200920033054 U CN200920033054 U CN 200920033054U CN 201402217 Y CN201402217 Y CN 201402217Y
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Abstract
The utility model discloses a bridge load detecting device based on a wireless sensor network. The bridge load detecting device is composed of the following seven modules: a strain collecting module,a deflection collecting module, an acceleration collecting module, a data processing module, a wireless transmitting and receiving module, a power supply module of the strain collecting module, and apower supply module of the data processing module as well as the wireless transmitting and receiving module. The bridge load detecting device has the functions of collecting, processing as well as wireless transmission of sensor data, control as well as management of sensor nodes, upper computer displaying, analyzing as well as evaluating of collected data, and the like. The bridge load detectingdevice can carry out overall detection and comprehensive evaluation on the performance of bridges which are in various forms as well as structures and are widely used at present; the bridge load detecting device is used for checking the construction quality of the newly-built bridges, assessing the bearing capacity of the existing bridges and verifying as well as developing the structural design of the bridges.
Description
Technical field
The utility model relates to a kind of bridge load pick-up unit, particularly a kind of bridge load pick-up unit based on radio sensing network.
Background technology
In present bridge load detects, all be to adopt wired mode to finish for the transmission that detects data.Because bridge structure has many characteristics such as self structure complexity, bigger, the of living in geographical environment of span be abominable, just detection has brought many inevitable drawbacks to bridge load for this: as the wiring workload introduce undesired signal greatly, easily, various cable is not easily distinguishable, is not easy to carry and transportation, cost are more high.
Along with the fast development of communication, the drawback that bridge load detects data wire transmission becomes more sharp-pointed, and a kind of detection system based on radio sensing network has been come into people's sight gradually.Developed country such as the U.S., Italy has successively made a lot of research to the wireless transmission method of information and has reached its maturity.But the price of external checkout equipment is often relatively more expensive, for example the quotation of a wireless sensor node of U.S.'s bridge diagnostic companies release is up to 60,000 yuans, the price of equipment set is high especially, and this significant discomfort is closed the national conditions and the national level of consumption of China.Drink research institution for some domestic universities and also be engaged in the research work of this respect.But, up to now, the domestic bridge load checkout equipment of realizing by radio sensing network that a complete, moulding also do not occur.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of bridge load pick-up unit based on radio sensing network is provided, and can realize that bridge static load dynamic load detects functions such as the collection of data, processing automatically, wireless transmission and assay.
The technical solution of the utility model is achieved in that by seven modules of supply module of the supply module of strain acquirement module, amount of deflection acquisition module, acceleration acquisition module, data processing module, radio receiving transmitting module, strain acquirement module and data processing and radio receiving transmitting module to be formed, and strain acquirement module, amount of deflection acquisition module and acceleration acquisition module link to each other with the analog-to-digital conversion port of data processing module respectively; Data processing module and radio receiving transmitting module communicate by spi bus; Data processing module and supplementary storage module are based on also that spi bus communicates by letter; The data transmission of radio receiving transmitting module sink nodes SINK it and host computer is by serial communication, the supply module of strain acquirement module is given the strain acquirement module respectively and is quickened the biasing addition module power supply of acquisition module, and the supply module of data processing and radio receiving transmitting module is given data processing module ATMega128L and radio receiving transmitting module CC2420 power supply.
The strain acquirement module is made up of foil gauge, Precision trimming potentiometer, instrument amplifier AD620AN, biasing module and the strain acquirement supply module etc. of 1K, the potentiometer of the foil gauge of two 1K and two Precision trimmings constitutes a measuring bridge, per half brachium pontis of electric bridge is made of a foil gauge and a Precision trimming potentiometer series connection, at the non-earth terminal of two potentiometers, draw the differential input signal of two signal wires as amplification module.
Described biasing module is a voltage divider, be composed in series by the resistance of a 1K and the Precision trimming potentiometer of a 2K, and at the voltage of its two ends adding+5V, draw 5 pins that a signal line inserts instrument amplifier AD620AN from the tie point of resistance and potentiometer then, in order to negative voltage is become positive voltage.
The amount of deflection acquisition module is made up of instrument battery 9V and LVDT displacement transducer, the both positive and negative polarity of instrument battery is received respectively on two power leads of LVDT displacement transducer, two signal wires of displacement transducer are inserted the analog-to-digital conversion port of data processing module respectively, wherein on any one and the GND ground pin.
The acceleration acquisition module is by+5V supply module, acceleration transducer YE5932A, the biasing addition module is formed, the biasing addition module of this module is by chip LM324, the resistance of 1 10K, the Precision trimming potentiometer of 1 20K and the electrochemical capacitor of a 4.7uF constitute, degree of will speed up sensor acquisition to signal send into the negative polarity end of 4.7uF electrochemical capacitor, the resistance of 10K and the Precision trimming potentiometer of 20K are connected, and at the voltage of its two ends adding+3V, the positive ends of electrochemical capacitor is linked to each other with the tie point of resistance and potentiometer, and from then on draw 3 ports of signal wire to LM324, simultaneously with the 4 port access+5V voltages of LM324,11 port ground connection, 1 and 2 ports interconnect, to send into analog-to-digital conversion ADC port through 1 port of the signal LM324 behind the addition, wherein any one so that data processing module carries out the processing of data.
The supply module of data processing and radio receiving transmitting module is+the 3.3V supply module, constitute by two joint dry cells and chip MAX1678, the positive pole input of two joint dry cells is connected with its 1,4,7 ports, 5,6 ports link to each other with the negative pole of battery, the voltage of 8 ports output 3.3V, between 1 and 7 ports, be connected into the inductance of a 47uH, connect the electrochemical capacitor of a 10uF between 8 ports and the ground.
The supply module of strain acquirement module is made of two joint dry cells and chip MAX631, the input voltage of 1.5V～3.0V is provided for the MAX631 chip with two joint dry cells, 4 ports of MAX631 are as the input of cell voltage, 1,3 and 7 port ground connection, 5 ports are as the output port that transforms voltage, between 4 ports and anode, connect simultaneously the inductance of a 330mH, between 5 ports and ground, connect the electrochemical capacitor of a 0.1uF.
This inspection utility model adopts the technology of radio sensing network, and the wireless communication mode based on the ZigBeX agreement is adopted in the transmission of data, has avoided the large-scale wiring of wire transmission pattern, has reduced the detection cost, has improved the work efficiency that bridge detects.
Description of drawings
Fig. 1 is wireless bridge load pick-up unit structured flowchart;
Fig. 2 is a strain acquirement module principle block diagram;
Fig. 3 is the biasing module theory diagram of strain acquirement module;
Fig. 4 is an amount of deflection acquisition module interface block diagram;
Fig. 5 is an acceleration acquisition module interface block diagram;
Fig. 6 is the biasing addition module theory diagram of acceleration acquisition module;
Fig. 7 is the power supply block diagram of strain acquirement module;
Fig. 8 is the power supply block diagram of data processing and radio receiving transmitting module;
Below in conjunction with accompanying drawing content of the present utility model is described in further detail.
Embodiment
Bridge load pick-up unit based on radio sensing network of the present utility model is made up of strain transducer, displacement transducer, acceleration transducer, collection amplification filtering circuit, AVR single-chip microcomputer, radio frequency chip CC2420, power supply module circuit, download debugger and computing machine etc.Bridge load pick-up unit based on radio sensing network of the present utility model mainly is made up of the acquisition module of sensing data, the processing module of data, the wireless transport module (having data sends and receiving function) of data.Be separate between each module, data processing module is connected with data acquisition module by ADC (analog to digital converter) port, the wireless transport module of data is realized communicate by letter by spi bus and data processing module, and data transmission module is being connected by serial communication realization and host computer again.Host computer is responsible for monitoring each slave computer module, can issue routing iinformation to wireless transport module, also can receive to handle the detection data that each module transmits, video data information and waveform.Each module is carried out the instruction of host computer, transmits to host computer and detects data.The UART interface circuit is responsible for the serial communication between radio receiving transmitting module and host computer.
At first utilize the TinyOS Integrated Development Environment that data processing and wireless transmission program are compiled, file destination after will compiling by AVRStudio downloads among the ATMega128L, utilize the application program of host computer that the correlation parameter of serial communication is set, and open communication port, host computer also can utilize wireless mode to send to each sensor node by the routing iinformation that the routing simulation platform obtains simultaneously.Then the output signal of displacement transducer, acceleration transducer and strain signal conditioning module is linked into analog-to-digital conversion (ADC) port of ATMega128L.Then open the switch of each sensor node and SINK node, and the SINK node switch of communicating by letter with host computer.Can see the data message of each sensor and relevant oscillogram by the program of host computer, when data acquisition finishes, the data item of this collection can be generated form, realize field print.
With reference to shown in Figure 1, strain data acquisition module, deflection data acquisition module and acceleration information acquisition module interconnect with analog-to-digital conversion (ADC) port of data processing module respectively, the core of data processing module is AVR single chip computer AT mega128L, and this processor is inner integrated, and 8 10 analog-to-digital conversion (ADC) transforms port.Since in the process of wireless transmission in order to prolong the distance of transmission, the spy has adopted the mode of multi-hop relay, this mode can make the processor of certain node compile lot of data, and the storage space of processor inside is very limited, added supplementary storage module---AT45DB041 at this, this memory module comprises 2048 pages, and each page has the space of 264 bytes, thereby has increased the memory capacity of each processing node greatly.Communicating by letter between single-chip microcomputer and the supplementary storage is based on spi bus, and single-chip microcomputer under the clock control of strictness, is finished the read-write operation to supplementary storage according to the read-write operation sign indicating number of supplementary storage.Radio frequency chip---the CC2420 that radio receiving transmitting module adopts, this chip is supported the 802.15.4 agreement, the frame format of MAC and PHY is produced automatically by hardware, it is inner integrated digital modulation and demodulation module, analog-to-digital conversion (ADC), DAC, direct up-conversion module, double conversion Low Medium Frequency module etc.Just because of this chip internal integrated power amplifier, low noise amplifier and frequency mixer, thereby make the peripheral circuit of radio receiving transmitting module fairly simple.Also be based on spi bus for the data communication of single-chip microcomputer and radio receiving transmitting module, its corresponding port SI, SO, CSN, SCLK link to each other with MOSI, MISO, SS, the SCK port of single-chip microcomputer respectively to realize data communication.The signal of the RF communications of this device is a digital signal, and transmission frequency has 16 transmission channels at 2.4G～2.4835GHz, and the path of transmission is determined by the routing iinformation of routing simulation platform generation, thereby the multi-hop wireless of realizing data transmits.Sink nodes (SINK) are to adopt virtual serial communication with communicating by letter of host computer.The supply module of strain acquirement module is also referred to as+the 5V supply module, and the supply module of data processing and radio receiving transmitting module is also referred to as+supply module of 3.3V.
With reference to shown in Figure 2, in the strain acquirement module of device, it by electric bridge, weak signal amplification module and+supply module of 5V forms.The foil gauge (inserting respectively) that comprises two 1K in the electric bridge from BSGA1 and BSGA2, the potentiometer of two Precision trimmings (R1 and R2), half brachium pontis of electric bridge is made of a foil gauge and a Precision trimming potentiometer series connection, at the non-earth terminal of two potentiometers, draw the differential input signal of two signal wires as amplification module.Because analog-to-digital conversion (ADC) port can only be discerned positive voltage, and the amplification of differential signal output has positive and negative, therefore in strain sensor modules, add biasing module, with reference to shown in Figure 3, it is a voltage divider, be composed in series by the resistance of a 1K (Rb) and the Precision trimming potentiometer of a 2K (ZER01), and at the voltage of its two ends adding+5V, draw 5 pins that a signal line inserts instrument amplifier AD620AN from the tie point of resistance and potentiometer then, in order to negative voltage is become positive voltage.Simultaneously, electric bridge and instrument amplification module all utilize+power supply of the supply module of 5V.
With reference to shown in Figure 4, in the amount of deflection acquisition module interface schema, adopt the instrument battery of 9V to give the power supply of LVDT displacement transducer.Because the downwarp value during general bridge static load is very little usually, maximum can not surpass 3 centimetres, so if displacement transducer is put suitably with respect to the position of bridge, the polarity of its output line both end voltage is constant.In view of such cause, the signal of displacement transducer output terminal can be directly connected in analog-to-digital conversion (ADC) port of processing module, processing module is sent into the result that A/D transforms in analog-to-digital conversion (ADC) register, with the Data Source as radio receiving transmitting module.
With reference to shown in Figure 5, acceleration acquisition module interface schema, the acceleration transducer that in this device, adopts in rational output range scope (under current gear, the beat of pointer to surpass 1/3 range and less than 2/3 range), its output voltage range is between positive and negative 1V.In view of analog-to-digital conversion (ADC) port can not transform negative voltage, introduce the biasing addition module herein, with reference to shown in Figure 6, it is by chip LM324, the Precision trimming potentiometer of the resistance of 1 10K, 1 20K and the electrochemical capacitor of a 10uF constitute, and the bias voltage of 1.2V is provided for the output signal of acceleration transducer.Degree of will speed up sensor acquisition to signal send into the negative polarity end of 4.7uF electrochemical capacitor, the resistance of 10K and the Precision trimming potentiometer of 20K are connected, and at the voltage of its two ends adding+3V (two batteries provide), the positive ends of electrochemical capacitor is linked to each other with the tie point of resistance and potentiometer, and from then on draw 3 ports of signal wire to LM324, simultaneously with the 4 port access+5V voltages of LM324,11 port ground connection, 1 and 2 ports interconnect.The power supply of biasing addition module still utilizes+supply module of 5V.To send into analog-to-digital conversion (ADC) port through the signal behind the addition (1 port of LM324) then, so that data processing module carries out the processing of data.
With reference to shown in Figure 7, the supply module of strain acquirement module, just be mentioned to previously+the 5V supply module, utilize two joint dry cells that the input voltage of 1.5V～3.0V is provided for the MAX631 chip, 4 ports of MAX631 are as the input of cell voltage, 1,3 and 7 port ground connection, and 5 ports are as the output port that transforms voltage, in the normal situation of powered battery, the output voltage of this port is+5V.Simultaneously, the peripheral circuit of MAX631 is very simple, connects the energy storage inductor of a 330mH between 4 ports and anode, connects the electrochemical capacitor of a 100uF between 5 ports and ground, in order to remove noise.
With reference to shown in Figure 8, what this supply module adopted is the MAX1678 chip, the positive pole input of two joint dry cells is connected with its 1,4,7 ports, 5,6 ports link to each other with the negative pole of battery, the voltage of 8 ports output 3.3V, between 1 and 7 ports, be connected into the inductance of a 47uH, connect the electrochemical capacitor of a 10uF between 8 ports and the ground.This module mainly is to be used for chip power supply to data processing module and radio receiving transmitting module.
Claims (7)
1, based on the bridge load pick-up unit of radio sensing network, it is characterized in that, be made up of the supply module of strain acquirement module, amount of deflection acquisition module, acceleration acquisition module, data processing module, radio receiving transmitting module, strain acquirement module and seven modules of supply module of data processing and radio receiving transmitting module, strain acquirement module, amount of deflection acquisition module and acceleration acquisition module link to each other with the analog-to-digital conversion port of data processing module respectively; Data processing module and radio receiving transmitting module communicate by spi bus; Data processing module and supplementary storage module are based on also that spi bus communicates by letter; The data transmission of radio receiving transmitting module sink nodes SINK it and host computer is by serial communication, the supply module of strain acquirement module is given the strain acquirement module respectively and is quickened the biasing addition module power supply of acquisition module, and the supply module of data processing and radio receiving transmitting module is given data processing module ATMega128L and radio receiving transmitting module CC2420 power supply.
2, the bridge load pick-up unit based on radio sensing network according to claim 1, it is characterized in that, the strain acquirement module is made up of foil gauge, Precision trimming potentiometer, instrument amplifier AD620AN, biasing module and the strain acquirement supply module etc. of 1K, the potentiometer of the foil gauge of two 1K and two Precision trimmings constitutes a measuring bridge, per half brachium pontis of electric bridge is made of a foil gauge and a Precision trimming potentiometer series connection, at the non-earth terminal of two potentiometers, draw the differential input signal of two signal wires as amplification module.
3, the bridge load pick-up unit based on radio sensing network according to claim 2, it is characterized in that, described biasing module is a voltage divider, be composed in series by the resistance of a 1K and the Precision trimming potentiometer of a 2K, and at the voltage of its two ends adding+5V, draw 5 pins that a signal line inserts instrument amplifier AD620AN from the tie point of resistance and potentiometer then, in order to negative voltage is become positive voltage.
4, the bridge load pick-up unit based on radio sensing network according to claim 1, it is characterized in that, the amount of deflection acquisition module is made up of instrument battery 9V and LVDT displacement transducer, the both positive and negative polarity of instrument battery is received respectively on two power leads of LVDT displacement transducer, two signal wires of displacement transducer are inserted the analog-to-digital conversion port of data processing module respectively, wherein on any one and the GND ground pin.
5, bridge load pick-up unit based on radio sensing network according to claim 1, it is characterized in that, the acceleration acquisition module is by+5V supply module, acceleration transducer YE5932A, the biasing addition module is formed, the biasing addition module of this module is by chip LM324, the resistance of 1 10K, the Precision trimming potentiometer of 1 20K and the electrochemical capacitor of a 4.7uF constitute, degree of will speed up sensor acquisition to signal send into the negative polarity end of 4.7uF electrochemical capacitor, the resistance of 10K and the Precision trimming potentiometer of 20K are connected, and at the voltage of its two ends adding+3V, the positive ends of electrochemical capacitor is linked to each other with the tie point of resistance and potentiometer, and from then on draw 3 ports of signal wire to LM324, simultaneously with the 4 port access+5V voltages of LM324,11 port ground connection, 1 and 2 ports interconnect, to send into analog-to-digital conversion ADC port through 1 port of the signal LM324 behind the addition, wherein any one so that data processing module carries out the processing of data.
6, the bridge load pick-up unit based on radio sensing network according to claim 1, it is characterized in that, the supply module of data processing and radio receiving transmitting module is+the 3.3V supply module, constitute by two joint dry cells and chip MAX1678, the positive pole input of two joint dry cells is connected with its 1,4,7 ports, 5,6 ports link to each other with the negative pole of battery, the voltage of 8 ports output 3.3V, between 1 and 7 ports, be connected into the inductance of a 47uH, connect the electrochemical capacitor of a 10uF between 8 ports and the ground.
7, the bridge load pick-up unit based on radio sensing network according to claim 1, it is characterized in that, the supply module of strain acquirement module is made of two joint dry cells and chip MAX631, the input voltage of 1.5V～3.0V is provided for the MAX631 chip with two joint dry cells, 4 ports of MAX631 are as the input of cell voltage, 1,3 and 7 port ground connection, 5 ports are as the output port that transforms voltage, between 4 ports and anode, connect simultaneously the inductance of a 330mH, between 5 ports and ground, connect the electrochemical capacitor of a 0.1uF.
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| CN2009200330542U CN201402217Y (en) | 2009-05-11 | 2009-05-11 | Bridge load detecting device based on wireless sensor network |
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| CN2009200330542U CN201402217Y (en) | 2009-05-11 | 2009-05-11 | Bridge load detecting device based on wireless sensor network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551282B (en) * | 2009-05-11 | 2013-06-05 | 长安大学 | Bridge load detecting system based on wireless sensor network |
| CN103148889A (en) * | 2012-12-25 | 2013-06-12 | 中国神华能源股份有限公司 | Bridge detection analysis system and bridge detection analysis method |
| CN103398682A (en) * | 2013-08-08 | 2013-11-20 | 宁波海创天下信息科技有限公司 | Bridge displacement monitoring system and bridge displacement monitoring method |
| CN105763614A (en) * | 2016-03-15 | 2016-07-13 | 原胜利 | Civil engineering monitoring system based on wireless communication |
| CN105973627A (en) * | 2016-05-26 | 2016-09-28 | 东南大学 | Long-gauge-length-strain-influence-envelope-based bridge damage identification method |
-
2009
- 2009-05-11 CN CN2009200330542U patent/CN201402217Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551282B (en) * | 2009-05-11 | 2013-06-05 | 长安大学 | Bridge load detecting system based on wireless sensor network |
| CN103148889A (en) * | 2012-12-25 | 2013-06-12 | 中国神华能源股份有限公司 | Bridge detection analysis system and bridge detection analysis method |
| CN103398682A (en) * | 2013-08-08 | 2013-11-20 | 宁波海创天下信息科技有限公司 | Bridge displacement monitoring system and bridge displacement monitoring method |
| CN105763614A (en) * | 2016-03-15 | 2016-07-13 | 原胜利 | Civil engineering monitoring system based on wireless communication |
| CN105973627A (en) * | 2016-05-26 | 2016-09-28 | 东南大学 | Long-gauge-length-strain-influence-envelope-based bridge damage identification method |
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Granted publication date: 20100210 Termination date: 20130511 |