CN204066362U - Based on the bridge strain monitoring system of wireless communication technology - Google Patents
Based on the bridge strain monitoring system of wireless communication technology Download PDFInfo
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- CN204066362U CN204066362U CN201420353358.8U CN201420353358U CN204066362U CN 204066362 U CN204066362 U CN 204066362U CN 201420353358 U CN201420353358 U CN 201420353358U CN 204066362 U CN204066362 U CN 204066362U
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Abstract
The utility model discloses a kind of bridge strain monitoring system based on wireless communication technology, described system comprises and is multiplely arranged on the vibrating string type strain transducer of bridge base plate or web surface, multiple type vibration wire readout instrument, receiver and computing machine; Described multiple type vibration wire readout instrument is connected one to one by wire and multiple vibrating string type strain transducer, and described receiver is connected with computing machine by interface circuit; Described each type vibration wire readout instrument is connected with the first wireless communication module, and described receiver is connected with the second wireless communication module, and described first wireless communication module and the second wireless communication module form wireless sensor network jointly.Bridge strain monitoring system structure of the present utility model is simple, dispose flexible, do not limit by terrain environment, avoid the shortcoming of laying cable mode, can save a large amount of manpower and materials, data acquisition is carried out automatically, without the need to carrying out manual intervention, the real-time not only gathered is secure, also easily realizes long-term dynamics monitoring.
Description
Technical field
The utility model relates to a kind of bridge strain monitoring system, and especially a kind of bridge strain monitoring system based on wireless communication technology, belongs to civil engineering work strain monitoring field.
Background technology
Static strain measurement is the important content of bridge static loading test, and static strain directly reflects the local pressure situation under the effect of bridge outer load, the important parameter of bridge structure health state and the important indicator of bridge safty assessment, therefore, in bridge construction, operation, maintenance, by the Real-Time Monitoring strained bridge, significant to the health status of evaluation bridge structure.
In current engineering monitoring, usually successively data acquisition carried out to multiple control point by survey crew Usage data collection instrument and note down, the pre-buried point of every sensor all needs sensor wire to access Acquisition Instrument, perform data acquisition again, the shortcoming of this mode is complicated operation, and artificial acquisition cost is high.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, provides a kind of structure simple, disposes flexibly, and the bridge strain monitoring system based on wireless communication technology that data acquisition is carried out automatically.
The purpose of this utility model can reach by taking following technical scheme:
Based on the bridge strain monitoring system of wireless communication technology, comprise and be multiplely arranged on the vibrating string type strain transducer of bridge base plate or web surface, multiple type vibration wire readout instrument, receiver and computing machine; Described multiple type vibration wire readout instrument is connected one to one by wire and multiple vibrating string type strain transducer, and described receiver is connected with computing machine by interface circuit; Described each type vibration wire readout instrument is connected with the first wireless communication module, and described receiver is connected with the second wireless communication module, and described first wireless communication module and the second wireless communication module form wireless sensor network jointly.
As a kind of preferred version, described each type vibration wire readout instrument comprises data acquisition module, the first single-chip microcomputer and supply module, described supply module is used for providing power supply for the first single-chip microcomputer, described data acquisition module is connected with vibrating string type strain transducer, and described first single-chip microcomputer is connected with data acquisition module and the first wireless communication module respectively.
As a kind of preferred version, described data acquisition module comprises high pressure activation circuit and signal conditioning circuit, described high pressure activation circuit is used for initiating electric magnetization to vibrating string type strain transducer, and described signal conditioning circuit is used for amplifying the output signal of vibrating string type strain transducer, rectification and filtering process.
As a kind of preferred version, described first single-chip microcomputer adopts ATMEGA8A chip.
As a kind of preferred version, described supply module adopts 3.7V lithium battery.
As a kind of preferred version, described receiver comprises second singlechip, RS232 interface circuit and RS232 and turns usb circuit, described second singlechip turns usb circuit by RS232 interface circuit with RS232 successively and is connected with computing machine, and described second singlechip is also connected with the second wireless communication module.
As a kind of preferred version, described second singlechip adopts STM32F103 chip, described RS232 interface circuit adopts MAX3232 chip, the USART2 Interference fit I/O interface of STM32F103 chip forms the control interface of the second wireless communication module together, and USART1 interface is drawn by MAX3232 chip and picks out RS232C interface.
As a kind of preferred version, described first wireless communication module and the second wireless communication module all adopt UTC4432B1 wireless communication module.
The utility model has following beneficial effect relative to prior art:
1, bridge strain monitoring system structure of the present utility model is simple, disposes flexible, does not limit by terrain environment, avoid the shortcoming of laying cable mode, can save a large amount of manpower and materials.
2, bridge strain monitoring system of the present utility model utilizes vibrating string type strain transducer and type vibration wire readout instrument to realize data acquisition, and automatically the data of collection are transferred to computing machine through receiver by wireless communication module, without the need to carrying out manual intervention, the real-time not only gathered is secure, also easily realizes long-term dynamics monitoring.
3, bridge strain monitoring system of the present utility model by data automatically stored in computing machine after, can real time inspection data variation trend curve in a computer, abnormal data alarm can be realized, be beneficial to date comprision, significantly can alleviate the workload of data processing.
Accompanying drawing explanation
Fig. 1 is the bridge strain monitoring system structural representation based on wireless communication technology of the present utility model.
Fig. 2 of the present utility modelly arranges schematic diagram based on vibrating string type strain transducer position in the bridge strain monitoring system of wireless communication technology.
Fig. 3 is of the present utility model based on vibrating string type strain transducer principle of work schematic diagram in the bridge strain monitoring system of wireless communication technology.
Fig. 4 is the structural principle block diagram based on type vibration wire readout instrument in the bridge strain monitoring system of wireless communication technology of the present utility model.
Fig. 5 is the bridge strain monitoring system mesohigh exciting circuit schematic diagram based on wireless communication technology of the present utility model.
Fig. 6 is of the present utility model based on signal conditioning circuit schematic diagram in the bridge strain monitoring system of wireless communication technology.
Fig. 7 is the structural principle block diagram based on receiver in the bridge strain monitoring system of wireless communication technology of the present utility model.
Wherein, 1-vibrating string type strain transducer, 2-type vibration wire readout instrument, 3-receiver, 4-computing machine, 5-first wireless communication module, 6-second wireless communication module, 7-string wire, 8-inductive coil, 9-single coil excitement, 10-data acquisition module, 11-first single-chip microcomputer, 12-supply module, 13-second singlechip, 14-RS232 interface circuit, 15-RS232 turns usb circuit.
Embodiment
Embodiment 1:
As shown in Figure 1, the bridge strain monitoring system based on wireless communication technology of the present embodiment, comprises multiple vibrating string type strain transducer 1, multiple type vibration wire readout instrument 2, receiver 3 and computing machine 4; Described multiple type vibration wire readout instrument 2 is connected one to one by wire and multiple vibrating string type strain transducer 1, and described receiver 3 is connected with computing machine 4 by interface circuit; Described each type vibration wire readout instrument 2 is connected with the first wireless communication module 5, and described receiver 3 is connected with the second wireless communication module 6, and described first wireless communication module 5 and the second wireless communication module 6 form wireless sensor network jointly, wherein:
As shown in Figure 2, described vibrating string type strain transducer 1 can be arranged on bridge base plate or web surface, it adopts BGK-4000 type vibrating string extensometer, principle of work as shown in Figure 3, can see that vibrating string type sensor inside is the string wire 7 of a tensioning, being placed among electromagnetic field. exciting current makes magnet magnetic enhancement by magnet coil and holds vibratory string, after electric current disconnects, due to inertia effect, string wire 7 starts free vibration, the induction electromotive force that inductive coil 8 produces, export through amplifying, and by voltage comparator, output signal is converted into frequency signal, the frequency of the induction electromotive force surveyed is the vibration frequency of vibratory string, simultaneously, a part for output signal will feed back to single coil excitement 9, add the fixed ampllitude measure of circuit, and the constant amplitude making string wire 7 reach circuit to keep, continuous print vibrate, as long as measure the vibration frequency of string wire 7, just strain can be obtained by the physical relation of the frequency of string wire 7 and strain, the pass of frequency and strain is:
In formula, f is string wire vibration frequency, and l is string wire length, and ρ is string of a musical instrument density, and s is string cross-sectional area, ρ
vfor the volume density (ρ of string
v=ρ/s), T is string wire pulling force, and σ is string stress, and ε is string strain, and E is string elastic modulus.
Described type vibration wire readout instrument 2 is for completing the frequency measurement of vibrating string type strain transducer 1, each type vibration wire readout instrument 2 as shown in Figure 4, comprise data acquisition module 10, first single-chip microcomputer 11 and supply module 12, wherein data acquisition module 10 comprises high pressure activation circuit and signal conditioning circuit, described high pressure activation circuit is connected with vibrating string type strain transducer 1 respectively with signal conditioning circuit, first single-chip microcomputer 11 adopts the ATMEGA8A singlechip chip of Atmel company, respectively with high pressure activation circuit, signal conditioning circuit and the first wireless communication module 5, supply module 12 adopts 3.7V lithium battery, for providing power supply for the first single-chip microcomputer 11, the principle of work of type vibration wire readout instrument 2 is specially: type vibration wire readout instrument 2 is by the instruction of the first wireless communication module 5 receiving computer 4, high pressure activation circuit is controlled (as shown in Figure 5 by the first single-chip microcomputer 11 output pwm signal, T1, T2 and T3 tri-high-voltage three-pole pipe parallel connections can obtain larger electric current, comparer U1A indicator signal when high pressure reaches predetermined threshold value inputs the first single-chip microcomputer 11) obtain the pulse high-voltage of 150V ~ 180V, then the first single-chip microcomputer 11 is by the two ends of this voltage-drop loading to vibrating string type strain transducer 1, vibrating string type strain transducer 1 is made to start damped oscillation and output voltage signal by the excitation of high-voltage pulse, the frequency of its output signal is determined by vibrating string type strain transducer 1 stress intensity, signal conditioning circuit (as shown in Figure 6) output signal to vibrating string type strain transducer 1 is amplified, rectification and filtering process, obtain the square-wave signal of certain frequency, the timer collection square-wave signal that first single-chip microcomputer 11 is built-in, and through calculating frequency values.
As shown in Figure 7, described receiver 3 comprises second singlechip 13, RS232 interface circuit 14 and RS232 and turns usb circuit 15, described second singlechip 13 adopts 32 singlechip chip STM32F103 of ST (ST Microelectronics), described RS232 interface circuit 14 adopts MAX3232 chip, the specific I/O interface of USART2 Interference fit of STM32F103 chip forms the control interface of the second wireless communication module 6 together, is connected with the second wireless communication module 6 by control interface; The USART1 interface of STM32F103 chip is drawn by MAX3232 chip and picks out RS232C interface, and turns usb circuit 15 by RS232 and be connected with computing machine 4, carries out serial communication with computing machine 4.
The UTC4432B1 wireless communication module that described first wireless communication module 5 and the second wireless communication module 6 all adopt Hangzhou Wei Bu scientific & technical corporation to produce.
The monitoring method of the bridge strain monitoring system based on wireless communication technology of the present embodiment, comprises the following steps:
1) receiver 3 obtains power supply from the USB interface of computing machine 4, and voltage is exported to second singlechip 13 and the second wireless communication module 6, and second singlechip 13 and the second wireless communication module 6 are normally worked;
2) after type vibration wire readout instrument 2 is energized, by the instruction of the first wireless communication module 5 receiving computer 4, the pulse high-voltage that high pressure activation circuit obtains 150V ~ 180V is controlled by the first single-chip microcomputer 11 output pwm signal, then the first single-chip microcomputer 11 is by the two ends of this voltage-drop loading to vibrating string type strain transducer 1, vibrating string type strain transducer 1 is made to start damped oscillation and output voltage signal by the excitation of high-voltage pulse, the output signal of signal conditioning circuit to vibrating string type strain transducer 1 is amplified, rectification and filtering process, obtain the square-wave signal of certain frequency, the timer collection square-wave signal that first single-chip microcomputer 11 is built-in, and through calculating frequency values,
3) frequency values is transferred to the second wireless communication module 6 by the first wireless communication module 5 by the first single-chip microcomputer 11, then frequency values is transferred to the second singlechip 13 of receiver 3 by the second wireless communication module 6;
4) second singlechip 13 starts A/D converter and the frequency values received is carried out analog to digital conversion, data after conversion pass to RS232 via RS232 interface circuit 14 and turn usb circuit 15, turned after usb circuit 15 converts usb data to be transferred to computing machine 4 by RS232;
5) real time inspection data variation trend curve in computing machine 4, is analyzed data, realizes abnormal data and reports to the police.
In sum, bridge strain monitoring system of the present utility model utilizes vibrating string type strain transducer and type vibration wire readout instrument to realize data acquisition, and automatically the data of collection are transferred to computing machine through receiver by wireless communication module, without the need to carrying out manual intervention, the real-time not only gathered is secure, also easily realizes long-term dynamics monitoring.
The above; be only the utility model patent preferred embodiment; but the protection domain of the utility model patent is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in the utility model patent; be equal to according to the technical scheme of the utility model patent and utility model design thereof and replaced or change, all belonged to the protection domain of the utility model patent.
Claims (8)
1. based on the bridge strain monitoring system of wireless communication technology, it is characterized in that: comprise and be multiplely arranged on the vibrating string type strain transducer of bridge base plate or web surface, multiple type vibration wire readout instrument, receiver and computing machine; Described multiple type vibration wire readout instrument is connected one to one by wire and multiple vibrating string type strain transducer, and described receiver is connected with computing machine by interface circuit; Described each type vibration wire readout instrument is connected with the first wireless communication module, and described receiver is connected with the second wireless communication module, and described first wireless communication module and the second wireless communication module form wireless sensor network jointly.
2. the bridge strain monitoring system based on wireless communication technology according to claim 1, it is characterized in that: described each type vibration wire readout instrument comprises data acquisition module, the first single-chip microcomputer and supply module, described supply module is used for providing power supply for the first single-chip microcomputer, described data acquisition module is connected with vibrating string type strain transducer, and described first single-chip microcomputer is connected with data acquisition module and the first wireless communication module respectively.
3. the bridge strain monitoring system based on wireless communication technology according to claim 2, it is characterized in that: described data acquisition module comprises high pressure activation circuit and signal conditioning circuit, described high pressure activation circuit is used for initiating electric magnetization to vibrating string type strain transducer, and described signal conditioning circuit is used for amplifying the output signal of vibrating string type strain transducer, rectification and filtering process.
4. the bridge strain monitoring system based on wireless communication technology according to claim 2, is characterized in that: described first single-chip microcomputer adopts ATMEGA8A chip.
5. the bridge strain monitoring system based on wireless communication technology according to claim 2, is characterized in that: described supply module adopts 3.7V lithium battery.
6. the bridge strain monitoring system based on wireless communication technology according to claim 1, it is characterized in that: described receiver comprises second singlechip, RS232 interface circuit and RS232 and turns usb circuit, described second singlechip turns usb circuit by RS232 interface circuit with RS232 successively and is connected with computing machine, and described second singlechip is also connected with the second wireless communication module.
7. the bridge strain monitoring system based on wireless communication technology according to claim 6, it is characterized in that: described second singlechip adopts STM32F103 chip, described RS232 interface circuit adopts MAX3232 chip, the USART2 Interference fit I/O interface of STM32F103 chip forms the control interface of the second wireless communication module together, and USART1 interface is drawn by MAX3232 chip and picks out RS232C interface.
8. the bridge strain monitoring system based on wireless communication technology according to claim 1, is characterized in that: described first wireless communication module and the second wireless communication module all adopt UTC4432B1 wireless communication module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104091430A (en) * | 2014-06-26 | 2014-10-08 | 华南理工大学 | Wireless communication technology-based bridge strain monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104091430A (en) * | 2014-06-26 | 2014-10-08 | 华南理工大学 | Wireless communication technology-based bridge strain monitoring system and method |
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