CN204988220U - Bridge moves amount of deflection measurement system based on ultrasonic wave principle - Google Patents
Bridge moves amount of deflection measurement system based on ultrasonic wave principle Download PDFInfo
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- CN204988220U CN204988220U CN201520733506.3U CN201520733506U CN204988220U CN 204988220 U CN204988220 U CN 204988220U CN 201520733506 U CN201520733506 U CN 201520733506U CN 204988220 U CN204988220 U CN 204988220U
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Abstract
The utility model relates to a bridge moves amount of deflection measurement system based on ultrasonic wave principle belongs to civil engineering field, is applied to structure safety and health monitoring trade. The utility model discloses greatly simplified on -the -spot detection procedures, need not install vibration sensor under the condition of danger, only needed handheld this equipment, aimed at the bridge bottom, set up parameter and sampling time after, gather can, the analysis can be carried out immediately to the data that obtain, has saved the installation of vibration manipulation test, debugs, connects the electricity, when the step.
Description
Technical field
The utility model relates to a kind of bridge dynamic deflection measuring system based on ultrasonic wave principle, belongs to field of civil engineering, is applied to structural safety health monitoring industry.
Background technology
Bridge dynamic deflection is measured by vibration transducer; this technology belongs to the most general proven technique at present; but the method is more loaded down with trivial details and cost is higher relative to operating process; such as need the position of specifying on bridge floor to install vibration transducer, sensor installation needs to rent expensive bridge-checking vehicle etc., also needs corresponding data collecting instrument to carry out data acquisition; needs are protected the sensor at scene and collecting device; need on-the-spot power supply convenient, prevent artificial destruction, steal etc.
Summary of the invention
For above-mentioned problem, the utility model patent solves the loaded down with trivial details problem high with cost of use that vibratory drilling method faces.The utility model adopts ultrasound wave as the transmission medium of vibration, eliminates the step bought with installing vibration transducer, and the utility model adopts ultrasound wave to send, receive, data processing, is stored as the Portable acquiring design of one, greatly simplifies bridge dynamic deflection testing process.
The utility model adopts following technical scheme:
Based on a bridge dynamic deflection measuring system for ultrasonic wave principle, it comprises microcontroller, FPGA controller, analog to digital converter, USB interface, RS232 interface, digital isolation module, ultrasound wave transmitter module, ultrasound wave receiver module, notebook computer;
Microcontroller is connected with FPGA controller, and microcontroller is provided with RS232 interface, and FPGA controller is connected with notebook computer by USB interface;
FPGA controller is connected with ultrasound wave receiver module by analog to digital converter;
FPGA controller is connected with digital isolation module; Numeral isolation module is connected with ultrasound wave transmitter module, ultrasound wave receiver module.
A kind of bridge dynamic deflection measuring method based on ultrasonic wave principle, FPGA controller synthesis modulated signal is launched by ultrasound wave sending module, the waveform of returning through bridge bottom reflection carries out demodulation by ultrasound wave receiver module again and obtains the square wave that dutycycle changes with bridge vibration, and square-wave signal calculates the mistiming of each square wave rising edge again by FPGA controller.
Further, FPGA controller sends modulated signal by ultrasound wave sending module.
Further, modulated signal obtains through ultrasound wave receiver module the square wave that dutycycle changes with bridge vibration.
Further, ultrasound wave sending module and the signal level of ultrasound wave receiver module and the logic level of FPGA controller are isolated by digital isolation module.
Further, notebook computer is configured by the mode of operation of USB interface to microcontroller.
Further, microcontroller and FPGA controller continue data and transmit and logic control.
Further, the restituted signal of ultrasound wave receiver module is carried out sampling and obtains high-precision square-wave signal by analog to digital converter.
The utility model realizes principle: the birth of this system is mainly large in order to the work on the spot amount solving traditional detection bridge dynamic deflection method, and cost is high, the little grade of dirigibility and a low workload that designs, low cost, the intelligent acquisition equipment of high flexibility.
Its main operational principle utilizes ripe ultrasonic ranging principle, in conjunction with the sample mode of the analog to digital converter of imitation electronics, draws the dynamic deflection change of bridge according to sampling thheorem.
Working-flow: the bridge dynamic deflection change calculated according to theoretical value, the sampling rate of setting instrument for intelligently sampling, sampling rate is herein that collecting device is with certain periodic emission equally spaced batch (-type) ultrasonic signal (general ultrasonic frequency is set to 40KHz), this cycle had both been sampling rate, when analyzing bridge dynamic deflection change, the setting of sampling rate must meet the minimum requirements of sampling thheorem.Reflection wave signal can on bridge floor reflection ultrasonic signal, but reflection wave signal carries the amount of deflection variable signal understanding shopping, be equivalent to the cycle transmitted to modulate, can only can show that the amount of deflection of works changes according to the period change amount of reflection wave by collecting device.Because be the collection of short time, and time variations asks is relative quantity, so the change of the velocity of sound will be caused to cause the error of system due to environmental change, so native system precision can reach 1mm.
The beneficial effects of the utility model:
The utility model greatly simplifies on-the-spot detecting step, do not need, under the condition of danger, vibration transducer is installed, only need hand-held equipment, aim at bottom bridge, set parameter and after the sampling time, carry out gathering, the data obtained can be analyzed immediately, eliminate the installation of vibratory drilling method test, debugging, connect electricity, etc. step.
Accompanying drawing explanation
Fig. 1 is the utility model ultrasonic measurement module frame chart;
Fig. 2 is the utility model ultrasonic measurement bridge dynamic deflection schematic diagram;
Fig. 3 is the utility model ultrasonic pulse modulation schematic diagram.
Embodiment
Be described in detail below in conjunction with accompanying drawing 1,2,3 pairs of the utility model:
Based on a bridge dynamic deflection measuring system for ultrasonic wave principle, it comprises microcontroller 1, FPGA controller 2, analog to digital converter 3, USB interface 4, RS232 interface 5, digital isolation module 6, ultrasound wave transmitter module 7, ultrasound wave receiver module 8, notebook computer 9;
Microcontroller 1 is connected with FPGA controller 2, and microcontroller 1 is provided with RS232 interface 5, and FPGA controller 2 is connected with notebook computer 9 by USB interface 4;
FPGA controller 2 is connected with ultrasound wave receiver module 8 by analog to digital converter 3;
FPGA controller 2 is connected with digital isolation module 6; Numeral isolation module 6 is connected with ultrasound wave transmitter module 7, ultrasound wave receiver module 8.
The 2-in-1 one-tenth modulated signal of FPGA controller is launched by ultrasound wave sending module 7, the waveform of returning through bridge bottom reflection carries out demodulation by ultrasound wave receiver module 8 again and obtains the square wave that dutycycle changes with bridge vibration, and square-wave signal calculates the mistiming of each square wave rising edge again by FPGA controller 2.
FPGA controller 1 sends modulated signal by ultrasound wave sending module 7.
Modulated signal obtains through ultrasound wave receiver module 8 square wave that dutycycle changes with bridge vibration.
Ultrasound wave sending module 7 and the signal level of ultrasound wave receiver module 8 and the logic level of FPGA controller 2 are isolated by numeral isolation module 6.
Notebook computer 9 is configured by the mode of operation of USB interface 4 pairs of microcontrollers 1.
Microcontroller 1 and FPGA controller 2 continue data and transmit and logic control.
The restituted signal of ultrasound wave receiver module 8 is carried out sampling and obtains high-precision square-wave signal by analog to digital converter 3.
The high-speed parallel processing power of the utility model patent utilization FPGA, produces the modulation signal of similar sampling rate, and this signal can be configured to different sampling rates according to the fundamental frequency of bridge, is generally 128Hz, 64Hz, 32Hz, 16Hz, 8Hz; FPGA produces the ultrasonic carrier signal of 40KHz simultaneously, obtains modulated signal with modulation signal signal multiplication, sends equally spaced modulated signal by ultrasound wave transmitting probe.FPGA receives reflected signal as the receiving end of modulated signal simultaneously, can detect each mistiming of pulse ultrasonic wave signal after bottom bridge, thus draw relative shift.
When actual measurement, first by the key parameter such as sampling rate, sampling number of notebook computer configuration acquisition module, then aimed at bottom bridge by the ultrasound wave transmitting probe of collecting device, General Requirements distance is within 100 meters.Clicked by notebook computer and start sampling, now device start work, acquisition module sends 1024 pulse ultrasonic wave signals after ovennodulation, signal arrives after bottom bridge and fires back, demodulation is carried out again through hyperacoustic receiving transducer, because time bridge vibrates in the vertical direction, each pulse ultrasonic wave signal arrives bottom bridge not identical by the time of reflecting, thus the mistiming of pulse ultrasonic wave each modulation period of being returned by detection of reflected can draw the change frequency of bridge dynamic deflection, again by calculating the ultrasonic velocity under current environment, the dynamic deflection oscillogram of bridge reality can be drawn.
Because considering the diffuse reflection of bridge, for ensureing the precision of data, therefore the analog to digital converter that have employed high speed in system carries out high-speed sampling, and the data after sampling demodulate the mistiming between each square-wave waveform of accurate modulated signal through algorithm process.
The effect of numeral isolation is because the logic storage battery of FPGA and the different and isolation done of ultrasound wave drive level.
The effect of microcontroller drives USB, RS232 interface, and the working method of control FPGA, carries out the functions such as data communication with FPGA.
In Fig. 2 utility model ultrasonic measurement bridge dynamic deflection schematic diagram: 11 bridges; 12 transmitted waves; 13 reflection waves; 14 ultrasound wave transmitting probes; 15 ultrasound wave receiving transducers; 16 ultrasonic measurement modules.
Fig. 3 is the utility model ultrasonic pulse modulation schematic diagram:
21: modulation signal (according to actual samples rate setting, acquiescence 128Hz);
The transmission waveform (do not contact bridge floor) of ultrasonic carrier signal after ovennodulation of 22:40KHz;
23: the modulated signal (after contact bridge floor) of returning through bridge bottom reflection;
24: the square wave of the change in duty cycle after demodulation.
Brief description: modulated signal, after Crossing the bridge noodles is launched, through receiving circuit demodulation, obtains the square wave that a dutycycle changes with bridge vibration.
The modulated signal that contact bridge floor back reflection is returned, timing from first square wave rising edge ripple letter, calculates the mistiming Δ t between every two square wave rising edges
nwherein n=1,2,3 ... 1024; Draw instant definitely velocity of sound v by temperature at that time, humidity factor again, pass through S
n=v Δ t
nshow that the absolute displacement between each ripple letter is poor, then reference point between with the starting point of first ripple letter being, can depict a horizontal ordinate is time (time of horizontal ordinate is the time interval Ts=1/Fs obtained according to sampling rate Fs), ordinate is the time domain ripple letter of displacement and amount of deflection, by analyzing ripple letter, we can obtain the key messages such as the fundamental frequency of bridge and amount of deflection.
Claims (1)
1. based on a bridge dynamic deflection measuring system for ultrasonic wave principle, it is characterized in that: it comprises microcontroller (1), FPGA controller (2), analog to digital converter (3), USB interface (4), RS232 interface (5), digital isolation module (6), ultrasound wave transmitter module (7), ultrasound wave receiver module (8), notebook computer (9);
Microcontroller (1) is connected with FPGA controller (2), and microcontroller (1) is provided with RS232 interface (5), and FPGA controller (2) is connected with notebook computer (9) by USB interface (4);
FPGA controller (2) is connected with ultrasound wave receiver module (8) by analog to digital converter (3);
FPGA controller (2) is connected with digital isolation module (6); Numeral isolation module (6) is connected with ultrasound wave transmitter module (7), ultrasound wave receiver module (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520733506.3U CN204988220U (en) | 2015-09-22 | 2015-09-22 | Bridge moves amount of deflection measurement system based on ultrasonic wave principle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520733506.3U CN204988220U (en) | 2015-09-22 | 2015-09-22 | Bridge moves amount of deflection measurement system based on ultrasonic wave principle |
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| CN204988220U true CN204988220U (en) | 2016-01-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136075A (en) * | 2015-09-22 | 2015-12-09 | 江西飞尚科技有限公司 | Bridge dynamic deflection measurement system and method based on ultrasonic principle |
| WO2018007790A1 (en) * | 2016-07-08 | 2018-01-11 | Imperial Innovations Limited | An apparatus and method for generating a motional signature indicative of motion of moving parts of a target machine |
| CN116067433A (en) * | 2023-03-07 | 2023-05-05 | 广东智云工程科技有限公司 | Vibration wire data acquisition method and acquisition instrument thereof |
-
2015
- 2015-09-22 CN CN201520733506.3U patent/CN204988220U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136075A (en) * | 2015-09-22 | 2015-12-09 | 江西飞尚科技有限公司 | Bridge dynamic deflection measurement system and method based on ultrasonic principle |
| WO2018007790A1 (en) * | 2016-07-08 | 2018-01-11 | Imperial Innovations Limited | An apparatus and method for generating a motional signature indicative of motion of moving parts of a target machine |
| JP2019525156A (en) * | 2016-07-08 | 2019-09-05 | アイピー２アイピーオー イノベーションズ リミテッドＩｐ２Ｉｐｏ Ｉｎｎｏｖａｔｉｏｎｓ Ｌｉｍｉｔｅｄ | Apparatus and method for generating a motion signature indicative of motion of a moving part of a target machine |
| US10809149B2 (en) | 2016-07-08 | 2020-10-20 | Imperial College Innovations Limited | Apparatus and method for generating a motional signature indicative of motion of moving parts of a target machine |
| CN116067433A (en) * | 2023-03-07 | 2023-05-05 | 广东智云工程科技有限公司 | Vibration wire data acquisition method and acquisition instrument thereof |
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