CN109490224B - Concrete pavement slab nondestructive testing device and method based on FBG technology - Google Patents
Concrete pavement slab nondestructive testing device and method based on FBG technology Download PDFInfo
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- CN109490224B CN109490224B CN201811450300.4A CN201811450300A CN109490224B CN 109490224 B CN109490224 B CN 109490224B CN 201811450300 A CN201811450300 A CN 201811450300A CN 109490224 B CN109490224 B CN 109490224B
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Abstract
Disclosed are a concrete pavement slab nondestructive testing device and method based on an FBG technology. The device comprises a mobile carrier, a plurality of acceleration sensors, a fiber bragg grating demodulator, a main control terminal, a load, a telescopic support frame and a pavement disease acquisition instrument, wherein the acceleration sensors, the fiber bragg grating demodulator, the main control terminal, the load, the telescopic support frame and the pavement disease acquisition instrument are arranged on the mobile carrier; one end of the telescopic support frame is fixed in the mobile carrier, and the other end of the telescopic support frame can be placed on the pavement slab; the acceleration sensor and the load-carrying heavy object are both arranged on the telescopic support frame, and the acceleration sensor is connected with the fiber bragg grating demodulator through a lead; the plurality of pavement disease collecting instruments are respectively arranged at the front end and the rear end of the mobile carrier; the fiber grating demodulator and the pavement disease collector are connected with the main control terminal through wires. The invention has the advantages that: the method has the advantages of simple installation process, no need of pre-buried construction, higher accuracy and reliability, and practical significance for large-scale real-time evaluation of the airport concrete pavement.
Description
Technical Field
The invention belongs to the technical field of civil aviation, and particularly relates to a concrete pavement slab nondestructive testing device and method based on an FBG (fiber Bragg Grating) technology.
Background
Airport runways are one of the most important parts of the airport infrastructure, and are responsible for the take-off and landing of aircraft. If the road surface is damaged, the taking-off and landing safety of the airplane is influenced, and even serious accidents occur. In order to avoid accidents, various performances of the pavement slab need to be detected, and corresponding technical bases are provided for pavement management and daily maintenance according to various detected parameters. Currently, the mainstream international pavement inspection technology is nondestructive inspection technology, and nondestructive inspection can be roughly classified into deflection type inspection and non-deflection type inspection. However, the conventional detection techniques are difficult to be completely applied to the detection and evaluation of airport pavement because the measurement time is too long, the coupling is not good, and the manual operation intensity is high. Especially for large international airports, the time for parking is short, so that the time available for pavement detection is shorter, and the detection becomes more difficult as a result.
FBG is a fiber grating with wide application range, and most fiber grating sensors are made of FBG. The measuring method of the sensor is to modulate the light transmitted in the optical fiber to change the characteristics of the transmitted light such as intensity, amplitude, phase, frequency or polarization state, and then modulate the light signal to detect and obtain the physical quantity to be measured. For airport pavement detection, the detection using the fiber grating sensing technology has higher timeliness, can obtain the desired pavement performance parameters in real time, and can greatly save the detection time, thereby reducing the daily maintenance pressure of the pavement and improving the working efficiency. But at present, a concrete pavement slab nondestructive testing method based on the FBG technology is still lacked.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a concrete pavement slab nondestructive testing device and method based on the FBG technology, which have high precision and high timeliness and can be used for rapidly and nondestructively testing the damage of an airport pavement slab.
In order to achieve the purpose, the concrete pavement slab nondestructive testing device based on the FBG technology comprises a mobile carrier, a plurality of acceleration sensors, a fiber bragg grating demodulator, a main control terminal, a load application heavy object, a telescopic support frame and a pavement disease acquisition instrument, wherein the acceleration sensors, the fiber bragg grating demodulator, the main control terminal, the load application heavy object, the telescopic support frame and the pavement disease acquisition instrument are arranged on the mobile carrier; one end of the telescopic support frame is fixed in the mobile carrier, and the other end of the telescopic support frame can be placed on the pavement slab; the acceleration sensor and the load-carrying heavy object are both arranged on the telescopic support frame, and the acceleration sensor is connected with the fiber bragg grating demodulator through a lead; the plurality of pavement disease collecting instruments are respectively arranged at the front end and the rear end of the mobile carrier; the fiber grating demodulator and the pavement disease collector are connected with the main control terminal through wires.
The acceleration sensor adopts an FBG acceleration sensor.
The telescopic support frame comprises a support rod, a telescopic spring and a fixing frame; wherein the lower end of the supporting rod is fixed on a chassis of the mobile carrier; two ends of the expansion spring are respectively connected with the upper end of the supporting rod and the fixed frame; the fixed frame comprises two sensor mounting seats and two connecting springs; the two sensor mounting seats are positioned at two sides, and two ends of the two connecting springs are respectively fixed at two ends of the two sensor mounting seats; each sensor mounting seat is provided with at least one acceleration sensor; the load weight is connected between the two sensor mounting seats through a height-adjustable bracket.
The weight of the load weight is 20 kg.
The pavement disease acquisition instrument is a high-definition image acquisition instrument.
The nondestructive testing method of the concrete pavement slab nondestructive testing device based on the FBG technology comprises the following steps in sequence:
1) the method comprises the steps that various actual disease information of a to-be-detected pavement slab is collected in advance by a pavement disease collector and is transmitted to a main control terminal, the main control terminal classifies the actual disease information, and then finite element simulation analysis is carried out, so that the relationship between the frequency change rate and the damage factor of the pavement slab based on the elastic modulus beta of different disease types is obtained;
2) collecting vibration acceleration data of the loading road panel by using an acceleration sensor;
coating a coupling agent on the surface of an acceleration sensor, then placing a fixed frame on a telescopic support frame, the acceleration sensor and a load on a pavement panel to be detected, adhering the acceleration sensor on the pavement panel to be detected, then adjusting the load to a position 20 cm away from the surface of the pavement panel and freely releasing the load, applying a load on the pavement panel to be detected by using the load, then collecting vibration acceleration data of the pavement panel by using the acceleration sensor under the control of a main control terminal, transmitting the vibration acceleration data to a fiber grating demodulator, and then transmitting the vibration acceleration data to the main control terminal in a wired mode;
3) processing the vibration acceleration data by the main control terminal, and inverting the first-order natural frequency of the to-be-detected road panel;
the main control terminal performs Fourier transform on the acquired vibration acceleration data, converts a time domain signal into a frequency domain signal, and then obtains a first-order natural frequency of the to-be-detected track panel from the frequency domain signal.
4) Calculating a frequency change rate based on the first-order natural frequency of the to-be-detected road panel and the first-order natural frequency of the non-damaged road panel;
calculating the frequency change rate by using a formula (1) according to the first-order natural frequency of the to-be-detected track panel and the first-order natural frequency of the lossless track panel obtained in the previous step, wherein the expression is as follows:
in the formula (f)u-is the first order natural frequency of the lossless track panel;
fd-is the first order natural frequency of the pavement slab to be detected;
5) based on the frequency change rate, inverting the damage factor according to the relationship between the frequency change rate and the damage factor established in the step 1), and judging the damage degree of the to-be-detected road panel
The concrete pavement slab nondestructive testing device and method based on the FBG technology provided by the invention have the following advantages that: the method has the advantages of simple installation process, no need of pre-buried construction, higher accuracy and reliability, and practical significance for large-scale real-time evaluation of the airport concrete pavement.
Drawings
Fig. 1 is a schematic structural view of a concrete pavement slab nondestructive testing device based on FBG technology provided by the present invention.
Fig. 2 is a schematic diagram of a data acquisition process of the concrete pavement slab nondestructive testing method based on the FBG technology provided by the invention.
Fig. 3 is a schematic diagram of the arrangement of sensors in the concrete pavement slab nondestructive testing device based on the FBG technology.
FIG. 4 is a flow chart of the concrete pavement slab nondestructive testing method based on FBG technology provided by the invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1-3, the nondestructive testing device for a concrete pavement slab based on the FBG technology provided by the invention comprises a mobile carrier 7, and a plurality of acceleration sensors 1, a fiber bragg grating demodulator 2, a main control terminal 3, a load-carrying object 4, a telescopic support frame 5 and a pavement disease collector 6 which are arranged on the mobile carrier 7; wherein, one end of the telescopic support frame 5 is fixed in the mobile carrier 7, and the other end can be placed on the road surface plate; the acceleration sensor 1 and the load-carrying object 4 are both arranged on the telescopic support frame 5, and the acceleration sensor 1 is connected with the fiber bragg grating demodulator 2 through a lead; a plurality of pavement disease collection instruments 6 are respectively arranged at the front end and the rear end of the mobile carrier 7; the fiber grating demodulator 2 and the pavement disease collector 6 are both connected with the main control terminal 3 through wires.
The acceleration sensor 1 adopts an FBG acceleration sensor.
The telescopic support frame 5 comprises a support rod 8, a telescopic spring 9 and a fixing frame 10; wherein the lower end of the supporting rod 8 is fixed on the chassis of the mobile carrier 7; two ends of the telescopic spring 9 are respectively connected with the upper end of the supporting rod 8 and the fixed frame 10; the fixing frame 10 comprises two sensor mounting seats 11 and two connecting springs 12; the two sensor mounting seats 11 are positioned at two sides, and two ends of the two connecting springs 12 are respectively fixed at two ends of the two sensor mounting seats 11; one or more acceleration sensors 1 can be installed on each sensor installation seat 11 according to detection requirements; the loading weight 4 is connected between the two sensor mounts 11 by a height-adjustable bracket.
The weight of the load 4 is 20 kg.
The pavement disease acquisition instrument is a high-definition image acquisition instrument.
As shown in fig. 4, the nondestructive testing method using the above nondestructive testing apparatus for a concrete pavement slab based on FBG technology comprises the following steps in sequence:
1) the method comprises the steps that various actual disease information of a to-be-detected pavement slab is collected in advance by a pavement disease collector 6 and is transmitted to a main control terminal 3, the main control terminal 3 classifies the actual disease information, and then finite element simulation analysis is carried out, so that the relationship between the frequency change rate and the damage factor of the elastic modulus beta based on the pavement slab corresponding to different disease types is obtained; the relationship between the frequency change rate of typical disease types and the damage factor is as follows:
2) collecting vibration acceleration data of a loading road panel by using an acceleration sensor 1;
smearing a coupling agent on the surface of an acceleration sensor 1, then placing a fixed frame 10 on a telescopic support frame 5, the acceleration sensor 1 and a load-applying weight 4 on a pavement panel to be detected, pasting the acceleration sensor 1 on the pavement panel to be detected, then adjusting the load-applying weight 4 to a position 20 cm away from the surface of the pavement panel and freely releasing the load-applying weight 4, applying a load on the pavement panel to be detected by using the load-applying weight 4, then acquiring vibration acceleration data of the pavement panel by using the acceleration sensor 1 under the control of a main control terminal 3, transmitting the vibration acceleration data to an optical fiber grating demodulator 2, and then transmitting the vibration acceleration data to the main control terminal 3 in a wired mode;
3) the main control terminal 3 processes the vibration acceleration data and inverts the first-order natural frequency of the to-be-detected road panel;
the main control terminal 3 performs fourier transform on the acquired vibration acceleration data, converts a time domain signal into a frequency domain signal, and then obtains a first-order natural frequency of the to-be-detected track panel from the frequency domain signal.
4) Calculating a frequency change rate based on the first-order natural frequency of the to-be-detected road panel and the first-order natural frequency of the non-damaged road panel;
calculating the frequency change rate by using a formula (1) according to the first-order natural frequency of the to-be-detected track panel and the first-order natural frequency of the lossless track panel obtained in the previous step, wherein the expression is as follows:
in the formula (f)u-is the first order natural frequency of the lossless track panel;
fd-is the first order natural frequency of the pavement slab to be detected;
5) based on the frequency change rate, inverting the damage factor according to the relationship between the frequency change rate and the damage factor established in the step 1), thereby judging the damage degree of the to-be-detected road panel.
Claims (5)
1. The utility model provides a concrete pavement panel nondestructive test device based on FBG technique which characterized in that: the device comprises a mobile carrier (7), a plurality of acceleration sensors (1), a fiber bragg grating demodulator (2), a main control terminal (3), a load application object (4), a telescopic support frame (5) and a pavement disease acquisition instrument (6), wherein the acceleration sensors, the fiber bragg grating demodulator (2), the main control terminal and the load application object are arranged on the mobile carrier (7); one end of the telescopic support frame (5) is fixed in the mobile carrier (7), and the other end of the telescopic support frame can be placed on the pavement slab; the acceleration sensor (1) and the load-carrying heavy object (4) are both arranged on the telescopic support frame (5), and the acceleration sensor (1) is connected with the fiber grating demodulator (2) through a lead; a plurality of pavement disease collecting instruments (6) are respectively arranged at the front end and the rear end of the mobile carrier (7); the fiber grating demodulator (2) and the pavement disease collector (6) are connected with the main control terminal (3) through wires;
the acceleration sensor (1) adopts an FBG acceleration sensor.
2. The nondestructive testing device for concrete pavement slab based on FBG technology as claimed in claim 1, characterized in that: the telescopic support frame (5) comprises a support rod (8), a telescopic spring (9) and a fixing frame (10); wherein the lower end of the supporting rod (8) is fixed on the chassis of the mobile carrier (7); two ends of the telescopic spring (9) are respectively connected with the upper end of the supporting rod (8) and the fixing frame (10); the fixed frame (10) comprises two sensor mounting seats (11) and two connecting springs (12); the two sensor mounting seats (11) are positioned at two sides, and two ends of the two connecting springs (12) are respectively fixed at two ends of the two sensor mounting seats (11); each sensor mounting seat (11) is provided with at least one acceleration sensor (1); the load application weight (4) is connected between the two sensor mounting seats (11) through a height-adjustable bracket.
3. The nondestructive testing device for concrete pavement slab based on FBG technology as claimed in claim 1, characterized in that: the weight of the load weight (4) is 20 kg.
4. The nondestructive testing device for concrete pavement slab based on FBG technology as claimed in claim 1, characterized in that: the pavement disease acquisition instrument (6) is a high-definition image acquisition instrument.
5. A nondestructive testing method using the apparatus for nondestructive testing of concrete pavement slab based on FBG technology of claim 1, characterized in that: the nondestructive testing method comprises the following steps which are carried out in sequence:
1) the method comprises the steps that various actual disease information of a to-be-detected pavement slab is collected in advance by a pavement disease collector (6) and is transmitted to a main control terminal (3), the main control terminal (3) classifies the actual disease information, and then finite element simulation analysis is carried out, so that the relationship between the frequency change rate and the damage factor of the elastic modulus beta based on the pavement slab corresponding to different disease types is obtained;
2) collecting vibration acceleration data of a loading road panel by using an acceleration sensor (1);
smearing a coupling agent on the surface of an acceleration sensor (1), then placing a fixed frame (10) on a telescopic support frame (5) together with the acceleration sensor (1) and a load application weight (4) on a pavement panel to be detected, pasting the acceleration sensor (1) on the pavement panel to be detected, then adjusting the load application weight (4) to a position 20 cm away from the surface of the pavement panel and freely releasing the load application weight, applying a load on the pavement panel to be detected by using the load application weight (4), then collecting vibration acceleration data of the pavement panel by using the acceleration sensor (1) under the control of a main control terminal (3), then transmitting the vibration acceleration data to a fiber grating demodulator (2), and then transmitting the vibration acceleration data to the main control terminal (3) in a wired mode;
3) processing the vibration acceleration data by the main control terminal (3), and inverting the first-order natural frequency of the to-be-detected road panel;
the main control terminal (3) performs Fourier transform on the acquired vibration acceleration data, converts a time domain signal into a frequency domain signal, and then obtains a first-order natural frequency of the to-be-detected road panel from the frequency domain signal;
4) calculating a frequency change rate based on the first-order natural frequency of the to-be-detected road panel and the first-order natural frequency of the non-damaged road panel;
calculating the frequency change rate by using a formula (1) according to the first-order natural frequency of the to-be-detected track panel and the first-order natural frequency of the lossless track panel obtained in the previous step, wherein the expression is as follows:
in the formula (f)u-is the first order natural frequency of the lossless track panel;
fd-is the first order natural frequency of the pavement slab to be detected;
5) based on the frequency change rate, inverting the damage factor according to the relationship between the frequency change rate and the damage factor established in the step 1), thereby judging the damage degree of the to-be-detected road panel.
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| TW200724897A (en) * | 2005-12-16 | 2007-07-01 | Chien-Ching Ma | Sensor for measuring movement of optical fiber grating and method thereof |
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