CN115164967A - Drop hammer type deflectometer integral calibration method and system based on laser vibration measurement - Google Patents
Drop hammer type deflectometer integral calibration method and system based on laser vibration measurement Download PDFInfo
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- CN115164967A CN115164967A CN202210801831.3A CN202210801831A CN115164967A CN 115164967 A CN115164967 A CN 115164967A CN 202210801831 A CN202210801831 A CN 202210801831A CN 115164967 A CN115164967 A CN 115164967A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
Abstract
The invention relates to a method and a system for integrally calibrating a drop hammer type deflectometer based on laser vibration measurement, wherein the method comprises the following steps: calibration of components in the FWD/HWD test equipment: respectively carrying out absolute calibration and relative calibration on each sensor in the assembly; overall calibration of FWD/HWD test equipment: and simulating the working environment of the FWD/HWD test equipment under the multi-working condition, and calibrating the test results under different working environments. The method and the device can calibrate the accuracy of the FWD/HWD test equipment, reduce the system error of the whole FWD/HWD calibration, improve the precision of the whole FWD/HWD calibration and improve the applicability of the whole FWD/HWD calibration.
Description
Technical Field
The invention relates to calibration of components in pavement FWD/HWD testing equipment, in particular to a method and a system for integrally calibrating a falling weight deflectometer based on laser vibration measurement.
Background
The airport pavement is a structure for directly supporting the take-off, landing, sliding and parking of the airplane and is very important to the ground operation safety and efficiency of the airplane. Therefore, regulations for the safety management of transport airport operations (CCAR-140-R1) by the China civil aviation administration explicitly require: airport authorities should ensure that the runway, taxiways, and apron surfaces are always in an airworthiness state; performing an analytical study of the condition of the flight area at least once a year; comprehensively evaluating the conditions of the runway, the taxiway and the apron pavement every five years at least; runway friction coefficients should be tested periodically (for runway daily aircraft landing shelves greater than 210 shelves, friction coefficient testing frequency is not less than once per week).
The three core internal contents of the airport pavement airworthiness safety test comprise structural performance, anti-slip performance and flatness, and corresponding mainstream test equipment is a drop hammer/weight hammer deflectometer (FWD/HWD), a runway friction coefficient test vehicle, a vehicle-mounted laser flatness meter and the like. However, in the pavement test, the pavement test apparatus has the following problems: 1. the technical performances of the similar devices are different, and the difference of the test results is obvious; 2. the performance of the same device gradually decays along with the increase of the service life, so that the test result is inconsistent before and after the test result, and the time variation is prominent. The root of the above problems is the lack of necessary technical calibration and data correction for the associated test equipment. Therefore, how to calibrate the components of the runway surface FWD/HWD testing equipment has important significance for airworthiness safety testing of the airport runway surface.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the integral calibration method and the system of the drop hammer type deflectometer based on laser vibration measurement.
The technical scheme adopted for realizing the aim of the invention is a drop hammer type deflectometer integral calibration method based on laser vibration measurement, which comprises the following steps:
calibration of components in the FWD/HWD test equipment: respectively carrying out absolute calibration and relative calibration on each sensor in the assembly;
overall calibration of FWD/HWD test equipment: and simulating the working environment of the FWD/HWD test equipment under the multi-working condition, and calibrating the test results under different working environments.
In the above technical solution, the absolute calibration is to detect the accuracy of each sensor; and the relative calibration is to perform deviation and variance analysis according to the data distribution condition of each group of sensors in the test data sequence and detect whether abnormal sensors exist.
In the above technical solution, the sensor includes a deflection sensor, a load sensor, a temperature sensor, and a distance sensor.
In the technical scheme, the deflection value and the waveform curve of the test point position of the deflection sensor in the loading process are obtained through the laser vibration meter of the laser vibration meter, and the measured deflection value is corrected by twice integrating the acceleration of the deflection sensor.
In the technical scheme, the modulus range and classification of the road slab for the calibration test of the FWD/HWD test equipment are controlled by adjusting the structural thickness, the aggregate formula and the type variable of the basic filler, so that the road slab is suitable for different types of FWD/HWD test equipment.
In the above technical solution, the overall calibration specifically includes controlling the structural parameters, the temperature and the humidity, and other environmental parameters of the test road panel. Carrying out multiple step-by-step loading tests under standard working conditions, acquiring a sensor data curve changing along with the load, and fitting and analyzing calibration factors by using the programmed calculation software; and adjusting working conditions, repeating the calibration test, and realizing multivariable adjustable and controllable FWD/HWD integral calibration.
In addition, the invention also provides a falling weight deflectometer integral calibration system based on laser vibration measurement, and the platform comprises:
the laser vibration meter is used for acquiring a deflection value and a waveform curve of a test point position of the deflection sensor in the loading process;
the vibration sensor is used for monitoring the stability of the laser vibrometer in real time;
the data acquisition module is used for acquiring data of each sensor in the assembly, road panel and environment data and acquiring data of a laser vibration meter and a vibration sensor of the laser vibration meter;
and the detection computer is connected with the data acquisition module and is used for calculating and analyzing whether the calibration result is qualified or not according to the acquired data.
Furthermore, flexible isolation belts for vibration response are arranged around the calibration platform.
The invention has the following advantages: based on calibration of each component of the FWD/HWD test equipment, the system error of the whole FWD/HWD calibration is reduced; the accuracy of the whole FWD/HWD calibration is improved based on a non-contact deflection truth value acquisition technology; based on the standard plate structure variable control technology, the applicability of the whole FWD/HWD calibration is improved.
Drawings
Fig. 1 is a schematic flow chart of the method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement.
Fig. 2 is a schematic structural diagram of the integral calibration system of the drop hammer type deflectometer based on laser vibration measurement.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the method for integrally calibrating a drop hammer deflectometer based on laser vibration measurement comprises the following steps:
s1, calibrating components in FWD/HWD testing equipment: respectively carrying out absolute calibration and relative calibration on each sensor in the assembly; the absolute calibration is used for detecting the accuracy of each sensor; and the relative calibration is to perform deviation and variance analysis according to the data distribution condition of each group of sensors in the test data sequence and detect whether abnormal sensors exist. The sensor comprises a deflection sensor, a load sensor, a temperature sensor and a distance sensor. The deflection value and the waveform curve of the test point position of the deflection sensor in the loading process are obtained through the laser vibration meter of the laser vibration meter, and the secondary integration of the acceleration of the deflection sensor is used for correcting the deflection measurement value (the velocity can be used for carrying out primary integration during implementation). In the step, based on the calibration of each component of the FWD/HWD test equipment, the system error of the whole FWD/HWD calibration is reduced; and the accuracy of the whole FWD/HWD calibration is improved based on a non-contact deflection truth value acquisition technology.
S2, overall calibration of FWD/HWD test equipment: and simulating the working environment of the FWD/HWD test equipment under the multi-working condition, and calibrating the test results under different working environments. The method specifically comprises the steps of controlling the structural parameters, the temperature and the humidity and other environmental parameters of the test road panel. Carrying out multiple step-by-step loading tests under standard working conditions, acquiring a sensor data curve changing along with the load, and fitting and analyzing a calibration factor by using compiled calculation software; and adjusting working conditions, repeating the calibration test, and realizing multivariable adjustable and controllable FWD/HWD integral calibration.
As a preferred embodiment of the invention, the standard FWD/HWD test equipment can be firstly used for calibration in various environments with different working conditions to obtain the standard calibration value R 0 ，R 0 ＝Z 0 ·T 0 ·V 0 ，Z 0 As a structural parameter of the pavement slab, T 0 As an environmental parameter, V 0 For data detected by the sensor, to obtain more samples, Z 0 、T 0 、V 0 And selecting more data as a sample as much as possible to meet the possible working conditions in the actual calibration process, and finally making the calibration values obtained under various working conditions into a standard calibration table.
When the calibration is carried out in practice, the actual calibration value R is obtained X Then, find out the standard calibration value R under the working condition from the standard calibration table 0 Finally, calculating R X And R 0 Correlation coefficient of (d):
if the correlation coefficient R is within the threshold range, the calibration is qualified, if the correlation coefficient R exceeds the threshold range, the calibration is unqualified, and the threshold can be calculated according to the requirement of road surface safety.
The working condition in the standard calibration table may be greatly different from the actual working condition, so that a large error occurs in the correlation coefficient R. In order to further improve the calibration accuracy, during calibration, the FWD/HWD test device to be calibrated and a standard FWD/HWD test device may pass through the calibration platform in sequence, and the obtained R may be obtained x ' and R 0 'calculating a correlation coefficient R' according to the formula, and finally calculating the similarity of R and R ', wherein if the similarity of R and R' is within a specified threshold value range, the calibration of the equipment is qualified.
In the invention, the modulus range and the classification of the road surface plate for the calibration test of the FWD/HWD test equipment are controlled by adjusting the structure thickness, the aggregate allocation and the type variable of the basic filler, so that the road surface plate is suitable for the FWD/HWD test equipment with different models.
The cross-sectional schematic diagram of the calibration system for the road surface FWD/HWD test equipment, which is arranged on an actual detection site and is disclosed by the invention, is shown in figure 2, and the calibration system comprises: the system comprises a laser vibrometer, a vibration sensor, a data collection module and a detection computer, wherein the laser vibrometer is used for acquiring a deflection value and a waveform curve of a test point position of the deflection sensor in the loading process; the vibration sensor is used for monitoring the stability of the laser vibration meter in real time; the data acquisition module is used for acquiring data of each sensor in the assembly, road panel and environment data and acquiring data of the laser vibrometer and the vibration sensor; the detection computer is connected with the data acquisition module and is used for calculating and analyzing whether the calibration result is qualified or not according to the acquired data.
In the embodiment, the fixed cantilever beam is used for mounting the laser vibrometer, and the periphery of the calibration test platform is provided with the vibration-responsive flexible isolation belts and the like, so that the vibration diffusion of the calibration test platform in the loading process is eliminated; and the stability of the laser vibrometer is monitored in real time through the vibration sensor.
Claims (10)
1. A drop hammer deflectometer integral calibration method based on laser vibration measurement is characterized by comprising the following steps:
calibration of components in the FWD/HWD test equipment: respectively carrying out absolute calibration and relative calibration on each sensor in the assembly;
overall calibration of FWD/HWD test equipment: and simulating the working environment of the FWD/HWD test equipment under the multi-working condition, and calibrating the test results under different working environments.
2. The method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement according to claim 1, which is characterized in that: the absolute calibration is used for detecting the precision of each sensor; and the relative calibration is to perform deviation and variance analysis according to the data distribution condition of each group of sensors in the test data sequence and detect whether abnormal sensors exist.
3. The method for integrally calibrating the drop hammer type deflectometer based on laser vibration measurement according to claim 2, which is characterized in that: the sensor comprises a deflection sensor, a load sensor, a temperature sensor and a distance sensor.
4. The method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement according to claim 3, which is characterized in that: and acquiring a deflection value and a waveform curve of a test point position of the deflection sensor in the loading process through a laser vibration meter, and correcting the deflection measured value by twice integrating the acceleration of the deflection sensor.
5. The method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement according to claim 4, which is characterized in that: the modulus range and the grading of the road slab for the calibration test of the FWD/HWD test equipment are controlled by adjusting the structural thickness, the aggregate formula and the type variable of the basic filler, so that the road slab is suitable for different types of FWD/HWD test equipment.
6. The method for integrally calibrating the drop hammer type deflectometer based on laser vibration measurement according to claim 5, wherein the method comprises the following steps: the integral calibration specifically comprises the steps of controlling structural parameters and environmental parameters of a test road panel, carrying out multiple step-by-step loading tests under standard working conditions, obtaining a sensor data curve changing along with loads, and fitting and analyzing calibration factors by using compiled calculation software; and adjusting working conditions, repeating the calibration test, and realizing multivariable adjustable and controllable FWD/HWD integral calibration.
7. The method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement according to claim 6, which is characterized in that:
calculating the calibration value R of actual detection X Calibrated with a standard value R 0 Correlation coefficient of (d):
if the correlation coefficient is within the threshold range, the calibration is qualified, and if the correlation coefficient exceeds the threshold range, the calibration is unqualified;
in the formula, R 0 ＝Z 0 ·T 0 ·V 0 ，Z 0 As a structural parameter of the pavement slab, T 0 As an environmental parameter, V 0 Is the data detected by the sensor.
8. The method for integrally calibrating the drop hammer deflectometer based on laser vibration measurement according to claim 7, which is characterized in that: sequentially passing FWD/HWD test equipment to be calibrated and standard FWD/HWD test equipment through a calibration platform to obtain R x ' and R 0 And calculating a correlation coefficient R ', and finally calculating the similarity of R and R ', wherein if the similarity of R and R ' is in a specified threshold range, the calibration of the equipment is qualified.
9. The utility model provides a whole calibration system of formula of falling weight deflectometer based on laser vibration measurement which characterized in that includes:
the laser vibration meter is used for acquiring a deflection value and a waveform curve of a test point position of the deflection sensor in the loading process;
the vibration sensor is used for monitoring the stability of the laser vibration meter in real time;
the data acquisition module is used for acquiring data of each sensor in the assembly, road panel and environment data, and acquiring data of the laser vibrometer and the vibration sensor;
and the detection computer is connected with the data acquisition module and is used for calculating and analyzing whether the calibration result is qualified or not according to the acquired data.
10. The integral calibration system of the drop hammer type deflectometer based on the laser vibration measurement is characterized in that: and flexible isolation belts with vibration response are arranged around the calibration platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210801831.3A CN115164967A (en) | 2022-07-07 | 2022-07-07 | Drop hammer type deflectometer integral calibration method and system based on laser vibration measurement |
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| CN202210801831.3A CN115164967A (en) | 2022-07-07 | 2022-07-07 | Drop hammer type deflectometer integral calibration method and system based on laser vibration measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979157A (en) * | 2022-12-31 | 2023-04-18 | 同济大学 | Road surface structure performance evaluation method and system based on remote laser vibration measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115979157A (en) * | 2022-12-31 | 2023-04-18 | 同济大学 | Road surface structure performance evaluation method and system based on remote laser vibration measurement |
| CN115979157B (en) * | 2022-12-31 | 2023-09-12 | 同济大学 | Method and system for evaluating pavement structure performance based on remote laser vibration measurement |
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Inventor after: Ling Jianming Inventor after: Tian Yu Inventor after: Zhao Hongduo Inventor after: Li Lingjie Inventor after: Zhao Xindong Inventor after: Liu Shifu Inventor after: Yang Ge Inventor after: Du Hao Inventor before: Tian Yu Inventor before: Ling Jianming Inventor before: Zhao Hongduo Inventor before: Li Lingjie Inventor before: Zhao Xindong Inventor before: Liu Shifu Inventor before: Yang Ge Inventor before: Du Hao |