Small volume laser dynamic deflection rapid detection method

Abstract

The present application relates to the technical field of pavement deflection detection, and provides a small-volume laser dynamic deflection rapid detection method, comprising: acquiring first pavement deformation velocities of multiple measuring points with horizontal distances from a load center within a first distance range; acquiring second pavement deformation velocities of reference measuring points with horizontal distances from the load center within a second distance range, the reference measuring points being located in a deflection basin area; calculating difference values of the first pavement deformation velocities and the second pavement deformation velocities; and inverting pavement deflection values based on the difference values; wherein the pavement deformation velocities of the measuring points are measured by velocity meters installed on a same rigid beam, and the rigid beam is installed in a measuring vehicle. Since the reference measuring points are in the deflection basin area, the velocity meters corresponding to the reference measuring points are also in the deflection basin area during measurement, the velocity meters corresponding to the multiple measuring points are relatively close, a shorter rigid beam and a smaller measuring vehicle can be used, and thus the rapid deflection detection of the small-volume vehicle is realized.

Description

Technical Field

[0001] This invention relates to the field of road deflection detection technology, and in particular to a rapid method for detecting dynamic deflection using a small-volume laser. Background Technology

[0002] Road surface deflection is used to characterize the overall bearing capacity of highway subgrade and pavement, playing a crucial role in road maintenance decisions. Traditional deflection measurement equipment includes the Benkelman beam and the falling weight deflectometer (FWD). These devices can only measure discrete points, have a measurement speed of 1-3 km / h, disrupt traffic during measurement, and pose significant safety hazards. Road maintenance decisions require short-term deflection measurements of the road network, making rapid deflection measurement technology both urgent and necessary.

[0003] There are two possible methods for rapid deflection measurement:

[0004] One approach uses a force-displacement method, with representative products including RWD (Rolling Wheel Deflectometer), RDT (Road Deflection Tester, Swedish RDT), and RDD (Rolling Dynamic Deflectometer). These measurement methods have achieved some success in the experimental stage, but have not been applied in actual engineering.

[0005] Another method is deflection measurement based on road deformation rate. Representative products include Greenwood's TSD (Traffic Speed ​​Deflectometer) and HSD (High Speed ​​Deflectograph) and Zoyon's LDD (Laser Dynamic Deflectometer). This detection method has been applied to some extent in practical engineering.

[0006] Current deflection measurement methods based on pavement deformation rate require the installation of a reference velocimeter outside the deflection basin. This means the reference velocimeter must correspond to a measurement point where there is no pavement deformation rate. Different pavement types have different deflection basin radii. High-grade road design specifications stipulate that the pavement deflection basin radius should be within 4 meters. This implies that the influence range of pavement deformation under load is within 4 meters of the load point, and areas outside this range are considered to have no deformation rate. In existing deflection measurement methods based on pavement deformation rate, the reference velocimeter is typically installed at a horizontal distance of 3.6 meters from the load center. This method results in a long measurement vehicle (usually using a tractor-trailer combination), severely impacting the equipment's accessibility (e.g., height restrictions, traffic restrictions), significantly limiting its usability and increasing operating costs (limited application scenarios, high rate of empty runs during actual testing). Therefore, there is an urgent need to design a rapid deflection detection method based on a small-volume vehicle. Summary of the Invention

[0007] This invention provides a rapid laser-based method for detecting dynamic deflection in small volumes, which solves the problem that existing technologies cannot achieve rapid deflection detection based on small-volume vehicles.

[0008] This invention provides a rapid method for detecting small-volume laser dynamic deflection, comprising:

[0009] The first road surface deformation velocity and velocity noise are obtained at multiple measuring points within a first distance range from the load center using the first velocimeter;

[0010] The second road surface deformation speed and speed noise are obtained by using a second speed measuring instrument at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area.

[0011] For multiple measuring points within the first distance range, calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface at each point.

[0012] The pavement deflection value is inverted based on the differences mentioned above;

[0013] The first speed measuring instrument corresponding to each measuring point within the first distance range and the second speed measuring instrument corresponding to each second distance range are installed on the same rigid crossbeam, which is installed in the measuring vehicle.

[0014] According to the present invention, a rapid laser dynamic deflection detection method for small volume is provided, wherein the first distance range includes at least one of the distribution in front of the vehicle direction and the distribution in the rear of the vehicle direction; and the second distance range is distributed along the front of the vehicle direction.

[0015] According to the present invention, a small-volume laser dynamic deflection rapid detection method is provided, wherein multiple first speed measuring instruments and second speed measuring instruments are installed collinearly and parallel on the rigid crossbeam, and the installation angle of each speed measuring instrument with respect to the perpendicular line to the plane of the road surface in the clockwise direction is -5° to 5°, and the installation angle difference between any two speed measuring instruments is less than 1°.

[0016] According to the present invention, a method for rapid detection of dynamic deflection using small-volume laser technology, while acquiring the first road surface deformation rate and the second road surface deformation rate, also includes: recording the ambient temperature of the road surface to correct the road surface deflection value.

[0017] According to the present invention, a method for rapid detection of dynamic deflection using a small-volume laser is provided, which, while acquiring the first road surface deformation rate and the second road surface deformation rate, also includes: acquiring the vertical vibration acceleration of the bearing axle corresponding to the measuring wheel of the measuring vehicle, and correcting the road surface deflection value based on the vertical vibration acceleration.

[0018] According to the present invention, a rapid laser-based method for detecting dynamic deflection in a small volume includes, while acquiring the first road surface deformation rate and the second road surface deformation rate, acquiring the rotational angular velocity of the rigid beam to compensate for the rotational speed noise of the rigid beam.

[0019] According to the present invention, a rapid detection method for dynamic deflection using small-volume laser technology is provided, which calculates the difference between the deformation rate of the first road surface and the deformation rate of the second road surface using the following formula:

[0020]

[0021] Where n represents the number of the first speed measuring instruments, V rr V represents the second road surface deformation rate within the second distance range. dr V represents the speed measured by the second speed measuring instrument at the reference measuring point within the second distance range. ri V represents the first road surface deformation velocity corresponding to the i-th speed measuring instrument within the first distance range. di k represents the speed measured by the i-th speed measuring instrument within the first distance range. i1 k represents the rotation coefficient corresponding to the i-th speed measuring instrument within the first distance range. i2 G represents the vehicle speed coefficient corresponding to the i-th speed measuring device within the first distance range. x V represents the rotational angular velocity of the rigid beam. h b represents the horizontal speed of the vehicle being measured. i Let represent the constant deviation corresponding to the i-th first speed measuring instrument within the first distance range, where i = 1, 2, ..., n.

[0022] According to the present invention, a rapid method for detecting dynamic deflection using small-volume laser technology is provided, which calculates the road surface deflection value based on the differences mentioned above, using the following formula:

[0023]

[0024] Where w(x) represents the road surface deflection value at any position x along the driving direction from the load center, and parameters A and B are calculated using the following formula:

[0025]

[0026] Where, x r x represents the horizontal distance from the reference measuring point to the center of the load within the second distance range. i This represents the horizontal distance between the i-th first velocimeter and the center of the load within the first distance range.

[0027] According to the present invention, a method for rapid detection of dynamic deflection using small-volume laser is provided, which inverts the road deflection value based on the difference between the two values, including: using parameters A and B to obtain the road deflection value w(x) at any position x along the driving direction from the load center; or, integrating the difference to obtain the relative vertical deformation of the road surface at each measuring point within the first distance range relative to the reference measuring point within the second distance range.

[0028] According to the present invention, a rapid detection method for dynamic deflection using small-volume laser is provided, wherein the difference is integrated according to the following formula to obtain the relative vertical deformation (relative deflection value) of the road surface at each measuring point within the first distance range relative to the reference measuring point within the second distance range.

[0029]

[0030] Where y(x) i ) represents the relative vertical deformation of the road surface of the i-th measuring point within the first distance range relative to the reference measuring point within the second distance range, and dx represents the horizontal distance between two adjacent measuring points.

[0031] The present invention provides a rapid laser-based method for detecting dynamic deflection in small volumes. This method involves acquiring the first road surface deformation velocity at multiple measuring points within a first horizontal distance range from the load center; acquiring the second road surface deformation velocity at a reference measuring point within a second horizontal distance range from the load center, where the maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within a deflection basin region; calculating the difference between each of the first and second road surface deformation velocities; and inverting the road surface deflection value based on each difference. The road surface deformation velocities at the multiple measuring points are measured by multiple velocimeters mounted on the same rigid beam, which is installed in a measuring vehicle. In existing deflection measurement methods based on road deformation rate, the reference speedometer needs to be installed at a horizontal distance of 3.6m from the load center. In addition, to prevent the deflection basins of the front and rear wheels (generated by axle load) from interfering with each other, the wheelbase of the front and rear wheels needs to be greater than 7.2m. This measurement method results in a long measuring vehicle (usually using a tractor + trailer configuration, with a vehicle length typically greater than 13 meters). This measurement method seriously affects the passability of the detection equipment (e.g., height restrictions, traffic restrictions, difficulty in turning, etc.), thus severely limiting the scope of use of the equipment. The small-volume road deflection rapid measurement equipment system provided by this invention does not require the reference measuring point corresponding to the reference speedometer to be outside the deflection basin, i.e., it is within the deflection basin area. During measurement, the speedometer corresponding to the reference measuring point is also within the deflection basin area. The distance between the speedometers corresponding to multiple measuring points is closer, and the structure is more compact. Therefore, a shorter rigid crossbeam can be used, which can greatly reduce the requirement for the wheelbase of the front and rear wheels of the vehicle. A smaller measuring vehicle (e.g., a small or medium-sized vehicle) can be selected, thereby realizing rapid deflection detection for a small-volume vehicle. The testing equipment corresponding to this testing method has good traffic capacity, which can significantly reduce the cost of equipment use. It has a wide range of applications, low empty travel rate during actual testing, and relatively small deformation of the shorter crossbeam during operation, which can improve the reliability of the test results. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a flowchart illustrating the rapid detection method for small-volume laser dynamic bending provided by the present invention.

[0034] Figure 2 This is an installation structure diagram of the first velocimeter, the second velocimeter, and the rigid crossbeam in the small-volume laser dynamic deflection rapid detection method provided by the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of the small-volume laser dynamic bending rapid detection device provided by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] The small-volume laser dynamic bending rapid detection method of the present invention, such as... Figure 1 As shown, it includes:

[0039] Step S110: Use a first velocimeter to acquire the first road surface deformation velocity and velocity noise at multiple measuring points within a first distance range from the load center. Specifically, such as... Figure 2 As shown, the first velocimeter can be a Doppler laser velocimeter. Multiple first velocimeters 3 are mounted on the same rigid beam 1 to measure multiple measuring points (such as...). Figure 2 In the middle, points D1 to D2 m Used to obtain the speed of downward deformation of the road surface, and points P1 to P2. n The first road surface deformation speed and speed noise are used to obtain the road surface rebound speed. The rigid beam 1 is installed in the measuring vehicle. When the measuring vehicle passes through the road surface deflection basin, multiple first road surface deformation speeds are measured by multiple first speed measuring instruments. The first road surface deformation speed is the vertical deformation speed of the road surface under driving conditions.

[0040] Step S120: Use a second velocimeter to acquire the second road surface deformation velocity and velocity noise at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area. That is, the first distance range is the distance range close to the load center, and the second distance range is the distance range far from the load center. Figure 2 As shown, the second speed measuring instrument 2 is installed on the rigid crossbeam 1, and measures the reference measuring point ( Figure 1The second road surface deformation velocity and velocity noise at the midpoint R). Velocity noise includes noise generated by beam vibration, beam rotation, and horizontal beam movement. The reference measuring point, which is horizontally far from the load center, may be located within or outside the deflection basin due to the road structure. In this embodiment, the reference measuring point is located within the deflection basin area, and the corresponding speedometer is also located within the deflection basin area during measurement. The distance between the speedometers corresponding to multiple measuring points is relatively short, resulting in a more compact structure and allowing for the use of a smaller measuring vehicle.

[0041] Step S130: For multiple measuring points within the first distance range, calculate the difference between the deformation velocity of the first road surface and the deformation velocity of the second road surface at each point. That is, subtract the deformation velocity of the first road surface from the deformation velocity of the second road surface to obtain multiple difference values.

[0042] Step S140: Invert the pavement deflection value based on the differences mentioned above.

[0043] Each first speed measuring instrument 3 corresponding to each measuring point within the first distance range and the second speed measuring instrument 2 corresponding to each second distance range are installed on the same rigid crossbeam 1. The rigid crossbeam 1 is installed in the measuring vehicle. The first distance range includes at least one of distribution in front of the vehicle direction and distribution in the rear of the vehicle direction. The second distance range is distributed along the front of the vehicle direction.

[0044] In this embodiment of the rapid laser dynamic deflection detection method for small volume, the first speed measuring instruments 3 corresponding to each measuring point within a first distance range and the second speed measuring instruments 2 corresponding to each measuring point within a second distance range are mounted on the same rigid beam 1. The rigid beam 1 is installed in the measuring vehicle. Since the reference measuring point is located within the deflection basin area, the speed measuring instrument corresponding to the reference measuring point is also located within the deflection basin area during measurement. The distance between the speed measuring instruments corresponding to multiple measuring points is relatively close, resulting in a more compact structure. This allows the use of a shorter rigid beam and a smaller measuring vehicle (e.g., a small or medium-sized truck), thereby achieving rapid deflection detection for a small-volume vehicle. The detection equipment corresponding to this method has good traffic capacity, which can significantly reduce the cost of equipment use. It has a wide range of applications, a low empty-running rate during actual detection, and the relatively small deformation of the shorter beam during operation can improve the reliability of the detection results.

[0045] In this embodiment, the first distance range is 0–1800 mm, that is, the range from the radius of the load center is 0–1800 mm, and the second distance range is 2000 mm–2800 mm, that is, the range from the radius of the load center is 2000 mm–2800 mm. Multiple measuring points, approximately 2–15 in number, are located horizontally close to the load center, and these measuring points are distributed radially along the deflection basin at intervals of 100 mm, 200 mm, 300 mm, or 600 mm within the first distance range.

[0046] In some embodiments, multiple first speed measuring instruments 3 and second speed measuring instruments 2 are installed collinearly and parallel to each other on the rigid crossbeam 1, that is, the center of each speed measuring instrument is on the same straight line parallel to the rigid crossbeam 1, and the axes of each speed measuring instrument are parallel to each other. The installation angle α between each speed measuring instrument and the perpendicular line to the plane of the road surface in a clockwise direction is -5° to 5°, and the difference in installation angle between any two speed measuring instruments is less than 1°, so as to avoid measurement errors caused by different installation angles.

[0047] In some embodiments, while acquiring the road deformation rate at multiple measuring points within a first distance range from the horizontal distance of the load center, the method further includes: recording the ambient temperature of the road surface to correct the road deflection value. Specifically, as shown in the figure... Figure 2 As shown, a temperature sensor 4 is used to acquire the road surface ambient temperature. The temperature sensor 4 is mounted on the rigid crossbeam 1 and is used to measure the road surface temperature simultaneously with the acquisition of the first and second road surface deformation rates. After the road surface deflection value is subsequently calculated, it is corrected using a correction coefficient corresponding to the road surface temperature, thus making the final road surface deflection value more accurate. Different road surface temperatures correspond to different correction coefficients, which can be obtained using currently available methods for temperature-based correction of road surface deflection values. Since the road surface deformation rate varies with temperature, correcting the road surface deflection value using ambient temperature makes the final detected deflection value more accurate.

[0048] In some embodiments, while acquiring the road deformation velocity at multiple measuring points within a first distance range from the load center, the method further includes: acquiring the vertical vibration acceleration of the bearing axle corresponding to the measuring wheel of the measuring vehicle, and correcting the road deflection value based on the vertical vibration acceleration. Specifically, the load correction coefficient kl is acquired by using an accelerometer installed on the bearing axle corresponding to the measuring wheel.

[0049]

[0050] Where a MC represents the vertical vibration acceleration of the corresponding bearing shaft when the current measuring vehicle is located at the measuring position M (marking the position of the measuring vehicle during the measurement process), and C represents the average vertical vibration acceleration of the corresponding bearing shaft within a preset time range at the adjacent measuring position M.

[0051] The original pavement deflection value is corrected using the measured load correction factor kl, as follows:

[0052] w′(x)=kl*w(x) (2)

[0053] Where w(x) is the original road deflection value, w′(x) is the road deflection value after load correction, w(x) can be calculated according to the following formula (4), where x is the measuring point position at any mileage detection position M, with M as the load center, and a distance x from the load center along the driving direction.

[0054] In this embodiment, the road surface deflection value is corrected by vertical vibration acceleration, making the final detected deflection value more accurate.

[0055] In some embodiments, while acquiring the road surface deformation velocity at multiple measuring points within a first distance range from the load center, the method further includes: acquiring the rotational angular velocity G of the rigid beam 1. z This is to compensate for the rotational speed noise of the rigid beam. Specifically, such as... Figure 2 As shown, a rotational speed sensor 5 (e.g., a gyroscope) is installed on the rigid beam 1 to obtain the rotational angular velocity G of the rigid beam. x Based on rotational angular velocity G x The rotational speed noise of the rigid beam 1 can be compensated using the following formula. By compensating for the rotational speed noise of the rigid beam 1, the final road deflection value is more accurate.

[0056] In some embodiments, the difference between the deformation rate of the first road surface and the deformation rate of the second road surface is calculated using the following formula:

[0057]

[0058] Where n represents the number of the first speed measuring instruments, V rr V represents the second road surface deformation rate within the second distance range. dr V represents the speed measured by the second speed measuring instrument at the reference measuring point within the second distance range. ri V represents the first road surface deformation velocity corresponding to the i-th speed measuring instrument within the first distance range. di k represents the speed measured by the i-th speed measuring instrument within the first distance range. i1k represents the rotation coefficient corresponding to the i-th speed measuring instrument within the first distance range. i2 G represents the vehicle speed coefficient corresponding to the i-th speed measuring device within the first distance range. x V represents the rotational angular velocity (velocity noise) of the rigid beam. h This indicates the horizontal movement speed of the vehicle being measured (the speed noise generated by the horizontal movement of the crossbeam), b i Let V represent the constant deviation corresponding to the i-th speed measuring instrument within the first distance range, where i = 1, 2, ..., n. Wherein, the road surface deformation velocity (V) is... rr and V ri ) only the speedometer measures the speed (the above V) dr and V di The deformation rate of the road surface is a very small component in the load. The closer the measuring point is to the load center, the greater the road surface deformation rate. The road surface deformation rate at the reference measuring point is smaller.

[0059] In the above formula (3), V h It can be calculated based on the real-time positioning system information of the vehicle platform (e.g., GNSS, encoder, etc.) or obtained through a specific speed sensor. The parameter k in formula (3) i1 k i2 and b i This can be obtained through calibration. The calibration method can be static or dynamic. For example, in dynamic calibration, a relatively stiff airport runway can be selected for dynamic calibration. In this case, the road surface deformation rate at all measuring points can be assumed to be 0. Combined with multivariate statistical analysis, the aforementioned parameter k can then be obtained. i1 k i2 and b i .

[0060] In some embodiments, the pavement deflection value is inverted based on each of the aforementioned differences and calculated using the following formula:

[0061]

[0062] Where w(x) represents the road surface deflection value at any position x along the driving direction from the load center, and parameters A and B are calculated using the following formula:

[0063]

[0064] Where, x r x represents the horizontal distance from the reference measuring point to the center of the load within the second distance range. i This represents the horizontal distance between the i-th velocimeter and the center of the load within the first distance range. Parameters A and B can be estimated using the least squares method according to the above formula (5).

[0065] Specifically, the calculation module is used to obtain the road deflection value w(x) at any position x along the driving direction from the load center based on parameters A and B; or, the calculation module is used to integrate the difference according to the following formula, that is, to integrate the difference calculated by formula (3) to obtain the relative vertical deformation of the road surface (relative deflection value) of each measuring point in the first distance range relative to the reference measuring point in the second distance range, wherein the road deflection value is the deformation caused by the applied load, and the relative deflection value is usually less than the road deflection value.

[0066]

[0067] Where y(x) i ) represents the relative vertical deformation of the road surface of the i-th measuring point within the first distance range relative to the reference measuring point within the second distance range, and dx represents the horizontal distance between two adjacent measuring points.

[0068] The small-volume laser dynamic deflection rapid detection device provided by the present invention is described below. The small-volume laser dynamic deflection rapid detection device described below can be referred to in correspondence with the small-volume laser dynamic deflection rapid detection method described above.

[0069] The small-volume laser dynamic bending rapid detection device provided by this invention, such as... Figure 3 As shown, it includes:

[0070] The first deformation speed acquisition module 310 is used to acquire the first road surface deformation speed and speed noise at multiple measuring points within a first distance range from the horizontal distance of the load center using a first speed measuring instrument.

[0071] The second deformation speed acquisition module 320 is used to acquire the second road surface deformation speed and speed noise of a reference measuring point at a horizontal distance of a second distance from the load center within a second distance range using a second speed measuring instrument. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area.

[0072] The speed difference calculation module 330 is used to calculate the difference between the first road surface deformation speed and the second road surface deformation speed at multiple measuring points within a first distance range.

[0073] The deflection value inversion module 340 is used to invert the pavement deflection value based on the differences mentioned above.

[0074] The first speed measuring instrument corresponding to each measuring point within the first distance range and the second speed measuring instrument corresponding to each second distance range are installed on the same rigid crossbeam, which is installed in the measuring vehicle.

[0075] The small-volume laser dynamic deflection rapid detection device of the present invention mounts the first speed measuring instruments corresponding to each measuring point within a first distance range and the second speed measuring instruments corresponding to each measuring point within a second distance range on the same rigid crossbeam. The rigid crossbeam is installed in the measuring vehicle, which can use a shorter rigid crossbeam and a smaller measuring vehicle (e.g., a medium-sized truck). The detection equipment corresponding to this detection method has good traffic capacity, which can significantly reduce the cost of equipment use, has a wide range of application scenarios, and has a low empty driving rate during actual detection. In addition, the deformation of the shorter crossbeam itself during operation is relatively small, which can improve the reliability of the detection results.

[0076] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a rapid detection method for small-volume laser dynamic deflection, which includes:

[0077] The first road surface deformation velocity and velocity noise are obtained by using the first velocimeter at multiple measuring points within a first distance range from the horizontal distance of the load center.

[0078] The second road surface deformation velocity and velocity noise are obtained by using a second velocimeter at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area.

[0079] For multiple measuring points within the first distance range, calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface at each point.

[0080] The pavement deflection value is inverted based on the differences mentioned above.

[0081] The first speed measuring instrument corresponding to each measuring point within the first distance range and the second speed measuring instrument corresponding to each second distance range are installed on the same rigid crossbeam, which is installed in the measuring vehicle.

[0082] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0083] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is able to execute the small-volume laser dynamic deflection rapid detection method provided by the above methods, the method comprising:

[0084] The first road surface deformation velocity and velocity noise are obtained by using the first velocimeter at multiple measuring points within a first distance range from the horizontal distance of the load center.

[0085] The second road surface deformation velocity and velocity noise are obtained by using a second velocimeter at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area.

[0086] For multiple measuring points within the first distance range, calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface at each point.

[0087] The pavement deflection value is inverted based on the differences mentioned above.

[0088] The first speed measuring instrument corresponding to each measuring point within the first distance range and the second speed measuring instrument corresponding to each second distance range are installed on the same rigid crossbeam, which is installed in the measuring vehicle.

[0089] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the small-volume laser dynamic deflection rapid detection method provided by the methods described above, the method comprising:

[0090] The first road surface deformation velocity and velocity noise are obtained by using the first velocimeter at multiple measuring points within a first distance range from the horizontal distance of the load center.

[0091] The second road surface deformation velocity and velocity noise are obtained by using a second velocimeter at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area.

[0092] For multiple measuring points within the first distance range, calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface at each point.

[0093] The pavement deflection value is inverted based on the differences mentioned above.

[0094] The first speed measuring instrument corresponding to each measuring point within the first distance range and the second speed measuring instrument corresponding to each second distance range are installed on the same rigid crossbeam, which is installed in the measuring vehicle.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0096] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid laser-based detection method for dynamic bending in small volumes, characterized in that, include: The first road surface deformation velocity and velocity noise are obtained at multiple measuring points within a first distance range from the load center using the first velocimeter; The second road surface deformation speed and speed noise are obtained by using a second speed measuring instrument at a reference measuring point within a second distance range from the load center. The maximum value of the first distance range is less than the minimum value of the second distance range, and the reference measuring point is located within the deflection basin area. For multiple measuring points within the first distance range, calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface at each point. The pavement deflection value is inverted based on the differences mentioned above; Among them, each of the first speed measuring instruments corresponding to each measuring point within the first distance range and the second speed measuring instruments corresponding to the second distance range are installed on the same rigid crossbeam, and the rigid crossbeam is installed in the measuring vehicle. In addition to obtaining the first road surface deformation rate and the second road surface deformation rate, the method also includes obtaining the rotational angular velocity of the rigid beam to compensate for the rotational speed noise of the rigid beam.

2. The method for rapid detection of small-volume laser dynamic deflection according to claim 1, wherein the first distance range includes at least one of distribution in front of the vehicle direction and distribution in the rear of the vehicle direction; and the second distance range is distributed along the front of the vehicle direction.

3. The method for rapid detection of small-volume laser dynamic bending according to claim 1, characterized in that, Multiple first and second speed measuring instruments are installed collinearly and parallel on the rigid crossbeam. The installation angle of each speed measuring instrument with respect to the perpendicular line to the plane of the road surface in a clockwise direction is -5° to 5°, and the difference in installation angle between any two speed measuring instruments is less than 1°.

4. The method for rapid detection of small-volume laser dynamic bending according to claim 1, characterized in that, In addition to acquiring the first road surface deformation rate and the second road surface deformation rate, the method also includes: recording the ambient temperature of the road surface to correct the road surface deflection value.

5. The method for rapid detection of small-volume laser dynamic bending according to claim 1, characterized in that, While acquiring the first road surface deformation rate and the second road surface deformation rate, the method also includes: acquiring the vertical vibration acceleration of the bearing axle corresponding to the measuring wheel of the measuring vehicle, and correcting the road surface deflection value based on the vertical vibration acceleration.

6. The method for rapid detection of small-volume laser dynamic bending according to claim 1, characterized in that, Calculate the difference between the deformation rate of the first road surface and the deformation rate of the second road surface using the following formula: ； in, n This indicates the number of the first speed measuring instruments. This indicates the second road surface deformation rate within the second distance range. This indicates the speed measured by the second speed measuring instrument at the reference measuring point within the second distance range. Indicates the first distance range. i The first road surface deformation velocity corresponding to the first speed measuring instrument. Indicates the first distance range. i The speed measured by the first speed measuring instrument Indicates the first distance range. i The rotation coefficient corresponding to the first speed measuring instrument Indicates the first distance range. i The vehicle speed coefficient corresponding to the first speed measuring instrument. This represents the rotational angular velocity of the rigid beam. This indicates the horizontal speed of the vehicle being measured. Indicates the first distance range. i The constant deviation corresponding to the first speed measuring instrument i = 1,2,…, n .

7. The method for rapid detection of small-volume laser dynamic bending according to claim 6, characterized in that, Based on the inversion of the aforementioned differences, the pavement deflection value is calculated using the following formula: ； in, Let x represent the road surface deflection value at any position x along the direction of travel from the load center. Parameters A and B are calculated using the following formula: ； in, This indicates the horizontal distance from the reference measuring point to the center of the load within the second distance range. Indicates the first distance range. i The horizontal distance between the first velocimeter and the center of the load.

8. The method for rapid detection of small-volume laser dynamic bending according to claim 7, characterized in that, Based on the aforementioned differences, the pavement deflection value is inverted, including: using parameters A and B to obtain the pavement deflection value at any position along the driving direction from the load center. pavement deflection value Alternatively, the difference can be integrated to obtain the relative vertical deformation of the road surface at each measuring point within the first distance range relative to the reference measuring point within the second distance range.

9. The method for rapid detection of small-volume laser dynamic bending according to claim 8, characterized in that, Integrate the difference using the following formula to obtain the relative vertical deformation of the road surface at each measuring point within the first distance range relative to the reference measuring point within the second distance range: ； in, Within the first distance range, the first i The relative vertical deformation of the road surface at each measuring point within the second distance range relative to the reference measuring point. This represents the horizontal distance between two adjacent measuring points.

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