Dynamic calibration system and method for vehicle-mounted pavement flatness measuring equipment

Abstract

The invention discloses a dynamic calibration system and method for vehicle-mounted pavement flatness measuring equipment, and belongs to the technical field of dynamic calibration of measuring equipment, and the system comprises a vibration test platform which is used for enabling the vehicle-mounted pavement flatness measuring equipment to perform alternating linear motion; the disc is positioned in the measurement range of the vehicle-mounted pavement flatness measurement equipment; the rotating device is used for driving the disc to rotate; the control assembly is connected with the vibration test platform and the rotation device; the disc comprises a first surface and a second surface, wherein the first surface and the second surface form a step height difference. According to the dynamic calibration system and method for the vehicle-mounted road surface flatness measuring equipment, the actual working state of the vehicle-mounted road surface flatness measuring equipment is simulated, and the metering characteristic and reliability of the measuring equipment are comprehensively verified.

Description

Technical Field

[0001] The invention belongs to the technical field of dynamic calibration of measuring equipment, and in particular relates to a dynamic calibration system and method for vehicle-mounted road surface smoothness measuring equipment. Background Art

[0002] Parameters such as pavement flatness, structural depth, rutting depth, crack length and area are currently used at home and abroad to evaluate the relevant characteristics of highway bridges. They are closely related to the service status of highway bridges and are important parameters for evaluating driving safety and construction quality and making maintenance decisions. However, there are still the following problems in the measurement and evaluation of the above parameters in the industry: 1. In the highway bridge industry, there are still few standard sites (or standard samples) for value transfer; 2. In the field of highway bridges, standard instruments and testing standards for value transfer have not yet been fully established; 3. There is still a lack of systematic technical solutions and a complete measurement system for the value traceability of the main indicators of highways and bridges. Taking pavement flatness as an example, there are many devices for testing pavement flatness, and the number of users of testing equipment is also huge. A metrological calibration specification for vehicle-mounted laser flatness meters has been formulated, but there are still certain difficulties in equipment inspection and traceability, and there is controversy over measurement accuracy.

[0003] Road surface roughness testing is generally carried out in the form of vehicle or aircraft, which can meet the requirements of large range, large scale and high speed, which poses a challenge to the measurement of highway testing equipment. Since there are currently few standard sites that can be used for the measurement of road surface roughness testing equipment, the accurate measurement of road surface roughness measurement sensors has become the focus of researchers and engineers in the industry.

[0004] The current technical specifications all require static calibration of some sensors in the measuring equipment in the laboratory, such as calibrating the laser rangefinder and acceleration sensor in the vehicle-mounted road surface roughness measuring equipment. This method has the following problems: 1. The metrological characteristics of the sensor itself cannot fully reflect the overall performance of the measuring equipment, and there is an intermediate link between the metrological characteristics of the sensor and the index value finally output by the measuring equipment; 2. The actual working environment of the measuring equipment is carried out in a dynamic state, and its stability and reliability under normal working conditions cannot be reflected by calibrating the static characteristics of the sensor alone; 3. There are also problems such as low test efficiency and high metrological cost when calibrating the sensors separately. Therefore, it is necessary to develop a new dynamic calibration system and method for vehicle-mounted road surface roughness measuring equipment to solve the existing problems. Summary of the invention

[0005] The object of the present invention is to provide a dynamic calibration device and method for a vehicle-mounted road surface roughness measuring device, so as to solve the problem that the calibration accuracy of the vehicle-mounted road surface roughness measuring device is not high.

[0006] To achieve the above object, the present invention provides the following technical solution: a dynamic calibration system for a vehicle-mounted road surface roughness measuring device, comprising:

[0007] A vibration test platform for making vehicle-mounted road surface roughness measuring equipment undergo alternating linear motion;

[0008] A disc located within the measuring range of the vehicle-mounted road surface roughness measuring device;

[0009] A rotary device for driving the disc to rotate;

[0010] and a control assembly connected to the vibration test platform and the rotary device;

[0011] Wherein, the disk includes: a first surface and a second surface forming a step height difference with the first surface.

[0012] Preferably, the step height difference is 3 mm. The value is set according to the actual undulation of the normal road surface, and the value can be changed by processing discs with different height differences.

[0013] Preferably, the angle between the slope formed by the first surface and the second surface and the vertical axis is 45°. The angle of 45° is to ensure a smooth transition when the step height changes, so that the waveform generated during measurement has a smooth transition without sudden changes;

[0014] Preferably, the rotating device comprises:

[0015] A base, a rotating spindle assembled in the base for connecting the disc, a synchronous pulley connected to the rotating spindle, a servo motor connected to the synchronous pulley, an industrial computer controlling the servo motor through a servo motor driver, a data acquisition card connected to the industrial computer, an encoder for acquiring an angular displacement pulse signal of the rotating spindle and sending it to the data acquisition card, and a control panel connected to the industrial computer.

[0016] Preferably, the synchronous pulley includes: a first synchronous pulley assembled on the output shaft of the servo motor, and a second synchronous pulley connected to the first synchronous pulley via a synchronous belt with a toothed structure, the second synchronous pulley is sleeved on the rotating main shaft, the rotating main shaft is a stepped structure, and its upper part is respectively sleeved with a cover tube connected to the base and a sleeve connected to a supporting plate, the supporting plate is fixed inside the base, an encoder is provided on the end of the rotating main shaft extending out of the supporting plate, and the end of the rotating main shaft extending out of the base is fixed with a disc by a screw connection and positioned using a locating pin; the control panel controls the servo motor driver through an industrial computer to achieve stepless speed regulation of the servo motor.

[0017] Preferably, the servo motor is fixed to the supporting plate and is on the same side as the encoder, and the output shaft of the servo motor passes through the supporting plate and is assembled with the first synchronous pulley, and the distance between the first synchronous pulley and the second synchronous pulley is half of the radius of the first synchronous pulley.

[0018] Preferably, a protective cover is arranged on the periphery of the disc, and the protective cover is provided with a test port for testing a vehicle-mounted road surface smoothness measuring device.

[0019] The present invention further provides a dynamic calibration method for a vehicle-mounted road surface smoothness measuring device, which is characterized by comprising:

[0020] Adjust the vertical height of the vehicle-mounted road surface roughness measuring device so that its laser distance sensor is within the normal measurement range, and adjust the angle of the laser distance sensor in the vehicle-mounted road surface roughness measuring device so that its laser irradiates the surface of the disc vertically;

[0021] Calculate the simulated vehicle speed. Assume that the rotational spindle speed is n (r / min), and the distance between the laser point and the axis of the rotational spindle (420) is r (mm). Then the linear speed of the point is

[0022] Set different frequencies to apply sinusoidal signal excitation to the vibration test platform;

[0023] After the rotary device and the vibration test platform reach a stable operating state, the vehicle-mounted road surface roughness measurement equipment starts to collect elevation data at a set sampling interval. When the simulated driving distance reaches the set value, the test is stopped and the elevation data is recorded.

[0024] The measuring point on the first surface of the disk step is called the high point, and the measuring point on the second surface is called the low point. The average elevation of all high points and low points is calculated and recorded as h G and h D , then h=h G -h D ;

[0025] Under dynamic calibration conditions, the elevation measurement indication error of the vehicle-mounted road roughness measuring equipment is expressed as Δh=h-h0.

[0026] Preferably, the frequencies are set to 2 Hz, 5 Hz, 10 Hz, 20 Hz, 40 Hz, 80 Hz, and 100 Hz, respectively.

[0027] Preferably, the rotation speed n is set to 417 r / min, and the distance r between the laser point and the axis of the rotating spindle is set to 159 mm; based on the rotation speed and distance r, the actual linear speed can be calculated, that is, the driving speed of the vehicle is simulated.

[0028] The technical effects and advantages of the present invention are as follows: the dynamic calibration system and method for vehicle-mounted road surface roughness measuring equipment can comprehensively verify the metrological characteristics and reliability of such measuring equipment by simulating the actual working state of the vehicle-mounted road surface roughness measuring equipment; it can "concentrate" large-scale and large-scale highway measurements into a conventional-scale calibration system, and the calibration site can be changed from an outdoor standard road surface to a standard laboratory environment; it can solve the value traceability problem of the road surface roughness measuring sensor, and it has high stability and repeatability, and plays an important guiding role in the measurement accuracy verification of outdoor road surface measuring instruments or equipment, and can be used to verify the measurement accuracy of outdoor road surface measuring instruments or equipment through high-precision rotary devices and height difference standards. The disc is used to simulate the "undulations" of the road surface. The vehicle-mounted road surface flatness measuring equipment is reliably installed and fixed on the vibration test platform. The measuring equipment vibrates back and forth at a certain frequency and collects elevation data of the high-speed rotating standard disc at the same time. It simulates the driving of the vehicle and the vibration of the vehicle during driving, provides a dynamic calibration environment, and builds a high-precision dynamic measurement system. It simulates the actual working state of the object being measured under laboratory conditions, effectively improves the measurement accuracy, is more scientific and reasonable, and is a beneficial supplement to the current relevant measurement and calibration specifications. It can provide effective technical support for product development and quality control of related companies in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the system of the present invention;

[0030] Figure 2 This is a working principle diagram of the rotary device of the present invention;

[0031] Figure 3 is a cross-sectional schematic diagram of the disc of the present invention;

[0032] Figure 4 is a bottom view of the disc of the present invention;

[0033] Figure 5 This is a working principle diagram of the vibration test platform of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the rotary device of the present invention;

[0035] Figure 7 Schematic diagram of the Quarter Car model in the method of the present invention.

[0036] In the figure: 100, vehicle-mounted road surface roughness measuring equipment; 200, vibration test platform; 300, disc; 400, rotating device; 301, screw; 310, first surface; 320, second surface; 410, base; 420, rotating spindle; 430, synchronous pulley; 440, servo motor; 450, servo motor driver; 460, industrial computer; 470, data acquisition card; 480, encoder; 490, control panel; 430a, first synchronous pulley; 430b, second synchronous pulley; 430c, synchronous belt; 420a, cover tube; 420b, sleeve; 420c, positioning pin; 411, protective cover; 411a, test port. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1

[0039] The present invention provides Figure 1 A dynamic calibration system for a vehicle-mounted road surface roughness measuring device shown in the figure mainly comprises a rotating device 400, a vibration test platform 200, a disc 300 and a control component; the disc 300 is a standard disc, the vehicle-mounted road surface roughness measuring device 100 is reliably fixed on the vibration test platform 200 and adjusted to a suitable height position and radial position, the standard disc is installed on the rotating spindle 420 of the rotating device 400 and rotates at a speed n, at the same time, the vibration test platform 200 generates a fixed frequency vibration to drive the vehicle-mounted road surface roughness measuring device 100 to vibrate back and forth at a certain frequency f, at the same time, the control software of the vehicle-mounted road surface roughness measuring device 100 is turned on, and the elevation data of the standard disc is automatically collected, and the dynamic calibration process begins.

[0040] like Figure 2The working principle diagram of the rotary device 400 is shown as follows; through the control panel 490, the industrial computer 460 controls the servo motor driver 450, which in turn drives the servo motor 440, and drives the shaft to rotate through the toothed synchronous pulley 430. Due to the action of the synchronous belt 430c, the shaft and the servo motor 440 rotate in complete synchronization, and then the disc 300 is fixed to the rotating spindle 420 by fastening nails, so as to achieve precise control of the rotation speed of the disc 300. The encoder 480 transmits the pulse signal to the data acquisition card 470 by measuring the angular displacement of the shaft. The data acquisition card 470 counts, and then the industrial computer 460 displays the counted data through the control panel 490. Through the industrial computer 460, the servo motor driver 450, the servo motor 440, and the synchronous pulley 430, stepless speed regulation is achieved, and the control panel 490 accurately controls the rotation speed of the disc 300. Control; the number of revolutions of the disc 300 can be recorded by an encoder 480, a data acquisition card 470, an industrial computer 460, etc., and can be directly read through a control panel 490; the disc 300 is connected by fastening screws and positioned by a positioning pin 420c, so the disc 300 can be replaced, and the disc 300 is additionally provided with a protective cover 411 to ensure the safety of the operator, and a hole is opened above the protective cover 411, through which the detector can be tested; the use of a toothed synchronous belt 430c for transmission can reduce vibration and achieve a precise transmission ratio; the vibration of the equipment and the jumping of the disc 300 can be controlled within a very small range.

[0041] like Figure 6 As shown, the rotating device 400 includes:

[0042] Base body 410: Made of stainless steel, it is corrosion-resistant and high-temperature-resistant, has high rigidity, is not easily deformed, and reduces vibration during operation of the equipment and vibration of the disc 300;

[0043] The rotary main shaft 420 adopts a stepped shaft design method, which can facilitate the assembly, disassembly and fixation of parts. The bottom and top ends of the shaft are fixed in axial position through the base 410 by the stepped part of the shaft and the fastening nut respectively;

[0044] Bearing: The bearing uses a thrust bearing, which can withstand a large axial force and further reduce the axial runout of the shaft.

[0045] The servo motor 440 is driven by the industrial computer 460 through the control panel 490 to control the servo motor driver 450, which can achieve stepless speed regulation. The servo system has a resonance suppression function, so the servo motor 440 runs very smoothly without vibration. The control accuracy of the servo motor 440 is guaranteed by the rotary encoder 480 at the rear end of the motor shaft, which can ensure extremely high rotation accuracy.

[0046] Control module: The control module is composed of a control panel 490, an industrial computer 460, a data acquisition card 470, an encoder 480, etc. The control panel 490 can be used to precisely control the rotation speed of the servo motor 440, so that the disc 300 reaches a preset rotation speed. The encoder 480 can be used to convert the angular displacement of the disc 300 into a pulse signal, and the data acquisition card 470 can be used to realize the counting function. The industrial computer 460 can display the number of revolutions of the disc 300 through the control panel 490;

[0047] Synchronous pulley 430: A toothed belt transmission is used between the servo motor 440 and the rotating main shaft 420, which can reduce impact and make the transmission more stable. The synchronous belt 430c has a toothed structure to ensure transmission accuracy. The servo motor 440 and the rotating main shaft 420 use a synchronous pulley 430, which is connected by a key connection, so that the speed of the rotating disc 300 can be accurately controlled by controlling the speed of the servo motor 440.

[0048] Installation of disc 300: disc 300 is connected to rotating spindle 420 by fastening screws, so disc 300 can be replaced. Its positioning accuracy is guaranteed by positioning pin 420c. Positioning hole is processed by wire-cutting processing technology, so it can achieve quite high positioning accuracy and make its axial runout small. Disc 300 is equipped with protective cover 411 to ensure the safety of operators. A circular hole is opened on the upper end of protective cover 411, and the detector can test the rotating disc 300 through this hole.

[0049] The structure of the disc 300 is as follows Figure 3 , Figure 4 As shown, a certain step height difference h0 is formed on the upper surface, and the dimensional processing accuracy is controlled within 0.01mm;

[0050] The vibration test platform 200 can generate alternating linear motion through the control of the vibration controller. The system workflow is as follows: Figure 5 The main technical parameters are shown below.

[0051] Table 1 Technical parameters of vibration test platform

[0052]

[0053] Embodiment 2

[0054] The present invention further provides a dynamic calibration method for a vehicle-mounted road surface smoothness measuring device, comprising the following steps:

[0055] Step 1, installation of the vehicle-mounted road surface roughness measuring device 100: the vehicle-mounted road surface roughness measuring device 100 is reliably installed and fixed on the vibration test platform 200, and the acceleration sensor of the vibration test platform 200 is installed and fixed together with the vehicle-mounted road surface roughness measuring device 100 to be measured;

[0056] Step 2, position adjustment of the vehicle-mounted road surface roughness measuring device 100: adjust the vertical height of the vehicle-mounted road surface roughness measuring device 100 so that its laser ranging sensor is within the normal measurement range, adjust the angle of the laser ranging sensor in the vehicle-mounted road surface roughness measuring device 100 so that its laser hits the surface of the disc 300 vertically, and adjust the lateral position of the vehicle-mounted road surface roughness measuring device 100;

[0057] Step 3, measurement parameter setting of the rotating device 400: Assume that the rotation speed of the rotating spindle 420 is n (r / min), and the distance between the laser point and the axis of the rotating spindle 420 is r (mm), then the linear speed of the point is This speed is the simulated vehicle driving speed, and the parameter settings of the rotary device 400 are shown in the following table.

[0058]

[0059] The parameter settings in the table above simulate the vehicle's driving speed of 25km / h, and the disk rotates 300 times to simulate a driving distance of 1m, and so on in a cyclical motion;

[0060] Step 4, parameter setting of the vibration test bench 200: by setting different frequencies, a sinusoidal signal excitation is applied to the vibration bench, thereby forming a simulated vibration test environment, and the vibration frequencies are set to 2Hz, 5Hz, 10Hz, 20Hz, 40Hz, 80Hz, and 100Hz in sequence; by setting different frequencies in sequence, the vibration conditions of an actual vehicle driving on the road are simulated, and parameter settings of different frequencies are selected to cover and fit the actual vibration conditions.

[0061] Step 5: After the rotary device 400 and the vibration test platform 200 reach a stable operating state according to the pre-set settings, the vehicle-mounted road surface roughness measurement device 100 starts to collect elevation data at a certain sampling interval. When the simulated driving distance reaches 50m, the test can be stopped and the elevation data can be recorded;

[0062] Step 6: The measuring point on the upper surface of the step of the disk 300, i.e., the first surface 310, is called a high point, and the measuring point on the lower surface of the step, i.e., the second surface 320, is called a low point. The average elevations of all the high points and low points are calculated and recorded as h G and h D , then h=h G -h D ;

[0063] Under dynamic calibration conditions, the elevation measurement indication error of the vehicle-mounted road surface roughness measuring device 100 can be expressed as:

[0064] Δh=h-h0; calibration is completed when the indication error is obtained.

[0065] The International Roughness Index (IRI) (referred to as road roughness in this application) is the ratio of the total displacement of the vehicle body suspension system to the driving distance within a certain driving distance (in m / km) when simulating a Quarter Car model at a driving speed of 80 km / h. Figure 7 As shown;

[0066] The Quarter Car model is solved using the dynamic method, and the resulting dynamic balance differential equation is shown in Formula (2-8).

[0067]

[0068] The international flatness index is defined as the Z s With Z u The accumulation of the difference is shown in formula (2-9).

[0069]

[0070] The discrete formula is shown in formula (2-10).

[0071]

[0072] In order to ensure the consistency and standardization of the evaluation index IRI, a fixed parameter method is usually used to unify the evaluation index, that is, the standardized 1 / 4 car model, and the parameters are shown in formula (2-11).

[0073]

[0074] There are many methods to solve the international roughness index. The most commonly used methods are the transfer matrix method and the numerical solution based on computer language. The World Bank also provides a calculation method for the transfer matrix method. By calculating the four state quantities Z at the four cross-section sampling points s ', Z s ' s , Z' u , Z' uu The solution is shown in formula (2-12).

[0075]

[0076] The average slope at 0 or 11m after the start of the test section can be used as the initial value of the four state variables at the first sampling point of the section. The four state variables from the second sampling point to the nth sampling point of the section can be obtained by the recursive equation.

[0077] The final IRI value is calculated according to formula (2-8).

[0078]

[0079] By deriving the formula of IRI using the transfer matrix method, the coefficient matrices are:

[0080]

[0081] Where v is the vehicle speed;

[0082] I——Unit matrix of the same order as A;

[0083] t——time;

[0084] A, B——parameter matrix,

[0085] For the above mathematical model, the World Bank's Document No. 46 has given a standard calculation procedure. The input of the calculation procedure is n elevation data. By setting the sampling interval, driving speed, and vehicle-related parameters, the IRI value can be directly calculated and output.

[0086] In summary, for the calculation of road surface flatness, the input is a number of elevation data, and the other parameters are treated as constants. The calculation formula and calculation procedure have been given. The accuracy and reliability of elevation data directly affect the accuracy of the final IRI result.

[0087] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic calibration system for a vehicle-mounted road surface roughness measuring device, characterized in that: include: A vibration test platform (200) for causing a vehicle-mounted road surface roughness measuring device (100) to perform alternating linear motion; A disc (300) located within the measuring range of the vehicle-mounted road surface roughness measuring device (100); A rotating device (400) for driving the disc (300) to rotate; and a control component connected to the vibration test platform (200) and the rotating device (400); The disk (300) comprises: a first surface (310) and a second surface (320) forming a step height difference with the first surface (310).

2. A dynamic calibration system for a vehicle-mounted road surface roughness measuring device according to claim 1, characterized in that: The step height difference is 3 mm.

3. The dynamic calibration system for a vehicle-mounted road surface roughness measuring device according to claim 1, characterized in that: The angle formed by the slope formed by the first surface (310) and the second surface (320) and the vertical axis is 45°.

4. The dynamic calibration system for a vehicle-mounted road surface roughness measuring device according to any one of claims 1 to 3, characterized in that: The rotating device (400) comprises: A base (410), a rotating spindle (420) assembled in the base (410) and used for connecting to the disc (300), a synchronous pulley (430) connected to the rotating spindle (420), a servo motor (440) connected to the synchronous pulley (430), an industrial computer (460) controlling the servo motor (440) via a servo motor driver (450), a data acquisition card (470) connected to the industrial computer (460), an encoder (480) for acquiring an angular displacement pulse signal of the rotating spindle (420) and sending the angular displacement pulse signal to the data acquisition card (470), and a control panel (490) connected to the industrial computer (460).

5. A dynamic calibration system for a vehicle-mounted road surface roughness measuring device according to claim 4, characterized in that: The synchronous pulley (430) comprises: a first synchronous pulley (430a) mounted on the output shaft of the servo motor (440), and a second synchronous pulley (430b) connected to the first synchronous pulley (430a) via a synchronous belt (430c) having a toothed structure, wherein the second synchronous pulley (430b) is sleeved on the rotating main shaft (420), and the rotating main shaft (420) is a stepped structure, and a cover tube (420a) connected to the base (410) and a connecting tube (420c) are sleeved on the upper part thereof. The sleeve (420b) is arranged on a bearing plate, the bearing plate is fixed inside the base (410), an encoder (480) is arranged on one end of the rotary main shaft (420) extending from the bearing plate, and the disc (300) is fixed by a screw connection on one end of the rotary main shaft (420) extending from the base (410) and is positioned by a positioning pin (420c); the control panel (490) controls the servo motor driver (450) through the industrial computer (460) to achieve stepless speed regulation of the servo motor (440).

6. A dynamic calibration system for a vehicle-mounted road surface roughness measuring device according to claim 4, characterized in that: The servo motor (440) is fixed to the supporting plate and is located on the same side as the encoder (480), and the output shaft of the servo motor (440) passes through the supporting plate and is then assembled with the first synchronous pulley (430a), and the distance between the first synchronous pulley (430a) and the second synchronous pulley (430b) is half of the radius of the first synchronous pulley (430a).

7. The dynamic calibration system for vehicle-mounted road surface roughness measuring equipment according to claim 1, characterized in that: A protective cover (411) is arranged on the periphery of the disc (300), and the protective cover (411) is provided with a test port (411a) for testing a vehicle-mounted road surface smoothness measuring device.

8. The dynamic calibration method for a dynamic calibration system of a vehicle-mounted road surface roughness measuring device according to any one of claims 1 to 7, characterized in that: include: Adjusting the vertical height of the vehicle-mounted road surface roughness measuring device (100) so that its laser distance measuring sensor is within a normal measurement range, and adjusting the angle of the laser distance measuring sensor in the vehicle-mounted road surface roughness measuring device (100) so that its laser is vertically irradiated on the surface of the disk (300); Calculate the simulated vehicle speed. Assume that the rotation speed of the rotating spindle (420) is n (r / min), and the distance between the laser point and the axis of the rotating spindle (420) is r (mm). Then the linear speed of the point is Setting different frequencies to apply sinusoidal signal excitation to the vibration test platform (200); After the rotary device (400) and the vibration test platform (200) reach a stable operating state, the vehicle-mounted road surface flatness measurement device (100) starts to collect elevation data at a set sampling interval, stops the test when the simulated driving distance reaches a set value, and records the elevation data; The measuring points on the first surface (310) of the step of the disk (300) are called high points, and the measuring points on the second surface (320) are called low points. The average values ​​of the elevations of all high points and low points are calculated and recorded as h G and h D , then h=h G -h D ; Under dynamic calibration conditions, the elevation measurement indication error of the vehicle-mounted road surface roughness measuring device (100) is expressed as Δh=h-h0.

9. The method according to claim 8, characterized in that: The frequencies are set to 2 Hz, 5 Hz, 10 Hz, 20 Hz, 40 Hz, 80 Hz, and 100 Hz in sequence.

10. The method according to claim 8, characterized in that: The value of the rotation speed n is set to 417 r / min, and the value of the distance r between the laser point and the axis of the rotating spindle (420) is set to 159 mm.

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