CN104573343A - Field estimation method and simulation estimation method for flatness and comfort of bituminous pavement - Google Patents

Abstract

The invention discloses a field estimation method and a simulation estimation method for flatness and comfort of a bituminous pavement. Various data information, such as time, experimental vehicle speed, the acceleration speed data of each test point, longitude and latitude of each test road section, and image data of a test lane, in a test process can be collected in real time by a data collecting instrument adopted by the field estimation method; relatively complete data information facilitates data selection and provides theoretic data basis for subsequent performance change of road. According to the simulation estimation method, a built finished vehicle model is very close to the movement rule of a practical vehicle, so that the movement character under motivation of road roughness can be better simulated; the operation speed of a software model on a computer is 4 to 6 times faster than the actual speed, the roughness of a tested road can be quickly estimated, the estimation method is relatively few in outdoor operation and relatively low in external influence, human and material resources can be effectively saved, the mounting process of a testing apparatus is avoided, and the estimation method is more simple and convenient and shorter in required time.

Description

A kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method and method of tire

Technical field

The invention belongs to usage capability of road detection field, be specifically related to a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method and method of tire.

Background technology

Along with the development of road and the deep understanding of people's road pavement flatness impel the mankind to propose multiple testing flatness evaluation method within a nearly century, these methods roughly can be divided three classes: section class, response class and subjective evaluation class.Make a general survey of the evolution of Asphalt Pavement Surface Evenness evaluation method, can be divided into 3 stages: the 1st stage mainly found the method that truly can reflect vertical section of road surface, this one-phase considers that more factor is road surface itself; 2nd stage recognized that pavement roughness was the main cause causing Vehicular vibration, thus by the research of research emphasis from the research steering Che Yu road of simple road surface section; Human body comfort is taken into account by the 3rd stage researchist gradually, starts to seek the Asphalt Pavement Surface Evenness evaluation method based under people-car-road interaction.

Although the flatness study on evaluation way under having some scholars people to be taken into account both at home and abroad to have carried out people-car-road to interact, but these researchs are all undertaken by theory method, and theory method research has the following disadvantages: (1) auto model problem.Auto model, when carrying out theory method road pavement and carrying out flatness evaluation, is reduced to the full car auto model such as 2DOF 1/4th auto model, 4DOF half car auto model or 11 degree of freedom by researchist usually.Wherein, 1/4th auto models and single-wheel auto model, greatly differ from each other with actual vehicle, and cannot consider rotation and the inclination of vehicle; Half vehicle model take for-wheel vehicle as research object, only got half consider due to left and right vehicle wheel symmetry, and the auto model of this simplification then have ignored toppling and rotation of lateral direction of car; The foundation of multiple degrees of freedom whole vehicle model has had larger progress relative to 1/4th auto models and half vehicle model, but theory calculate can be very numerous and diverse.(2) tire model problem.Vehicle tyre is simplified to a small volume by theory method research flatness problem usually damping when carrying out tire modeling is the spring of 0 or a certain constant, have ignored the impact of actual tire damping on vibration.(3) road model problem.Road model many employings random sine wave method of superposition that theory method is set up or Road Surface Power Spectrum Density method set up grade road surface, all do not adopt actual test road surface elevation data to carry out setting up road surface model.

Summary of the invention

The object of the invention is to overcome above-mentioned deficiency, a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method and method of tire be provided, can convenient, efficiently Comfort Evaluation is carried out to road.

In order to achieve the above object, a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method, comprises the following steps:

Step one: install three-dimensional acceleration transducer, camera, GPS watch-dog, data collecting instrument and Data Holding Equipment in instruction carriage, camera can monitor the lane width of vehicle driving range, and the data of three-dimensional acceleration transducer, camera and GPS watch-dog are transferred to data collecting instrument and Data Holding Equipment;

Step 2: be numbered test segment, makes instruction carriage at the uniform velocity by any track in test section, until test terminates;

Step 3: derive the data stored, calculates root mean square of weighed acceleration to the seat three-dimensional acceleration information in each numbering section;

Step 4: according to the size of root mean square of weighed acceleration, can obtain the level of comfort of passenger, and then carries out Comfort Evaluation to Experiment Road flatness.

In described step one, three-dimensional acceleration transducer is arranged on the surface of instruction carriage pilot set, assistant driver seat and back seat left and right seat.

In described step 3, root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ².

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\∫}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

In described step 5, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially.

A kind of Asphalt Pavement Surface Evenness comfortableness method of tire, comprises the following steps:

Step one: utilize dynamics simulation software Carsim to set up whole vehicle model;

Step 2: adopt road surface elevation surveying instrument to carry out altitude figures information acquisition to any track in test section, and set up road axis elevation information, the linear information of road horizontal line and road irregularity information respectively according to measured data, these three information combination are then completed together the three-dimensional modeling on road surface;

Step 3: by the sensor localization function interface determination acceleration collection position of Carsim software, setting data acquisition channel gathers the three-dimensional acceleration of each collection position respectively, and then at Simulation Interface, the emulation speed of a motor vehicle is set, carry out people-Che-Lu interaction analog simulation;

Step 4: emulation terminates to export seat three-dimensional acceleration information, is numbered, processes the seat three-dimensional acceleration information in each numbering section, calculate root mean square of weighed acceleration to emulation section;

Step 5: according to the size of root mean square of weighed acceleration, can obtain the level of comfort of passenger, and then carries out Comfort Evaluation to Experiment Road flatness.

In described step one; set up whole vehicle model method as follows: the software inhouse E-Class car load that first selection car is corresponding is as modeling basic model; and then the amendment of E-Class basic model parameter is carried out according to actual compact car body, tire, steering system suspension braking system, power train and aerodynamic characterisitic parameter, guarantee that the properties feature of basic model uses vehicle to conform to reality.

In described step 4, root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ².

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\&Integral;}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

In described step 5, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially.

Compared with prior art, a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method, the data collecting instrument adopted can various data informations in Real-time Collection test process, as the image data etc. in the longitude of time, the test speed of a motor vehicle, each measuring point acceleration information, test segment and latitude, test track; Comparatively complete data information is conducive to the selection of data, for the follow-up pavement performance change of Experiment Road provides gross data foundation.

Further, all seating positions of three-axis acceleration sensor nearly cover car of the present invention, can the comfortableness of each seating position of rational evaluation.

A kind of Asphalt Pavement Surface Evenness comfortableness method of tire, whole vehicle model and the actual vehicle characteristics of motion of foundation are pressed close to very much, better can simulate the movement characteristic under road irregularity excitation; And the speed run on computers of software model than in real time faster 3 ~ 6 times, can evaluate Experiment Road flatness fast, this evaluation method outdoor work is less, less by ectocine, effectively can be used manpower and material resources sparingly resource, remove experimental test instrument installation process from, make evaluation method more easy, required time is shorter.

The destructiveness of road evenness can be judged according to the size of root mean square of weighed acceleration, when human feeling is for uncomfortable (weighted acceleration r. m. s. value is 0.8 ~ 1.6), show that the behaviour in service of this road is affected, reply road carries out repair.

Embodiment

The present invention will be further described below.

A kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method, comprises the following steps:

Step one: select a certain conventional car as code test car, the car that the present invention adopts in actual implementation process is that Santana 3000 car is as standard vehicle.At car driver's seat, assistant driver seat and back seat left and right seat surface, three-dimensional acceleration transducer is installed, pilot set and assistant driver seat three-dimensional acceleration transducer scheme of installation; In car, appropriate location (guaranteeing that camera can monitor the lane width of vehicle driving range) installs high-speed camera head; Install signal amplifier at car outside car roof, the GPS be connected with signal amplifier can be hand-held to facilitate real-time monitoring test car speed of operation by tester; Data acquisition and storage facilities 16 channel data Acquisition Instrument are placed in back seat appropriate location, and are connected with each acceleration transducer, high-speed camera head, GPS and Data Holding Equipment; Power supply storage battery is placed in appropriate location, car floor, and is connected with other equipment.

Step 2: start vehicle and keep stationary state, opening 16 channel data Acquisition Instruments, whether the debugging speed of a motor vehicle, each measuring point acceleration, first-class passage of making a video recording, check normal; If testing apparatus is normal, with Experiment Road design speed by Experiment Road section, this step it should be noted that keep constant vehicle speed as far as possible in process of the test, avoids changing track.

Step 3: test terminates, preserves test data, closes each equipment; The data separate DEWEsoft software of storage opened and derives test raw data, test segment is numbered (every 1km is as one section), to the data in each numbering section, and then calculating seat root mean square of weighed acceleration;

Root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ².

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\&Integral;}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

Step 4: according to seat root mean square of weighed acceleration size, the level of comfort of passenger can be obtained, and then the flatness of test segment is evaluated;

According to the corresponding relation of " automobile ride test " human body subjective feeling that (GB/T4970-2009) propose and root mean square of weighed acceleration, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially.

When the size of the weighted acceleration military root calculated meet simultaneously two kinds of different comfortablenesses experience time, consider road evenness and destroy and the factor such as rehabilitation expense, select the rank that comfortableness is poor.

After drawing comfortableness rank, according to the actual conditions at scene, the flatness of road pavement is overhauled.

A kind of Asphalt Pavement Surface Evenness comfortableness method of tire, comprises the following steps:

Step one: the present invention is using Santana 3000 as code test car; dynamics simulation software Carsim is utilized to set up whole vehicle model; modeling method is as follows: the software inhouse E-Class car load that first selection car is corresponding is as modeling basic model; and then the amendment of E-Class basic model parameter is carried out according to the characterisitic parameter of the seven large subsystems such as actual compact car body, tire, steering system suspension braking system, power train and aerodynamics, guarantee that the properties feature of basic model uses vehicle to conform to reality.

Step 2: adopt road surface elevation surveying instrument to carry out altitude figures information acquisition to a certain track, test section, and set up road axis elevation file, the linear file of road horizontal line and road irregularity file respectively according to measured data, these three combination of files are then completed together the three-dimensional modeling on road surface.

Step 3: by Carsim software sensor localization function interface setting acceleration collection position (being set in driver, copilot, the right seat of player No.5); In Carsim software, Simulation Interface setting acquisition channel gathers the three-dimensional acceleration of each measuring point respectively; Design speed according to Experiment Road sets the emulation speed of a motor vehicle; The road surface model recalling foundation can carry out people-car-road interaction analog simulation.

Step 4: emulation terminates to export each seat three-dimensional acceleration information, is numbered (every 1km is as one section) emulation section, processes the seat three-dimensional acceleration information in each numbering section, calculate root mean square of weighed acceleration;

Root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ².

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\&Integral;}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

Step 5: according to the size of root mean square of weighed acceleration, can obtain the level of comfort of passenger, and then carries out Comfort Evaluation to Experiment Road flatness;

According to the corresponding relation of " automobile ride test " human body subjective feeling that (GB/T4970-2009) propose and root mean square of weighed acceleration, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially.

After drawing comfortableness rank, according to the actual conditions at scene, the flatness of road pavement is overhauled.

The present invention, using root mean square of weighed acceleration as flatness Comfort Evaluation index, provides a kind of Asphalt Pavement Surface Evenness comfortableness field measurement evaluation method based on car load vehicle and a kind of Asphalt Pavement Surface Evenness comfortableness method of tire based on car load auto model.Bituminous Pavement actual measurement flatness comfortableness field evaluation method wherein based on car load vehicle adopts certain code test car, the collection of seat acceleration information is carried out by equipment such as installation testing test monitoring equipment, data acquisition equipment, data storage devices, calculate seat root mean square of weighed acceleration, and with reference to show corresponding with human feeling of root mean square of weighed acceleration that ISO (International Standards Organization) (ISO) provides, Experiment Road flatness comfortableness is evaluated.A kind of Asphalt Pavement Surface Evenness comfortableness method of tire based on car load auto model is then by adopting Carsim dynamics simulation software to set up whole vehicle model and Experiment Road road model, people-car-road is interacted and emulates, gather seat emulated data, calculate seat root mean square of weighed acceleration, and then with reference to show corresponding with human feeling of root mean square of weighed acceleration that ISO (International Standards Organization) (ISO) provides, Experiment Road flatness comfortableness is evaluated.Judge that Experiment Road is the need of repairing according to evaluation result.

Claims (9)

1. an Asphalt Pavement Surface Evenness comfortableness field evaluation method, is characterized in that: comprise the following steps:

Step one: install three-dimensional acceleration transducer, camera, GPS watch-dog, data collecting instrument and Data Holding Equipment in instruction carriage, camera can monitor the lane width of vehicle driving range, and the data of three-dimensional acceleration transducer, camera and GPS watch-dog are transferred to data collecting instrument and Data Holding Equipment;

Step 2: be numbered test segment, makes instruction carriage at the uniform velocity by any track in test section, until test terminates;

Step 3: derive the data stored, calculates root mean square of weighed acceleration to the seat three-dimensional acceleration information in each numbering section;

Step 4: according to the size of root mean square of weighed acceleration, can obtain the level of comfort of passenger, and then carries out Comfort Evaluation to Experiment Road flatness.

2. a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method according to claim 1, is characterized in that: in described step one, three-dimensional acceleration transducer is arranged on the surface of instruction carriage pilot set, assistant driver seat and back seat left and right seat.

3. a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method according to claim 1, it is characterized in that: in described step 3, root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ²;

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\&Integral;}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

Z-direction $w\left(f\right)=\left\{\begin{array}{cc}0.5& (0.5\mathrm{Hz}<f<2\mathrm{Hz})\\ f/4& (2\mathrm{Hz}<f<42\mathrm{Hz})\\ 1& (4\mathrm{Hz}<f<12.5\mathrm{Hz})\\ 12.5& (12.5\mathrm{Hz}<f<80\mathrm{Hz})\end{array}\right.$

X, Y direction $w\left(f\right)=\left\{\begin{array}{cc}1& (0.5\mathrm{Hz}<f<2\mathrm{Hz})\\ 2/f& (2\mathrm{Hz}<f<80\mathrm{Hz})\end{array}\right..$

4. a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method according to claim 1, is characterized in that: in described step 5, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially;

When the size of the weighted acceleration military root calculated meet simultaneously two kinds of different comfortablenesses experience time, consider road evenness and destroy and rehabilitation expense factor, select the rank that comfortableness is poor.

5. an Asphalt Pavement Surface Evenness comfortableness method of tire, is characterized in that: comprise the following steps:

Step one: utilize dynamics simulation software Carsim to set up whole vehicle model;

Step 2: adopt road surface elevation surveying instrument to carry out altitude figures information acquisition to any track in test section, and set up road axis elevation information, the linear information of road horizontal line and road irregularity information respectively according to measured data, these three information combination are then completed together the three-dimensional modeling on road surface;

Step 3: by the sensor localization function interface determination acceleration collection position of Carsim software, setting data acquisition channel gathers the three-dimensional acceleration of each collection position respectively, and then at Simulation Interface, the emulation speed of a motor vehicle is set, carry out people-Che-Lu interaction analog simulation;

Step 4: emulation terminates to export seat three-dimensional acceleration information, is numbered, processes the seat three-dimensional acceleration information in each numbering section, calculate root mean square of weighed acceleration to emulation section;

Step 5: according to the size of root mean square of weighed acceleration, can obtain the level of comfort of passenger, and then carries out Comfort Evaluation to Experiment Road flatness.

6. a kind of Asphalt Pavement Surface Evenness comfortableness method of tire according to claim 5; it is characterized in that: in described step one; set up whole vehicle model method as follows: the software inhouse E-Class car load that first selection car is corresponding is as modeling basic model; and then the amendment of E-Class basic model parameter is carried out according to actual compact car body, tire, steering system suspension braking system, power train and aerodynamic characterisitic parameter, guarantee that the properties feature of basic model uses vehicle to conform to reality.

7. a kind of Asphalt Pavement Surface Evenness comfortableness method of tire according to claim 5, it is characterized in that: in described step 4, root mean square of weighed acceleration formula is:

α _wo＝[(1.4α _wx) ²+(1.4α _wy) ²+α ² _wz] ^1/2

In formula: α _w0---total root mean square of weighed acceleration, m/s ²;

α _wx---fore-and-aft direction (i.e. X axis) root mean square of weighed acceleration, m/s ²;

α _wy---left and right directions (i.e. Y-axis) root mean square of weighed acceleration, m/s ²;

α _wz---vertical direction (i.e. Z-axis direction) root mean square of weighed acceleration, m/s ²;

Wherein, uniaxially root mean square of weighed acceleration then first by carrying out spectrum analysis to acceleration information obtain acceleration Power spectral density G to each _a(f), and then to G _af () direct integral calculates unidirectional root mean square of weighed acceleration α _w:

$a_w=\sqrt{{\&Integral;}_{0.5}^{80}{w}^2\left(f\right)G_a\left(f\right)\mathrm{df}}$

In formula: w (f)---frequency weighting function, as follows for axially different w (f) function expression:

Z-direction $w\left(f\right)=\left\{\begin{array}{cc}0.5& (0.5\mathrm{Hz}<f<2\mathrm{Hz})\\ f/4& (2\mathrm{Hz}<f<42\mathrm{Hz})\\ 1& (4\mathrm{Hz}<f<12.5\mathrm{Hz})\\ 12.5& (12.5\mathrm{Hz}<f<80\mathrm{Hz})\end{array}\right.$

X, Y direction $w\left(f\right)=\left\{\begin{array}{cc}1& (0.5\mathrm{Hz}<f<2\mathrm{Hz})\\ 2/f& (2\mathrm{Hz}<f<80\mathrm{Hz})\end{array}\right..$

8. a kind of Asphalt Pavement Surface Evenness comfortableness method of tire according to claim 5, is characterized in that: in described step 5, if weighted acceleration r. m. s. value <0.315, the subjective feeling of people is for keeping comfortable;

If weighted acceleration r. m. s. value is 0.315 ~ 0.63, the subjective feeling of people is slightly uncomfortable;

If weighted acceleration r. m. s. value is 0.5 ~ 1.0, the subjective feeling of people is that some is uncomfortable;

If weighted acceleration r. m. s. value is 0.8 ~ 1.6, the subjective feeling of people is uncomfortable;

If weighted acceleration r. m. s. value is 1.25 ~ 2.5, the subjective feeling of people is very uncomfortable;

If weighted acceleration r. m. s. value >2.0, the subjective feeling of people is uncomfortable especially;

When the size of the weighted acceleration military root calculated meet simultaneously two kinds of different comfortablenesses experience time, consider road evenness and destroy and rehabilitation expense factor, select the rank that comfortableness is poor.

9. a kind of Asphalt Pavement Surface Evenness comfortableness field evaluation method according to claim 1 and a kind of Asphalt Pavement Surface Evenness comfortableness method of tire according to claim 5, it is characterized in that: as weighted acceleration military root >0.8, road evenness comfort is subject to very important impact, needs to repair test roads.