CN107064010B - Soft clay area Road surface quality evaluation method - Google Patents
Soft clay area Road surface quality evaluation method Download PDFInfo
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- CN107064010B CN107064010B CN201611163881.4A CN201611163881A CN107064010B CN 107064010 B CN107064010 B CN 107064010B CN 201611163881 A CN201611163881 A CN 201611163881A CN 107064010 B CN107064010 B CN 107064010B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
Abstract
The invention discloses a kind of soft clay area Road surface quality evaluation methods, the present invention detects the highway pavement altitude data after settling using vehicle-mounted laser instrument, calculate vertical root mean square of weighed acceleration, root mean square of weighed acceleration is counted in each kilometer in the link length ratio of each level of comfort range, ratio calculates road-ability index D CI and riding quality index RQI according to this, evaluates ride quality according to the size of RQI.The present invention has applied widely, evaluation result high reliablity, feature with high accuracy.
Description
Technical field
The present invention relates to highway pavement ride quality assessment technique fields, more particularly, to a kind of good weak soil of adaptability
Area's Road surface quality evaluation method.
Background technique
Road users have different ride quality requirement or driving comfort phase to different grades of highway (travel speed)
It hopes.Generally, the flatness on ride quality or driving comfort and road surface is closely related, existing " highway technology status assessment mark
It is quasi- " (JTG H20-2007) method road pavement for international roughness index being used to be scaled Road surface quality index RQI
Ride quality carries out evaluation and divided rank, the evaluation are the important references of highway maintenance decision.
The Area distributions such as China's southeastern coast a large amount of weak soils, since the consolidation of soft soil foundation and secondary consolidation characteristic etc. are former
Cause is built in the highway of soft clay area, and biggish sedimentation and differential settlement are tended to occur after being open to traffic.Excessive sedimentation and
Differential settlement makes road vertical alignment be deteriorated, seriously affects ride quality or road-ability.But examined vehicle, equipment
The limitation such as calibration, operating error, international roughness index detection can react the part of the road surface in smaller range bumps, for larger
Fluctuating, fluctuation adaptability caused by sedimentation in range are poor, and often actual travel experiences the international flatness of very poor road
What testing result had been, illustrate that the adaptability of above-mentioned standard evaluation soft clay area road driving quality is poor.
Summary of the invention
Goal of the invention of the invention is the bad adaptability in order to overcome international measurement method of planeness in the prior art
Deficiency provides a kind of soft clay area Road surface quality evaluation method that adaptability is good.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of soft clay area Road surface quality evaluation method, includes the following steps:
(1) the highway garage trajectory line road surface elevation data after being settled using the detection of vehicle-mounted laser instrument, using three times
Spline Interpolation Method is fitted vertical alignment；
(2) assume that left and right vehicle wheel is symmetrical, drive at a constant speed and do not depart from road surface with tire, solve vehicle with certain speed by commenting
The vibration balancing differential equation group in valence section；
(3) pass through Fourier transform for the vibration acceleration of people and seatTime history is converted to frequency-domain frequency courseWeighted acceleration is obtained by the filter network of frequency weight function W (f), calculates root mean square of weighed acceleration aw；
(4) corresponding relationship of human comfort's degree and root mean square of weighed acceleration is set, wherein " keeping comfortable " is corresponding
Ratio be n1%, " slightly uncomfortable " corresponding ratio are n2%, " some are uncomfortable " corresponding ratio are n3%, " uncomfortable "
Corresponding ratio is n4%, " very uncomfortable " corresponding ratio are n5%, " especially uncomfortable " corresponding ratio are n6%；
(5) road-ability index D CI is calculated；
(6) riding quality index RQI is calculated；
(7) using riding quality index RQI as evaluation index, according to ride quality grading standard table, determine that unit is long
Spend the ride quality assessment technique grade of mileage.
The present invention detects the highway pavement altitude data after settling using vehicle-mounted laser instrument, extracts vehicle driving trace
The continuous elevation in road surface of line position (generally lane middle rolling car wheel path)；Calculating represents vehicle with certain speed (generally road
Road desin speed) weighted acceleration vertical due to caused by differential settlement is square during driving at a constant speed on evaluating highway
Root；Link length of statistical appraisal section (generally every kilometer) the interior root mean square of weighed acceleration in each level of comfort range
Ratio, ratio calculates road-ability index D CI and riding quality index RQI according to this, evaluates traveling matter according to the size of RQI
Amount.
The present invention generates vertical upper thread caused by excessive sedimentation and differential settlement after considering soft clay area highway operation
Shape fluctuations evaluate road running quality from the angle of road-ability, can flexibly carry out different grades of highway,
Ride quality evaluation in the case of the different lanes of multilane highway, same highway friction speed, is Maintenance Decision making, overall trip speed
Management etc. provides technical support.
The present invention considers examined vehicle, equipment calibration, road quality classification, operating error etc. in existing ride quality evaluation
The influence of aspect, the method that instead the calculated results are evaluated avoid the disturbing factor in actually detected, evaluation knot
Fruit high reliablity, precision are high.
Preferably, step (1-2) comprises the following specific steps that:
1. any time vehicle-road transactional analysis model vibration balancing differential equation group is as follows:
In formula:
ξ1、ξ2For front and back wheel road surface elevation；
2. setting
In formula, γ and β are the parameters for controlling analysis precision and stability, it is assumed that acceleration is normal within t to the t+ Δ t time
Number
3. can handy Y according to (2-2) formulat、Yt+Δt、It indicatesWith
In formula:a6
=(1- γ) Δ t, a7=γ Δ t；
4. (2-3) formula to be updated to the vibration balancing equation of t+ time Δt?
In formula,
5. Y can be acquired according to (2-4) formulat+Δt, being updated to (2-3) formula can acquireWithObtain each moment people and
The acceleration of seat
Preferably, calculating root mean square of weighed acceleration using following formula
In formula: frequency domain weighting functions W (f) can be indicated with following formula:
Preferably, utilizing formula
DCI=ω1·n1+ω2·n2+ω3·n3+ω4·n4+ω5·n5+ω6·n6Calculate road-ability index
DCI；
In formula, ωi(i=1,2 ..., 6) is corresponding weight coefficient.
Preferably, utilizing formulaCalculate riding quality index RQI；
In formula, a0、a1For coefficient.
Preferably, longitudinal pitch≤3m of actual measurement road surface elevation data.
The beneficial effects of the present invention are:
The present invention generates vertical upper thread caused by excessive sedimentation and differential settlement after considering soft clay area highway operation
Shape fluctuations evaluate road running quality from the angle of road-ability, can flexibly carry out different grades of highway,
Ride quality evaluation in the case of the different lanes of multilane highway, same highway friction speed, is Maintenance Decision making, overall trip speed
Management etc. provides technical support.
The present invention considers examined vehicle, equipment calibration, road quality classification, operating error etc. in existing ride quality evaluation
The influence of aspect, the method that instead the calculated results are evaluated avoid the disturbing factor in actually detected, evaluation knot
Fruit high reliablity, precision are high.
Detailed description of the invention
Fig. 1 is vehicle of the invention-road interaction model analysis chart；
Fig. 2 is a kind of flow chart of the invention.
Figure: people and seat 1, vehicle frame 2, front tyre 3, rear tyre 4, road surface 5.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
It include people and seat 1, vehicle in Fig. 1 if the embodiment of Fig. 1 is a kind of soft clay area Road surface quality evaluation method
Frame 2, front tyre 3, rear tyre 4 and road surface 5；Include the following steps:
As shown in Fig. 2, step 100, acquires highway garage trajectory line road surface elevation data, it is fitted vertical alignment；
Highway garage trajectory line road surface elevation data after being settled using the detection of vehicle-mounted laser instrument, using cubic spline
Interpolation method is fitted vertical alignment；
Evaluation section garage trajectory line (single direction fast right side wheel path, away from right side is detected using vehicle-mounted laser instrument
Divisional line 0.9m) road surface elevation data (xk, yk) (k=0,1 ..., n), wherein xkFor mileage pile No., ykFor road surface
Elevation.The longitudinal pitch h of datak=xk+1-xk, hk=1m, it is vertical to the highway after settling using cubic spline interpolation method
Upper thread shape is fitted, the specific steps are as follows:
1. cubic spline functions Is(x) it is the continuous piecewise interpolation function of second dervative, is on each minizone
Cubic polynomial, in all interpolation knot xkMeet Is(xk)=yk, in intermediate node xj(j=1,2 ..., n-1) meets continuity
Condition Is(xj- 0)=Is(xj+0)、Is′(xj- 0)=Is′(xj+ 0) and Is″(xj- 0)=Is″(xj+0)；
②Is(x) in section [xj, xj+1] on be cubic polynomial, so Is" (x) is in [xj, xj+1] on be linear function,
It is represented by
In formula: hj=xj+1-xj；Mj=Is″(xj), i.e. second derivative values on interpolation knot；
3. to Is" (x) is integrated twice, and according to Is(xk)=ykAnd Is(xk+1)=yk+1It determines integral constant, can obtain
The expression formula of cubic spline functions:
4. to determine Mj(j=0,1 ..., n), then to above formula derivation:
Utilize condition of continuity Is′(xj- 0)=Is′(xj+ 0) it can obtain:
(1-λj)Mj-1+2Mj+λjMj+1=dj(j=1,2 ..., n-1) (1-4)
In formula:
5. the starting point x0 and terminal xn in evaluation section supplement boundary condition Is″(x0)=Is″(xn)=0, with (1-4) formula
Composition equation group can solve Mj(j=0,1 ..., n) thus establishes cubic spline functions in the expression in each subinterval
Formula, the fitting for obtaining cubic spline interpolation are linear；
Step 200, vibration balancing differential equation group is solved
Assuming that left and right vehicle wheel is symmetrical, drives at a constant speed and does not depart from road surface with tire, solves vehicle and passed through with the speed of 120km/h
Evaluate the vibration balancing differential equation group in section；Specific solution procedure is as follows:
1. any time vehicle-road transactional analysis model vibration balancing differential equation group is as follows:
In formula:
Wherein front and back wheel road surface elevation ξ1、ξ2According to linear in step 100
Fitting function Is(x) it calculates and obtains；
2. setting
In formula: γ and β is the parameter for controlling analysis precision and stability, takes γ=0.5, β=0.25, it is assumed that in t to t+
Acceleration is constant in the Δ t time
3. can handy Y according to (2-2) formulat、Yt+Δt、It indicatesWith
In formula:a6=
(1- γ) Δ t, a7=γ Δ t；
4. (2-3) formula to be updated to the vibration balancing equation of t+ time Δt?
In formula:
5. Y can be acquired according to (2-4) formulat+Δt, being updated to (2-3) formula can acquireWithWhen thus can get each
Carve the acceleration of people and seat
Step 300, root mean square of weighed acceleration is calculated
Since human body is different to the sensitivity of the vibration acceleration in different frequency scope, by Fourier transform by people
With the vibration acceleration of seatTime history is converted to frequency-domain frequency coursePass through the filter of frequency weight function W (f)
Wave network obtains weighted acceleration, calculates root mean square of weighed acceleration aw；
In formula, frequency domain weighting functions W (f) can be indicated with following formula:
Step 400, the corresponding relationship of human comfort's degree and root mean square of weighed acceleration is set
As shown in table 2, the corresponding relationship of human comfort's degree and root mean square of weighed acceleration is set, wherein " keep relaxing
It is suitable " corresponding ratio is n1%, " slightly uncomfortable " corresponding ratio are n2%, " some are uncomfortable " corresponding ratio are n3%,
" uncomfortable " corresponding ratio is n4%, " very uncomfortable " corresponding ratio are n5%, " especially uncomfortable " corresponding ratio
For n6%；
n1Value range be " < 0.315m/s2", n2Value range be " 0.315~0.565m/s2", n3Value model
It encloses for " 0.565~0.900m/s2", n4Value range be " 0.900~1.425m/s2", n5Value range be " 1.425~
2.250m/s2", n6Value range be " > 2.250m/s2".It should be pointed out that adjacent level of comfort in 2631 standard of ISO
There are small range overlapping, table 2 of the invention takes in 2631 standard overlapping range of ISO corresponding root mean square of weighed acceleration
Value defines adjacent level of comfort；
Step 500, road-ability index is calculated
Road-ability index D CI is calculated according to the following formula:
DCI=ω1·n1+ω2·n2+ω3·n3+ω4·n4+ω5·n5+ω6·n6
In formula: ωi(i=1,2 ..., 6) is corresponding weight coefficient, is taken respectively by root mean square of weighed acceleration size
Value 0,0.315,0.565,0.9,1.425,2.25；
Step 600, riding quality index is calculated
According to road-ability index D CI, riding quality index RQI is calculated according to the following formula:
In formula: a0、a1For coefficient, for highway, it is proposed that a0Take 0.026, a1Take 0.050；
Step 700, the ride quality assessment technique grade of unit length mileage is determined
As shown in table 3, it using riding quality index RQI as evaluation index, is determined according to ride quality grading standard single
The ride quality assessment technique grade of bit length mileage.
1 parameter declaration of table
| Parameter name | Parameter value | Seat stiffness coefficient k1 | 10500N/m |
| People and seat quality m1 | 50kg | Front suspension stiffness coefficient k2 | 14985N/m |
| Front-wheel quality m2 | 26kg | Front tyre stiffness coefficient k3 | 116919N/m |
| Rear-wheel quality m3 | 65kg | Rear suspension system stiffness coefficient k4 | 35739N/m |
| Vehicle frame quality m | 638.4kg | Rear tyre stiffness coefficient k5 | 162863N/m |
| Vehicle frame rotation around center of mass inertia J | 62226kg·m2 | Seat damped coefficient c1 | 240N·s/m |
| Vehicle antero posterior axis wheelbase L | 1.840m | Front damper Equivalent damping coefficient c2 | 1082N·s/m |
| Front axle is to vehicle frame centroid distance d | 0.883m | Front tyre damped coefficient c3 | 0 |
| Rear axle is to vehicle frame centroid distance b | 1.083m | Rear shock absorber Equivalent damping coefficient c4 | 1730N·s/m |
| Seat is to vehicle frame centroid distance a | 0.757m | Rear tyre damped coefficient c5 | 0 |
Table 2
Table 3
It should be understood that this embodiment is only used to illustrate the invention but not to limit the scope of the invention.In addition, it should also be understood that,
After having read the content of the invention lectured, those skilled in the art can make various modifications or changes to the present invention, these etc.
Valence form is also fallen within the scope of the appended claims of the present application.
Claims (6)
1. a kind of soft clay area Road surface quality evaluation method, characterized in that include the following steps:
(1) the highway garage trajectory line road surface elevation data after being settled using the detection of vehicle-mounted laser instrument, using cubic spline
Interpolation method is fitted vertical alignment；
(2) assume that left and right vehicle wheel is symmetrical, drive at a constant speed and do not depart from road surface with tire, solve vehicle with certain speed and pass through evaluation road
The vibration balancing differential equation group of section；
(3) pass through Fourier transform for the vibration acceleration of people and seatTime history is converted to frequency-domain frequency courseWeighted acceleration is obtained by the filter network of frequency weight function W (f), calculates root mean square of weighed acceleration aw；
(4) corresponding relationship of human comfort's degree and root mean square of weighed acceleration is set, wherein " keeping comfortable " corresponding ratio
Example is n1%, " slightly uncomfortable " corresponding ratio are n2%, " some are uncomfortable " corresponding ratio are n3%, it is " uncomfortable " corresponding
Ratio be n4%, " very uncomfortable " corresponding ratio are n5%, " especially uncomfortable " corresponding ratio are n6%；
(5) road-ability index D CI is calculated；
(6) riding quality index RQI is calculated；
(7) it using riding quality index RQI as evaluation index, according to ride quality grading standard table, determines in unit length
The ride quality assessment technique grade of journey.
2. Road surface quality evaluation method in soft clay area according to claim 1, characterized in that step (1-2) includes
Following specific steps:
1. any time vehicle-road transactional analysis model vibration balancing differential equation group is as follows:
In formula:
ξ1、ξ2For front and back wheel road surface elevation；
2. setting
In formula, γ and β are the parameters for controlling analysis precision and stability, it is assumed that acceleration is constant within t to the t+ Δ t time
3. can handy Y according to (2-2) formulat、Yt+Δt、It indicatesWith
In formula:a6=(1-
γ) Δ t, a7=γ Δ t；
4. (2-3) formula to be updated to the vibration balancing equation of t+ time Δt?
In formula,
5. Y can be acquired according to (2-4) formulat+Δt, being updated to (2-3) formula can acquireWithObtain each moment people and seat
Acceleration
3. Road surface quality evaluation method in soft clay area according to claim 1, characterized in that utilize following formula meter
Calculate root mean square of weighed acceleration
In formula: frequency domain weighting functions W (f) can be indicated with following formula:
4. Road surface quality evaluation method in soft clay area according to claim 1, characterized in that utilize formula DCI=
ω1·n1+ω2·n2+ω3·n3+ω4·n4+ω5·n5+ω6·n6Calculate road-ability index D CI；
In formula, ωi(i=1,2 ..., 6) is corresponding weight coefficient.
5. Road surface quality evaluation method in soft clay area according to claim 1 or 2 or 3 or 4, characterized in that utilize
FormulaCalculate riding quality index RQI；
In formula, a0、a1For coefficient.
6. Road surface quality evaluation method in soft clay area according to claim 1 or 2 or 3 or 4, characterized in that actual measurement
Longitudinal pitch≤3m of road surface elevation data.
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| CN110411407A (en) * | 2018-04-28 | 2019-11-05 | 上海航鼎电子科技发展有限公司 | Measuring device and differential settlement real-time detecting system |
| CN113551636B (en) * | 2021-07-02 | 2023-06-06 | 武汉光谷卓越科技股份有限公司 | Flatness detection method based on abnormal data correction |
| CN114329726B (en) * | 2021-12-31 | 2022-08-12 | 西南交通大学 | Railway bridge forming line shape evaluation method based on train running performance |
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| CN104120644A (en) * | 2013-04-26 | 2014-10-29 | 同济大学 | Gravitational acceleration sensor based road surface flatness detection method |
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