CN207717565U - A kind of road surface dynamic deflection calibrating installation based on respondent behavior reconstruct - Google Patents
A kind of road surface dynamic deflection calibrating installation based on respondent behavior reconstruct Download PDFInfo
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- CN207717565U CN207717565U CN201820076640.4U CN201820076640U CN207717565U CN 207717565 U CN207717565 U CN 207717565U CN 201820076640 U CN201820076640 U CN 201820076640U CN 207717565 U CN207717565 U CN 207717565U
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Abstract
It is a kind of based on respondent behavior reconstruct road surface dynamic deflection calibrating installation belong to road performance evaluate field.Device includes rigid platfor, mimicry gearshift, controller, Waveform Input and feedback device and attachment device；Rigid platfor is fixedly connected with the ground, and line slide rail is arranged in rigid platfor upper surface, and multiple mimicry gearshifts are embedded in line slide rails, can move freely position, also can before the test begins be fixed on some position of line slide rail.Mimicry gearshift is connected by attachment device with controller, and Waveform Input is connect with feedback device with controller, and the flexure for driving mimicry gearshift to generate standard responds.This patent realizes the reproduction to dynamic deflection typical magnitude, has also paved road for dynamic deflection magnitude tracing.The present apparatus does not need removal sensor and individually calibrates, but can carry out piece calibration to equipment, and calibration result can more reflect the meter characteristic of equipment comprehensively.
Description
Technical field
It is a kind of based on respondent behavior reconstruct road surface dynamic deflection calibrating installation belong to road performance evaluate field.
Background technology
Road surface dynamic deflection test is to realize one of the important means of road performance evaluation.The most common dynamic of road industry
Deflection test equipment is drop hammer deflection meter (Falling Weight Deflectometer, abbreviation FWD), and China is being at present
Up to hundreds ensures its measurement result to the FWD equipment of military service to this kind of dynamic deflection test equipment development measurement and calibration
Accurately and reliably, it is of great significance for improving highway engineering construction maintenance level.For a long time, generally using dismounting in industry
Deflection sensor (seismic wave sensors, laser displacement sensor etc.) is directly calibrated, but from the point of view of the effect of practical application,
There are test process complicated (for example, removal sensor is time-consuming and laborious and has certain influence to equipment itself), tests for existing method
The problems such as accuracy not high (extraneous disturbance factor influences result notable in test process) and high test device maintenance cost；
Further, since existing method is " school sensor, calibration equipment is not whole ", cause calibration result and the actual metering of equipment special
Property is not fully consistent.Therefore, it is necessary to for the prior art these limitations research and develop new dynamic deflection calibration method and
Device.
Dynamic deflection：Road table vertical total displacement that pavement structure generates under dynamic loading generates in springback process
Vertical displacement, measurement unit 0.01mm.
It is calibrated currently, road surface dynamic deflection calibration test is mainly the deflection sensor dismantled in FWD equipment, wherein
Representational way is that the device of deflection sensor and certain particular form is connected development contrastive test, specifically again can
It is divided into absolute calibration method and relative calibration method.Relative calibration method is (such as the earthquake in FWD equipment of the sensor of measurement flexure
Wave sensor) all disassemble, several sensors and the higher standard of a precision are sensed with the string frame of a rigidity
Device is connected；Then string frame is stood on and carries out deflection test on ground, by comparing standard transducer and wait for school sensor
Measurement result achieve the purpose that calibration.Absolute calibration method (Fig. 1) principle is similar with relative calibration method, can be ensured using certain
The device (being usually to be fixedly connected with building foundation) of absolute rigidity will wait for that school sensor is connected with standard transducer more
Test is compared.
The prior art has the following disadvantages：
(1) measurement object is unknown, can not reappear standard deflection value, and magnitude tracing is difficult big
The measurement object of flexure calibration corresponds to the deflection value of specific flexure response process, and existing method is by both
There is road surface to apply dynamic load and obtain tested flexure, the flexure actually occurred depend on existing pavement structure performance, dynamic load,
Environmental factor (the especially temperature field condition of road surface structare layer) etc., the quantitative relationship between these factors and flexure are it is difficult to build
Vertical, thus also can not just know theoretic rebound deflection.The flexure that existing method is obtained using sensor waits for that school passes as standard to demarcate
Sensor, but cannot achieve in test next time since the conditions such as pavement structure, load, environment can not be restored completely
Reproduction to standard deflection value, leading to magnitude tracing, there are certain difficulties.
(2) school sensor, calibration equipment is not whole, and test result cannot reflect equipment meter characteristic completely
Current existing method is " school sensor, calibration equipment is not whole ".From the point of view of uncertainty of measurement, under dismounting
Come sensor itself caused by uncertainty be equipment test uncertainty one-component, also other factors (for example,
Holder is fixed unstable etc. caused by the failure of FWD equipment itself, removal sensor) caused by partial uncertainty in existing survey
It is ignored in method for testing, this result for allowing for calibration test can not reflect the whole meter characteristic of equipment completely.More how
Condition is when equipment other component breaks down, even if all the sensors are also qualification all in normal condition, calibration result, still
Equipment but can not normal use.
(3) randomness disturbance factor is affected to test result in existing method, and test result accuracy is difficult to ensure
Existing method is in concrete operations level it is difficult to ensure that datum line beam, calibration frame etc. rigidity of calibrating installations itself and absolutely
To fixation, randomness disturbance easily has an impact test result.For example, rigidity string frame is generally helped by human hand, stability is poor；
The influence of test environment apoplexy also highly significant；Absolute calibration method requires the basis of connection that must absolutely fix and not by dynamic load
It influences, also is difficult to accomplish in practice.
Invention content
This patent proposes a kind of road surface dynamic deflection calibration method and device reconstructed based on respondent behavior, overall conception
It it is the technical issues of solving standard flexure realization by the reconstruct twice to specific flexure respondent behavior, to realize pair
The measurement and calibration of deflection test equipment.It reconstructs for the first time, is the mathematics by establishing modelling for specific flexure response process
Principle obtains standard flexure model and theoretic rebound deflection；Second of reconstruct is using displacement mimicry technology standard flexure model
It is reduced to the practical flexure respondent behavior of carrying typical magnitude again, to realize realization.
The technical issues of reconstruct is solved for the first time
Modelling reconstruction is carried out by the flexure response process to 9 (or 13) measuring points on practical road surface in engineering, is carried
Go out the standard flexure response curve (table 1) of each measuring point.Reconstructing the technical issues of solving for the first time includes：It realizes to having in engineering
The principle of body pavement structure flexure respondent behavior recognizes；Meanwhile theoretical flexure is obtained according to the standard curve model of construction
Value, foundation is provided for magnitude tracing.
Table 1 corresponds to the standard flexure response model of each deflection sensor positions FWD
The technical issues of second of reconstruct is solved
Using mimicry shift technique, according to standard flexure model and by setting the movement velocity of displacement mimicry device, adding
The parameters such as speed, displacement, time realize that the hypostazation to construction flexure response theory reproduces.Second of reconstruct, solves mark
The technical issues of quasi- flexure magnitude carrier and reproduction mode.Mimicry gearshift system is to automatically control closed loop design, is used
Actuating displacement platform can accurately reappear the flexure response of random waveform, reduce the disturbance factor in test session to knot
The influence of fruit improves the reliability of calibration result.
Dynamic deflection calibrating installation described in this patent is mainly by rigid pedestal, mimicry gearshift, controller, Waveform Input
It is formed with parts such as feedback device and attachment devices, each hardware arrangement and connection type are as shown in Figure 2.
In Fig. 2,1 is rigid platfor, and 2 be mimicry gearshift, and 3 be attachment device, 4 devices in order to control, 5 for Waveform Input with
Feedback device, 6 be line slide rail.Wherein, the quantity of mimicry gearshift and position can be according to waiting for school flexure device sensor
Quantity (9~13) is adjusted on rigid platfor 1.
Rigid platfor 1 is fixedly connected with the ground, and line slide rail 6, multiple mimicry gearshifts are arranged in 1 upper surface of rigid platfor
In embedded line slide rail 6, position can be moved freely, also can be before the test begins fixed on some position of line slide rail 6.
Mimicry gearshift is connected by attachment device 3 with controller 4, and Waveform Input is connect with feedback device 5 with controller 4, and
Mimicry gearshift is driven to generate the flexure response of standard.
Wherein, mimicry gearshift is anti-by servo motor 2-1, gapless ball-screw and deceleration device 2-2, laser ruler
Feedback system 2-3, displacement platform 2-4 compositions, displacement is driven by the gapless ball-screw that servo motor drives through deceleration device
Platform accurate motion, and realize by Laser feedback system the position of workbench, set accordingly the speed of movement, acceleration, displacement,
Time.
The technical solution flow of dynamic deflection calibrating installation described in this patent is as shown in Figure 4.
Dynamic deflection calibrating installation described in this patent is by mimicry gearshift, Waveform Input and feedback device, controller
Equal critical components cooperate to realize that flexure calibration, overall technological scheme realize that process is as follows：
(1) according to quantity and the position for waiting for calibration equipment deflection sensor, the mimicry gearshift of equivalent amount is mounted on
On the corresponding position of rigid pedestal sliding rail；
(2) it will wait for that school flexure equipment is moved to right over mimicry gearshift and keeps sensor opposite with mimicry gearshift
It answers；
(3) calibrating installation is opened, self-test is booted up；
(4) start and wait for school flexure equipment, so that the measurement portion of deflection sensor is contacted the displacement portion of mimicry gearshift, open
The control program for waiting for calibration equipment, carries out the preparation of gathered data；
(5) it is required according to calibration test, selection criteria flexure responsing excitation signal excites each displacement quasi- as input signal
State device generates corresponding mimicry displacement, while record waits for the collected deflection data result of calibration equipment；
(6) result of test is recorded, and repeats (5) until testing time reaches requirement；
(7) stop calibration, preserve and export all initial data；
(8) all components reset, and close entire flexure calibrating installation.
The flexure response process on practical road surface is reconstructed by existing collimation technique magnitude tracing relatively difficult to achieve, this patent first
Then the response model of principle uses mimicry shift technique that principle model is reduced to the flexure responsive trip of reality again again
For, finally realize the reproduction to dynamic deflection typical magnitude, a kind of applicable calibration method provided for FWD equipment, also for
Dynamic deflection magnitude tracing has paved road.
Compared with prior art, the calibration method that this patent provides does not need removal sensor and individually calibrates, but can be right
Equipment carries out piece calibration, and calibration result can more reflect the meter characteristic of equipment comprehensively.
Compared with prior art, the test method of this patent effectively reduces in test session disturbance factor to the shadow of result
It rings, ensure that the accurate and reliable of calibration result.
Compared with prior art, this patent test method operation sequence is more convenient, greatly improves the efficiency of calibration.
The prior art usually requires to purchase a whole set of deflection test equipment and builds good test site, equipment purchasing
Take and the cost of civil engineering is very high, the later maintenance of test site is also the work of a time-intensive, expensive；This patent carries
The cost of the method items device element of confession is relatively low, and later maintenance is also and uncomplicated, has greatly saved cost.
Description of the drawings
The calibration method of the existing representative deflection sensors of Fig. 1
Fig. 2 dynamic deflection calibrating installation hardware connection diagrams
In Fig. 2,1 is rigid platfor, and 2 be mimicry gearshift, and 3 be attachment device, 4 devices in order to control, 5 for Waveform Input with
Feedback device, 6 be line slide rail.
Fig. 3 is mimicry displacement device structure schematic diagram
The technical solution flow chart of Fig. 4 displacements and traveling time synchronous calibration device
The technical solution flow chart of Fig. 5 specific examples 1
Specific implementation mode
This patent can be used for calibrating vehicular drop hammer deflection meter FWD, flow chart such as Fig. 5：
1 flow chart of example with reference to shown in figure 5,1 technical solution of example realize that process is as follows：
(1) according to the quantity of FWD equipment deflection sensors, same amount of displacement mimicry device is consolidated on rigid pedestal
It is scheduled on corresponding position；
(2) FWD equipment is travelled corresponding on the position face rigidity pedestal for make deflection sensor to the top of calibrating installation
Mimicry gearshift；
(3) calibrating installation is opened, self-test is booted up；
(4) start FWD equipment, deflection sensor holder is dropped into rigid table top, deflection sensor measurement portion is made to contact
The displacement platform of gearshift opens data collecting system and carries out acquisition preparation；
(5) according to alignment requirements, selection criteria flexure responsing excitation signal excites displacement mimicry device as input signal
Corresponding mimicry displacement is generated, while record waits for the collected deflection data result of school FWD equipment；
(6) result of proper testing is recorded, and repeats (5) until testing time reaches requirement；
(7) stop calibration, preserve and export all initial data；
(8) it promotes flexure holder and sails out of FWD equipment, close entire flexure calibrating installation.
This patent provides the standard flexure response model (table 2) of pavement structure corresponding position (9 or 13 measuring points).
In Solid Mechanics field, pavement structure flexure respondent behavior is a multilayered nonlinear viscoelastic or elastic-plastic material table
Face Dynamic Micro-Deformation problem has the characteristics that response time short (Millisecond), response displacement are small (micron order), carries out test to it
The difficulty of research is larger.Applicant discloses dynamic deflection response displacement, sound using numerical simulation combination laser interference method of testing
Speed and response acceleration signature rule are answered, and establishes corresponding master pattern.In this patent, standard flexure model is
The foundation of calibrating installation output displacement, thus be the important core technology of calibration method described in this patent.
This patent proposes a kind of flexure mimicry displacement implementation method and device
Flexure mimicry gearshift is by servo motor, gapless ball-screw, deceleration device and laser ruler reponse system group
At operation principle is：Drive workbench accurate by servo motor drives gapless leading screw band movable slider through deceleration device
Really movement, and by the position accurate feedback of Laser feedback system realization workbench, pass through the speed for setting movement, acceleration, fortune
The parameters such as dynamic position, time, to realize that the mimicry to flexure response process reappears.Mimicry gearshift is to realize flexure magnitude
The important technical of reproduction, thus be the important core technology of calibration method described in this patent.
This patent provides a kind of method for not needing and carrying out piece calibration to FWD equipment under conditions of removal sensor.
The flexure dynamic respond of practical pavement structure is reconstructed using mimicry shift technique, mimicry gearshift is in rigid pedestal
On can freely be adjusted to designated position, and it is corresponding with deflection sensor.Standard flexure signal is inputted by control system,
It excites mimicry device to export corresponding flexure response, reappears standard deflection value, realize the whole calibration to FWD equipment.It is this whole
Physical examination calibration method effectively overcomes the limitation of the prior art " school sensor, calibration equipment is not whole ", reflects FWD comprehensively and sets
Standby entirety meter characteristic, thus be the important improvement that this patent makes the prior art.
The standard flexure that table 2 corresponds to each deflection sensor positions FWD responds displacement model
Claims (1)
1. a kind of road surface dynamic deflection calibrating installation based on respondent behavior reconstruct, it is characterised in that：Including rigid platfor, mimicry
Gearshift, controller, Waveform Input and feedback device and attachment device；
Rigid platfor is fixedly connected with the ground, and line slide rail is arranged in rigid platfor upper surface, and multiple mimicry gearshift insertions are straight
In line sliding rail, position can be moved freely, also can be before the test begins fixed on some position of line slide rail；Mimicry displacement
Device is connected by attachment device with controller, and Waveform Input is connect with feedback device with controller, and drives mimicry displacement
Device generates the flexure response of standard；
Wherein, mimicry gearshift is by servo motor, gapless ball-screw and deceleration device, laser ruler reponse system, position
Platform composition is moved, displacement platform accurate motion is driven by the gapless ball-screw that servo motor drives through deceleration device, and
The position of workbench is realized by Laser feedback system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108333072A (en) * | 2018-01-17 | 2018-07-27 | 交通运输部公路科学研究所 | A kind of road surface dynamic deflection calibration method and device based on respondent behavior reconstruct |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333072A (en) * | 2018-01-17 | 2018-07-27 | 交通运输部公路科学研究所 | A kind of road surface dynamic deflection calibration method and device based on respondent behavior reconstruct |
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