CN102162217B - Laser dynamic deflection survey vehicle - Google Patents

Laser dynamic deflection survey vehicle Download PDF

Info

Publication number
CN102162217B
CN102162217B CN2010105617207A CN201010561720A CN102162217B CN 102162217 B CN102162217 B CN 102162217B CN 2010105617207 A CN2010105617207 A CN 2010105617207A CN 201010561720 A CN201010561720 A CN 201010561720A CN 102162217 B CN102162217 B CN 102162217B
Authority
CN
China
Prior art keywords
laser
wheel
road
measurement
doppler
Prior art date
Application number
CN2010105617207A
Other languages
Chinese (zh)
Other versions
CN102162217A (en
Inventor
李清泉
毛庆洲
付智能
曹民
张德津
Original Assignee
武汉武大卓越科技有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉武大卓越科技有限责任公司 filed Critical 武汉武大卓越科技有限责任公司
Priority to CN2010105617207A priority Critical patent/CN102162217B/en
Publication of CN102162217A publication Critical patent/CN102162217A/en
Application granted granted Critical
Publication of CN102162217B publication Critical patent/CN102162217B/en

Links

Abstract

The invention provides a laser dynamic deflection survey vehicle. The survey vehicle comprises a mobile measuring table, a measuring cross beam, a running wheel, a velocity measuring wheel, an accelerometer and a data acquiring and processing device. The laser dynamic deflection survey vehicle provided by the invention has the following advantages: according to the laser Doppler velocity measurement principle and the inertia measurement principle, during the driving process of the vehicle at a normal traffic velocity (15-80km/h), a plurality of laser Doppler vibration meters arranged in the front of loading wheels of the vehicle synchronously measure the relative movement velocity of various measuring points on a road surface; the instantaneous deflection deformation velocity of the road surface is obtained through inertia compensation calculation; and a dynamic deflection value of the road surface is obtained through inversion by utilizing a road layered elastic mechanical model and used for general investigation and assessment of the bearing capacity of a road network.

Description

The dynamic Laser flexure is measured car

Technical field

The present invention relates to a kind of flexure and measure car, relate in particular to a kind of dynamic Laser flexure and measure car, the flexure that can be widely used in speedway, state's provincial highway, urban road and airfield runway in the field of traffic is measured.

Background technology

Since nineteen sixty, laser doppler technique is owing to have high room and time resolution ratio in measurement, contact measurement object not, not disturbance measuring object, the object that the original velocity measuring technique of energy measurement is difficult to measure and noticeable.1964, after YEH and CUMMIUS had delivered the 1st piece of paper that tests the speed about laser doppler technique, this technology received the attention of each side immediately and has carried out a large amount of theory analysises and experimental study, obtained significant achievement.After the seventies, foreign vendor has begun more complete product is provided and is bringing in constant renewal in to market.Laser-Doppler vibration measuring technology becomes indispensable detection method in science and technology and the many industries now, and oneself has developed into the vibration measurement field through the tachometric survey from fluid and solid.

Vibration measurement is because can reflect the dynamic characteristic, particularly swiftly passing object of object, and is very important in engineering.Laser doppler vibrometer has developed into the multiple beam measurement since the shake invention of research institute of light of nineteen eighty-three University of Southampton from single beam, the light velocity measurement that intersects.It is to utilize the differential type LDV to carry out twisting vibration to measure that vibration measurement with laser begins most, and the theory of the appearance of laser twisting vibration subsequently begins independent development, has obtained very big achievement.The B&K company of producer of world-renowned production laser doppler vibrometer research and to produce marque be 2523 laser torsiograph.Used single laser interferometer in this product.And having comprised two laser interferometer in the product in same well-known German Polytec company 4000 series, measurement effect has obtained further raising.Research departments such as domestic University Of Tianjin, Xi'an Communications University have also carried out corresponding research.

LDV (vibration measuring) technology is come from the laser velocimeter technical development the earliest.Its physical principle is to survey the catoptrical Doppler frequency shift of returning from the moving object scattering.Fig. 9 is the single beam light channel structure that tests the speed.

The frequency of being sent by laser instrument is that the f laser beam incides measured surface through spectroscope, because the motion of surface measurements, reverberation will produce Doppler frequency shift f D:

f D = 2 v λ

In the formula, v is a surface movement velocity, goes into to be Wavelength of Laser.Frequency is f+f rReference beam and frequency be f+f DReverberation mixes and projects and produced beat signal on the photodetector, and through the electronic signal process system, obtaining frequency at last is f D-f rThe signal of telecommunication of beat frequency, it is just analyzed and handles can obtain required vibration signal.Owing to mixed reference beam, this light channel structure can be told the direction of motion of measured surface.

Deflection basin is meant the similar peviform distortion that the road surface forms under load action, be the summation of road surface elastic deformation and plastic strain, and deflection basin can reflect the supporting capacity situation on road surface effectively.In the highway in China pavement design, the deflection basin radial design value of flexible pavement is 3.6 meters, and the deflection basin radial design value of semi-rigid pavement is 5.4 meters.

The detection of pavement deflection is the basis of estimating the road surface bearing capacity; Most important for construction quality control with check; In addition, it is also determining the scientific level and the confidence level of road network Maintenance Decision making, directly influences the reasonability of maintenance fund allocation and old road improvement and design.Though the equipment and the method for countries in the world tests flexure are different, be identical to the understanding of flexure basic conception.The flexure definition generally is meant total vertical deformation value (total flexure) or the vertical rebound deformation value (rebound deflection) that roadbed or road surface produce in the position, load action lower whorl crack of required standard car, is unit with 0.01mm.

The reasonable definition of road structure bearing capacity is: road structure before reaching unacceptable structural destruction or functional destruction, the number of pass times of the certain type of vehicle that can bear.It is generally acknowledged; The structural destruction that flexible pavement cracking causes main with surface material in maximum tension stress or maximum stretching strain relevant, the road surface occur rut or planeness reduce the functional destruction of causing main with basic unit or roadbed granular material in maximum crushing stress or maximum compressive strain relevant.

China's Flexible Pavement Design be with the modulus of resilience as design parameters, control index with flexure as mechanics.Its mechanics is defined as the surperficial vertical displacement component of model under the vertical force effect, promptly subgrade and pavement under load action, the vertical deformation that end face takes place.Though a large amount of practices and research data surface, there are not simple linear relationship in roadbed flexure and its bearing capacity, and flexure has still reflected the supporting capacity of subgrade and pavement to a certain extent.Directly the application surface flexure has tangible advantage as the index of bearing capacity assessment, because field measurement is easy, does not also need the additional calculation analysis.

Over nearly 20 years, in the world the development of pavement detection and assessment technique very rapidly, general trend is: develop to test technique automatic by manual detection, detect to no damaged detection technique by damaged type and develop, by general technology to hi-tech development.

Flexure is the important indicator of reflection road structure performance, and therefore, the research and development of pavement deflection detection technique earn widespread respect always in the world.Traditional Beckman beam is progressively replaced by autodeflectometer, vibrating type benkelman beams deflectometer and FWD (Falling Weight Deflectometer is called for short FWD).Fast, high, the easy to operate FWD test macro of precision that particularly tests the speed, more than 60 country is used widely in the world.FWD combines with the road structure back analysis software of practicability, pavement deflection is detected with the scientific level of bearing capacity evaluation bring up to a new stage.

Along with the continuous development of pavement detection and assessment technique, road pavement follow the tracks of to detect and long-term functional performance research pay attention to day by day in the world, and with this as the main path that improves pavement design.Such as, former West Germany has set up 170 long-term observation highway sections, has carried out the tracking observation in 18 years, and Semi-Rigid Pavement Structure has been had deeply and the understanding of system.Britain has set up 400 long-term observation highway sections, according to tracking observation and analysis and research result, has revised pavement design method in 1986.The strategic highway research program (SHRP) that the U.S. came into effect in 1988, one of main research contents are that detection and long-term functional performance research (LTPP) are followed the tracks of in the road surface.

After FWD, benkelman beams deflectometer RWD of new generation (Rolling Wheel Deflectometer, roller type benkelman beams deflectometer) is in conceptual phase.It is to adopt high frequency lasers scanning, the test carriage flexure that table produces on the road during record goes continuously, the about 88.5km/h of test speed.The mechanisms such as RDT that mainly contain ARA (Applied Research Associates) company and the Sweden of Dynatest (Denmark) and Quest Integrated (U.S.) cooperation, Mississippi, America at present are engaged in the development work of RWD; First generation product comes out, and precision is suitable for the road network generaI investigation.The GreenWood company of Denmark also developed based on laser Doppler measuring principle high-rate laser autodeflectometer (Traffic Speed Deflectometer, TSD).

So far, domestic pavement detection still mainly relies on the Beckman beam of introducing the sixties in 20th century, and it tests the speed slowly, low, the poor reliability of precision, and only is applicable to flexible pavement.The existing flexible pavement total kilometrage of China surpasses 300,000 km, and as being basic maintenance unit with districts and cities Highway Administration Bureau (locate, complete cross section), then the about 900km of the average maintenance mileage of each unit surveyed full journey need 3~4 months with the Beckman beam.Obviously, the actual needs of this detection means incompatibility modern road surface management.Beckman beam detection method is directly restricting the raising of road surface evaluation on bearing capacity and reinforcement design level.Because road structure is a multilayer system, it is inadequate that single-point (maximum) flexure that only detects according to the Beckman beam is estimated bearing capacity of pavement structure.Theory analysis and engineering practice show that all there are not simple relation in maximum flexure in road surface and supporting capacity.

The supporting capacity of road structure depends primarily on its stress-strain state, and the flexure that observes with the Beckman beam is estimated the road surface supporting capacity and had tangible irrationality.Since the eighties in 20th century; Along with FWD progressively is used widely; Receive generally attention in the world according to deflection basin information inverse road surface structare layer modulus and then evaluation road surface supporting capacity, and demonstrate the tremendous economic social benefit that new and high technology is brought.Yet it is reported that China overwhelming majority FWD Subscriber Units do not have supporting analysis software, FWD also only as a kind of high-precision flexure measuring apparatus using, do not given play to its due effect.

The JG-2005 type laser autodeflectometer of Ministry of Communications's highway Research Institute is used to carry out the pavement strength index and detects.JG-2005 type laser autodeflectometer is made up of equipment load wagon, measuring mechanism, data collecting system three parts jointly.Load wagon adopts 6 meters major axis of red rock steyr king apart from chassis special.Measuring mechanism is made up of bilateral mechanism for testing, guiding mechanism, the hoisting mechanism of moving one's steps, hoisting mechanism.Data collecting system is made up of data acquisition computer, slave computer, laser range sensor, wireless system for transmitting data.

JG-2005 type laser autodeflectometer is exactly the automation form of Beckman beam; Measurement bay pulls chassis below with being installed in, cooperates move one's steps system, data collecting system of guiding mechanism, bend measurement synchronization control system, measuring mechanism to constitute the laser autodeflectometer jointly.

The operating principle of JG-2005 type laser autodeflectometer is identical with the operating principle of Beckman beam, all is to utilize lever principle, measures the distortion on road surface through the displacement of lever.

In actual test process, testing jig is placed on the road surface, the accurate face of first three some primordial of testing jig, and the indication of gage beam lever is on this datum, and laser sensor also is installed on this datum.When the inspection vehicle trailing wheel to overtake, when the test carriage trailing wheel moved closer to test point, the vertical load that bear on the road surface at test point place increased land subsidence gradually.Be placed on gage beam rear end on the test point simultaneously also along with the sinking on road surface moves down, drive the laser reflecting surface simultaneously and move down, laser range sensor just can be measured the corresponding displacement in measuring point place, the just deflection value on road surface.

The laser autodeflectometer is when carrying out the pavement deflection detection. and measurement bay is positioned on the road surface. and automobile advances with a constant speed, because the effect of guiding mechanism, the gauge head of gage beam is just aimed at the wheel crack of the left and right trailing wheel of test carriage.Along with automobile to overtake. gauge head position load increases gradually. deflection value becomes big gradually; Gauge head is also along with the change of deflection value moves down greatly. the process of this variation of data collecting system record; Cross the line 15cm of rear shaft center up to gauge head; Stop data acquisition, calculate this process flexure curve and deflection basin peak value simultaneously.After accomplishing this sense cycle, the hoist engine of moving one's steps drags measuring mechanism forward with the speed of 2 times of speed of a motor vehicle, surpasses preceding photoelectric tube up to lead, stops straining beam, carries out next step measurement.So far, accomplished a complete measuring process.

Summary of the invention

All less than 5 kilometers/hour, there is potential safety hazard in main flow deflection test means, influences shortcoming such as normal traffic in the test process aspect speed at first, at present; The present invention mainly solves under the normal traffic velocity conditions, i.e. continuous deflection test under the 15-80km/h condition;

Secondly, traditional deflection test adopts high-precision laser range sensor directly to measure the flexure deflection on road surface, because the complicacy of road surface texture, the method can only static conditions, is not suitable for measurement dynamic condition under; The present invention adopts many pavement deflection rate of strain at multiple spot place, beam LDV sensor measurement road surface altogether, calculates the dynamic deflection value on road surface according to the elastic deformation theory and the model inversion on road surface again, goes for measuring under the dynamic condition;

Once more; Owing to carry car in the process of moving, because the injustice and the vehicle self of road, with the generation vibration of jolting; Traditional method adopts accelerometer to compensate; Because accelerometer need obtain displacement to the quadratic integral of time, compensation result drift in time is difficult to control, thereby can not lean against the measured value of compensation laser displacement sensor in the vehicle dynamic driving process; The present invention adopts attitudes such as pitching that the optical fibre gyro measuring vehicle produces in the process of moving and roll to change, and obtains pitching and the roll angle speed of car body, to compensate the velocity variations that produces between vehicle movement and the ground.

At last, traditional method can't be measured the true dynamically flexure on road surface, because moment is rolled at the wheel of vehicle of motion in the road surface, does not have good methods to measure its short time set amount; The present invention is according to accelerometer inertia measurement principle; Pre-buried accelerometer on the road surface of reality; Through gathering the acceleration evaluation of wheel through road surface point moment at this accelerometer place; Obtain the rate of strain of moment through time integral, quadratic integral obtains deflection (being the transient state deflection value).

Following table is that dynamic Laser flexure of the present invention is measured the comparison form between car and the traditional flexure measureing equipment:

Traditional flexure measureing equipment mainly is Beckman beam, laser automatic equipment in rebound deflection testing and FWD etc.; Measuring accuracy is low, speed is slow, repeatability is poor; General measure speed wastes time and energy less than 5 kilometers, uses dangerous big; Particularly the speedway in utilization can't use basically.The objective of the invention is to realize fast, the flexure of high accuracy, high reliability measures.

In order to achieve the above object, the invention provides a kind of dynamic Laser flexure and measure car, it comprises the traverse measurement platform, measures crossbeam, active wheel, fifth wheel, accelerometer and data acquisition and treating apparatus;

Wherein,

Said traverse measurement platform comprises tractor and trailer, for said measurement crossbeam, said synchronously and signal processing apparatus and said data acquisition and treating apparatus the lift-launch platform is provided; Said tractor draws said trailer and advances, and the trailing wheel of said trailer is an active wheel;

Said measurement crossbeam is positioned on the said trailer, is installed in the top, wheel crack of said active wheel, mainly is made up of the laser beam directive road surface of said laser doppler vibrometer crossbeam skeleton, laser doppler vibrometer and fibre optic gyroscope;

Said laser doppler vibrometer, its number are 4-7, are arranged on the said crossbeam skeleton; One of them said laser doppler vibrometer is a reference laser Doppler vialog, and the distance between the said active wheel center is greater than the radius of deflection basin; Other 3-6 said laser doppler vibrometer is Laser Measurement Doppler vialog, and the distance between the said active wheel center is less than the radius of deflection basin;

Laser center line that said laser doppler vibrometer sends and the angle θ between the vertical direction are that 1.5 degree are to 2.5 degree;

The number of said fibre optic gyroscope is 3; 3 fibre optic gyroscopes become orthogonal space to arrange; Said fibre optic gyroscope is arranged on the said crossbeam skeleton; Fibre optic gyroscope is measured three axis angular rates of said crossbeam skeleton in inertial space, is used to compensate the crossbeam skeleton because angular movement causes the range rate error of laser doppler vibrometer;

The measurement result of said reference laser Doppler vialog, said Laser Measurement Doppler's vialog and said fibre optic gyroscope is transferred in said data acquisition and the treating apparatus;

Said active wheel can guarantee in the process of running, does not block or interferes laser;

Said fifth wheel mainly is made up of wheel, wheel fixed mount and optical rotary encoder, and this wheel is fixed on the said crossbeam skeleton by this wheel fixed mount; This optical rotary encoder is installed on this wheel, is used to measure the instantaneous speed of service of this wheel, and should the instantaneous speed of service be sent in said data acquisition and the treating apparatus;

Said accelerometer is embedded in the road surface, is used to measure said traverse measurement platform through road surface brief acceleration value, and this accekeration is sent in said data acquisition and the treating apparatus;

Said data acquisition and treating apparatus are used for the instantaneous deflection value according to the data computation road surface that receives.

Compared with prior art, the dynamic flexure in road surface of the present invention is measured car, can be in 15-80 kilometer/hour velocity interval the deflection value on continuous measurement road surface, measuring speed is fast, the measuring speed excursion is wide,

Description of drawings

Fig. 1 is the structure chart that dynamic Laser flexure of the present invention is measured car;

Fig. 2 is the structure chart that dynamic Laser flexure of the present invention is measured the measurement crossbeam of car;

Fig. 3 A is the surface deformation sketch map under the loading;

Fig. 3 B is near the surface deformation VELOCITY DISTRIBUTION sketch map the loading zone;

Fig. 3 C is near the surface deformation amount distribution schematic diagram the loading zone;

Fig. 4 is a distortion slope S definition sketch map;

Fig. 5 is the compensation sketch map of surface deformation speed;

Fig. 6 is the compensation sketch map of fibre optic gyroscope of the present invention;

Fig. 7 is a pavement deflection distorted pattern graphoid;

Fig. 8 A is an accelerometer scheme of installation of the present invention (vertical view);

Fig. 8 B is an accelerometer scheme of installation of the present invention (sectional view);

Fig. 9 is the single beam light channel structure figure that tests the speed.

The specific embodiment

Dynamic Laser flexure of the present invention is measured car and is utilized LDV principle and inertia measurement principle; At vehicle with normal traffic speed (in 15~80km/h) driving process; By the road surface speed of related movement that is installed in preceding a plurality of each measuring point of laser doppler vibrometer synchro measure of car load wheel; After inertia compensation calculating, obtain the instantaneous flexure rate of strain on road surface, again through road stratiform Elasticity model; Inverting obtains the dynamic deflection value in road surface, is used to generally investigate and assess the supporting capacity of road network.

As shown in Figure 1, dynamic Laser flexure of the present invention is measured car and is comprised traverse measurement platform, measurement crossbeam 11, active wheel 12, shelter 13, environment holdout device (not shown), fifth wheel, balancing weight 14, accelerometer (not showing among Fig. 1), synchronous and signal processing apparatus (not showing among Fig. 1), data acquisition and treating apparatus (not showing among Fig. 1) and supply unit;

Wherein, said traverse measurement platform comprises heavy hauler 101 and said trailer 102, and each equipment of measuring for pavement deflection provides the lift-launch platform.Said heavy hauler 101 possesses powerful tractive force and good handling; Said trailer 102 possesses favorable rigidity and stationarity, and said active wheel 12 is the trailing wheel of said trailer 102, and the air spring shock mitigation system is adopted in its suspension.

Said shelter 13 and said environment holdout device are for measuring crossbeam 11, providing with signal processing apparatus and data acquisition and treating apparatus and seal and working environment that temperature suits synchronously.

Said shelter 13 mainly is made up of steel frame, aluminium extruded sections cover plate and insulated fire expanded material, possesses good heat insulation, sound insulation and sealing performance, is arranged on the said trailer 102 and covers at said measurement crossbeam 11 tops;

Said environment holdout device mainly is made up of on-board air conditioner, warm-air drier and compressor, is arranged at said shelter 13 inside, is the working environment of 25 ℃ ± 2 ℃ of said shelter 13 inner sustain, and the air pressure of keeping in the said shelter 13 is out of my cabin 1.1-1.2 times.

As shown in Figure 2; Said measurement crossbeam 11 is positioned on the said trailer 102, is installed in the top, wheel crack of said active wheel 12; Mainly constitute the laser beam directive road surface of said laser doppler vibrometer 112 by crossbeam skeleton 111, laser doppler vibrometer 112 and fibre optic gyroscope 113;

Said laser doppler vibrometer 112, its number are 4-7, are arranged on the said crossbeam skeleton 111; One of them said laser doppler vibrometer 112 is a reference laser Doppler vialog, and the distance between the said active wheel center is greater than the radius of deflection basin; Other 3-6 said laser doppler vibrometer 112 is Laser Measurement Doppler vialog, and the distance between said active wheel 12 centers is less than the radius of deflection basin;

Laser center line that said laser doppler vibrometer 112 sends and the angle θ between the vertical direction are 1.5 ° to 2.5 °;

The number of said fibre optic gyroscope 113 is 1-3; Said fibre optic gyroscope 113 is arranged on the said crossbeam skeleton; This fibre optic gyroscope is measured the motion instantaneous angular velocity of crossbeam skeleton, the speed of the extra generation that causes with jolting of in motion process, producing of compensated measurement crossbeam;

Preferably; The number of said fibre optic gyroscope 113 is 3; 113 one-tenth orthogonal spaces of 3 fibre optic gyroscopes are arranged; Said fibre optic gyroscope 113 is arranged on the said crossbeam skeleton 111, and fibre optic gyroscope 113 is measured three axis angular rates of said crossbeam skeleton 111 in inertial space, is used to compensate crossbeam skeleton 111 because angular movement causes the range rate error of laser doppler vibrometer;

The measurement result of said reference laser Doppler vialog, said Laser Measurement Doppler's vialog and said fibre optic gyroscope 113 is transferred in said data acquisition and the treating apparatus;

Said accelerometer is embedded in the road surface, the accekeration that is produced when being used to measure said traverse measurement platform through the road surface, and this accekeration a is sent in said data acquisition and the treating apparatus.

Said a data acquisition of this accekeration and treating apparatus are handled, according to following formula to obtain the instantaneous velocity v on road surface tWith deformation values d t

v t=at

d t = 1 2 At 2 , Wherein, t is the time

As shown in Figure 2, according to a kind of concrete embodiment, said measurement crossbeam 11 is made up of 112,3 fibre optic gyroscopes 113 of 111,4 laser doppler vibrometers of crossbeam skeleton of steel.Said measurement crossbeam 11 is placed in the top, wheel crack of said active wheel 12, the vertical directive of the laser beam of said smooth Doppler's vialog 112 road surface;

Wherein three laser doppler vibrometers 112 are Laser Measurement Doppler vialog, and a laser doppler vibrometer 112 is a reference laser Doppler vialog;

100 millimeters in the place ahead at the said active wheel of first Laser Measurement Doppler vialog distance 12 centers; 300 millimeters in the place ahead at second the said active wheel of Laser Measurement Doppler vialog distance 12 center; 750 millimeters in the place ahead at the 3rd the said active wheel of Laser Measurement Doppler vialog distance 12 centers, 3600 millimeters in the place ahead of the 4th the said active wheel 12 of reference laser Doppler vialog distance; 3 fibre optic gyroscope 113 modes of being orthogonal are fixed on the middle part of said crossbeam skeleton 111.

Preferably; Said Laser Measurement Doppler's vialog is three; 100 ± 10 millimeters in the place ahead at the said active wheel of one said Laser Measurement Doppler's vialog distance center; 300 ± 10 millimeters in the place ahead at the said active wheel of another said Laser Measurement Doppler's vialog distance center, 750 ± 10 millimeters in the place ahead at the said active wheel of another said Laser Measurement Doppler's vialog distance center; 3600 ± 100 millimeters in the place ahead at the said active wheel of said reference laser Doppler vialog distance center;

Said fifth wheel mainly is made up of wheel 151, wheel fixed mount 152 and optical rotary encoder, is used to measure the speed of service and the distance that flexure is measured car.This wheel 151 is fixed on the said crossbeam skeleton 111 by this wheel fixed mount 152; This optical rotary encoder is installed on this wheel 151, is used to measure the instantaneous speed of service of this wheel 151, and should the instantaneous speed of service be sent in said data acquisition and the treating apparatus.

Standard tire and connector that said active wheel 12 has been transformed wheel hub by two processes are formed, and its special feature is the laser that can guarantee in the process of running, not block or interfere contiguous laser doppler vibrometer.

Said balancing weight 14 is made up of the lead and the fixed case of constant weight, is removably installed on the said active wheel; The weight size of said balancing weight 14 can guarantee that said active wheel 12 ground pressures are 100,000 Ns, simultaneously can be easily installation and removal from said active wheel 12 chassis.

Said synchronously with signal processing apparatus by vehicle location and synchronization control circuit, and sensor signal processing circuit composition.The signal that this vehicle location and synchronization control circuit reception GPS and said optical rotary encoder send, after treatment, Time Created and linear space benchmark, and generate the sensor synchronous control signal; The different classes of signal of output that this sensor signal processing circuit is mainly used in each sensor changes into the voltage signal of standard, so that the collection of data acquisition computer and processing.

Said data acquisition and treating apparatus are made up of multi-channel data acquisition card, data acquisition computer, data handling machine and the network switch.This data acquisition and treating apparatus are gathered the voltage signal of each sensor output through being installed in the inner multi-channel data acquisition card of data acquisition computer, are transferred to the instantaneous deflection value that the data handling machine post processing obtains the road surface through the network switch.

Said supply unit mainly is made up of hydraulic generator 161, UPS (not showing among Fig. 1) and switchboard (not showing among Fig. 1), and each power device of measuring car for flexure provides stable power and control corresponding mode.

Dynamic Laser equipment in rebound deflection testing of the present invention adopts a plurality of laser doppler vibrometers to measure surface deformation speed.This sensor is through measuring the rate of strain that the road surface is measured in the laser light reflected frequency displacement.Doppler's vialog is installed on the rigid beam, makes a plurality of laser doppler vibrometers be synchronized with the movement.The dynamic Laser equipment in rebound deflection testing is installed in deflection basin inside with three laser doppler vibrometers, and a laser doppler vibrometer is placed in the deflection basin outside, as a reference value.Three are installed in 100,300 and 750 millimeters places that the inner laser doppler vibrometer of deflection basin is placed on front, active wheel center.Fibre optic gyroscope is installed on the crossbeam to monitor the motion state of crossbeam.

Fig. 3 A shows the surface deformation velocity of said active wheel 12 under axle load 100KN;

Fig. 3 B, Fig. 3 C are respectively that load center region deformation VELOCITY DISTRIBUTION sketch map is being out of shape the result shown in the slope with corresponding deflection basin (right side).

The distortion slope S is defined as the ratio of surface deformation speed and travel speed, and is as shown in Figure 4.The distortion slope S is the deformation displacement derivative, thereby can be used for displacement calculating.This means that it can obtain the supporting capacity parameter of road, like structural bending index SCI300, (SCI300=DO-D300's) and center deflection value (DO) are based on measures the distortion slope value.

Under desirable duty, laser doppler vibrometer needs continuous speed input.This can not be through being mounted to laser sensor complete plumbness, wheel suspension that they can the measuring vehicle alterable height moved realize.This problem is installed laser doppler vibrometer through and the about 2 ° angle mode of vertical direction about with the laser center line and is solved.The speed input of an approximately constant is provided like this, as the horizontal component of the velocity component of vehicle, and little to the measurement influence of vertical speed.Have an appointment 2 ° angle of the installation of laser and vertical direction makes the measured speed value comprise:

The horizontal movement speed of-measurement car;

Vertical and the horizontal movement speed of-vehicle hanging;

The vertical flexure speed on-road surface.

As shown in Figure 5, establishing the horizontal movement speed of measuring crossbeam is v v, the center line of laser doppler vibrometer and the angle of vertical direction are θ, Laser Measurement Doppler's vialog is output as v i, reference laser Doppler vialog is output as v Ver, following formula is then arranged:

v di=v i-v v×cosθ

v dver=v ver-v v×cosθ

Owing to measuring car in running, because the effect of the uneven and suspension on road surface detects crossbeam and will produce elevating movement, the angular velocity of establishing this motion is ω, and is as shown in Figure 6, and following formula is then arranged:

v di=v def+v ver+d×ω

Here v DefBe the flexure rate of strain of road surface under loading, that is:

v def=v di-v ver-d×ω

The distorted pattern on road surface has adopted based on such hypothesis: road structure is as the elasticity crossbeam on the basis that is placed in spring, and is as shown in Figure 7.This can be showed by Euler-Bernoulli equation, and wherein F is the normal pressure of this point, and E is a rigidity, and I is current dynamic moment of inertia, and h is the thickness on road surface, and k is a coefficient of elasticity.

Corresponding differential equation as shown in the formula, w (x) is the impulse Response Function of stress action spot along the flexure warping function of crossbeam direction (x direction), δ (x), promptly;

EI d 4 dx 4 w ( x ) + kw ( x ) = - Fδ ( x ) ;

Separating of this differential equation is a parameter model about A and B, X >=0 wherein, A>0, B>0.Their separate and path index see the following form.

Table: the separating of two parameter Euler-Bernoulli equations

Dynamic flexure of the present invention is measured car and is adopted accelerometer to measure the dynamic flexure that is produced when dynamic Laser flexure of the present invention is measured car through the road surface, to demarcate the parameter of native system.This scheme adopts an accelerometer to measure the dynamic flexure amount on road surface.According to a kind of specific embodiment, accelerometer is selected the 2220-05 type accelerometer of Silicon Design company, and the range of this accelerometer is ± 5g.

Shown in Fig. 8 A; Accelerometer 83 is fixed on the steel mount pad 82, and this steel mount pad 82 is the bottom surface of the disk of steel, and on road surface 81, digs a circular holes; Steel mount pad 82 is embedded in this hole, and its power line is guided in the link box in roadside through a grooving.

The screw that this accelerometer 83 passes through two M3 is on a steel mount pad 82, and it is solid to use 702 glue to cement.The hole that digs on the road surface will have a step, is used for fixing steel mount pad 82 on the step, is lower than road surface 2-5mm above the steel mount pad 82.The darker hole that the center is dug is used for to accelerometer 83 vacating spaces, prevents that accelerometer 83 is destroyed.The epoxide-resin glue of steel mount pad 82 usefulness black is bonded in the circular hole of road surface, and with this glue this circular hole is filled and led up to the road surface 81 identical height.

The holding wire of accelerometer 83 causes in the junction box in roadside through a grooving that 25mm is dark, 5mm is wide, after holding wire is imbedded this groove, also with the epoxide-resin glue of black this groove is filled and led up.The signal line terminal of accelerometer 83 is put into a junction box of imbedding the roadside, and carries out the connection plug with data collecting card.

Behind the output signal process A/D transition card of accelerometer 83, be input to portable computer, pocket computer writes down the instantaneous acceleration value a on road surface, and this accekeration is handled as follows, to obtain the instantaneous velocity v on road surface tWith deformation values d t

v t=at

d t = 1 2 at 2

A kind of specific embodiment that dynamic Laser flexure according to the invention is measured car according to the road surface under the rolling pressure of the wheel of standard weights; The rate of strain at preceding 100 millimeters, 300 millimeters and the 750 millimeters places of wheel center is according to the dynamic deflection value on the Euler-Bernoulli equation Inversion Calculation road surface of Elasticity;

The dynamic Laser flexure is measured car and is adopted a plurality of laser doppler vibrometers to measure the rate of strain on road surface; Wherein in deflection basin, be provided with 3-6 laser doppler vibrometer; The another one laser doppler vibrometer is installed in outside the deflection basin, is used for the reference value as tachometric survey;

The dynamic Laser flexure is measured car and has been adopted 1-3 fibre optic gyroscope, is used to monitor the motion state of measurement crossbeam, the angular movement that in motion process, produces with the compensated measurement crossbeam;

The dynamic Laser flexure is measured car and has been adopted a custom-designed range finding wheel, and an optical rotary encoder has been installed, and is used for the instantaneous speed of service of measuring vehicle; After the output signal of optical rotary encoder is handled through frequency division, obtain dutycycle and be 1: 1 square-wave pulse, be directly inputted to the A/D capture card, obtain the instantaneous velocity of inspection vehicle through behind the high frequency sampling;

The dynamic Laser flexure is measured car and has been adopted the multi-channel synchronous data acquisition card, and tachometer signal, gyroscope signal, pavement temperature signal, the wheel encoder device signal of laser doppler vibrometer are realized synchronous acquisition;

The dynamic Laser flexure is measured car and has been adopted on the test road surface pre-buried accelerometer to accomplish the dynamic calibration of system.

The dynamic flexure in road surface of the present invention is measured car, can be in 15-80 kilometer/hour velocity interval the deflection value on continuous measurement road surface, measuring speed is fast, the measuring speed excursion is wide; (traditional method speed is too slow, is generally less than 5 kilometers/hour, belongs to static measurement basically)

The dynamic flexure in road surface of the present invention is measured car, and sample frequency is high, general output valve of 0.1m; (traditional method sample frequency is low, generally is measuring point of 20m or measuring point of 50m)

More than explanation is just illustrative for the purpose of the present invention; And nonrestrictive, those of ordinary skills understand, under the situation of spirit that does not break away from following accompanying claims and limited and scope; Can make many modifications, variation or equivalence, but all will fall in protection scope of the present invention.

Claims (5)

1. a dynamic Laser flexure is measured car, it is characterized in that, it comprises the traverse measurement platform, measures crossbeam, active wheel, fifth wheel, accelerometer and data acquisition and treating apparatus; Wherein,
Said traverse measurement platform comprises tractor and trailer, for said measurement crossbeam, said synchronously and signal processing apparatus and said data acquisition and treating apparatus the lift-launch platform is provided; Said tractor draws said trailer and advances, and the trailing wheel of said trailer is an active wheel;
Said measurement crossbeam is positioned on the said trailer, is installed in the top, wheel crack of said active wheel, mainly is made up of the laser beam directive road surface of said laser doppler vibrometer crossbeam skeleton, laser doppler vibrometer and fibre optic gyroscope;
Said laser doppler vibrometer, its number are 4-7, are arranged on the said crossbeam skeleton; One of them said laser doppler vibrometer is a reference laser Doppler vialog, and the distance between the said active wheel center is greater than the radius of deflection basin; Other 3-6 said laser doppler vibrometer is Laser Measurement Doppler vialog, and the distance between the said active wheel center is less than the radius of deflection basin;
Laser center line that said laser doppler vibrometer sends and the angle θ between the vertical direction are that 1.5 degree are to 2.5 degree;
The number of said fibre optic gyroscope is 3; 3 fibre optic gyroscopes become orthogonal space to arrange; Said fibre optic gyroscope is arranged on the said crossbeam skeleton; Fibre optic gyroscope is measured three axis angular rates of said crossbeam skeleton in inertial space, is used to compensate the crossbeam skeleton because angular movement causes the range rate error of laser doppler vibrometer;
The measurement result of said reference laser Doppler vialog, said Laser Measurement Doppler's vialog and said fibre optic gyroscope is transferred in said data acquisition and the treating apparatus;
Said active wheel can guarantee in the process of running, does not block or interferes laser;
Said fifth wheel mainly is made up of wheel, wheel fixed mount and optical rotary encoder, and this wheel is fixed on the said crossbeam skeleton by this wheel fixed mount; This optical rotary encoder is installed on this wheel, is used to measure the instantaneous speed of service of this wheel, and should the instantaneous speed of service be sent in said data acquisition and the treating apparatus;
Said accelerometer is embedded in the road surface, is used to measure said traverse measurement platform through road surface brief acceleration value, and this accekeration is sent in said data acquisition and the treating apparatus;
Said data acquisition and treating apparatus are used for the instantaneous deflection value according to the data computation road surface that receives.
2. dynamic Laser flexure according to claim 1 is measured car, it is characterized in that said Laser Measurement Doppler's vialog is three, and said fibre optic gyroscope is three;
100 ± 10 millimeters in the place ahead at the said active wheel of one said Laser Measurement Doppler's vialog distance center;
300 ± 10 millimeters in the place ahead at the said active wheel of another said Laser Measurement Doppler's vialog distance center;
750 ± 10 millimeters in the place ahead at the said active wheel of another said Laser Measurement Doppler's vialog distance center;
3600 ± 100 millimeters in the place ahead at the said active wheel of said reference laser Doppler vialog distance center;
Said three fibre optic gyroscopes, the mode of being orthogonal is fixed on the middle part of said crossbeam skeleton.
3. dynamic Laser flexure according to claim 1 and 2 is measured car, it is characterized in that, it also comprises synchronously and signal processing apparatus, said synchronously and signal processing apparatus comprise vehicle location and synchronization control circuit and sensor signal processing circuit;
Said vehicle location and synchronization control circuit receive the signal of gps signal and the transmission of said optical rotary encoder, after treatment, and Time Created and linear space benchmark, and generate the sensor synchronous control signal;
Said sensor signal processing circuit; The voltage signal that is used for standard that the signal of said laser doppler vibrometer, said fibre optic gyroscope, said optical rotary encoder and the output of said accelerometer is changed into, and this voltage signal is sent in said data acquisition and the treating apparatus.
4. dynamic Laser flexure according to claim 3 is measured car, it is characterized in that it also comprises shelter and environment holdout device, wherein,
Said shelter comprises steel frame, aluminium extruded sections cover plate and insulated fire expanded material, is arranged on the said trailer and covers at said measurement crossbeam top;
Said environment holdout device is arranged at said shelter inside, comprises that on-board air conditioner, warm-air drier and compressor constitute, and is the working environment of 25 ± 2 ℃ of said shelter inner sustain, and the air pressure of keeping in the said shelter is out of my cabin 1.1-1.2 times.
5. dynamic Laser flexure according to claim 4 is measured car, it is characterized in that it also comprises balancing weight, and the weight size of said balancing weight can guarantee that said active wheel ground pressure is 100KN, and said balancing weight is removably installed on the said active wheel.
CN2010105617207A 2010-11-18 2010-11-18 Laser dynamic deflection survey vehicle CN102162217B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010105617207A CN102162217B (en) 2010-11-18 2010-11-18 Laser dynamic deflection survey vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010105617207A CN102162217B (en) 2010-11-18 2010-11-18 Laser dynamic deflection survey vehicle

Publications (2)

Publication Number Publication Date
CN102162217A CN102162217A (en) 2011-08-24
CN102162217B true CN102162217B (en) 2012-06-06

Family

ID=44463648

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010105617207A CN102162217B (en) 2010-11-18 2010-11-18 Laser dynamic deflection survey vehicle

Country Status (1)

Country Link
CN (1) CN102162217B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014011291A1 (en) * 2012-07-10 2014-01-16 Raytheon Company Doppler tracking in presence of vehicle velocity uncertainty

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102444079B (en) * 2011-09-16 2014-03-19 武汉武大卓越科技有限责任公司 Pavement deflection measuring system and measuring method
CN102337721A (en) * 2011-09-16 2012-02-01 武汉武大卓越科技有限责任公司 Pavement deflection measurement device and measurement method thereof
CN102535317A (en) * 2012-01-06 2012-07-04 北京市路兴公路新技术有限公司 Rapid testing device for pavement deflection
CN102538742B (en) * 2012-01-09 2015-05-20 中国矿业大学 Deformation measurement and early warning system and method integrating satellite positioning and accelerometer
CN103452032B (en) * 2013-09-26 2015-06-24 武汉武大卓越科技有限责任公司 Dynamic deflection obtaining method based on angles
CN103643620B (en) * 2013-12-18 2016-08-24 北京市路兴公路新技术有限公司 A kind of laser beam depth of parallelism regulation system and method measured for pavement deflection
CN104929023B (en) * 2015-06-08 2017-08-08 北京市路兴公路新技术有限公司 A kind of quick determination method of pavement deflection
CN105891332B (en) * 2016-05-31 2019-08-09 广东交通职业技术学院 A kind of vehicle loaded densification degree detector and its method of multisensor
CN106429308B (en) * 2016-08-27 2019-04-30 无锡天奇信息技术有限公司 The automatic synchronization control system and method that automobile is transferred between two batten chains
CN106289823B (en) * 2016-10-11 2019-02-15 南京拓控信息科技股份有限公司 A kind of locomotive serpentine locomotion detection system and its detection method
CN107217577B (en) * 2017-07-10 2019-07-16 长安大学 The continuous automatic backman beam mechanism of vehicular
CN107345786A (en) * 2017-08-29 2017-11-14 华南理工大学 A kind of device and method for measuring flexible beam transverse vibrational displacement and strain stress relation
CN109695195A (en) * 2018-12-14 2019-04-30 江苏中路工程技术研究院有限公司 A kind of pavement structure internal state detection method
CN109724884B (en) * 2019-01-15 2020-11-03 武汉武大卓越科技有限责任公司 Cross beam for measuring material surface deformation speed under dynamic load action
CN109895808B (en) * 2019-02-26 2020-08-04 武汉武大卓越科技有限责任公司 Track gap detection method and speed measurement system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0819196A2 (en) * 1995-04-03 1998-01-21 Greenwood Engineering APS Method and apparatus for non-contact measuring of the deflection of roads or rails
US5753808A (en) * 1995-09-11 1998-05-19 Quest Integrated, Inc. Self-compensating rolling weight deflectometer
CN2837823Y (en) * 2005-09-01 2006-11-15 彭京武 Hand-held falling weight deflectometer with positioning device
CN2863870Y (en) * 2006-02-22 2007-01-31 呼六福 Double guide pillar laser automatic bending instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0819196A2 (en) * 1995-04-03 1998-01-21 Greenwood Engineering APS Method and apparatus for non-contact measuring of the deflection of roads or rails
US5753808A (en) * 1995-09-11 1998-05-19 Quest Integrated, Inc. Self-compensating rolling weight deflectometer
CN2837823Y (en) * 2005-09-01 2006-11-15 彭京武 Hand-held falling weight deflectometer with positioning device
CN2863870Y (en) * 2006-02-22 2007-01-31 呼六福 Double guide pillar laser automatic bending instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014011291A1 (en) * 2012-07-10 2014-01-16 Raytheon Company Doppler tracking in presence of vehicle velocity uncertainty

Also Published As

Publication number Publication date
CN102162217A (en) 2011-08-24

Similar Documents

Publication Publication Date Title
Lai et al. Vibration response characteristics of the cross tunnel structure
Psimoulis et al. Measuring deflections of a short-span railway bridge using a robotic total station
CN104164829B (en) Detection method of road-surface evenness and intelligent information of road surface real-time monitoring system based on mobile terminal
Green et al. Dynamic response of highway bridges to heavy vehicle loads: theory and experimental validation
US8180590B2 (en) Railroad surveying and monitoring system
US5065618A (en) Method and apparatus for determining terrain surface profiles
CN103343498B (en) Track irregularity detecting system and method based on INS/GNSS
Islam et al. Measurement of pavement roughness using android-based smartphone application
JP4220929B2 (en) Road surface flatness measuring device
CN102251451B (en) Track geometric state measurement system and method based on multisource information fusion technology
CN104316108B (en) Method for establishing and analyzing online monitoring system for 500kv power transmission tower in mountain environment
Lak et al. The effect of road unevenness on the dynamic vehicle response and ground-borne vibrations due to road traffic
CN106458235A (en) Method and apparatus to determine structural parameters of a railway track
CN102967263B (en) A kind of deflection of bridge span-corner integral measurement method
Yi et al. Recent research and applications of GPS based technology for bridge health monitoring
CN204269495U (en) A kind of ground surface material accelerates abrasion laboratory testing rig
CA2574051C (en) Apparatus for detecting hunting and angle of attack of a rail vehicle wheelset
CN102434209B (en) Monitoring method for influence on adjacent existing structures from tunnel excavation
CN201865016U (en) Intelligent track detector for efficient measurement of track parameters
CN107554553B (en) Track geometry irregularities detection method based on two-dimensional laser displacement sensor
CN101694084B (en) Ground on-vehicle mobile detecting system
Haigermoser et al. Road and track irregularities: measurement, assessment and simulation
Richardson et al. On the use of bridge weigh-in-motion for overweight truck enforcement
CN101922133B (en) Intelligent track detector for high-efficiency measurement of track parameters
CN103088849B (en) A kind of servicing bridges foundation pile stress wave echo lossless detection method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CP01 Change in the name or title of a patent holder

Address after: 430223 No.6, 4th Road, Wuda Science Park, Donghu high tech Zone, Wuhan City, Hubei Province

Patentee after: Wuhan Optical Valley excellence Technology Co.,Ltd.

Address before: 430223 No.6, 4th Road, Wuda Science Park, Donghu high tech Zone, Wuhan City, Hubei Province

Patentee before: Wuhan Wuda excellence Technology Co.,Ltd.

CP03 "change of name, title or address"

Address after: 430223 No.6, 4th Road, Wuda Science Park, Donghu high tech Zone, Wuhan City, Hubei Province

Patentee after: Wuhan Wuda excellence Technology Co.,Ltd.

Address before: 430223 No.6, 4th Road, Wuda Science Park, Donghu Development Zone, Wuhan City, Hubei Province

Patentee before: WUHAN WUDA ZOYON SCIENCE AND TECHNOLOGY Co.,Ltd.