CN103925978B - Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric - Google Patents
Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric Download PDFInfo
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- CN103925978B CN103925978B CN201410186325.3A CN201410186325A CN103925978B CN 103925978 B CN103925978 B CN 103925978B CN 201410186325 A CN201410186325 A CN 201410186325A CN 103925978 B CN103925978 B CN 103925978B
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Abstract
Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric, belong to field of road traffic, the present invention detects Problems existing for solving existing vehicle load-bearing.The present invention includes die plummer, stable state composite plate, multiple PZT ceramic sheet and control module; Described control module comprises rectification circuit, single-chip microcomputer, display, information input unit and database; Die plummer is made up of arc and base plate, arranges the stable state composite plate of fitting with the radian of arc, leave deformation space at hollow space; On the surface of stable state composite plate, multiple PZT ceramic sheet is set; Tire pressure signal before and after multiple PZT ceramic sheet collection vehicle, is connected with the input end of single-chip microcomputer through rectification circuit; And shown by display; The output terminal of information input unit is connected with the information input terminal of single-chip microcomputer; The data transmission terminal of single-chip microcomputer is connected with the data transmission terminal of database.
Description
Technical field
The present invention relates to the portable dynamic overload of vehicle detecting device based on piezoelectric and overload detecting method, belong to field of road traffic.
Background technology
Traffic hazard is the key factor affecting Modern road traffic system effectiveness, is also the great restriction and the matter of utmost importance that affect intelligent transportation development.Along with development that is economic and society, the sustainable growth of vehicles number, makes road traffic system load constantly increase, and the probability that traffic hazard simultaneously occurs also constantly promotes.According to statistics, the traffic safety accident in the whole nation 70% is that vehicle overload causes, the severely injured traffic accident of the dead group of group of 50% and overweightly have direct relation, and vehicle overload is transported to people's lives and properties and brings about great losses.Simultaneously the load of dead weight cargo haulage vehicle is considerably beyond the design bearing load of highway or bridge, cause pavement damage, bridge breaking, to such an extent as to normal tenure of use shortens greatly, medium-capital overhauling in advance of having to, even has a strong impact on the use of traffic infrastructure.Every year because vehicle overload travels the loss that causes more than 30,000,000,000 yuan in the highway bridge of the whole nation, this causes huge loss to national wealth beyond doubt.So can detect effectively easily and control overload of vehicle traveling is vital for traffic safety.
Domestic and international existing vehicle load-bearing detection method and instrument mainly contain following several: electronic car claims (i.e. electronic loadometer), single-chip microcomputer automatic weighing system, SCM Based fiber grating check weighing system etc.
Electronic vehicle weighing apparatus (electronic loadometer) has problems: 1) electronic loadometer volume is comparatively large, and during measurement, inconvenience is mobile, makes to measure place restricted; 2) manufacture instrument cost higher, be not suitable for widely using; 3) instrument is done manual work accurate, needs the personnel of specialty to carry out debugging maintenance, and needs long-term observation, carry out necessary daily servicing and maintenance, otherwise will affect accuracy and the stability of instrument to instrument.4) have higher requirement to environment for use, can it be related to sensor and normally work and its safety and serviceable life, and even the reliability of whole weighing apparatus and security.Generally, hot environment causes the problems such as coating material melts, solder joint becomes civilized, the change of elastic body internal stress recurring structure to sensor; Under corresponding environmental factor, we must select corresponding sensor could meet necessary requirement of weighing.Single-chip microcomputer automatic weighing system has problems: when 1) measuring, vehicle inconvenience is mobile; 2) product durability is poor, is unsuitable for Long-Time Service; Portable wireless overload detector existing problems: instrument involves great expense, apparatus structure is complicated, maintenance cost is higher, the maintenance technique needed is higher. and for the fiber grating check weighing system in important bridge and the load-bearing of road pre-test vehicle, its sensitivity and accuracy are very high, but instrument involves great expense, can only external inlet device, and apparatus structure complexity must have professional person to operate, timed maintenance overhauls, and maintenance cost is higher.
Current shortage popularize a kind of cost lower, lightly nimble, can carry can the vehicle dynamic bearing detection of random Checkpointing.
Summary of the invention
The present invention seeks to detect Problems existing to solve existing vehicle load-bearing, providing a kind of portable dynamic overload of vehicle detecting device based on piezoelectric and overload detecting method.
Portable dynamic overload of vehicle detecting device based on piezoelectric of the present invention, it comprises die plummer, stable state composite plate, multiple PZT ceramic sheet and control module;
Described control module comprises rectification circuit, single-chip microcomputer, display, information input unit and database;
Die plummer is made up of arc and base plate, arc and base plate are integrated part, the hollow space surrounded at arc and base plate arranges stable state composite plate, the radian of stable state composite plate and the radian of arc are fitted, the arc peak of stable state composite plate and the arc peak of arc tangent, leave deformation space between stable state composite plate and arc; Multiple PZT ceramic sheet is evenly provided with in the upper and lower surface of stable state composite plate;
Tire pressure signal before and after multiple PZT ceramic sheet collection vehicle, and export to rectification circuit, the output terminal of rectification circuit is connected with the input end of single-chip microcomputer; The display output terminal of single-chip microcomputer is connected with the display input end of display;
The output terminal of information input unit is connected with the information input terminal of single-chip microcomputer;
The data transmission terminal of single-chip microcomputer is connected with the data transmission terminal of database.
Based on the overload detecting method of the described portable dynamic overload of vehicle detecting device based on piezoelectric, the method comprises the following steps:
Step one, input place bridge or road weight higher limit GT1 by information input unit to single-chip microcomputer;
The front-wheel of step 2, vehicle and trailing wheel press through the curved upper surface of die plummer successively, and PZT ceramic sheet excitation voltage pulse signal, exports to single-chip microcomputer after rectifier circuit rectifies, obtains automobile front-axle magnitude of voltage U
1with rear axle magnitude of voltage U
2;
Step 3, the forward and backward axle weight of acquisition vehicle;
According to formula
obtain automobile front-axle weight a
1;
According to formula
obtain automobile front-axle weight a
2;
Step 4, input the concrete model of vehicle by information input unit to single-chip microcomputer, single-chip microcomputer transfers the heavy a of standard front axle of this vehicle models according to this model from database
1T, the heavy a of standard rear axle
2Twith carrying higher limit G
t2;
Step 5, according to formula
obtain gross combination weight;
Wherein: m
1for according to automobile front-axle weight a
1the gross combination weight calculated;
M
2for according to vehicle rear axle weight a
2the gross combination weight calculated;
γ is correction factor, gets 0.;
Step 6, judge whether to meet relational expression: m>=G
t1;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then perform step 7;
Step 7, judge whether to meet relational expression: m>=G
t2;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then testing result is vehicle non-overloading.
Advantage of the present invention: the present invention designs the overweight detecting device of a kind of portable vehicle based on PZT material.Detection preliminary examination that this equipment is applicable to highway, bridge is overweight.Itself and stable state composite plate, based on the output response of PZT-4 type piezoelectric ceramics and direct piezo electric effect, bond and form intellectual material, be placed in plummer by equipment, whether overweight it is in preliminary judgement, as overweight in tentatively judged, then transfer law enfrocement official and process further, simplify overweight trace routine.
Easy to operate, light removable, any place can be used as detection site and preliminary examination, product changes the shortcoming of heavy, the inconvenient movement of vehicle weighing instrument in the past, for highway, bridge is overweight plays the effect of a preliminary examination, effectively can reduce the working strength of measuring station staff.Meanwhile, the operating process of simplification detection vehicle overload that can be practical, is conducive to improving the problems such as measuring station periphery traffic jam is serious, reduces the probability that the traffic hazard of measuring station periphery occurs.
Accompanying drawing explanation
Fig. 1 is the structural representation of the portable dynamic overload of vehicle detecting device based on piezoelectric of the present invention;
Fig. 2 is the deployed configuration schematic diagram of stable state composite bench;
Fig. 3 is the theory diagram of the portable dynamic overload of vehicle detecting device based on piezoelectric of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, based on the portable dynamic overload of vehicle detecting device of piezoelectric described in present embodiment, it comprises die plummer 1, stable state composite plate 2, multiple PZT ceramic sheet 3 and control module;
Described control module comprises rectification circuit 4, single-chip microcomputer 5, display 6, information input unit 7 and database 8;
Die plummer 1 is made up of arc and base plate, arc and base plate are integrated part, the hollow space surrounded at arc and base plate arranges stable state composite plate 2, the radian of stable state composite plate 2 and the radian of arc are fitted, the arc peak of stable state composite plate 2 and the arc peak of arc tangent, leave deformation space between stable state composite plate 2 and arc; Multiple PZT ceramic sheet 3 is evenly provided with in the upper and lower surface of stable state composite plate 2;
Tire pressure signal before and after multiple PZT ceramic sheet 3 collection vehicle, and export to rectification circuit 4, the output terminal of rectification circuit 4 is connected with the input end of single-chip microcomputer 5; The display output terminal of single-chip microcomputer 5 is connected with the display input end of display 6;
The output terminal of information input unit 7 is connected with the information input terminal of single-chip microcomputer 5;
The data transmission terminal of single-chip microcomputer 5 is connected with the data transmission terminal of database 8.
Information input unit 7 adopts keyboard to realize.
Die plummer 1 integral material is all steel.Its placed inside PZT ceramic sheet 3 and stable state composite plate 2, directly rolling of vehicle tyre will be born in outside.Die plummer 1 is by the direct axletree pressure generation deformation be subject to and pass to stable state composite plate 2, and stable state composite plate 2 deformation passes to PZT ceramic sheet 3.Stable state plate deformation that intensity is large so die plummer 1 has, deformation coincide, the feature that durability degree is good, its objective is the measurement range of enlarged internal stable state composite plate 2, can be applicable to the detection of vehicle mass magnitude.
Inner at die plummer 1, the both sides of stable state composite plate 2 respectively reserve the deformation space of 2mm.Vehicle tyre will pass through along curved surfaces, the interlude on die plummer 1 surface is the thinnest position (2mm), pass out a maximum pressure and cause stable state composite plate 2 to be out of shape until vehicle tyre arrives arc peak (i.e. the thinnest point) Shi Caihui thus make PZT ceramic sheet 3 gather deformation, stable state composite plate 2 can not be caused at interlude two ends to occur the peak value of the potential pulse that namely deformation on a large scale there will not be PZT ceramic sheet 3 to export.
Stable state composite plate 2, in arch, has the novel intelligent memory metal hybrid laminate of certain curvature (curvature-adjustable, respective strengths is adjustable, and thickness is adjustable).Stable state composite plate 2 central core is thin layer aluminium flake, and fluctuate interlayer is that carbon fiber prepreg Material cladding forms.It has multiple stable state, namely can stably remain on multiple physical state, can remember change when external force applies between various stable state.
Adopt this plate to bond PZT ceramic sheet 3, be because this plate can be good at making up the drawback of PZT ceramic sheet 3 material, be mainly reflected in the following aspects:
1, the PZT-4 stupalith sheet very thin (0.1mm) that present embodiment adopts, PZT is a kind of pottery simultaneously, the ultimate strain amount that itself characteristic determines it is little, maximumly be no more than 700uE, therefore it is very crisp frangible, need one piece of stabilization and be out of shape continuous print loading plate transmit the distortion of PZT material and be unlikely to PZT thin slice to be torn, this composite plate can in high-frequency ground steady-state deformation, still stable after reset condition, and smooth surface distortion continuously, bur can not be there is, outstanding deformation, discontinuous deformation causes PZT material disengaging plate surface even to be torn, broken.
2, this plate has less coefficient of thermal expansion and contraction, because PZT material very sensitive, the obvious loading plate that expands with heat and contract with cold greatly will affect the deformable piezoelectric work of the PZT ceramic sheet 3 of bonding.
3, be easily subject to the interference of moisture when PZT ceramic sheet 3 works, and the carbon fiber prepreg on this plate surface there is very strong adsorbability, can obvious moisture in absorbed air, keep the neighbouring drying of PZT active gage.
4, this plate has remarkable strength character, toughness performance, fatigue behaviour, there is the problem of Fatigue Deformation hardly, the stability of its brilliance ensure that the initial position of each deformation of piezoelectric is identical thus ensure the voltage difference between each time truly derive from pressurized size.
The dimensions being bonded with the stable state composite plate 2 of PZT ceramic sheet 3 is as follows:
PZT ceramic sheet 3 is fitted and is required:
Stable state composite plate 2 has certain radian, still by open and flat for stable state composite plate 2 (arc length and length, wide constant).
In figure, PZT ceramic sheet 3 is the square fritter of size 14mm*14mm, every two pieces of ceramic sheet 3 interval 3mm, and ceramic sheet distance stable state composite plate about 2 end of high order end and low order end is 43.9mm.PZT ceramic sheet 3 is 18.5mm apart from stable state composite plate about 2 two ends.On each block PZT ceramic sheet 3, laminating one is thin is simultaneously the copper sheet that 0.1mm size is identical with ceramic sheet, and copper cash reaches by connecting copper sheet the object connecting each PZT ceramic sheet.
In stable state composite plate 2 positive and negative each bonded 7 amount to 14 PZT ceramic sheets, 3,14 PZT ceramic sheets 3 as power supply, link 14 PZT as parallel connection power supply in order to add large deformation electric pulse voltage capacitor with fine copper wire.Bond 3 electricity knots in stable state composite plate 2 one end as output node, and 3 electricity knots link rectifying part simultaneously.Rectification circuit 4 is made up of 2 DB107S rectifier bridges, by after rectifier bridge process pulse signal, interchange is converted into direct current signal, has both positive and negative polarity as circuit outlet terminal simultaneously.
In single-chip microcomputer 5, also can be sent to PC by single-chip microcomputer 5 by serial port circuit and hold reprocessing and judgement the process of data and the judgement that whether overloads.
Embodiment two: based on described in embodiment one based on the overload detecting method of the portable dynamic overload of vehicle detecting device of piezoelectric, the method comprises the following steps:
Step one, input place bridge or road weight higher limit G by information input unit 7 to single-chip microcomputer 5
t1;
The front-wheel of step 2, vehicle and trailing wheel press through the curved upper surface of die plummer 1 successively, and PZT ceramic sheet 3 excitation voltage pulse signal, exports to single-chip microcomputer 5 after rectification circuit 4 rectification, obtains automobile front-axle magnitude of voltage U
1with rear axle magnitude of voltage U
2;
Step 3, the forward and backward axle weight of acquisition vehicle;
According to formula
obtain automobile front-axle weight a
1;
According to formula
obtain automobile front-axle weight a
2;
Step 4, inputted the concrete model of vehicle to single-chip microcomputer 5 by information input unit 7, single-chip microcomputer 5 transfers the heavy a of standard front axle of this vehicle models according to this model from database 8
1T, the heavy a of standard rear axle
2Twith carrying higher limit G
t2;
Step 5, according to formula
obtain gross combination weight;
Wherein: m
1for according to automobile front-axle weight a
1the gross combination weight calculated;
M
2for according to vehicle rear axle weight a
2the gross combination weight calculated;
γ is correction factor, gets 0.93;
Step 6, judge whether to meet relational expression: m>=G
t1;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then perform step 7;
Step 7, judge whether to meet relational expression: m>=G
t2;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then testing result is vehicle non-overloading.
Claims (2)
1. based on the overload detecting method of the portable dynamic overload of vehicle detecting device of piezoelectric, the method realizes based on the portable dynamic overload of vehicle detecting device of piezoelectric, and the portable dynamic overload of vehicle detecting device of described piezoelectric comprises die plummer (1), stable state composite plate (2), multiple PZT ceramic sheet (3) and control module;
Described control module comprises rectification circuit (4), single-chip microcomputer (5), display (6), information input unit (7) and database (8);
Die plummer (1) is made up of arc and base plate, arc and base plate are integrated part, the hollow space surrounded at arc and base plate arranges stable state composite plate (2), the radian of stable state composite plate (2) and the radian of arc are fitted, the arc peak of stable state composite plate (2) and the arc peak of arc tangent, leave deformation space between stable state composite plate (2) and arc; Multiple PZT ceramic sheet (3) is evenly provided with in the upper and lower surface of stable state composite plate (2);
Tire pressure signal before and after multiple PZT ceramic sheet (3) collection vehicle, and export to rectification circuit (4), the output terminal of rectification circuit (4) is connected with the input end of single-chip microcomputer (5); The display output terminal of single-chip microcomputer (5) is connected with the display input end of display (6);
The output terminal of information input unit (7) is connected with the information input terminal of single-chip microcomputer (5);
The data transmission terminal of single-chip microcomputer (5) is connected with the data transmission terminal of database (8);
It is characterized in that, the method comprises the following steps:
Step one, input place bridge or road weight higher limit G by information input unit (7) to single-chip microcomputer (5)
t1;
The front-wheel of step 2, vehicle and trailing wheel press through the curved upper surface of die plummer (1) successively, PZT ceramic sheet (3) excitation voltage pulse signal, after rectification circuit (4) rectification, export to single-chip microcomputer (5), obtain automobile front-axle magnitude of voltage U
1with rear axle magnitude of voltage U
2;
Step 3, the forward and backward axle weight of acquisition vehicle;
According to formula
obtain automobile front-axle weight a
1;
According to formula
obtain automobile front-axle weight a
2;
Step 4, input the concrete model of vehicle by information input unit (7) to single-chip microcomputer (5), single-chip microcomputer (5) transfers the heavy a of standard front axle of this vehicle models according to this model from database (8)
1T, the heavy a of standard rear axle
2Twith carrying higher limit G
t2;
Step 5, according to formula
obtain gross combination weight;
Wherein: m
1for according to automobile front-axle weight a
1the gross combination weight calculated;
M
2for according to vehicle rear axle weight a
2the gross combination weight calculated;
γ is correction factor, gets 0.93;
Step 6, judge whether to meet relational expression: m>=G
t1;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then perform step 7;
Step 7, judge whether to meet relational expression: m>=G
t2;
If the determination result is YES, then testing result is overload of vehicle; If judged result is no, then testing result is vehicle non-overloading.
2. the overload detecting method of the portable dynamic overload of vehicle detecting device based on piezoelectric according to claim 1, information input unit (7) adopts keyboard to realize.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410186325.3A CN103925978B (en) | 2014-05-05 | 2014-05-05 | Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric |
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| CN201410186325.3A CN103925978B (en) | 2014-05-05 | 2014-05-05 | Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric |
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| Publication Number | Publication Date |
|---|---|
| CN103925978A CN103925978A (en) | 2014-07-16 |
| CN103925978B true CN103925978B (en) | 2016-02-17 |
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|---|---|---|---|
| CN201410186325.3A Expired - Fee Related CN103925978B (en) | 2014-05-05 | 2014-05-05 | Based on portable dynamic overload of vehicle detecting device and the overload detecting method of piezoelectric |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136354A (en) * | 2015-08-18 | 2015-12-09 | 吉林大学 | Highway pavement load spectrum piezoelectric arc detection apparatus |
| CN105651368A (en) * | 2015-12-29 | 2016-06-08 | 韦金城 | Quick and nondestructive testing method for road axle load spectrum |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4793429A (en) * | 1988-04-20 | 1988-12-27 | Westinghouse Electric Corp. | Dynamic vehicle-weighing system |
| CN101625254B (en) * | 2009-07-20 | 2013-12-18 | 江西省交通运输技术创新中心 | Piezoelectric type dynamic strip-shaped weighing plate |
| CN202420639U (en) * | 2012-01-18 | 2012-09-05 | 郑州衡量电子科技有限公司 | Piezoelectric sensor for dynamic weight measurement of vehicle |
| CN102706420A (en) * | 2012-06-21 | 2012-10-03 | 厦门大学 | Device and method for dynamically detecting vehicle loading capacity and vehicle speed in real time |
| CN202928671U (en) * | 2012-07-11 | 2013-05-08 | 绵阳市奇石缘科技有限公司 | I-beam vehicle dynamic weighing sensor |
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2014
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