CN100367324C - Dynamic Weight and Speed Monitoring Device for Highway - Google Patents
Dynamic Weight and Speed Monitoring Device for Highway Download PDFInfo
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- CN100367324C CN100367324C CNB2005100105076A CN200510010507A CN100367324C CN 100367324 C CN100367324 C CN 100367324C CN B2005100105076 A CNB2005100105076 A CN B2005100105076A CN 200510010507 A CN200510010507 A CN 200510010507A CN 100367324 C CN100367324 C CN 100367324C
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Abstract
本发明提供的是一种高速路的动态重量和速度监测装置。它由传感器、称重承载装置、解调装置、数据采集装置和数据处理装置组成；称重承载装置设置于路面上，它由承载板、缓冲层、支架和基础组成，两个支架固定在基础上，承载板的两端固定在支架上，缓冲层位于承载板与基础之间；传感器为光纤布拉格光栅，至少有三只光纤布拉格光栅传感器布设于称重承载装置的承载板下表面第一和第二层之间的对称位置，光纤布拉格光栅传感器的引出光纤与解调装置相连；数据采集装置与解调装置相连；数据采集装置与数据处理装置相连。系统与路面完好结合，不影响汽车的行驶，汽车经过监测系统时，不需要减速、指定位置等限制的要求即可测得汽车的重量和速度等参数。
The invention provides a dynamic weight and speed monitoring device for an expressway. It consists of sensors, weighing and carrying devices, demodulation devices, data acquisition devices and data processing devices; The two ends of the bearing plate are fixed on the bracket, and the buffer layer is located between the bearing plate and the foundation; the sensor is a fiber Bragg grating, and at least three fiber Bragg grating sensors are arranged on the first and second lower surfaces of the bearing plate of the weighing load bearing device. In the symmetrical position between the two floors, the outgoing optical fiber of the fiber Bragg grating sensor is connected to the demodulation device; the data acquisition device is connected to the demodulation device; and the data acquisition device is connected to the data processing device. The system is well integrated with the road surface and does not affect the driving of the car. When the car passes by the monitoring system, parameters such as the weight and speed of the car can be measured without restrictions such as deceleration and designated location.
Description
(I) the technical field
The present invention relates to a monitoring device, and more particularly to a device for dynamically monitoring the weight, speed, etc. of a vehicle traveling on a highway.
(II) background Art
Dynamic weighing is of great importance in road traffic. On a highway, when a truck, particularly a heavy-duty truck passes through a toll station, corresponding cost needs to be charged according to the load, a traditional weighing system generally adopts a metal strain gauge as a sensor, the response speed is slow, the truck needs to decelerate when approaching the weighing system and passes through a specified position, so that certain damage can be undoubtedly generated on a road surface, and the road surface near the weighing system is obviously abraded compared with other sections along with the accumulation of time; and another key defect is that the sensors such as strain gauges and the like are active devices, the working environment of the weighing structure is abnormally severe due to the environment of a road surface, and the weighing structure is usually completely immersed in water, although some manufacturers claim that the products meet the IP67 standard (working in a humid environment) and even the IP68 standard (working in a humid environment), system failure is possible to occur at any time, and once the system failure occurs, huge economic loss is caused.
(III) summary of the invention
The invention aims to provide a dynamic weight and speed monitoring device for an expressway, which can monitor in a normal running state of a vehicle, has high reliability and good stability and can accurately measure.
The purpose of the invention is realized by the following steps: the device consists of a sensor, a weighing bearing device, a demodulating device, a data acquisition device and a data processing device; the weighing bearing device is arranged on a road surface and comprises a bearing plate, a buffer layer, supports and a foundation, wherein the two supports are fixed on the foundation, two ends of the bearing plate are fixed on the supports, and the buffer layer is positioned between the bearing plate and the foundation; the sensors are fiber Bragg gratings, at least three fiber Bragg grating sensors are arranged at the symmetrical positions between the first layer and the second layer of the lower surface of the bearing plate of the weighing bearing device, and the leading-out optical fibers of the fiber Bragg grating sensors are connected with the demodulating device; the data acquisition device is connected with the demodulation device; the data acquisition device is connected with the data processing device.
The invention may also include such features:
1. the bearing plate is made of T-300 carbon fiber reinforced composite materials.
2. The buffer layer is made of flexible rubber, the upper surface of the buffer layer is connected with the lower surface of the bearing plate in an adhesive mode, and the lower surface of the buffer layer is tightly combined with the foundation.
3. The support is made of high-strength aluminum alloy material 7075, the support and the two sides of the long end of the bearing plate are simply supported, and the connecting part is connected by a bolt and a screw.
The numerous advantages of the present invention overcome the deficiencies of existing systems. Firstly, the fiber Bragg grating is used as a sensor, the propagated signal is an optical signal, the hidden failure danger of an active device in a humid environment is overcome, the sensor is not interfered by external electromagnetic interference, the sensor is completely embedded in the composite material and completely isolated from the outside, the sensor is fully protected, and the excellent water resistance of the composite material ensures that the system can work for a long time in a water-immersed environment. Compared with various traditional sensors, the optical fiber sensor has the advantages of small volume, light weight, high sensitivity, low loss, wide frequency band, electromagnetic interference resistance, corrosion resistance, good electrical insulation, explosion resistance, flexible optical path, convenience for connection with a computer, compact structure and the like, can sense various physical quantities and chemical quantities, is reliable in operation, has the working temperature range of-150-500 ℃, and completely meets the requirements of working in outdoor severe environment.
The system is characterized in that the system is well combined with the road surface, the running of the automobile is not influenced, and when the automobile passes through the monitoring system, parameters such as the weight, the speed and the like of the automobile can be measured without the requirements of speed reduction, designated position and other limitations. Compared with the prior system, the device provided by the invention realizes the measurement of various characteristics including weight, speed and the like by using one sensor, and can realize new functions of vehicle type identification, violation record and the like in a later-developed system.
The measurement principle is as follows: when the automobile passes through the bearing plate, the strain generated on the lower surface of the bearing plate is measured by the fiber grating sensor and recorded by the data acquisition system. Recorded by the data acquisition system is the time history of the change in strain measured by the sensor. Referring to fig. 4, a typical monitoring data is shown. A. The three measurement peak values B and C indicate that three axles drive through the bearing plate, the heights of the peak values are different, the corresponding weights are different, and the widths are different, and the corresponding speeds are different. The distance between the different peaks corresponds to the distance between the two axes, and the slope of the rising portion before the peak starts also corresponds to the vehicle speed. Because the position of the automobile on a certain lane is not fixed in the driving process, and when the positions are different, the data measured by the two sensors on the same weight and speed bearing plate are different, in order to accurately measure the axle weight, the position of the wheel passing through the bearing plate must be judged. The following relation is found by modeling and simulation calculation through a finite element program: 1. in the data obtained by the two sensors, if the two measured values are not equal, the wheel approaches the sensor with the larger measured value, and the difference between the approach distance and the measured values of the two sensors has a good linear relation, and after the characteristic data are calculated and processed by data processing software, the corresponding speed, the vehicle weight, the charge and the like can be obtained.
(IV) description of the drawings
FIG. 1 is a graph showing the repeatability of the strain response of a fiber grating;
FIG. 2 is a schematic diagram of the arrangement of sensors;
FIG. 3 is a schematic view of the structure of the load carrier;
FIG. 4 is a schematic diagram of a measurement signal;
fig. 5 is a schematic view of the arrangement of the present invention.
(V) detailed embodiment formula
The invention is described in more detail below by way of example:
referring to fig. 5, the dynamic weight and speed monitoring device for highway comprises a sensor 1, a weighing and carrying device 2, a demodulating device 3, a data collecting device 4 and a data processing device 5. The weighing and bearing device is arranged on a road surface and is composed of a bearing plate 11, a buffer layer 14, a bracket 13 and a foundation 12 in combination with figure 3. Meanwhile, in combination with fig. 2, the sensors are fiber bragg gratings, and three fiber bragg grating sensors are symmetrically arranged on the bearing plate of the weighing and bearing device. The leading-out optical fiber of the optical fiber Bragg grating sensor is connected with the demodulating device; the data acquisition device is connected with the demodulation device; the data acquisition device is connected with the data processing device.
1) A sensor portion: the sensor uses a fiber bragg grating. A fiber bragg grating is a wavelength selective reflector that reflects a center wavelength with the mathematical expression:
λ B ＝2n eff Λ
its differential form can be expressed as:
where Λ is the period of the grating and n is the effective index of the core. From the above equation, it can be seen that all physical quantities that can cause changes in the effective refractive index of the fiber grating or changes in the grating period can cause changes in the bragg wavelength. When the fiber Bragg grating is stressed by external force to generate strain, the grating period changes, the effective refractive index also changes due to the elasto-optic effect, and the change quantity of the effective refractive index is as follows:
therefore, the method comprises the following steps:
in the formula P 1i (i =1, 2) is the elasto-optic coefficient of the single-mode fiber, upsilon is the Poisson ratio of the fiber material, and epsilon x Is the axial strain produced by the optical fiber, the fiber Bragg grating is a grating with uniform period, so the method comprises the following steps:
therefore, when the fiber grating is strained, the relative change in the total bragg wavelength due to two effects is:
note book
P e Referred to as the effective elastic-optic coefficient of the fiber, P for a silica fiber e 0.22, so there is:
in the formula of x For microstrain, the theoretical strain sensitivity coefficient of the fiber grating can be calculated from the above formula, for example, when the fiber grating λ B And when the wavelength is =1550nm, the strain sensitivity of the fiber grating is as follows:
the fiber grating sensor has good repeatability in strain measurement, and is suitable for a large number of repeated measurements on roads as shown in figure 5.
2) The weighing and bearing device comprises: the weight and speed information of the automobile are transmitted to the sensor through the bearing structure, when the automobile wheel passes through the bearing plate, the bearing plate is deformed due to the axle weight, meanwhile, the fiber grating sensor tightly combined with the bearing plate is deformed, and the axle weight is calculated through the demodulation equipment. The weighing bearing part comprises four parts, namely a bearing plate, a buffer layer, a bracket and a foundation. The material of the bearing plate is made of a T-300 carbon fiber reinforced composite material, and according to a three-step curing process given by a manufacturer, the bearing plate is heated to 90 ℃ at a heating rate of 1.5-2.0 ℃/min at room temperature and is kept at the temperature for 30min; continuously heating to 130 ℃ at the heating rate of 1.5-2.0 ℃/min, and keeping the temperature for 30min; then heating to 175 plus or minus 5 ℃ at the speed of 1.5-2.0 ℃/min, and keeping the temperature for 150min. Three fiber bragg grating sensors are arranged at symmetrical positions between the first layer and the second layer on the lower surface of the bearing plate (as shown in FIG. 2); the upper surface of the buffer layer is made of flexible rubber and is glued with the lower surface of the bearing plate, and the lower surface of the buffer layer is tightly combined with the foundation; the support uses high strength aluminum alloy material 7075, simply props up in loading board long end both sides, and the junction uses the bolt and screw rod to connect. The foundation part is firstly used for removing asphalt or cement on the surface of the road, cement is used for leveling and foundation bolts are buried in the shallow pits, and the support is connected with the foundation bolts after the cement is solidified.
3) A demodulation device: since the vehicle does not stop during the measurement, there is a high demand for the response frequency of the demodulation device. The frequency of the high-speed demodulation device developed by the research can reach 13kHz, and the precision is 0.2 mu epsilon. The demodulation principle is that light emitted by a 1550nm light-emitting tube passes through a first light splitter and reaches a measurement grating, light with strain information passes through a second light splitter, one path of light is converted into an electric signal through chirp grating linearization, the other path of reference light is directly converted into an electric signal, and the two paths of electric signals are divided to obtain the central wavelength of the grating.
4) Data acquisition device and processing apparatus: the analog signal obtained by the demodulation system is digitized, and the data is recorded at high speed, analyzed and calculated to obtain the information of the weight, the speed and the like of the automobile. The data acquisition device uses a Huahua PCI bus data acquisition and control card PCI-1716, and the acquisition card has 16-bit high resolution, 16-channel analog input, 1K FIFO,250KS/s sampling rate, PCI bus data transmission, automatic calibration function and the like. The data processing device is provided with processing software, so that the items such as vehicle speed, vehicle weight, charging and the like can be displayed intuitively.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100105076A CN100367324C (en) | 2005-11-04 | 2005-11-04 | Dynamic Weight and Speed Monitoring Device for Highway |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100105076A CN100367324C (en) | 2005-11-04 | 2005-11-04 | Dynamic Weight and Speed Monitoring Device for Highway |
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| CN1776766A CN1776766A (en) | 2006-05-24 |
| CN100367324C true CN100367324C (en) | 2008-02-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460256C (en) * | 2006-11-22 | 2009-02-11 | 北京东方瑞威科技发展有限公司 | Optical fibre unbalance loading apparatus |
| CN102521988B (en) * | 2011-12-02 | 2014-04-23 | 哈尔滨工业大学 | Vehicle Speed and Position Fiber Grating Measuring System |
| CN102628708B (en) * | 2012-04-11 | 2014-01-08 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vehicle load dynamic weighing method for orthotropic bridge deck steel box girder bridge |
| CN104390685A (en) * | 2014-11-18 | 2015-03-04 | 苏州佳因特光电科技有限公司 | Portable optical fiber dynamic weighing system |
| CN106323433A (en) * | 2015-07-03 | 2017-01-11 | 北京东方瑞威科技发展股份有限公司 | Optical fiber plate sensor and railway overload and unbalanced-load system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930002977B1 (en) * | 1990-03-21 | 1993-04-16 | 이호준 | Vehicle Information Discrimination Device Using Optical Fiber Sensor |
| CN2237234Y (en) * | 1994-12-06 | 1996-10-09 | 叶庆昭 | Full electronic shaft dynamic weighing platform |
| US5798983A (en) * | 1997-05-22 | 1998-08-25 | Kuhn; John Patrick | Acoustic sensor system for vehicle detection and multi-lane highway monitoring |
| CN2391180Y (en) * | 1999-10-27 | 2000-08-09 | 郭纪隆 | Removable electronic vehicle weighing apparatus |
| CN2395259Y (en) * | 1999-10-08 | 2000-09-06 | 陈志强 | Dynamic electronic automobile scale |
| CN1414350A (en) * | 2002-11-27 | 2003-04-30 | 南开大学 | Optical fibre grating torsion sensing device capable of sensing torsion and temperature at the same time |
| KR100462749B1 (en) * | 2002-05-09 | 2004-12-20 | 고속도로정보통신(주) | Apparatus for measuring weight of car using optical fiber sensor |
| CN2667473Y (en) * | 2004-01-06 | 2004-12-29 | 李叙有 | Butterfly electronic vehicle weighing apparatus bearing platform |
| JP2005024427A (en) * | 2003-07-03 | 2005-01-27 | Hitachi Cable Ltd | Optical fiber sensor for vehicle weight detection |
-
2005
- 2005-11-04 CN CNB2005100105076A patent/CN100367324C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930002977B1 (en) * | 1990-03-21 | 1993-04-16 | 이호준 | Vehicle Information Discrimination Device Using Optical Fiber Sensor |
| CN2237234Y (en) * | 1994-12-06 | 1996-10-09 | 叶庆昭 | Full electronic shaft dynamic weighing platform |
| US5798983A (en) * | 1997-05-22 | 1998-08-25 | Kuhn; John Patrick | Acoustic sensor system for vehicle detection and multi-lane highway monitoring |
| CN2395259Y (en) * | 1999-10-08 | 2000-09-06 | 陈志强 | Dynamic electronic automobile scale |
| CN2391180Y (en) * | 1999-10-27 | 2000-08-09 | 郭纪隆 | Removable electronic vehicle weighing apparatus |
| KR100462749B1 (en) * | 2002-05-09 | 2004-12-20 | 고속도로정보통신(주) | Apparatus for measuring weight of car using optical fiber sensor |
| CN1414350A (en) * | 2002-11-27 | 2003-04-30 | 南开大学 | Optical fibre grating torsion sensing device capable of sensing torsion and temperature at the same time |
| JP2005024427A (en) * | 2003-07-03 | 2005-01-27 | Hitachi Cable Ltd | Optical fiber sensor for vehicle weight detection |
| CN2667473Y (en) * | 2004-01-06 | 2004-12-29 | 李叙有 | Butterfly electronic vehicle weighing apparatus bearing platform |
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