CN113299074A - Method for monitoring automobile overspeed based on distributed optical fiber - Google Patents
Method for monitoring automobile overspeed based on distributed optical fiber Download PDFInfo
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- CN113299074A CN113299074A CN202110467502.5A CN202110467502A CN113299074A CN 113299074 A CN113299074 A CN 113299074A CN 202110467502 A CN202110467502 A CN 202110467502A CN 113299074 A CN113299074 A CN 113299074A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 69
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002474 experimental method Methods 0.000 claims abstract description 8
- 238000010586 diagram Methods 0.000 claims description 15
- 238000001228 spectrum Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims 2
- SAZUGELZHZOXHB-UHFFFAOYSA-N acecarbromal Chemical compound CCC(Br)(CC)C(=O)NC(=O)NC(C)=O SAZUGELZHZOXHB-UHFFFAOYSA-N 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
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Abstract
The invention relates to an automobile overspeed monitoring technology, in particular to a method for monitoring automobile overspeed based on distributed optical fibers. The method for monitoring the overspeed of the automobile based on the distributed optical fiber comprises the steps of determining the frequency characteristics of the automobile through experiments and monitoring the speed of the automobile on the spot. The advantages are that: the distributed optical fiber equipment in the existing road section is fully utilized, overspeed detection of passing vehicles is realized under the condition of not increasing cost, the whole method is simple in algorithm and small in calculated amount, and the application field of the distributed optical fiber is expanded.
Description
Technical Field
The invention relates to an automobile overspeed monitoring technology, in particular to a method for monitoring automobile overspeed based on distributed optical fibers.
Background
In highway construction, because the side slope geological conditions are hard to be thoroughly recognized in earlier reconnaissance work, and the stability of the side slope is influenced by environmental comprehensive factors and has the characteristic of dynamic change, and the geological conditions of the rock-soil side slope in mountainous areas are complex and large in engineering scale, the involved rock-soil problems are correspondingly more, so that the parts need to be monitored in a key mode, such as: the Touchun transit highway east transit segment project utilizes advantages such as distributed optical fiber interference killing feature is strong, sensitivity is high, full length covers (can monitor to every point, avoids heavy calamity to take place to miss to examine) monitoring, has realized having obtained good effect to the safety monitoring of side slope.
At present, in traffic accidents, overspeed driving accounts for a very high proportion, and commonly adopted monitoring methods comprise radar speed measurement, laser speed measurement and video monitoring, and all the methods need to purchase new equipment, so that the cost is increased. If the distributed optical fiber in the existing side slope can be utilized to monitor the overspeed of the automobile, the road monitoring level is greatly improved under the condition of hardly increasing the cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for monitoring the overspeed of an automobile based on a distributed optical fiber, which effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a method for monitoring automobile overspeed based on distributed optical fiber comprises the following steps of determining automobile frequency characteristics through experiments, wherein the steps of determining the automobile frequency characteristics through the experiments comprise:
s101, enabling an experimental vehicle to pass through a distributed optical fiber starting point of a road section;
s102, regularly recording distributed optical fiber strain data when the experimental vehicle passes by;
s103, displaying the distributed optical fiber strain data obtained in the S102 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s104, finding the frequency of the experimental vehicle;
s105, finding out the amplitude corresponding to the frequency in the spectrum signals of each point on the distributed optical fiber when the test vehicle passes through the starting point, and generating a position/amplitude diagram;
s106, fitting the position/amplitude diagram by a unary linear equation to obtain a function f (x) ═ ax + b, where a is the characteristic of the frequency;
s107, solving the goodness of fit by using the formula (1):
s108, carrying out multiple experiments on automobiles with different loads to obtain a range of the slope a and a goodness-of-fit range;
the method also comprises the step of monitoring the speed of the automobile on site, wherein the step of monitoring the speed of the automobile on site comprises the following steps:
s201, regularly recording distributed optical fiber strain data when social vehicles pass through a road section;
s202, displaying the distributed optical fiber strain data obtained in the step 201 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s203, finding a frequency set W { f1, f2 … } in which each point in the distributed optical fiber appears;
s204, generating a position/amplitude diagram of each frequency;
s205, fitting the frequency position/amplitude graphs by using a unary linear equation;
s206, reserving the frequencies of the slope a and the goodness of fit in the range to obtain a frequency set V { f1, f2 … };
s207, selecting one frequency in the frequency set V { f1, f2 … }, taking a starting point on the distributed optical fiber as a reference point, and finding out the time Ti with the maximum frequency amplitude at the point;
s208, setting a time window as k, obtaining the amplitude of the frequency at Ti-k, Ti-k +1 … Ti … Ti + k on a reference point to obtain a time/amplitude diagram, obtaining k by using a formula (2),
where h is the distance from the starting point to the end point of the distributed fiber, vdIs the designed speed, t, of the road section where the distributed optical fiber is locatedpIs the time interval set by the distributed optical fiber equipment, and b is the multiplying power, and the value is 1-3; optionally, vdOr the real-time speed of the road section where the distributed optical fiber is located;
s209, fitting the time/amplitude diagram to obtain Ts corresponding to the maximum amplitude value in a fitting function;
s210, repeating the step 208 and the step 210, wherein the reference point is changed into the tail end point of the distributed optical fiber, and the time Te of the automobile passing through the tail end point of the distributed optical fiber is obtained;
s211, obtaining the automobile speed V by the formula V ═ h/(Te-Ts), wherein h is the distance from the starting point to the end point of the distributed optical fiber, and alarming if the automobile speed is overspeed.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the method includes step S212, and the step S212 includes repeating step S207 to step S211 to find all the vehicle speeds.
Further, in S102, the time interval is the minimum value of the distributed optical fiber device.
Further, in S201, the time interval is the minimum value of the distributed optical fiber device.
The invention has the beneficial effects that: the distributed optical fiber equipment in the existing road section is fully utilized, overspeed detection of passing vehicles is realized under the condition of not increasing cost, the whole method is simple in algorithm and small in calculated amount, and the application field of the distributed optical fiber is expanded.
Drawings
FIG. 1 is a flow chart of a method for experimentally determining automobile frequency characteristics in an inventive method for monitoring automobile overspeed based on distributed optical fibers;
FIG. 2 is a flow chart of a method for monitoring the speed of a vehicle in real time in the method for monitoring the overspeed of the vehicle based on the distributed optical fiber.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example (b): as shown in fig. 1 and 2, the method for monitoring overspeed of vehicle based on distributed optical fiber of this embodiment is characterized in that,
the method comprises the following steps of determining the automobile frequency characteristic through experiments, wherein the steps of:
s101, enabling an experimental vehicle to pass through a distributed optical fiber starting point of a road section;
s102, regularly recording distributed optical fiber strain data when the experimental vehicle passes by, and taking the minimum value of distributed optical fiber equipment at time intervals;
s103, displaying the distributed optical fiber strain data obtained in the S102 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s104, finding the frequency of the experimental vehicle;
s105, finding out the amplitude corresponding to the frequency in the spectrum signals of each point on the distributed optical fiber when the test vehicle passes through the starting point, and generating a position/amplitude diagram;
s106, fitting the position/amplitude diagram by a unary linear equation to obtain a function f (x) ═ ax + b, where a is the characteristic of the frequency;
s107, solving the goodness of fit by using the formula (1):
s108, carrying out multiple experiments on automobiles with different loads to obtain a range of the slope a and a goodness-of-fit range;
the method also comprises the step of monitoring the speed of the automobile on site, wherein the step of monitoring the speed of the automobile on site comprises the following steps:
s201, regularly recording distributed optical fiber strain data when social vehicles pass through a road section, and taking the minimum value of distributed optical fiber equipment at time intervals;
s202, displaying the distributed optical fiber strain data obtained in the step 201 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s203, finding a frequency set W { f1, f2 … } in which each point in the distributed optical fiber appears;
s204, generating a position/amplitude diagram of each frequency;
s205, fitting the frequency position/amplitude graphs by using a unary linear equation;
s206, reserving the frequencies of the slope a and the goodness of fit in the range to obtain a frequency set V { f1, f2 … };
s207, selecting one frequency in the frequency set V { f1, f2 … }, taking a starting point on the distributed optical fiber as a reference point, and finding out the time Ti with the maximum frequency amplitude at the point;
s208, setting a time window as k, obtaining the amplitude of the frequency at Ti-k, Ti-k +1 … Ti … Ti + k on a reference point to obtain a time/amplitude diagram, obtaining k by using a formula (2),
where h is the distance from the starting point to the end point of the distributed fiber, vdIs the designed speed, t, of the road section where the distributed optical fiber is locatedpIs the time interval set by the distributed optical fiber equipment, and b is the multiplying power, and the value is 1-3; optionally, vdOr the real-time speed of the road section where the distributed optical fiber is located;
s209, fitting the time/amplitude diagram to obtain Ts corresponding to the maximum amplitude value in a fitting function;
s210, repeating the step 208 and the step 210, wherein the reference point is changed into the tail end point of the distributed optical fiber, and the time Te of the automobile passing through the tail end point of the distributed optical fiber is obtained;
s211, obtaining the automobile speed V by a formula V which is h/(Te-Ts), wherein h is the distance from the starting point to the tail end point of the distributed optical fiber, and alarming if the automobile speed is overspeed;
s212, the step S212 includes repeating S207-S211 to obtain all the vehicle speeds.
The whole method utilizes the distributed optical fiber in the existing side slope to monitor the overspeed of the automobile, greatly improves the road monitoring level, the machine tool market value and the economic benefit under the condition of hardly increasing the cost, and reduces the cost investment of road safety monitoring.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for monitoring overspeed of an automobile based on distributed optical fiber is characterized in that,
the method comprises the following steps of determining the automobile frequency characteristics through experiments, wherein the steps of:
s101, enabling an experimental vehicle to pass through a distributed optical fiber starting point of a road section;
s102, regularly recording distributed optical fiber strain data when the experimental vehicle passes by;
s103, displaying the distributed optical fiber strain data obtained in the S102 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s104, finding the frequency of the experimental vehicle;
s105, finding out the amplitude corresponding to the frequency in the spectrum signals of each point on the distributed optical fiber when the test vehicle passes through the starting point, and generating a position/amplitude diagram;
s106, fitting the position/amplitude diagram by using a unary linear equation to obtain a function f (x) ═ ax + b, wherein a is the characteristic of the frequency;
s107, solving the goodness of fit by using the formula (1):
wherein, yiIs obtained by fitting a function f (x) to obtain yiIs a measure of the actual value of the measurement,
is the average of the actual measurements, n is the total number of points on the distributed fiber; the goodness-of-fit is a characteristic of the frequency;
s108, carrying out multiple experiments on automobiles with different loads to obtain a range of the slope a and a goodness-of-fit range;
further comprising monitoring vehicle speed in-situ, said monitoring vehicle speed in-situ comprising the steps of:
s201, regularly recording distributed optical fiber strain data when social vehicles pass through a road section;
s202, displaying the distributed optical fiber strain data obtained in the step 201 by using a time domain, and converting a time domain signal into a frequency spectrum signal by using Fourier transform;
s203, finding a frequency set W { f1, f2 … } in which each point in the distributed optical fiber appears;
s204, generating a position/amplitude diagram of each frequency;
s205, fitting the frequency position/amplitude graphs by using a unary linear equation;
s206, reserving the frequencies of the slope a and the goodness of fit in the range to obtain a frequency set V { f1, f2 … };
s207, selecting one frequency in the frequency set V { f1, f2 … }, taking a starting point on the distributed optical fiber as a reference point, and finding out the time Ti with the maximum frequency amplitude at the point;
s208, setting a time window as k, taking the amplitude of the frequency at Ti-k, Ti-k +1 … Ti … Ti + k on a reference point to obtain a time/amplitude diagram, obtaining k by using a formula (2),
where h is the distance from the starting point to the end point of the distributed fiber, vdIs the designed speed, t, of the road section where the distributed optical fiber is locatedpIs the time interval set by the distributed optical fiber equipment, and b is the multiplying power, and the value is 1-3; optionally, vdOr the real-time speed of the road section where the distributed optical fiber is located;
s209, fitting the time/amplitude diagram to obtain Ts corresponding to the maximum amplitude value in a fitting function;
s210, repeating the step 2087-209, wherein the reference point is changed to the end point of the distributed optical fiber, and the time Te of the automobile passing through the end point of the distributed optical fiber is obtained;
s211, obtaining the automobile speed V by the formula V ═ h/(Te-Ts), wherein h is the distance from the starting point to the end point of the distributed optical fiber, and alarming if the automobile speed is overspeed.
2. The method for monitoring the overspeed of the car based on the distributed optical fiber as claimed in claim 1, further comprising S212, wherein said S212 comprises repeating S207-S211 to find all the car speeds.
3. The method for monitoring the overspeed of the automobile based on the distributed optical fiber as claimed in claim 1, wherein: in S102, the time interval is the minimum value of the distributed optical fiber device.
4. The method for monitoring the overspeed of the automobile based on the distributed optical fiber according to claim 1, wherein: in S201, the time interval is the minimum value of the distributed optical fiber device.
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