KR101105854B1 - System for measuring vehicle-weight automatically using bridge response, and method for the same - Google Patents

Abstract

PURPOSE: A system for measuring vehicle-weight automatically using bridge response and a method for the same are provided to automatically determine the overloading of a vehicle. CONSTITUTION: A system for measuring vehicle-weight automatically using bridge response comprises a bridge response characteristics acquisition unit(110), a bridge response data processing unit(120) and an over-load vehicle detecting unit(130). The bridge response characteristics acquisition unit comprises a strain gauge(111) installed the main girder and a longitudinal stiffener strain gauge(112) installed in a longitudinal stiffener. The bridge response data processing unit determines whether the degeneracy and total weight of the running vehicle are over a tolerance. The license plate numbers of the overloaded vehicles is recognized and transmits the overloaded vehicles information.

Description

Vehicle weight measurement system using bridge response characteristics and method thereof {SYSTEM FOR MEASURING VEHICLE-WEIGHT AUTOMATICALLY USING BRIDGE RESPONSE, AND METHOD FOR THE SAME}

The present invention relates to measurement of vehicle weight using bridge response characteristics. More particularly, a strain gauge as a measurement sensor is installed in a bridge member to acquire bridge response characteristics, which are strains of a bridge generated when a vehicle passes through a bridge. The present invention relates to a vehicle weight measurement system and a method using a bridge response characteristic for calculating an inter-axle distance, a traveling speed, an axle weight, and a gross weight of a vehicle, and automatically determining whether or not the vehicle is overloaded.

1A and 1B are diagrams illustrating installations of mobile and stationary vehicle weight measuring apparatuses used for overload control according to the related art, respectively, to identify and control overload vehicles by measuring vehicle weight, respectively.

In the case of the mobile vehicle weighing apparatus 10, as shown in FIG. There is a problem that it takes a long time, in particular, when driving and stopping a vehicle traveling at high speed, there may be a safety accident such as a traffic accident, there is a problem that excessive costs are directly and indirectly required to identify whether the vehicle is overloaded.

In addition, in the fixed vehicle weight measuring apparatus 20, as shown in Figure 1b, by installing the control box 22 and the display device 23 in the load cell 21 attached to the plate directly contacting the wheel of the vehicle By measuring the vehicle weight, it is identified whether the vehicle is overloaded. In the fixed vehicle weight measuring method, the vehicle weight is measured in a state where the vehicle is slowly entered and stopped to install the plate to measure the vehicle weight.

However, the load cell 21 has a problem in the reliability of the actual vehicle weight measurement value because it is difficult to maintain its performance and increase the possibility of error over time, and also, depending on whether or not the wheel of the vehicle is correctly contacted with the plate, etc. There was a problem that a significant error exists in the vehicle weight result value. Particularly, in the case of a vehicle traveling at a high speed, the vehicle must be approached by the stationary vehicle weight measuring device 20, which inevitably hinders the operation of the vehicle. In addition, even if a plurality of load cells 21 are used, time is required. As the elapse of time, there was a problem that an error due to the deterioration of the load cell 21 may occur.

On the other hand, as a related technology, Korean Patent No. 10-499223 discloses a "vehicle weight measuring method and an overload vehicle identification method using a vehicle weight measuring device", which is attached to the sensor to the road to automatically detect the weight System.

In the case of the overload vehicle identification method using the vehicle load measuring device, the vehicle load measuring means in which the shear deformation sensor is installed is buried under the pavement layer to measure the weight of the traveling vehicle.

On the other hand, as another related technique, a technique of bridge weight-in-motion (BWIM) using the response characteristics of a bridge has been proposed by Moses of the United States, which uses a static moment influence line extracted from the dynamic response of the bridge. That's the way. The BWIM system not only uses the bridge members but also installs sensors on the road surface, for example, axle detectors and strain gauges to measure the weight of the vehicle.

However, when the sensor is installed on the road surface to measure the weight of the traveling vehicle, there is a problem in that the sensor must be installed after removing the pavement and controlling the vehicle at the time of maintenance as well as the time of installation of the sensor. In addition, such a BWIM system has a problem in that it is difficult to apply to long span bridges. For example, in the case of long span bridges, many vehicles pass, so that the influence of vehicle loads outside the measurement section has a large influence on the overall estimation accuracy. As a result, there is a problem that the estimation accuracy of the individual loads is very low.

1) Republic of Korea Patent No. 10-499223 (application date: March 04, 2003), the title of the invention: "Method of vehicle weight measurement and overload vehicle identification method using the vehicle weight measurement device" 2) Republic of Korea Patent No. 10-486773 (application date: March 11, 2004), the title of the invention: "Automation method and apparatus for overload vehicle crackdown" 3) Republic of Korea Patent No. 10-0445312 (Application Date: April 14, 2004), the title of the invention: "Overload vehicle control system and method" 4) Republic of Korea Patent No. 10-685006 (Application Date: January 26, 2005), the title of the invention: "Overload vehicle control method and system" 5) Republic of Korea Utility Model Registration No. 20-376644 (Application date: December 08, 2004), Name of the design: "Installation structure for bridge overload detection device"

The technical problem to be solved by the present invention is to install a measuring sensor (strain gauge) in various parts of the bridge, and to obtain, process and analyze the response of the bridge generated when the vehicle passes, It is an object of the present invention to provide a vehicle weight measuring system using the bridge response characteristic and a method thereof, which can automatically and accurately check the load, gross weight, the distance between the axes, the traveling speed, and the license plate.

Another technical problem to be solved by the present invention is to automatically measure the characteristics of the driving vehicle passing through the bridge in real time, and when the legal weight exceeds the relevant department of the overload vehicle characteristics (gross weight, axial weight, inter-axle distance, running speed, etc.) It is to provide a vehicle weight measurement system and method using the bridge response characteristics that can be transmitted.

As a means for achieving the above-described technical problem, the vehicle weight measurement system using the bridge response characteristics according to the present invention, in the vehicle weight measurement system for measuring the weight of the running vehicle passing through the bridge to control the overload Bridge response characteristics for acquiring bridge response characteristics (strain), which are strains according to time generated when the traveling vehicle travels on the upper part of the bridge, provided with the housing strain strain gauge installed in the housing and the vertical reinforcement strain gauge installed in the vertical reinforcement. Acquisition unit; The axle detection, the number of axles, the distance between the axles and the traveling speed of the traveling vehicle are calculated using the bridge response characteristics by the vertical reinforcement strain gauge, and the load bearing of the traveling vehicle is carried out by using the bridge response characteristics of the housing the strain gauge. And a bridge response data processing unit for obtaining a gross weight and determining whether the running weight and the gross weight of the traveling vehicle exceed an allowable standard. And an overload vehicle control unit for recognizing the vehicle number of the overload vehicle and transmitting the overload vehicle information when the bridge response data processor determines that the weight and gross weight of the traveling vehicle exceed an allowable standard.

Here, the bridge response characteristics acquisition unit, the housing further strain gauge is installed in the housing further extending in the longitudinal direction (bridge direction) of the bridge, and obtains the bridge response characteristics from the housing of the long strain affecting line length; And a vertical reinforcement strain gauge installed in a vertical reinforcement disposed in a vertical direction for reinforcing the steel structural member of the bridge, and obtaining a bridge response characteristic from a vertical reinforcement having a short strain influence line length.

The bridge response data processor may include: a dynamic amplifier configured to amplify a bridge response characteristic which is an analog signal; An A / D converter for converting a bridge response characteristic of the amplified analog signal into a digital signal; A vehicle information DB storing vehicle classification information, vehicle model information, body information, and axle arrangement information; The axle detection, axle number, inter-axle distance and traveling speed of the traveling vehicle are calculated using the bridge response characteristic of the vertical reinforcement strain gauge, and the load response of the running vehicle is determined using the bridge response characteristic of the housing the strain gauge. A vehicle weight calculation unit for obtaining a gross weight; And it may include an overload determination unit for determining whether the weight of the vehicle and the gross weight of the vehicle exceeds the acceptance criteria.

), 축간 거리(

)를 알고 있는 시험차량에 의해 미리 구해진 주거더의 단위하중에 의한 변형률영향선(

) 및 상기 측정 대상 차량의 축중 및 축간 거리를 조합하여, 상기 측정 대상 차량의 주거더 변형률의 실측치와의 오차가 최소화되는 방향으로 최적화하는 것을 특징으로 한다.Here, the vehicle weight calculation unit, the weight (

), The distance between axes (

Strain influence line due to the unit load of the housing head previously obtained by the test vehicle knowing

And the distance between the shaft weight and the shaft of the vehicle to be measured, to optimize the direction in which the error with the actual value of the strain of the housing of the vehicle to be measured is minimized.

Here, the vehicle weight calculation unit is to calculate the total weight of the driving vehicle for only the variation of the live load strain by separating the response by the temperature deformation and the response by the live load, for the measurement results including the live load strain and the temperature strain It features.

Here, the vehicle weight calculation unit is characterized in that the trigger (Trigger) function that operates only for the strain that the maximum strain of the housing the center portion generated when traveling on the bridge is a certain amount or more is set.

The overload vehicle control unit may be a camera installed at a predetermined height of the bridge to photograph the vehicle number of the overload vehicle.

On the other hand, as another means for achieving the above-described technical problem, the vehicle weight measurement method using the bridge response characteristics according to the present invention, in the vehicle weight measurement method for measuring the weight of the running vehicle passing through the bridge to control the overload a) measuring the bridge response characteristics (strain) by the housing strain strain gauge installed in the housing and the vertical reinforcement strain gauge installed in the vertical reinforcement when the vehicle to be measured passes the bridge; b) calculating axle detection, number of axles, distance between axles and traveling speed of the vehicle to be measured by using the bridge response characteristics by the vertical reinforcement strain gauge; c) separating the passing vehicle according to the vehicle type discrimination algorithm; d) optimizing in a direction in which the error of the residential strain is minimized; e) calculating the weight and total weight of the vehicle to be measured; And f) determining whether the overload vehicle is compared by comparing whether the weight of the vehicle to be measured and the gross weight exceed an allowable standard.

Vehicle weight measurement method using the bridge response characteristics according to the present invention, g) when it is determined that the vehicle weight and the gross weight of the vehicle to be measured is an overload vehicle that exceeds the acceptance criteria, the vehicle number of the overload vehicle is recognized by the overload vehicle information The method may further include transmitting.

), 축간 거리(

)를 알고 있는 시험차량에 의해 미리 구해진 주거더의 단위하중에 의한 변형률영향선(

) 및 상기 측정 대상 차량의 축중 및 축간 거리를 조합하여, 상기 측정 대상 차량의 주거더 변형률의 실측치와의 오차가 최소화되는 방향으로 최적화하는 것을 특징으로 한다.Here, the step d) is,

), The distance between axes (

Strain influence line due to the unit load of the housing head previously obtained by the test vehicle knowing

And the distance between the shaft weight and the shaft of the vehicle to be measured, to optimize the direction in which the error with the actual value of the strain of the housing of the vehicle to be measured is minimized.

According to the present invention, a measurement sensor (strain gauge) is installed at various parts of a bridge, and the response, bridge, and distance of the running vehicle are acquired, processed, and analyzed by acquiring, processing, and analyzing the response of the bridge generated when the vehicle passes. Can be automatically and accurately verified.

 According to the present invention, it is easy to install and maintain under daily use conditions without vehicle control, and uses a relatively low cost and general measuring equipment to automatically measure the characteristics of the driving vehicle passing through the bridge in real time, when legal weight is exceeded. The characteristics of the overload vehicle (gross weight, axle weight, distance between axles, speed of travel, etc.) can be immediately transmitted to the relevant department. Accordingly, the cost and time required for the overloading of the vehicle can be greatly saved, and contributing to the prevention of the overload and the speeding of the vehicle can contribute to the reduction of soot emissions.

According to the present invention, it is possible to accurately grasp the actual weight of the traffic vehicle can be applied to the prediction of the life of the bridge structure as well as the revision of the design standards of roads and road structures can be utilized to establish an effective maintenance policy.

1A and 1B are installation diagrams of a mobile and stationary vehicle weighing apparatus used for overload control according to the prior art, respectively.
2 is a diagram illustrating a strain gauge installed on a bridge for vehicle weight measurement according to an embodiment of the present invention.
3 is a block diagram of a vehicle weight measurement system using the bridge response characteristics according to an embodiment of the present invention.
4 is a diagram illustrating vehicle classification data applied to a vehicle weight measuring system using a bridge response characteristic according to an exemplary embodiment of the present invention.
5 is an operation flowchart of the vehicle weight measuring method using the bridge response characteristics according to an embodiment of the present invention.
FIG. 6 is a detailed flowchart illustrating a preliminary measurement process by the test vehicle illustrated in FIG. 5.
7 is a diagram illustrating a process of calculating a residential strain rate influence line applied to a vehicle weight measuring method using a bridge response characteristic according to an exemplary embodiment of the present invention.
8 is a perspective view of a target bridge on which a vehicle weight measuring system using a bridge response characteristic according to an exemplary embodiment of the present invention is installed.
FIG. 9 is a diagram illustrating a strain response according to temperature deformation and a live load, a strain response according to temperature deformation, and a strain response according to a live load in a vehicle weight measuring system using a bridge response characteristic according to an exemplary embodiment of the present invention.
10 is a diagram illustrating a dynamic characteristic correction concept in a vehicle weight measurement system using a bridge response characteristic according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the term "part" or the like, as described in the specification, means a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

2 is a diagram illustrating a strain gauge installed on a bridge for vehicle weight measurement according to an embodiment of the present invention, Figure 3 is a block diagram of a vehicle weight measurement system using the bridge response characteristics according to an embodiment of the present invention 4 is a diagram illustrating vehicle classification data applied to a vehicle weight measurement system using a bridge response characteristic according to an embodiment of the present invention.

First, referring to FIG. 2, at least one strain gauge is present in the housingder 210 and the vertical reinforcement 220 of the bridge 200 through which the vehicle 300 passes for measuring the vehicle weight according to an embodiment of the present invention. The camera 130, which recognizes the vehicle number of the overloaded vehicle, is installed at one side of the bridge 200.

For example, as shown in the AA cross section, the housing strain strain 111 is installed in the housing deck 210 of the bridge 200, and, as shown in the BB cross section, in the vertical stiffener 220 Vertical reinforcement strain gauges 112 may be installed respectively.

In the vehicle weight measurement system using the bridge response characteristic according to the embodiment of the present invention, a bridge member having a long influence line length through the driving of a test vehicle (a vehicle that knows the distance between the axis and the axis of the vehicle in advance) of the target bridge 200. For example, the strain influence line by the unit load of the housing | casing 210 is calculated previously. Thereafter, the vehicle 300 is detected using the strain response of the bridge member having a short influence line, for example, the vertical stiffener 220, to obtain various information about the vehicle when the vehicle 300 is driven, and the axle Calculate the number, speed, and distance between the wheels. In addition, using the strain response line of the bridge member 210 having a long influence line length and the strain influence line by the unit load, the shaft weight and the gross weight of the traveling vehicle 300 are obtained.

Specifically, referring to Figure 3, vehicle weight measurement system 100 using the bridge response characteristics according to an embodiment of the present invention, the bridge response characteristics acquisition unit 110, bridge response data processing unit 120 and overload vehicle crackdown The unit 130 is included.

The bridge response characteristic acquisition unit 110 includes a housing strain strain gauge 111 and a vertical reinforcement strain gauge 112 installed in the bridge 200, such strain gauges 111 and 112, for example, strain gauges. The strain gage is attached to the surface of the housingder 210 and the vertical reinforcement 220, respectively, in order to measure the deformation state and the amount of the housingder 210 and the vertical reinforcement 220, so that the vehicle 300 is a bridge. The strain according to time generated when driving the upper portion of the 200, that is, the bridge response characteristics are obtained.

Specifically, the housing the strain gauge 111 is installed on the bridge member having a long length of the strain influencing line extending in the longitudinal direction (crossing direction) like the housing 210, the vertical reinforcement strain gauge 112 is vertical Like the reinforcement 112, the strain influencing line is shortly installed in the bridge member. In this case, the vertical stiffener 112 may be a vertical stiffener (Vertical Stiffener) disposed in the vertical direction for the reinforcement of the steel structural member of the bridge (200).

Accordingly, the vehicle weight calculation unit 124 of the bridge response data processing unit 120 uses the bridge response characteristic (strain) by the vertical reinforcement strain gauge 112 to detect the axle, number of axles, and shaft axle of the traveling vehicle 300. Calculate distance and speed. In addition, the vehicle weight calculation unit 124 of the bridge response data processing unit 120 may calculate the weight and total weight of the traveling vehicle using the bridge response characteristic (strain) by the housing strain gauge 111.

In detail, the bridge response characteristic acquisition unit 110 may process the bridge response characteristic (strain) obtained by the bridge response characteristic acquisition unit 110. The information DB 123, the vehicle weight calculation unit 124, and the overload determination unit 125 may be included, but are not limited thereto.

The amplifier 121 is a dynamic amplifier, and serves to amplify a bridge response characteristic (strain), which is an analog signal, and the A / D converter 122 is a bridge response characteristic (strain), which is the amplified analog signal. ) Is converted into a digital signal.

The vehicle information DB 123 is a database in which vehicle information such as vehicle classification information, vehicle model information, vehicle body information, and axle arrangement information is stored in advance. As shown in FIG. 4, the vehicle information DB 123 divides a passenger car, a mini truck, a bus, a small van, a medium van, and a large van, and the body and axle arrangement (2 rows, 3 rows, etc.) according to each vehicle type. Since the vehicle information is stored for the vehicle weight calculation unit 124 to run the bridge 200 in comparison with the vehicle information and the bridge response characteristics generated when the vehicle 300 runs the bridge 200 It is possible to determine what vehicle the vehicle 300 is. In addition, the vehicle information DB 123 is for the strain affecting line due to the unit load of the housing member 210, which is a bridge member having a long influence line length, which is calculated in advance through the running of a test vehicle that knows the distance between the shaft and the load. The data is saved.

The vehicle weight calculator 124 is realized as a running vehicle weight and gross weight calculation application program stored in a desktop PC or a notebook computer. In other words, the application program for calculating the weight and gross weight of a running vehicle, the equation of the strain influence line due to the unit load of the bridge member with a long influence line length for the test vehicle, the axle detection using the strain response characteristics of the bridge member with a short influence line length, The axle number, the traveling speed and the distance between the axle equation, vehicle classification reading application, may include an application for determining whether or not overload vehicle.

The overload determination unit 125 determines whether the weight and the total weight of the traveling vehicle 300 calculated by the vehicle weight calculation unit 124 exceed an allowable standard.

In addition, the overload vehicle control unit 130 recognizes the vehicle number of the driving vehicle 300 when the overload determination unit 125 determines that the accumulation weight and the gross weight of the traveling vehicle exceed the allowable criteria, and the overload vehicle information is recognized. It is responsible for transmitting to. For example, the overload vehicle control unit 130 may be a camera installed at a predetermined height of the bridge 200.

As described above, the bridge response characteristic acquisition unit 110 is embodied as strain gauges 111 and 112, and the bridge response data processing unit 120 includes a dynamic amplifier 121, an A / D converter 122, and a traveling vehicle. A computer (laptop computer, etc.) equipped with an application program for determining axle number, driving speed, inter-axle distance, weight and gross weight, and whether or not an overload vehicle is included, and a database for vehicle information, the overload vehicle control unit 130 It may be embodied as an overload camera, but is not limited thereto.

The vehicle weight measurement system 100 using the bridge response characteristic according to an exemplary embodiment of the present invention uses the response characteristic of the bridge 200 generated by the driving vehicle 300 to drive the vehicle speed and the distance between the shafts. In contrast to the conventional method, the sensor does not install any sensors, such as strain gauges, on the road surface, but only responds to bridge members. There is a characteristic that does not affect at all.

5 is a flowchart illustrating a method of measuring a vehicle weight using a bridge response characteristic according to an exemplary embodiment of the present invention, and FIG. 6 is a detailed flowchart illustrating a preliminary measurement process by the test vehicle illustrated in FIG. 5. Looking at the method of measuring the weight of the running vehicle using the weight measurement system of the running vehicle using the response characteristics as follows.

5 and 6, in the vehicle weight measurement method using the bridge response characteristics according to an embodiment of the present invention, first, the strain influence line due to the unit load of the housing by the test vehicle is determined ( S110 ). Specifically, the housing strain strain line by the test vehicle is measured in advance as in steps S111 to S115 of FIG. 6.

)을 미리 구하여 차량정보 DB에 저장한다.Since the pre-measurement has different bridge response characteristics (strain influence line) for each bridge 200, the test vehicle is driven in advance to the target bridge, whereby the strain influence line due to the unit load of the housing unit 210 (

) Is obtained in advance and stored in the vehicle information DB.

), 축간 거리(

)를 알고 있는 상태이다.At this time, the test vehicle, since one test vehicle is determined by the vehicle type classification shown in FIG.

), The distance between axes (

I know).

In addition, the bridge 200 is provided with the above-described housing the strain gauge 111 and the vertical reinforcement strain gauge 112 are separately installed to measure the strain by the traveling vehicle 300.

)을 결정하게 된다.Here, since the vertical reinforcement strain gauge 112 is for estimating the axle and the number of axles, the traveling speed and the distance between the axles, in the measurement by the test vehicle knowing the vehicle model, the strain influence line is formed long such as the housing 210. Strain influence line due to unit load of bridge member

).

A method of obtaining a strain influence line due to a unit load by using the response of a bridge member having a long influence line like the housing der 210 will be described with reference to FIG. 7. 7 is a diagram illustrating a process of calculating a residential strain rate influence line applied to a vehicle weight measuring method using a bridge response characteristic according to an exemplary embodiment of the present invention.

)에 의한 변형률 응답(도 7의 b) 참조)과 후륜(

)에 의한 변형률 응답(도 7의 c) 참조)이 중첩된 것이다.In the vehicle weight measurement method using the bridge response characteristics according to an embodiment of the present invention, if the test vehicle having a known load, the distance between the shaft and the traveling speed is known to pass through the bridge 200, d) of FIG. The same strain response is obtained. This strain response is the front wheel of the test vehicle.

Strain response (see b) of FIG. 7) and the rear wheel (

Strain response (see c) of FIG. 7) is superimposed.

At this time, the strain response by the front wheel and the rear wheel having a temporal deviation according to the position difference (d) between the front and rear axles has a similar form except for the temporal deviation according to the position (distance between the axles) of the axle.

라 하면, 도 7의 d)에 도시된 시험차량의 축중(

)인 전륜(

) 및 후륜(

)에 의한 주거더의 변형률응답(

)은 다음의 수학식 1과 같이 표현될 수 있다.Specifically, the strain influence line due to the unit load, as shown in Figure 7a)

If it is, the accumulation of the test vehicle shown in (d) of FIG.

Front wheel ()

) And rear wheels

Strain response of the housing by

) May be expressed as Equation 1 below.

및

는 각각 전륜 및 후륜의 축중을 나타내고,

는 전륜과 후륜의 통과시각 차이를 나타낸다.here,

And

Denotes the declination of the front and rear wheels, respectively

Represents the difference in the passing time of the front wheel and the rear wheel.

), 시험차량의 전륜과 후륜의 축중인

과

, 시험차량의 전륜과 후륜의 통과시각 차이(

)는 시험차량의 축간 거리와 주행속도로부터 계산된 기지의 값이므로 상기 단위하중에 의한 변형률영향선(

)을 구할 수 있다.At this time, the strain response of the housing (210) by the test vehicle in the equation (1)

In the front and rear wheels of the test vehicle

and

Difference in the passing time between the front and rear wheels of the test vehicle (

) Is a known value calculated from the axial distance and the traveling speed of the test vehicle.

) Can be obtained.

As such, when the strain influencing line due to the unit load of the housing der 210 is determined by Equation 1, the load and the total weight of the traveling vehicle 300 can be obtained.

Referring back to FIG. 5, the driving speed, the distance between the axes, the weight, and the gross weight, which are all characteristics of the traveling vehicle, may be determined as follows.

When the vehicle to be measured passes the bridge ( S120 ), the housing strainer gauge installed in the housingder and the vertical reinforcement strain gauge installed in the vertical reinforcement measure the bridge response characteristics (strain), respectively ( S130 ).

Next, the axle detection, the number of axles, the distance between the axles and the traveling speed of the measurement target vehicle are calculated using the bridge response characteristic by the vertical reinforcement strain gauge ( S140 ).

In other words, the axle of the traveling vehicle 200 is detected using the response of the bridge member having a short influence line like the vertical reinforcement, the driving speed and the distance between the axes are calculated, and the calculated driving speed, the distance between the shafts, and the above-described math. The load factor for any vehicle 300 is combined by combining the strain influence line due to the unit load of the housing unit 210 according to Equation 1 with the measured strain response of the housing unit 210 obtained when the vehicle 300 is driven. Calculate Of course, since the vehicle type can be determined using the calculated inter-axle distance and the vehicle information DB 123, the total weight can be calculated by summing the weights of the vehicle for any driving vehicle 300.

At this time, the traveling position on the bridge 200 of the traveling vehicle 300 passing through the bridge 200 is represented by the position of the lane and the vehicle travel direction. Since the traveling direction position of the traveling vehicle 300 is calculated by the time when the traveling vehicle 300 passes the reference position of the bridge 200 and the traveling speed of the traveling vehicle 300, it is necessary to measure this.

In the exemplary embodiment of the present invention, the response characteristics of the bridge member having a short length of the influence line, that is, the vertical stiffener 220, are used to determine the time and the lane at which the axle of the traveling vehicle 300 passes the reference position of the bridge 200. Will be used.

FIG. 8 is a perspective view of a target bridge on which a vehicle weight measuring system using a bridge response characteristic according to an exemplary embodiment of the present invention is installed. The vertical reinforcement 220 is illustrated in FIG. As a member installed on the side of the abdomen between the flange 201 and the lower flange 202, the deformation occurs only for a short time when the axle passes directly above the vertical stiffener 220, it is suitable for measuring the axle passage. In addition, the running speed of the vehicle 300 is also calculated using the response characteristics of the vertical reinforcement (220).

Specifically, the traveling vehicle passing through the spaced vertical stiffener 220 by attaching the strain gauges 112 (two measuring points A and B) to the vertical stiffener 220 spaced by a predetermined distance in the bridge longitudinal direction (separation distance). By measuring the strain by, it is possible to know the passing time of the axle of the two measuring points, and by applying the separation distance of the two measuring points known here, the traveling speed of the traveling vehicle 300 can be easily calculated.

For example, when the axle passes a specific point A, the deformation occurs only for a short time at the point A, so that the axle is detected and the number of passing axles can be known. In addition, the axle distance of the traveling vehicle 300 can be calculated from the time difference between the axle passing through the point A and the next axles passing the point A and the traveling speed.

The vehicle model of the traveling vehicle 300 can be classified using the above-described FIG. 4 according to the measured axle number and axle distance.

, 차축거리), 주행속도(v)를 계측하게 되면 차량중량 계산부(124)에 의하여 축중(Pi) 및 총중량을 계산할 수 있는데 이는 전술한 시험차량의 주행을 통해 구한 주거더(210)의 단위하중에 의한 변형률영향선을 이용하여 계산하게 된다.Accordingly, the number of axles and the distance between the axles of the traveling vehicle 300 (

, Axle distance), and the traveling speed (v) can be calculated by the vehicle weight calculation unit 124 to calculate the weight (Pi) and gross weight, which is the unit of the housing (210) obtained through the driving of the test vehicle described above It is calculated using the strain influence line due to the load.

), 축간 거리(

)를 알고 있는 시험차량에 의해 미리 구해진 주거더의 단위하중에 의한 변형률영향선(

) 및 상기 측정 대상 차량의 축중 및 축간 거리를 조합하여, 상기 측정 대상 차량의 주거더 변형률의 실측치와의 오차가 최소화되는 방향으로 최적화한다.Next, the passing vehicle is separated according to the vehicle type discrimination algorithm ( S150 ), and optimized in a direction in which an error with the measured value of the housing strain is minimized ( S160 ). That is,

), The distance between axes (

Strain influence line due to the unit load of the housing head previously obtained by the test vehicle knowing

) And the load and the distance between the shaft of the vehicle to be measured are optimized in a direction in which an error with the actual value of the housing strain of the vehicle to be measured is minimized.

Next, the weight and total weight of the vehicle to be measured are calculated ( S170 ).

)가 수학식 1에 의해 구해진 상태에서 임의의 주행차량(300)이 교량(200) 위를 주행할 때 실제 계측되는 주거더(210)의 변형률응답에 의해 교량을 통과하는 차량(300)의 중량을 구할 수 있다.Strain influence line due to the unit load of the above-mentioned housing (210) (

The weight of the vehicle 300 passing through the bridge by the strain response of the housing 210 actually measured when the arbitrary traveling vehicle 300 travels on the bridge 200 in the state obtained by Equation 1). Can be obtained.

)와 단위하중에 의한 주거더의 변형률영향선(

)의 관계는 전술한 수학식 1과 동일하다. 이에 임의의 차량(300)이 통과할 때 계측된 변형률응답(

)와 단위하중에 의한 주거더(210)의 변형률영향선(

) 및 수직보강재(220)의 응답으로부터 구한 차축의 통과시각 차이(

)가 기지의 값이고, 축중(

)만이 미지의 값이 된다. 만약 여러 개의 주거더(210)에 대한

와

가 기지의 값이라면, 수학식 1은 연립방정식 형태로 표현되며, 이로부터 축중(

)를 계산할 수 있다.That is, the strain response measured when an arbitrary vehicle 300 passes through the bridge 200 (

) And the strain-influence line of housing houses due to unit load

) Is the same as the above equation (1). Accordingly, the strain response measured when an arbitrary vehicle 300 passes (

) And the strain influence line of the housing der 210 by unit load (

And passing time difference of the axle obtained from the response of the vertical stiffener 220 (

) Is a known value, and

) Is unknown. If for more housing 210

Wow

If is a known value, Equation 1 is expressed as a system of simultaneous equations,

) Can be calculated.

Next, the overload vehicle is determined by comparing whether the weight of the vehicle under measurement and the gross weight exceed an allowable standard ( S180 ), and after that, the load and gross weight of the vehicle under measurement are determined to be an overload vehicle exceeding an allowable standard. If the vehicle number of the overloaded vehicle is recognized, the overloaded vehicle information is transmitted ( S190 ).

9 is a diagram illustrating a strain response according to temperature deformation and a live load, a strain response according to temperature deformation, and a strain response according to a live load in a vehicle weight measuring system using a bridge response characteristic according to an exemplary embodiment of the present invention.

As shown in a) of FIG. 9, the strain measured by the bridge member includes two components, a strain due to live load (hereinafter referred to as a live load strain) and a strain due to temperature change (hereinafter referred to as a temperature strain). In the vehicle weight measurement system using the bridge response characteristic according to an embodiment of the present invention, the total weight of the driving vehicle should be calculated only for the variation of the live load strain, so as to the measurement result, as shown in FIG. It is necessary to separate the response by and the response by live load, as shown in FIG. 9C.

Since the temperature strain varies with the daily variation of the temperature and the season, as compared with the live load strain, as shown in b) of FIG. 9, the temperature strain has a very long period of variation. That is, for a short time, for example, between 1 and 2 minutes, the change in temperature is so small that it is negligible, so that the change in strain due to temperature hardly occurs. Therefore, the mode value obtained by performing frequency analysis on the measurement data for a short time can be regarded as a strain component due to the influence of temperature. In this way, a vehicle using the bridge response characteristics according to the embodiment of the present invention. Weighing systems include the ability to separate live load strain and temperature strain separately.

10 is a diagram illustrating a dynamic characteristic correction concept in a vehicle weight measurement system using bridge response characteristics according to an exemplary embodiment of the present invention.

When the vehicle travels on the bridge, the response of the bridge is amplified by the road condition, the bridge and the vehicle interaction, and this is called a dynamic load effect. Since the actual weight of the vehicle does not include such dynamic load effect, the vehicle weight measurement system using the bridge response characteristics according to the embodiment of the present invention minimizes the square of the residual, that is, the square of the residual, which is a kind of regression analysis. By the method, as shown in FIG. 10, the dynamic load effect can be eliminated.

이라 하면,

을 초과하는 변형률에 대해서만 본 발명의 실시예에 따른 차량중량 계측 시스템이 작동하도록 설정하는 것이 트리거 기능이다.On the other hand, the types of vehicles using the road are largely classified into passenger cars, buses and vans. Although traffic accounts for most of the traffic, about 60 ~ 70% of total traffic, freight cars, especially large trucks, are the most important factor in establishing the durability and maintenance plans for bridge structures and pavement. Therefore, when using the vehicle weight measurement system according to an embodiment of the present invention for the purpose of establishing a road maintenance plan, it is inefficient to target all vehicles passing through the bridge, so in the embodiment of the present invention, It includes a trigger function for calculating the weight. For example, the maximum strain in the center of a dwelling that occurs when a car travels on a bridge

If you say,

It is a trigger function to set the vehicle weight measuring system according to an embodiment of the present invention to operate only for strains exceeding.

The above-described separation of the live load strain and the temperature strain, the removal of the dynamic load effect, and the trigger function are operated by using the calibration program in the vehicle weight calculation unit 124.

As a result, the vehicle weight measurement system using the bridge response characteristics according to an embodiment of the present invention and the features of the method are summarized as follows.

Firstly, the weight of the vehicle passing through the bridge is measured using the response characteristics of the bridge, and it is determined whether the weight of the measured vehicle exceeds the acceptance criteria, and if it exceeds the acceptance criteria, for example, The vehicle number of the overloaded vehicle can be recognized using the installed camera.

Second, as a method of measuring the weight of a traveling vehicle by using the bridge response characteristics, it can be divided into two types according to the length of the influence line (strain influence line due to load) of the target bridge member. For example, the method of using the response characteristics of a bridge member having a long influence line length may be changed even if the loading position of the bridge perpendicular to the vehicle running direction is slightly changed in the lane compared to the case where the influence line length is short. The magnitude of the change in the response is not large, and it is relatively easy to isolate the dynamic influence caused by the interaction between the vehicle and the bridge. However, when the size of the bridge is large, the influence of the vehicle loaded on the bridge other than the vehicle to be measured is included in the response characteristics due to the long influence line length, and there is a fundamental problem that it is difficult to separate these effects. Accordingly, in the embodiment of the present invention, the weight of the traveling vehicle is measured using not only the method of using the response of the bridge member having a long influence line length but also the response of the bridge member having a short influence line length. At this time, the bridge member having a long length of the influence line is a bridge member that extends in the longitudinal direction (bridge direction), such as the housing (main girder) of the bridge member is formed with a long strain rate influence line due to the load caused by the front wheel or rear wheel of the vehicle It means the case. In addition, the bridge member having a short influence line length, as shown in Figure 8, the vehicle as a bridge member, such as a vertical reinforcement (stiffener) is installed in the vertical direction between the upper side and the lower flange of the girder of the girder of the bridge member It means the case where the strain influence line due to the load by the front wheel or the rear wheel is short in the axial direction. In this case, the influence line quantitatively displays the influence of the strain due to the load from the specific point to another point when the load is applied at a specific point.

Third, the strain influence line due to the unit load of the bridge member whose length is long is influenced in advance by running the test vehicle (vehicle distance between the vehicle and the vehicle whose base is known) on the target bridge. After that, the vehicle is detected by using the strain response of the bridge member having a short influence line length to obtain all kinds of information about the vehicle, and after calculating the number of axles, the traveling speed, and the distance between the shaft members, Using the strain response of and the strain influence line due to the unit load, the load and total weight of the traveling vehicle are obtained.

Fourth, the strain measured in the bridge member includes two components, a strain due to live load (hereinafter referred to as a live load strain) and a strain due to temperature change (hereinafter referred to as a temperature strain). In the embodiment of the present invention, since the vehicle weight is calculated only for the variation of the live load strain, it is necessary to separate the response due to the live load and the temperature strain from the measurement result. Since the temperature strain varies with the daily variation of the temperature and the season, it has a very long-term fluctuation characteristic compared to the live load strain, and the embodiment of the present invention includes the function of separating the live load strain and the temperature strain in consideration of these characteristics. .

Fifth, when a vehicle travels on a bridge, the response of the bridge is amplified by road conditions, bridge interactions, and the like, which is called a dynamic load effect. Since the actual weight of the vehicle is for a state not including the dynamic load effect, the embodiment of the present invention includes a function of removing the dynamic load effect by the least square method or the like.

Sixth, the types of vehicles using roads are largely classified into passenger cars, buses, and vans. Although traffic accounts for most of the traffic, about 60 ~ 70% of total traffic, trucks, especially large trucks, are the most important factor in establishing the durability and maintenance plans of bridge structures and pavements. Therefore, when using the vehicle weight measurement system according to an embodiment of the present invention for the purpose of establishing a road maintenance plan, it is inefficient to target all vehicles passing through the bridge, so in the embodiment of the present invention, Also included is a trigger function to calculate the weight.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: vehicle weight measurement system
200: bridge
300: vehicle
110: bridge response characteristics acquisition unit
120: bridge response data processing unit
130: overload vehicle control unit (camera)
111: housing the strain gauge
112: vertical stiffener strain gauge
121: Dynamic Amplifier
122: A / D Converter (Analog / Digital Converter)
123: vehicle information DB
124: vehicle weight calculation unit
125: Overload Judgment
210: more housing
220: vertical reinforcement

Claims (10)

In a vehicle weight measurement system that measures the weight of a traveling vehicle passing through a bridge and controls overload,
A bridge for acquiring a bridge response characteristic (strain), which is a strain according to time generated when a traveling vehicle travels on an upper portion of a bridge, having a housing girder strain gauge installed in a housing girder and a vertical stiffener strain gauge installed in a vertical stiffener. Response characteristic acquisition unit;
The axle detection, the number of axles, the distance between the axles and the traveling speed of the traveling vehicle are calculated using the bridge response characteristics by the vertical reinforcement strain gauge, and the load bearing of the traveling vehicle is carried out by using the bridge response characteristics of the housing the strain gauge. And a bridge response data processing unit for obtaining a gross weight and determining whether the running weight and the gross weight of the traveling vehicle exceed an allowable standard. And
If the bridge response data processor determines that the overload and the total weight of the running vehicle is an overload vehicle exceeding an allowable standard, the overload vehicle control unit recognizes the vehicle number of the overload vehicle and transmits the overload vehicle information.
The bridge response characteristic acquisition unit may include: a housing strain strain gauge installed in a housing header extending in a longitudinal direction (bridge direction) of the bridge and obtaining a bridge response characteristic from a housing header having a long strain affecting line length; And vehicle reinforcement measurement using bridge response characteristics including a vertical reinforcement strain gauge installed on a vertical reinforcement disposed in a vertical direction for reinforcing the steel structural member of the bridge and obtaining a bridge response characteristic from a vertical reinforcement having a short strain influence line length. system. delete The method of claim 1, wherein the bridge response data processing unit,
A dynamic amplifier for amplifying a bridge response characteristic which is an analog signal;
An A / D converter for converting a bridge response characteristic of the amplified analog signal into a digital signal;
A vehicle information DB storing vehicle classification information, vehicle model information, body information, and axle arrangement information;
The axle detection, axle number, inter-axle distance and traveling speed of the traveling vehicle are calculated using the bridge response characteristic of the vertical reinforcement strain gauge, and the load response of the running vehicle is determined using the bridge response characteristic of the housing the strain gauge. A vehicle weight calculation unit for obtaining a gross weight; And
Overload determination unit for determining whether the weight and gross weight of the traveling vehicle exceeds the allowable standard
Vehicle weight measurement system using the bridge response characteristics comprising a. The method of claim 3,
The vehicle weight calculation unit, the bearing (

), The distance between axes (

Strain influence line due to the unit load of the housing head previously obtained by the test vehicle knowing

) And a vehicle weight measurement system using a bridge response characteristic, by combining the load-to-axis and side-to-side distances of the vehicle to be measured and optimizing it in a direction in which an error with the actual value of the housing strain of the vehicle to be measured is minimized. The method of claim 3,
The vehicle weight calculation unit may be configured to calculate the total weight of the driving vehicle based only on the variation of the live load strain by separating the response due to the temperature deformation and the response due to the live load, for the measurement result including the live load strain and the temperature strain. Vehicle weight measurement system using the bridge response characteristics. The method of claim 3,
The vehicle weight calculation unit, the vehicle weight measurement system using the bridge response characteristics, characterized in that the trigger (Trigger) function is set to operate only for the strain that the maximum strain of the housing the center portion generated when traveling on the bridge over a certain size is set. The method of claim 1,
And the overload vehicle control unit is a camera installed at a predetermined height of the bridge to photograph the vehicle number of the overload vehicle. In the vehicle weight measurement method for measuring the weight of the traveling vehicle passing through the bridge to control the overload,
a) measuring the bridge response characteristics (strain) by the strainer gauge installed in the housing and the strain gauge of the vertical reinforcement installed in the vertical reinforcement when the vehicle to be measured passes the bridge;
b) calculating axle detection, number of axles, distance between axles and traveling speed of the vehicle to be measured by using the bridge response characteristics by the vertical reinforcement strain gauge;
c) separating the passing vehicle according to the vehicle type discrimination algorithm;
d) optimizing in a direction in which the error of the residential strain is minimized;
e) calculating the weight and total weight of the vehicle to be measured; And
f) determining the overload vehicle by comparing whether the weight of the vehicle to be measured and the gross weight exceed an allowable standard;
Vehicle weight measurement method using the bridge response characteristics comprising a. The method of claim 8,
g) vehicle weight using the bridge response characteristic, further comprising the step of transmitting the overload vehicle information by recognizing the vehicle number of the overload vehicle when the load and gross weight of the vehicle under measurement are determined to be an overload vehicle exceeding an allowable standard; Measurement method. The method of claim 8,
The d) step, the accumulation (

), The distance between axes (

Strain influence line due to the unit load of the housing head previously obtained by the test vehicle knowing

) And a vehicle load and a distance between the shafts of the vehicle under measurement to optimize the direction in which the error of the housing strain of the vehicle under measurement is minimized from the measured value.

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