KR102130669B1 - Response system and method to secure running vehicles on a bridge against strong wind - Google Patents

Abstract

The present invention relates to a system for securing driving safety of a vehicle on a bridge when a strong wind blows, and to a method for securing driving safety of a vehicle using the same. The system calculates the wind speed at the risk of causing a vehicle accident in consideration of the type of vehicle, driving lane, a section in which the driving is driving on the bridge, the wind direction, the wind speed, the driving speed of the vehicle, and the like in order to prevent accidents such as overturning and path departure of the vehicle driving on the bridge when a strong wind blows and secure the driving safety, so that necessary countermeasures such as lowering the speed limit which can allow the vehicle to drive or limiting the driving of the vehicle can be quickly and appropriately taken.

Description

Response system and method to secure running vehicles on a bridge against strong wind}

The present invention relates to a system and a method for securing driving safety of a vehicle driving on a bridge when a strong wind blows, specifically, a vehicle accident such as rollover or departure from a vehicle driving a bridge when a strong wind blows In order to prevent and prevent driving safety in advance, consider the type of vehicle, the driving lane, the section where the vehicle travels on the bridge, the wind direction, the wind speed, and the driving speed of the vehicle. By calculating, based on this, it is possible to rapidly and appropriately perform necessary countermeasures in real time, such as adjusting the speed that can allow the vehicle to be driven down or limiting the vehicle itself. It is related to "a system for securing driving safety and a method for securing driving safety".

Vehicles passing over a bridge in a strong wind are a significant risk. In order to prevent a danger from occurring in a vehicle driving a bridge due to the strong wind situation, an appropriate response is required.

In such a strong wind situation, the response that has been taken in the past is limited to the fact that the area where the strong wind is blowing is generally indicated on a traffic sign such as an electric signboard, or a structure such as a windshield on a bridge as disclosed in Korean Patent Registration No. 10-2007296. Installation is just to reduce the wind. Recently, it has been proposed to set a wind speed that allows a vehicle to pass through, based on this, by performing only a dynamic analysis of the movement of the vehicle, and to notify the driver of the vehicle through a traffic sign, etc. However, this conventional method has a limitation that it can be applied only on a general road existing on the ground, not a bridge. In the case of a bridge, the distribution of wind speed on the road above the bridge can be judged by the shape of the girder, which may require the application of a traffic limit wind speed much lower or higher than that of a general road. Because it does not. For example, in the case of a long bridge, it is judged that the wind direction in the right angle direction of the bridge is the most dangerous, and the bridge is designed based on this. However, in the case of a vehicle, unlike a bridge, it does not stop and moves at its own speed, resulting in additional wind loads, which may cause the most dangerous situation in the wind in the other direction, not in the wind blowing at the right angle to the shaft. . Although the driving speed of a vehicle that can increase the risk of a vehicle accident differs according to the relationship between the driving direction of the vehicle passing over the bridge and the wind direction in which the wind actually blows from the bridge, the conventional method takes this into consideration. There is a limit that it cannot sufficiently guarantee the driving safety of a vehicle in a strong wind situation.

Republic of Korea Patent Registration No. 10-2007296 (2019. 08. 06. announcement).

The present invention was developed to overcome the limitations of the prior art as described above, in order to prevent a case in which it is difficult to guarantee stability of a vehicle driving a bridge due to strong wind, according to the specifications of the bridge and the wind environment such as wind direction and wind speed By taking appropriate measures to enable the vehicle to safely drive the bridge, it prevents the occurrence of vehicle accidents such as the rollover of the vehicle driving the bridge when the strong wind blows, or the departure of the route, and ensures driving safety. It aims to provide a technology that can.

In particular, the present invention is based on a sufficient engineering basis in consideration of the wind environment in the area where the bridge is located, the change in the wind load received by the vehicle by the cross section, and the dynamic characteristics of each vehicle, and quickly and appropriately deriving the limited wind speed in real time. It is an object of the present invention to provide a method and a system capable of securing driving stability.

In order to achieve the above problems, in the present invention, the wind direction appearance frequency calculation module (1) for each direction to derive the frequency of the wind direction by direction from the long-term wind speed data for the target bridge; A main wind direction selection module (2) for selecting the wind direction with the most frequent frequency from the derived wind direction appearance frequency by direction; A review section selection module (3) for dividing a target bridge into a plurality of sections according to a predetermined number, and selecting a review section for reviewing vehicle driving safety among the divided sections; An aerodynamic force coefficient calculating module (4) for calculating a vehicle aerodynamic force coefficient according to a lane existing in the examining section, a vehicle passing through the examining section, and a wind direction for each of the examining sections of the target bridge; For each review section of the target bridge, the dangerous wind speed for each vehicle type, the dangerous wind speed for each lane, and the dangerous wind speed for each wind direction corresponding to the lowest wind speed that causes a vehicle accident are respectively derived, and the minimum value of the derived wind speed for each wind direction is calculated and limited. Limiting wind speed deriving module 5 for deriving by wind speed; A wind speed wind direction measurement sensor (6) installed in a review section of the target bridge to measure wind speed and wind direction in real time at predetermined time intervals; And based on the wind speed and wind direction measured and transmitted by the wind speed measurement sensor 6, it is determined whether the limited wind speed obtained from the dangerous wind speed for each wind direction is generated, and if the measured wind speed is determined to be equal to or greater than the wind speed, the corresponding lane is determined. A system for securing driving safety of a vehicle on a bridge during a strong wind is provided, comprising a response command module (7) for issuing a response action command for lowering a speed limit of a corresponding vehicle to be driven.

In addition, in the present invention, in order to achieve the above object, the direction of wind direction appearance frequency for each target bridge for deriving the driving safety of the vehicle is derived by the wind direction appearance frequency calculation module 1 for each direction. step; In the main wind direction selection module (2), selecting a wind direction that has the most frequent frequency among the wind frequencies in each direction as the main wind direction; The step of dividing the target bridge into a plurality of sections according to the predetermined number of sections, and selecting the review section to be examined for vehicle driving safety among the divided sections by the operation of the review section selection module 3 ; Calculating, by the air force coefficient calculating module 4, a vehicle air force coefficient according to a lane existing in the review section, a vehicle passing through the review section, and a wind direction for each review section of the target bridge; By operating the limiting wind speed derivation module 5, for each review section of the target bridge, the dangerous wind speed corresponding to the lowest wind speed that causes the vehicle accident is derived according to the vehicle type, lane, and wind direction, and each derived wind direction is determined. Calculating a minimum value among dangerous wind speeds and deriving the limit wind speed; And determining whether or not a limiting wind speed obtained from a dangerous wind speed for each wind direction is generated based on the transmitted wind speed and wind direction measured in real time every time interval determined by the wind speed wind direction sensor installed in the review section of the target bridge. , If it is determined that the measured wind speed is higher than the limit wind speed, a method for securing the driving safety of the vehicle on the bridge during strong wind is provided, comprising the step of issuing a countermeasure command to lower the speed limit of the corresponding vehicle to drive the lane. do.

In the present invention, in consideration of the fact that the driving speed of a vehicle that can increase the risk of a vehicle accident differs depending on the relationship between the driving direction of the vehicle passing over the bridge and the wind direction in which the wind actually blows from the bridge, the area where the bridge is located Considering the wind environment, the change in wind load received by the vehicle by the cross section of the bridge, and the dynamic characteristics of each vehicle, the wind blowing over the bridge according to the vehicle type, driving lane, driving section, and driving speed of the vehicle driving the bridge It calculates the dangerous wind speed for various wind directions of the vehicle and derives the speed limit for each vehicle based on this, and in accordance with the speed limit, it is possible to quickly take necessary countermeasures in real time, such as reducing vehicle traffic speed and restricting vehicle traffic. .

Accordingly, according to the present invention, a customized strong wind response operation strategy considering the cross-sectional shape of the bridge, road conditions, and the wind environment of the site can be constructed, and the vehicle type, driving lane, and driving section of the vehicle driving the bridge when the actual strong wind blows. It is possible to respond to danger according to the driving speed of the vehicle, and through this, it is possible to appropriately and specifically reduce the risk of vehicle accidents on the bridge during a strong wind for each target bridge. That is, according to the present invention, according to the specifications of the bridge and the wind environment such as wind direction and wind speed, it is possible to take an appropriate response to allow the vehicle to safely drive the bridge, and accordingly, the vehicle driving the bridge when the strong wind blows It will be possible to prevent vehicle accidents such as rollover and departure from the vehicle in advance and ensure driving safety.

1 is a schematic block diagram showing the configuration of a vehicle driving safety securing system according to the present invention.
2 is a schematic flowchart of an overall process of a method for securing vehicle driving safety according to the present invention.
Figure 3 is a schematic flow chart showing a specific process for deriving the dangerous wind speed for each direction in the wind speed limiting module of the present invention.
4 and 5 are graphs showing an example of a dangerous wind speed graph for each wind direction, which graphically represents a dangerous wind speed for each wind direction.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited. In particular, the same reference numerals in the present disclosure, including the claims, refer to the same components. In describing the embodiments of the present invention, detailed descriptions of known functions or configurations may be omitted. Combinations of each block in the accompanying block diagrams and steps of the flow charts may be performed by computer program instructions (execution engines), which are executed by a general purpose computer, special purpose computer, or other programmable data processing equipment processor. Since it can be mounted, the instructions executed through a processor of a computer or other programmable data processing equipment create a means to perform the functions described in each block of the block diagram or in each step of the flowchart. These computer program instructions can also be stored in computer readable or computer readable memory that can be oriented to a computer or other programmable data processing equipment to implement functionality in a particular way, so that computer readable or computer readable memory The instructions stored in it are also possible to produce an article of manufacture containing instructions means for performing the functions described in each block of the block diagram or in each step of the flowchart. And since computer program instructions may be mounted on a computer or other programmable data processing equipment, a series of operation steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer to generate a computer or other programmable It is also possible for instructions to perform data processing equipment to provide steps for executing the functions described in each block of the block diagram and in each step of the flowchart. In addition, each block or each step can represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical functions, and in some alternative embodiments referred to in blocks or steps It is also possible that the functions that were created occur out of sequence. For example, two blocks or steps shown in succession may in fact be executed substantially simultaneously, and it is also possible that the blocks or steps are performed in the reverse order of the corresponding function as necessary. In particular, as used herein,'… module', '… unit', '… Wealth','… The term'ki' means a unit that processes at least one function or operation, which is hardware or software composed of various known elements or mechanical elements such as electronic circuits, integrated circuits, and application specific integrated circuits (ASICs). Or it may be implemented by a combination of hardware and software.

1 is a schematic block diagram showing a configuration of a system 100 for securing driving safety of a vehicle on a bridge during a strong wind according to the present invention, and FIG. 2 is a present invention using the vehicle driving safety securing system 100 described above. A schematic flow chart of the overall process of the vehicle driving safety securing method is shown. As shown in the figure, the vehicle driving safety securing system 100 of the present invention includes a direction wind direction appearance calculation module (1), a main wind direction selection module (2), a review section selection module (3), and an air force coefficient calculation module (4). ), limit wind speed derivation module (5), wind speed wind direction sensor (6) and a corresponding command module (7). Hereinafter, with reference to FIGS. 1 and 2, each module of the vehicle driving safety securing system 100 according to the present invention and each process of the vehicle driving safety securing method according to the present invention will be described in detail.

The vehicle driving safety securing system 100 of the present invention is provided with a wind direction appearance frequency calculation module 1 for each direction. In the direction of wind direction occurrence frequency calculation module 1 for each direction, the wind direction by direction is shown from the data collected by measuring wind speed and wind direction for a long time (for example, over 5 years) for the target bridge ("long-term wind speed data"). Frequency> is derived (step 1). The frequency of wind direction by direction means the number of cases where the wind blows in each direction (wind direction) in which the wind blows. The administrator can subdivide the wind direction in a plurality of directions in advance, and in the direction of wind direction frequency calculation module 1 for each direction, the number of cases where the wind corresponding to each of the subdivided wind directions is blown is extracted from the long-term wind direction data. The frequency of star wind direction can be derived. The wind direction appearance frequency calculation module 1 for each direction may have a database of long-term wind speed wind direction data itself, but the wind direction appearance calculation module 1 for each direction has a communication function, so that the long-term wind speed direction from an external observer or the like is provided. Data may be transmitted.

The main wind direction selection module 2 selects the wind direction with the highest frequency of occurrence as the <main wind direction> using the wind direction appearance frequency of each direction derived by the wind direction appearance frequency calculation module 1 for each direction (step) 2). At this time, if necessary, the main wind direction selection module 2 can create a “wind rose” that analyzes the wind direction and wind speed grade by direction for a certain period of time at a certain observation point and forms a radial shape. It is also possible to intuitively grasp the main wind direction using. At this time, the main wind direction selection module 2 may derive the <wind frequency class by wind direction> in order to create a wind rose. The manager can be classified into a plurality of grades (classes) according to the degree of wind speed. In the main wind direction selection module (2), the wind blown into each of the subdivided wind directions is obtained from a pre-determined rank. By classifying accordingly, it is possible to derive the frequency of the wind speed class for each wind direction by extracting the number of cases in which the wind corresponding to each class has been blown, and use it for the preparation of the wind rose.

In the present invention, the target bridge is divided into a plurality of sections having a predetermined length in the throttle direction, and for each section, the angle between the main wind direction and the vehicle driving direction is calculated. The manager decides in advance how many sections to divide the target bridge that knows the specifications such as the total length of the axis direction, and the selection section 3 of the review section selects the target bridge according to the number of sections determined in advance. It is divided into a plurality of sections, and calculates an angle between the vehicle driving direction determined for each section and the main wind direction selected by the main wind direction selection module 2. Also, in the review section selection module 3, when the angle between the main wind direction and the vehicle driving direction is calculated for each section, when the calculated angle value is within a preset angle range (for example, 30 to 60 degrees) In this case, the relevant section is selected as <Review Section> (step 3).

If necessary, a section with a greater risk of accidents may be added to the review section. The main span of the bridge can be included in the review section, but it can also be a <review section> even if it is a target with high risk of accidents, such as when there is a lateral gradient or a multi-layer bridge. Therefore, the manager may directly input the section with high risk of accident as the review section as above, or set it as the target of the review section in advance, so that the review section selection module 3 may include this and select the review section.

After the review section of the target bridge is selected, the <vehicle aerodynamic coefficient> is calculated for the vehicle driving the review section for each review section (step 4). Based on the wind tunnel experiment in the laboratory or the known CFD (Computational Fluid Dynamics) analysis, the aerodynamic force coefficient calculation module 4 calculates the <vehicle aerodynamic force coefficient> for the vehicle driving the review section of the target bridge. The wind force acting on the vehicle depends on the angle of incidence of the wind, the lane in which the vehicle is located, and the vehicle model. Therefore, for each of the review sections, the vehicle air force coefficient is calculated for all lanes existing in the review section, the type of vehicle passing through the review section, and all the previously classified wind directions. That is, in the case of the number of one-way lanes existing in the examination section of the target bridge, the number of vehicle types driving the examination section, and the number of subdivided wind directions, the vehicle aerodynamic coefficient is calculated for each. The calculation of the vehicle air force coefficient is performed for each of the review sections. For example, the one-way lane existing in the review section of the target bridge is three lanes, five types of vehicles traveling in the review section, and 16 wind directions (N, NNE, NE, ENE, E, ESE, SE Assuming subdivision into, SSE, S, SSW, SW, WSW, W, WNW, NW, NNW), calculate the vehicle aerodynamic coefficient for each of 240 cases (= 3 lanes ㅧ 5 models ㅧ 16 wind directions) If there are 5 review periods, the vehicle air force coefficient calculation is performed for all 5 review periods.

), 차량의 횡력 계수(

), 차량의 양력 계수(

), 차량의 롤링(rolling) 모멘트 계수(

), 차량의 피칭(pitching) 모멘트 계수(

) 및 차량의 요잉(yawing) 모멘트 계수(

)가 포함된다. 충분한 레이놀즈 수(Reynolds number)가 확보된다면 차량 공기력 계수는 풍속에 크게 좌우되지 않으므로, 관리자가 미리 풍속을 정하여 차량 모형을 이용한 풍동실험을 수행하거나 또는 공지(公知)된 CFD 분석 기법을 이용함으로써 차량 공기력 계수를 산출할 수 있다. In the vehicle aerodynamic coefficient, the drag coefficient of the vehicle (

), the lateral force coefficient of the vehicle (

), the lift coefficient of the vehicle (

), the rolling moment coefficient of the vehicle (

), the pitching moment coefficient of the vehicle (

) And the yawing moment coefficient of the vehicle (

) Is included. If a sufficient Reynolds number is secured, the vehicle aerodynamic coefficient does not greatly depend on the wind speed, so the administrator determines the wind speed in advance and performs wind tunnel experiments using the vehicle model or uses a known CFD analysis technique. Coefficients can be calculated.

When performing the wind tunnel test, the wind tunnel test results are directly input to the air force coefficient calculation module 4 by the administrator, or the wind tunnel test results are transmitted from the tester used for the wind tunnel test to the air force coefficient calculation module 4, and the air force coefficient calculation is performed. The module 4 calculates a vehicle air force coefficient for a vehicle traveling on a review section of a target bridge by performing the calculation according to the method described above. Of course, the air force coefficient calculation module 4 may also calculate the vehicle air force coefficient using a CFD analysis technique.

In the limiting wind speed derivation module 5, for each of the review section of the target bridge, the <dangerous wind speed> according to all vehicle types, lanes, and subdivided wind directions is previously derived (step 5), and the derived dangerous wind speed is DB It is made of.

Vehicle accidents caused by strong winds can be largely classified into "vehicle rollover accidents" and "route accidents." Dangerous wind speed is the smallest of wind speed values that cause one or more vehicle accidents, that is, vehicle rollover accidents or route departure accidents. It means the lowest wind speed value. The dangerous wind velocity depends on the angle of incidence of the blowing wind, that is, the wind direction. Therefore, the dangerous wind speed is actually <dangerous wind speed by wind direction>. That is, there are dangerous wind speeds for each wind direction, such as a dangerous wind speed in the N direction (north direction) and a dangerous wind speed in the NW direction (north west direction). The dangerous wind speed for each wind direction varies depending on the type of vehicle and the lane driving the review section of the target bridge, and thus the dangerous wind speed for each wind direction is derived while the vehicle type and the lane are different. The calculation and derivation of the dangerous wind speed for each wind direction and the limit wind speed, which will be described later, are performed by the limit wind speed derivation module 5.

3 is a schematic flow chart showing a specific process of deriving the dangerous wind speed for each wind direction from the limiting wind speed derivation module 5. In order to calculate the dangerous wind speed, the speed of the vehicle traveling in the examination section is first set. For example, the maximum speed of the bridge or 50% of the maximum speed of the bridge can be set as the vehicle speed. The speed of the vehicle for calculating the dangerous wind speed is transmitted to the limit wind speed derivation module 5 by input to the manager. The limiting wind speed derivation module 5 calculates <reaction force of the vehicle wheel> and <displacement of the vehicle> for the vehicle driving the review section using the set vehicle speed and the vehicle air force coefficient derived in the previous step ( Step 5-1). The reaction force of the vehicle wheel and the displacement of the vehicle are calculated using the set vehicle speed and the vehicle air force coefficient derived in the previous step. The reaction force of the vehicle wheel and the displacement of the vehicle varies depending on the wind speed and the wind speed at which a dangerous situation occurs Is to be found as a dangerous wind speed, the limit wind speed derivation module 5 calculates the reaction force of the vehicle wheel and the displacement of the vehicle while changing the wind speed. When performing the calculation while changing the wind speed, it is possible to generate and use the "wind speed history over time". In generating the wind speed history over time, a known Von Karman Spectrum can be utilized. Analysis is performed by inputting the specifications of the vehicle weight and road linear conditions such as superelevation slope and curvature to the limit wind speed derivation module 5, and calculating the reaction force of the vehicle wheels and displacement of the vehicle. The dynamic vehicle analysis method or quasi-static vehicle analysis method can be used. The details of the dynamic vehicle analysis method or the quasi-static vehicle analysis method used to calculate the reaction force of the vehicle wheel and the displacement of the vehicle are known, and detailed descriptions thereof will be omitted.

In the limiting wind speed derivation module 5, it is determined whether or not the risk situation is applicable in comparison with the previously set risk determination criteria for each value of the calculated vehicle wheel reaction force and vehicle displacement (step 5-2). That is, it is determined whether the calculated reaction force of the wheels of the vehicle corresponds to the reaction force set as the criterion for risk determination, and whether the calculated displacement of the vehicle corresponds to the displacement set as the criterion for danger determination. For example, if the vertical reaction force value 0(zero) acting on one or more wheels is set as a risk judgment criterion for a vehicle rollover accident, if the vertical reaction force acting on one or more wheels becomes 0, it can be regarded as a vehicle rollover accident. have. In addition, the horizontal movement distance or rotational angle of the vehicle's center of gravity can be set as a criterion for risk assessment of a path departure accident.For example, when performing dynamic vehicle analysis to calculate the reaction force and displacement of a vehicle wheel, the vehicle's weight If the center is horizontally moved more than 0.5m or rotated by 0.2 radian, it can be regarded as an out-of-path accident. In addition, when one of two situations, a vehicle overturning accident and a vehicle out-of-rove accident, occurs, it can be determined as a "risk situation". The above numbers are examples, and if necessary, different values can be set for each criterion. In the case of using the quasi-static vehicle analysis method, the case where one or more axle frictional forces have reached the maximum stop frictional force level may be regarded as a deviating accident.

In the limit wind speed derivation module 5, when it is judged as "dangerous situation", the wind speed at that time is determined when the wind in a specific direction blows to the vehicle driving the lane at the set speed at the review section of the target bridge. It is classified as <dangerous wind speed candidate> (step 5-3). The limiting wind speed derivation module 5 determines whether each wind speed corresponds to a dangerous wind speed candidate by repeating the above process while changing the wind speed, and classifies the smallest value among the classified dangerous wind speed candidates. It is regarded as &quot;dangerous wind speed" when the wind in a specific direction blows to the corresponding vehicle driving in the corresponding lane (step 5-4).

In the limited wind speed derivation module 5, the process of deriving the <dangerous wind speed> as described above for each subdivided wind direction, that is, calculating the reaction force of the vehicle wheels and displacement of the vehicle, determining whether the situation is dangerous, and calculating the lowest value among the dangerous wind speed candidates By repeating and deriving the dangerous wind speed for each wind direction, it presents the <dangerous wind speed for each wind direction>.

If the above is described in more detail by exemplifying the case where the truck runs on the first lane of the review section and winds in the N direction, the vehicle air force coefficient is first calculated through a wind tunnel test, etc., as described above. Then, the reaction force of the vehicle wheel and the displacement of the vehicle are calculated using the preset vehicle speed and the calculated vehicle air force coefficient, but <reaction force of the vehicle wheel> and <displacement of the vehicle> are calculated while changing the wind speed. The calculated reaction forces of the vehicle wheels and the displacements of the vehicles include the reaction forces acting on the wheels of the vehicle when the truck runs one lane and winds in the N direction at the preset vehicle speed, and the displacements generated on the vehicle. do. When the reaction force of the vehicle wheels and the displacement of the vehicle are calculated for each different wind speed, the calculated values are compared with the risk judgment criteria to determine whether the situation is dangerous, and when it is determined to be a "risk situation" The wind speed is classified as a <dangerous wind speed candidate>, and the smallest value among the classified dangerous wind speed candidates is <dangerous wind speed>, that is, when a truck drives the first lane of the target bridge blowing in the N direction at a set speed. <dangerous wind speed>. Then, by repeatedly performing the above process with different wind directions, a “dangerous wind speed for each wind direction” is derived for a situation in which the truck travels at the set speed at the first lane of the target bridge.

On the other hand, since the dangerous wind speed varies depending on the vehicle model and the lane, in the limited wind speed derivation module 5, the above-described process is repeated for each lane of the target bridge review section with a specific vehicle model, and the "dangerous wind speed for each wind direction according to the vehicle model" is selected. It is possible to derive the lane, and the above-described process may be repeated for each vehicle type to derive "dangerous wind velocity for each wind direction according to the lane". Furthermore, when calculating the dangerous wind speed, the manager sets the speed of the vehicle. When the speed of the vehicle is changed in the limiting wind speed derivation module 5, the above process is repeatedly performed. Wind speed” may be derived.

4 and 5 is a graph showing a dangerous wind speed for each wind direction, that is, a graph showing an example of a "Critical Wind Speed Curve/CWC" for each wind direction. In the wind speed graph, the horizontal axis represents the wind direction, and the vertical axis represents the value of the dangerous wind speed calculated for each wind direction, that is, the dangerous wind speed for each wind direction.The dangerous wind speed graph for each wind direction in FIGS. 4 and 5 is general in the review section of the target bridge. As for the case where the truck is traveling in three lanes, the dangerous wind speed graph in FIG. 4 is when the speed of the vehicle is set to the legal speed limit of 70 km/h, and the dangerous wind speed graph in FIG. 5 is 40 km/ for the vehicle speed. This is the case when set to h.

In the limiting wind speed derivation module 5, after deriving the dangerous speed for each wind direction, the <restricted wind speed> is derived and determined using this (step 6). When a wind with a wind speed greater than the limit wind speed is blown, it is considered that a proper response is required, and a pre-set response action is taken. In other words, <restricted wind speed> means the wind speed at which countermeasures are to be taken.

In the present invention, <restricted wind speed> is defined as the lowest value among the dangerous wind speeds for each wind direction. Referring to FIG. 4, which graphically illustrates the dangerous speed for each wind direction when the vehicle speed is 70 km/h, the dangerous wind speed in the wind direction of the NE (northeast wind) in FIG. 4 is 47 m/s. In other words, if the general truck is traveling at 70 km/h in three lanes and the wind blows at least 47 m/s in the NE direction, it is a dangerous situation. However, even if only winds of 18.5 m/s or more blow in the W direction (west), they are in danger. In consideration of such circumstances, the limiting wind speed derivation module 5 sets the minimum value among the dangerous wind speeds for each wind direction as the limit wind speed. In the case of FIG. 4 described above, 18.5 m/s is set as the limit wind speed. When winds with wind speeds greater than the limit wind speed are blown, predetermined measures are taken.

On the other hand, wind speed and wind direction are measured in real time at predetermined time intervals through the wind speed wind direction measurement sensor 6 installed in the review section of the target bridge. The wind speed and wind direction measured by the wind speed wind direction measurement sensor 6 are transmitted to the corresponding command module 7, and in the corresponding command module 7, the limited wind speed obtained by the dangerous wind speed for each wind direction is determined based on the measured wind speed and wind direction. It is determined whether or not it has occurred (step 8). When it is determined that the measured wind speed is higher than the limited wind speed, it is necessary to slow down the speed of the corresponding vehicle to travel in the corresponding lane, and countermeasures are taken to lower the limit of the speed at which the corresponding vehicle in the lane can travel.

In the case shown in FIG. 5 above, 22.2 m/s is set as the limiting wind speed. This is because the dangerous wind speed is 22.2 m/s when the wind direction (west wind) of W in FIG. 5 is the lowest value. In comparison with the case shown in FIG. 4, when the vehicle speed decreases from 70 km/h to 40 km/h, the limit wind speed increases from 18.5 m/s to 22.2 m/s. If the wind speed of 19m/s is blowing in the W direction, the vehicle is placed in danger when the speed of the vehicle is 70km/h, but if the speed of the vehicle is 40km/h, the same wind speed and wind (wind speed of 19m/s in the W direction) Even in the blowing wind) will not be in danger.

When the speed of the vehicle is reduced as described above, the limited wind speed rises. Therefore, it is necessary to take countermeasures to lower the limit of the vehicle speed that can allow driving to make the measured wind speed smaller than the limited wind speed. As a countermeasure to reduce the vehicle speed, a method to notify the vehicle of a possible speed, that is, the speed limit of the vehicle has been lowered in various ways such as a visual method (displaying an electric sign) or an audible method (alarm sound). There is, if necessary, a method of physically blocking the passage of the vehicle itself may be used. Therefore, when it is determined that the measured wind speed is equal to or higher than the limited wind speed, the response command module 7 issues a response action execution command (“response command”) and transmits it to the management entity or a device for the response action (step 9). The management subject or the like who has received a response command from the response action module 7 takes appropriate action.

As described above, in the present invention, a bridge is considered in consideration of the fact that the driving speed of a vehicle that can increase the risk of a vehicle accident differs depending on the relationship between the driving direction of the vehicle passing over the bridge and the wind direction in which the wind actually blows from the bridge. Consider the wind environment in this area, the change in wind load received by the vehicle by the cross section of the bridge, and the dynamic characteristics of each vehicle.However, according to the vehicle type, driving lane, driving section, and driving speed of the vehicle driving the bridge, Calculate the dangerous wind speed for the various wind directions of the blowing wind, and derive the speed limit for each vehicle based on this, and in accordance with these speed limits, take necessary measures such as reducing vehicle traffic speed and limiting vehicle traffic in real time. You can take it. Accordingly, according to the present invention, when a strong wind blows, it is possible to effectively prevent in advance a vehicle accident such as a rollover of a vehicle traveling on a bridge, a departure from the route, and to ensure driving safety.

1: Module for calculating the frequency of appearance of wind direction by bearing
2: Main wind direction selection module
3: Selection module for the review section
4: Air force coefficient calculation module
5: Limit wind speed derivation module
6: Wind speed wind direction sensor
7: Response command module
100: vehicle driving safety securing system

Claims (8)

A direction wind direction appearance frequency calculation module for deriving a frequency direction of wind direction for each target bridge;
A main wind direction selection module that selects the wind direction with the most frequent frequency from the derived wind direction appearance frequency by direction;
A review section selection module for dividing a target bridge into a plurality of sections and selecting a review section therefrom;
An air force coefficient calculation module for calculating a vehicle air force coefficient according to a lane, a vehicle type, and a wind direction for each of the review sections;
A limit wind speed derivation module for deriving a dangerous wind speed for each wind direction by using the calculated vehicle air force coefficient for each of the review sections, and calculating a minimum value among the derived wind speeds for each wind direction to derive as the limit wind speed;
A wind speed wind direction sensor installed in a review section of the target bridge to measure wind speed and wind direction in real time at predetermined time intervals; And
Based on the measured wind speed and wind direction, it is determined whether or not the limit wind speed has occurred, and if it is determined that the measured wind speed is higher than the limit wind speed, a response command to issue a response action command to lower the speed limit of the vehicle to drive the lane. A system for securing driving safety of a vehicle on a bridge in a strong wind, characterized in that it comprises a module. According to claim 1,
In the main wind direction selection module,
The wind blowing in each wind direction is classified according to a plurality of pre-set ranks according to the degree of wind speed,
The number of cases where the wind corresponding to each class is blown is extracted from the long-term wind speed data,
Deriving the frequency of wind speed class by wind direction,
A system for securing driving safety of a vehicle on a bridge during a strong wind, characterized in that a wind rose is created using the derived wind speed class frequency for each wind direction, and the main wind direction is selected from the wind rose. The method according to claim 1 or 2,
In the selection section of the review section,
For each divided section, an angle between a preset vehicle driving direction and a main wind direction is calculated,
When the calculated angle value is within a preset angle range, the corresponding section is selected as a review section. The method according to claim 1 or 2,
In the limited wind speed derivation module, for each wind direction,
Calculating the reaction force of the vehicle wheel and the displacement of the vehicle while changing the wind speed with respect to the vehicle driving the review section, using the preset vehicle speed and the calculated vehicle air force coefficient;
Determine whether or not the risk situation corresponds to the reaction force and displacement according to the previously determined risk determination criteria for each of the calculated reaction force and displacement of the vehicle wheel;
If it is judged to be a dangerous situation, the wind speed at that time is classified as a dangerous wind speed candidate when the wind in a specific direction is blown to the corresponding vehicle driving the lane at the set speed, and the review section of the target bridge is classified as the most dangerous wind speed candidate. A vehicle on a bridge during a strong wind characterized by deriving a dangerous wind speed and presenting it as a dangerous wind speed for each wind direction by repeating a process in which a small value is regarded as a dangerous wind speed when the wind in a specific direction blows to the corresponding vehicle driving in the corresponding lane. System for securing driving safety. Deriving the frequency of appearance of the wind direction for each target bridge for securing the driving safety of the vehicle;
Selecting a wind direction having the most frequent frequency among the derived wind directions by direction as the main wind direction;
Dividing the target bridge into a plurality of sections and selecting a review section therefrom;
Calculating a vehicle air force coefficient according to a lane, a vehicle type, and a wind direction for each review section;
Deriving a dangerous wind speed for each wind direction using the calculated vehicle air force coefficient for each of the review sections, and calculating a minimum value among the derived wind speeds for each wind direction to derive as a limited wind speed; And
In the review section, it is determined whether or not the limit wind speed is generated based on the transmitted wind speed and wind direction measured in real time at predetermined time intervals, and if it is determined that the measured wind speed is higher than the limit wind speed, the vehicle to drive the lane And issuing a countermeasure command to lower the speed limit of the vehicle. The method of claim 5,
In the main wind direction selection stage,
The wind blowing in each wind direction is classified according to a plurality of pre-set ranks according to the degree of wind speed,
The number of cases where the wind corresponding to each class is blown is extracted from the long-term wind speed data,
Deriving the frequency of wind speed class by wind direction,
A method of securing driving safety of a vehicle on a bridge in a strong wind, characterized in that a wind rose is created using the derived wind speed class frequency for each wind direction, and the main wind direction is selected from the wind rose. The method of claim 5 or 6,
In the selection phase of the review section,
For each divided section, an angle between a predetermined vehicle driving direction and a main wind direction is calculated,
A method for securing driving safety of a vehicle on a bridge during a strong wind, characterized in that the selected section is selected as a review section when the calculated angle value is within a preset angle range. The method of claim 5 or 6,
In the step of deriving the wind speed, for each wind direction,
Calculating the reaction force of the vehicle wheel and the displacement of the vehicle while changing the wind speed with respect to the vehicle driving the review section, using the preset vehicle speed and the calculated vehicle air force coefficient;
Judging whether the calculated reaction forces and displacements of the vehicle wheels correspond to the risk situations in preparation for the reaction forces and displacements according to the predetermined risk determination criteria; And
If it is judged to be a dangerous situation, the wind speed at that time is classified as a dangerous wind speed candidate when the wind in a specific direction is blown to the corresponding vehicle driving the lane at the set speed, and the review section of the target bridge is classified as the most dangerous wind speed candidate. A vehicle on a bridge during a strong wind characterized by deriving a dangerous wind speed and presenting it as a dangerous wind speed for each wind direction by repeating the step of counting a small value as a dangerous wind speed when the wind in a specific direction blows to the corresponding vehicle driving the corresponding lane. How to secure driving safety.

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