CN113338189B - Typhoon-resistant traffic sign control method based on intelligent lifting system - Google Patents
Typhoon-resistant traffic sign control method based on intelligent lifting system Download PDFInfo
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- CN113338189B CN113338189B CN202110543352.1A CN202110543352A CN113338189B CN 113338189 B CN113338189 B CN 113338189B CN 202110543352 A CN202110543352 A CN 202110543352A CN 113338189 B CN113338189 B CN 113338189B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
- E01F9/65—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection with rotatable, swingable or adjustable signs or signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/02—Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover or wind speed
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention provides an anti-typhoon traffic sign control method based on an intelligent lifting system. The invention arranges a wireless transmission module, a controller, a meteorological sensor and a transmission module at the traffic sign position. Firstly, the state of the expressway is judged by receiving information of an expressway management center, and then preliminary optimization control is carried out on the signboards. And acquiring real-time wind speed and wind direction data, and optimizing the angle and the height of the signpost by using the height of the signpost as an optimization target according to stability constraint such as maximum normal stress and visual constraint conditions such as the rotation angle of the signpost and the like through a simplex algorithm. And finally, controlling the motor to rotate by taking the optimized height and angle as targets, and driving the signpost to correspondingly lift and rotate. The invention has the advantages that on the basis of considering the functionality of the signpost, the regulation is carried out according to the real-time wind speed and wind direction data, the stability is ensured, the good visibility is provided, and the road safety level is effectively improved.
Description
Technical Field
The invention belongs to the field of intelligent traffic, and particularly relates to an anti-typhoon traffic sign control method based on an intelligent lifting system.
Background
In recent years, as global climate is required to be warmed, severe climate is increased, and the southeast coastal area of China is greatly influenced by typhoon weather. The traffic sign design is designed according to static wind pressure, and the wind pressure of typhoons is far higher than a design value, so that the traffic sign is damaged, the traffic sign cannot be visually recognized, driving behavior is influenced, meanwhile, the traffic space is occupied after the sign board is scraped down, and the traffic safety of the expressway is obviously influenced.
The current measures adopted for solving the problems are mainly to improve the strength of traffic sign materials so as to improve the wind resistance and arrange maintenance patrol cars for full line maintenance. The cost of improving the wind resistance of the traffic sign is high, the duration of typhoons is short in annual time, and the overall benefit is low; the full line maintenance and repair mode is low in efficiency, and the typhoon weather trip has a large potential safety hazard. Therefore, a new solution is needed in coastal areas of southeast to reduce the serious influence of typhoons on traffic signs and to improve traffic safety level.
Disclosure of Invention
In order to solve the technical problems, the invention provides an anti-typhoon traffic sign control method based on an intelligent lifting system.
The intelligent lifting system of the invention comprises: the system comprises a wireless transmission module, a controller, a meteorological sensor, a transmission module and a traffic sign board;
the wireless transmission module is connected with the controller in a wired mode; the meteorological sensor is connected with the controller in a wired mode; the transmission module is connected with the controller in a wired mode;
the wireless transmission module and the controller are both arranged on the ground where the traffic sign is located;
the weather sensor is arranged at the top of the traffic sign;
the transmission module is arranged at the back of the traffic sign board;
the transmission module includes: a movable shaft sleeve structure, a bearing seat structure and a fixed shaft sleeve structure;
the movable shaft sleeve structure is in interference fit with the bearing seat structure; the bearing seat structure and the fixed shaft sleeve structure are in interference fit;
the movable shaft sleeve structure is in clearance fit with the upright post; the bearing seat structure is in clearance fit with the upright post; the fixed shaft sleeve structure is in clearance fit with the upright post;
the bearing seat structure is connected with the traffic sign board by bolts;
a vertical wheel is arranged in the movable shaft sleeve structure; a vertical stepping motor is arranged in the movable shaft sleeve structure;
the vertical wheel is connected with the stepping motor by a key;
a transverse wheel is arranged in the bearing seat structure; a transverse stepping motor is arranged in the bearing seat structure;
the transverse wheel is connected with the transverse stepping motor by a key;
a vertical wheel is arranged in the shaft sleeve structure;
the technical scheme of the method is a typhoon-resistant traffic sign control method, which is characterized by comprising the following steps of:
step 1: a wireless transmission module and a controller are arranged on the ground where the traffic sign is located, a meteorological sensor is arranged at the top of the traffic sign, and a transmission module is arranged at the back of the traffic sign; the controller collects average wind speed data v in a certain time interval and average wind direction data theta in a certain time interval through a meteorological sensor; the controller receives signals of the expressway management center through the wireless transmission module, and optimally controls the traffic sign board according to the signals;
step 2: if the design wind speed is smaller than the average wind speed data, further optimizing the angle of the signpost and the height of the signpost through a simplex algorithm according to the maximum positive stress inequality constraint, the maximum shear stress inequality constraint, the dangerous point stress inequality constraint, the total deformation deflection inequality constraint, the rotation angle visibility constraint of the signpost, the height constraint of the road side guard rail and the feasibility constraint in a limit state by taking the maximum height of the signpost as an optimization target, so as to obtain the angle of the optimized signpost and the height of the optimized signpost;
step 3: and (3) taking the optimized angle and the optimized height of the signpost as targets, controlling the motor to rotate, and driving the signpost to lift and rotate to the calculated height and angle values.
Preferably, the signals of the highway management center in the step 1 are as follows:
wherein: state is a signal of the highway management center;
if state=0, the expressway is closed, the signpost loses functionality and can be lowered to the ground, and the step 3 is skipped;
if state=1 indicates that the expressway is open, the signpost needs to be adjusted by combining the real-time wind speed and the wind direction, and step 2 is performed.
θ n The angle value of the included angle between the traffic sign board and the direction of the vertical line of the road is;
h n the height value from the lower edge of the traffic sign to the ground is the height value;
h x the real-time height value from the lower edge of the traffic sign to the ground is obtained;
the average wind speed data v in step 1: an average value of wind speed data collected over a time interval;
the wind direction data θ in step 1: average value of included angle between wind direction collected in past certain time interval and direction of vertical line of road
The average wind speed data v and the wind direction data theta in the step 1 are transmitted to the controller from the meteorological sensor in a wired mode; other data are default parameters input in advance;
the design wind speed V in the step 1 0 : the maximum resistance wind speed is designed during the manufacturing of the signboards;
preferably, the maximum positive stress inequality constraint in step 2 is:
wherein: gamma ray 0 Is a structural importance coefficient; γq is a variable load component coefficient; c is the wind power coefficient; a is that 1 Is the area (m) 2 )；h 1 Is the length or diameter (m) of the sign; a is that 2 Is the cross-sectional area (m) of the upright post subjected to wind load 2 )；h 2 The distance from the wind load concentration point of the upright post to the bottom of the upright post; w is flexural section modulus (m 3 )；
The maximum shear stress inequality constraint in the step 2 is as follows:
γ 0 ·γ q ·ρ·C·v 2 [sin(θ-θ n ) 2 ·A 1 +A 2 ]÷π÷(D·t-t 2 )＜125
wherein: ρ is the air density (Nxs) 2 ×m -4 ) The method comprises the steps of carrying out a first treatment on the surface of the D is the diameter (m) of the cross section of the upright post; t is the wall thickness (m) of the upright post;
the dangerous point stress inequality constraint in the step 2 is as follows:
wherein: y is a dangerous point y coordinate value (m); s is S x Is the static moment (N/m); i is the section moment of inertia (m 4 )；
The total deformation deflection inequality constraint in the step 2 is as follows:
wherein: l is the height (m) of the upright post; e is the modulus of elasticity (MPa).
And 2, visually recognizing the rotation angle of the signpost, wherein the restriction is as follows:
0°≤θ n ≤θ t
in θ t The maximum rotation angle of the mark;
if the sign type is forbidden, indicating traffic sign, then theta t Taking 45 degrees;
if the sign type is warning and road indicating traffic sign, then theta t Taking 10 degrees;
step 2, the height constraint of the road side guard rail is as follows:
L-h n ≥h 0
in the method, in the process of the invention,h 0 is a road side guardrail height threshold;
and 2, when the feasibility constraint in the limit state is that the wind speed is too high and the constraint cannot be met, the signpost needs to be lowered to the road surface, namely:
h n ＝h x ，θ n ＝0
in the step 2, the maximum height of the signpost is used as an optimization target, and then an objective function is provided:
max h n
optimizing the angle and height of the signboards through a simplex algorithm, and outputting a result h n 、θ n ；
Preferably, the lifting process in step 3 is as follows:
in h n For the purpose, the stepping motor is controlled by the controller to rotate, and then the vertical wheel is driven to rotate through key connection, so that the transmission module and the connected signpost move to h along the vertical direction of the upright post n A height position;
the rotating process in the step 3 is as follows:
at theta n The stepping motor is controlled by the controller to rotate, and the transverse wheel is driven to rotate through key connection, so that the bearing seat structure and the connecting signpost rotate along the upright post to theta n Angle.
The vertical wheel plays an auxiliary supporting role and has no power.
Compared with the prior art, the system receives the signal of the expressway management center through the wireless module, monitors the wind speed and the wind direction in real time through the meteorological sensor, and finally triggers the transmission module to drive the traffic sign to rotate and lift so as to ensure the unification of the functionality, the visibility and the stability of the traffic sign in typhoon weather and improve the road traffic safety level; and determining proper rotation angle and lifting height values of the traffic sign by using a traffic sign visibility theory. The invention starts from the meteorological state of the typhoon weather of the expressway, can effectively adjust the visibility and stability of the traffic sign, and further improves the road traffic safety level. Compared with the method for improving the strength of traffic sign materials and arranging maintenance patrol cars for overhauling, the method has the advantages of small dependence on manpower, assemblability and dynamic change, and can improve the road traffic safety level of the expressway in typhoon weather to a certain extent.
Drawings
Fig. 1: an intelligent lifting typhoon-resistant single-column traffic sign control working principle for expressways.
Fig. 2: the method of the invention comprises the following steps.
Fig. 3: and (5) equipment layout indication.
Fig. 4: the transmission module is schematically structured.
The reference numerals in the drawings: 100 weather sensors; 200 transmission modules; 210 moving the sleeve structure; 211 vertical wheels; 212 a stepper motor; 220 bearing seat structure; 221 transverse wheels; a 222 step motor; 230 fixing the sleeve structure; 231 vertical wheels; 300 wireless transmission module; 400 controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the invention, as shown in fig. 1, 2 and 3, through the installed wireless transmission module, the controller receives information and data of the expressway management center and the meteorological sensor in a wireless and wired mode respectively, and determines the angle value and the height value of the signpost by combining a signpost visibility theory and a real-time wind direction and wind speed state, and triggers the transmission module to perform rotary lifting action.
The following describes a specific embodiment of the invention with reference to fig. 3 and 4 as a typhoon-resistant traffic sign control method based on an intelligent lifting system, which specifically comprises the following steps:
as shown in fig. 3, the intelligent lift system of the present invention includes: weather sensor 100, transmission module 200, wireless transmission module 300, controller 400;
the wireless transmission module 300 is connected with the controller 400 in a wired manner; the weather sensor 100 is connected with the controller 400 in a wired manner; the transmission module 200 is connected with the controller 400 in a wired manner;
the wireless transmission module 300 and the controller 400 are both arranged on the ground where the traffic sign is positioned;
the weather sensor 100 is installed on top of the traffic sign;
the transmission module 200 is installed at the back of the traffic sign;
the transmission module 200 includes: a moving sleeve structure 210, a bearing seat structure 220, a fixed sleeve structure 230;
the movable shaft sleeve structure 210 is in interference fit with the bearing seat structure 220; the bearing seat structure 220 and the fixed shaft sleeve structure 230 are in interference fit;
the movable shaft sleeve structure 210 is in clearance fit with the upright post; the bearing seat structure 220 is in clearance fit with the upright post; the fixed shaft sleeve structure 230 is in clearance fit with the upright post;
the bearing seat structure 220 is connected with the traffic sign plate by bolts;
a vertical wheel 211 is arranged in the movable shaft sleeve structure 210; a vertical stepper motor 212 is arranged in the movable shaft sleeve structure 210;
the vertical wheel 211 is connected with the stepping motor 212 by a key;
a transverse wheel 221 is arranged in the bearing seat structure 220; a transverse stepper motor 222 is arranged in the bearing seat structure 220;
the transverse wheel 221 is connected with the transverse stepping motor 222 by a key;
a vertical wheel 231 is arranged in the shaft sleeve structure 230;
the weather sensor 100 adopts an FRT FWS500Z weather sensor;
the controller 400 adopts an STM32 singlechip;
the wireless transmission module 300 adopts NB-IOT equipment of BC 95;
the stepping motor 211 and the stepping motor 212 are 57BYG250D type motors;
the technical scheme of the method is a typhoon-resistant traffic sign control method, which is characterized by comprising the following steps of:
step 1: a wireless transmission module 300 and a controller 400 are arranged on the ground where the traffic sign is located, a weather sensor 100 is arranged on the top of the traffic sign, and a transmission module 200 is arranged on the back of the traffic sign; the controller 400 collects average wind speed data v in a certain time interval and average wind direction data theta in a certain time interval through the meteorological sensor 100; the controller 400 receives signals of the expressway management center through the wireless transmission module 300, and optimally controls the traffic sign according to the signals;
preferably, the signals of the highway management center in the step 1 are as follows:
wherein: state is a signal of the highway management center;
if state=0, the expressway is closed, the signpost loses functionality and can be lowered to the ground, and the step 3 is skipped;
if state=1 indicates that the expressway is open, the signpost needs to be adjusted by combining the real-time wind speed and the wind direction, and step 2 is performed.
θ n The angle value of the included angle between the traffic sign board and the direction of the vertical line of the road is;
h n the height value from the lower edge of the traffic sign to the ground is the height value;
h x the real-time height value from the lower edge of the traffic sign to the ground is obtained;
the average wind speed data v in step 1: an average value of wind speed data collected over a time interval;
the wind direction data θ in step 1: average value of included angle between wind direction collected in past certain time interval and direction of vertical line of road
The average wind speed data v and the wind direction data θ in step 1 are transmitted from the meteorological sensor 100 to the controller 400 in a wired manner; other data are default parameters input in advance;
the design wind speed V in the step 1 0 : maximum resistance wind speed designed during manufacturing of signboards according to V 0 Design =35 m/s;
step 2: if the design wind speed is smaller than the average wind speed data, further optimizing the angle of the signpost and the height of the signpost through a simplex algorithm according to the maximum positive stress inequality constraint, the maximum shear stress inequality constraint, the dangerous point stress inequality constraint, the total deformation deflection inequality constraint, the rotation angle visibility constraint of the signpost, the height constraint of the road side guard rail and the feasibility constraint in a limit state by taking the maximum height of the signpost as an optimization target, so as to obtain the angle of the optimized signpost and the height of the optimized signpost;
preferably, the maximum positive stress inequality constraint in step 2 is:
wherein: gamma ray 0 As the structural importance coefficient, generally 0.9 is taken; gamma ray q For the variable load subitem coefficient, 1.4 is generally taken; c is the wind power coefficient, generally taking 1.2; a is that 1 Is the area (m) 2 ) According to the mark plate layout as a circle, A 1 Is 0.36 pi m 2 ；h 1 Taking 1.2m for the length or diameter (m) of the signpost; a is that 2 Is the cross-sectional area (m) of the upright post subjected to wind load 2 ) According to A 2 Is 0.434m 2 ；h 2 Taking 3.1m for the distance from the wind load concentration point of the upright post to the bottom of the upright post; w is flexural section modulus (m 3 ) Taking 6.287X10 -5 m 3 ；
The maximum shear stress inequality constraint in the step 2 is as follows:
γ 0 ·γ q ·ρ·C·v 2 [sin(θ-θ n ) 2 ·A 1 +A 2 ]÷π÷(D·t-t 2 )＜125
wherein: ρ is the air density (Nxs) 2 ×m -4 ) Generally 1.23; d is the diameter (m) of the cross section of the column, 1.916 multiplied by 10 -3 m 2 The method comprises the steps of carrying out a first treatment on the surface of the t is the wall thickness (m) of the upright post, and 0.0045m is taken;
the dangerous point stress inequality constraint in the step 2 is as follows:
wherein: y is a y coordinate value (m) of the dangerous point, and 0.04791m is taken; s is S x For the static moment (N/m), 2.9210979 ×10 is taken -5 N/m; i is the section moment of inertia (m 4 ) 4.4012 ×10 -6 m 4 ；
The total deformation deflection inequality constraint in the step 2 is as follows:
wherein: l is the height (m) of the upright post, and 3.1m is taken; e is elastic modulus (MPa) 206×10 9 MPa。
And 2, visually recognizing the rotation angle of the signpost, wherein the restriction is as follows:
0°≤θ n ≤θ t
in θ t The maximum rotation angle of the mark;
if the sign type is forbidden, indicating traffic sign, then theta t Taking 45 degrees;
if the sign type is warning and road indicating traffic sign, then theta t Taking 10 degrees;
step 2, the height constraint of the road side guard rail is as follows:
L-h n ≥h 0
in the formula, h 0 Is a road side guardrail height threshold;
and 2, when the feasibility constraint in the limit state is that the wind speed is too high and the constraint cannot be met, the signpost needs to be lowered to the road surface, namely:
h n ＝h x ，θ n ＝0
in the step 2, the maximum height of the signpost is used as an optimization target, and then an objective function is provided:
max h n
optimizing the angle and height of the signboards through a simplex algorithm, and outputting a result h n 、θ n ；
Step 3: and (3) taking the optimized angle and the optimized height of the signpost as targets, controlling the motor to rotate, and driving the signpost to lift and rotate to the calculated height and angle values.
The lifting process in the step 3 is as follows:
in h n To this end, the stepping motor 212 is controlled to rotate by the controller 400, and then the vertical wheel 211 is driven to rotate by the key connection, so that the driving module 200 and the connected signpost are moved to h along the vertical direction of the upright post n Height position, as shown in fig. 4;
the rotating process in the step 3 is as follows:
at theta n To achieve the goal, the controller 400 controls the stepping motor 222 to rotate, and then the key connection drives the transverse wheel 221 to rotate, so that the bearing seat structure 220 and the connecting signpost rotate along the upright post by an angle of theta n Angle, as shown in fig. 4.
The vertical wheels 231 serve as auxiliary supports and are not powered by themselves.
It will be readily understood by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or modifications made within the spirit and principles of the invention are intended to be included in the protection of the invention.
Claims (1)
1. A typhoon-resistant traffic sign control method based on an intelligent lifting system is characterized in that,
the intelligent lifting system comprises: the system comprises a wireless transmission module, a controller, a meteorological sensor, a transmission module and a traffic sign board;
the wireless transmission module is connected with the controller in a wired mode; the meteorological sensor is connected with the controller in a wired mode; the transmission module is connected with the controller in a wired mode;
the wireless transmission module and the controller are both arranged on the ground where the traffic sign is located;
the weather sensor is arranged at the top of the traffic sign;
the transmission module is arranged at the back of the traffic sign board;
the transmission module includes: a movable shaft sleeve structure, a bearing seat structure and a fixed shaft sleeve structure;
the movable shaft sleeve structure is in interference fit with the bearing seat structure; the bearing seat structure and the fixed shaft sleeve structure are in interference fit;
the movable shaft sleeve structure is in clearance fit with the upright post; the bearing seat structure is in clearance fit with the upright post; the fixed shaft sleeve structure is in clearance fit with the upright post;
the bearing seat structure is connected with the traffic sign board by bolts;
a vertical wheel is arranged in the movable shaft sleeve structure; a vertical stepping motor is arranged in the movable shaft sleeve structure;
the vertical wheel is connected with the stepping motor by a key;
a transverse wheel is arranged in the bearing seat structure; a transverse stepping motor is arranged in the bearing seat structure;
the transverse wheel is connected with the transverse stepping motor by a key;
a vertical wheel is arranged in the shaft sleeve structure;
the typhoon-resistant traffic sign control method comprises the following steps:
step 1: a wireless transmission module and a controller are arranged on the ground where the traffic sign is located, a meteorological sensor is arranged at the top of the traffic sign, and a transmission module is arranged at the back of the traffic sign; the controller collects average wind speed data v in a certain time interval and average wind direction data theta in a certain time interval through a meteorological sensor; the controller receives signals of the expressway management center through the wireless transmission module, and optimally controls the traffic sign board according to the signals;
step 2: if the design wind speed is smaller than the average wind speed data, further optimizing the angle of the signpost and the height of the signpost through a simplex algorithm according to the maximum positive stress inequality constraint, the maximum shear stress inequality constraint, the dangerous point stress inequality constraint, the total deformation deflection inequality constraint, the rotation angle visibility constraint of the signpost, the height constraint of the road side guard rail and the feasibility constraint in a limit state by taking the maximum height of the signpost as an optimization target, so as to obtain the angle of the optimized signpost and the height of the optimized signpost;
step 3: the optimized angle and the optimized height of the signpost are used as targets, and the motor is controlled to rotate so as to drive the signpost to lift and rotate to the calculated height and angle value;
the signals of the highway management center in the step 1 are as follows:
wherein: state is a signal of the highway management center;
if state=0, the expressway is closed, the signpost loses functionality and can be lowered to the ground, and the step 3 is skipped;
if state=1 indicates that the expressway is open, the signpost needs to be adjusted by combining the real-time wind speed and the wind direction, and step 2 is carried out;
θ n the angle value of the included angle between the traffic sign board and the direction of the vertical line of the road is;
h n the height value from the lower edge of the traffic sign to the ground is the height value;
h x the real-time height value from the lower edge of the traffic sign to the ground is obtained;
the average wind speed data v in step 1: an average value of wind speed data collected over a time interval;
the wind direction data θ in step 1: average value of included angle between wind direction collected in past certain time interval and direction of vertical line of road
The average wind speed data v and the wind direction data theta in the step 1 are transmitted to the controller from the meteorological sensor in a wired mode; other data are default parameters input in advance;
the design wind speed V in the step 1 0 : the maximum resistance wind speed is designed during the manufacturing of the signboards;
the maximum positive stress inequality constraint in the step 2 is as follows:
wherein: gamma ray 0 Is a structural importance coefficient; gamma ray q The load factor is variable; c is the wind power coefficient; a is that 1 Is the area (m) 2 )；h 1 Is the length or diameter (m) of the sign; a is that 2 Is the cross-sectional area (m) of the upright post subjected to wind load 2 )；h 2 The distance from the wind load concentration point of the upright post to the bottom of the upright post; w is flexural section modulus (m 3 )；
The maximum shear stress inequality constraint in the step 2 is as follows:
γ 0 ·γ q ·ρ·C·v 2 [sin(θ-θ n ) 2 ·A 1 +A 2 ]÷π÷(D·t-t 2 )<125
wherein: ρ is the air density (Nxs) 2 ×m -4 ) The method comprises the steps of carrying out a first treatment on the surface of the D is the diameter (m) of the cross section of the upright post; t is the wall thickness (m) of the upright post;
the dangerous point stress inequality constraint in the step 2 is as follows:
wherein: y is a dangerous point y coordinate value (m);S x is the static moment (N/m); i is the section moment of inertia (m 4 )；
The total deformation deflection inequality constraint in the step 2 is as follows:
wherein: l is the height (m) of the upright post; e is the elastic modulus (MPa);
and 2, visually recognizing the rotation angle of the signpost, wherein the restriction is as follows:
0°≤θ n ≤θ t
in θ t The maximum rotation angle of the mark;
if the sign type is forbidden, indicating traffic sign, then theta t Taking 45 degrees;
if the sign type is warning and road indicating traffic sign, then theta t Taking 10 degrees;
step 2, the height constraint of the road side guard rail is as follows:
L-h n ≥h 0
in the formula, h 0 Is a road side guardrail height threshold;
and 2, when the feasibility constraint in the limit state is that the wind speed is too high and the constraint cannot be met, the signpost needs to be lowered to the road surface, namely:
h n ＝h x ，θ n ＝0
in the step 2, the maximum height of the signpost is used as an optimization target, and then an objective function is provided:
max h n
optimizing the angle and height of the signboards through a simplex algorithm, and outputting a result h n 、θ n ；
The lifting process in the step 3 is as follows:
in h n For the purpose, the stepping motor is controlled by the controller to rotate, and then the vertical wheel is driven to rotate through key connection, so that the transmission module and the connected signpost move to h along the vertical direction of the upright post n A height position;
the rotating process in the step 3 is as follows:
at theta n The stepping motor is controlled by the controller to rotate, and the transverse wheel is driven to rotate through key connection, so that the bearing seat structure and the connecting signpost rotate along the upright post to theta n Angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110543352.1A CN113338189B (en) | 2021-05-19 | 2021-05-19 | Typhoon-resistant traffic sign control method based on intelligent lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110543352.1A CN113338189B (en) | 2021-05-19 | 2021-05-19 | Typhoon-resistant traffic sign control method based on intelligent lifting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113338189A CN113338189A (en) | 2021-09-03 |
| CN113338189B true CN113338189B (en) | 2024-04-09 |
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